1: # The LearningOnline Network with CAPA
2: # .helper XML handler to implement the LON-CAPA helper
3: #
4: # $Id: lonhelper.pm,v 1.129 2006/01/17 18:39:50 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28:
29: =pod
30:
31: =head1 NAME
32:
33: lonhelper - implements helper framework
34:
35: =head1 SYNOPSIS
36:
37: lonhelper implements the helper framework for LON-CAPA, and provides
38: many generally useful components for that framework.
39:
40: Helpers are little programs which present the user with a sequence of
41: simple choices, instead of one monolithic multi-dimensional
42: choice. They are also referred to as "wizards", "druids", and
43: other potentially trademarked or semantically-loaded words.
44:
45: =head1 OVERVIEWX<lonhelper>
46:
47: Helpers are well-established UI widgets that users
48: feel comfortable with. It can take a complicated multidimensional problem the
49: user has and turn it into a series of bite-sized one-dimensional questions.
50:
51: For developers, helpers provide an easy way to bundle little bits of functionality
52: for the user, without having to write the tedious state-maintenence code.
53:
54: Helpers are defined as XML documents, placed in the /home/httpd/html/adm/helpers
55: directory and having the .helper file extension. For examples, see that directory.
56:
57: All classes are in the Apache::lonhelper namespace.
58:
59: =head1 lonhelper XML file formatX<lonhelper, XML file format>
60:
61: A helper consists of a top-level <helper> tag which contains a series of states.
62: Each state contains one or more state elements, which are what the user sees, like
63: messages, resource selections, or date queries.
64:
65: The helper tag is required to have one attribute, "title", which is the name
66: of the helper itself, such as "Parameter helper". The helper tag may optionally
67: have a "requiredpriv" attribute, specifying the priviledge a user must have
68: to use the helper, or get denied access. See loncom/auth/rolesplain.tab for
69: useful privs. Default is full access, which is often wrong!
70:
71: =head2 State tags
72:
73: State tags are required to have an attribute "name", which is the symbolic
74: name of the state and will not be directly seen by the user. The helper is
75: required to have one state named "START", which is the state the helper
76: will start with. By convention, this state should clearly describe what
77: the helper will do for the user, and may also include the first information
78: entry the user needs to do for the helper.
79:
80: State tags are also required to have an attribute "title", which is the
81: human name of the state, and will be displayed as the header on top of
82: the screen for the user.
83:
84: =head2 Example Helper Skeleton
85:
86: An example of the tags so far:
87:
88: <helper title="Example Helper">
89: <state name="START" title="Demonstrating the Example Helper">
90: <!-- notice this is the START state the wizard requires -->
91: </state>
92: <state name="GET_NAME" title="Enter Student Name">
93: </state>
94: </helper>
95:
96: Of course this does nothing. In order for the wizard to do something, it is
97: necessary to put actual elements into the wizard. Documentation for each
98: of these elements follows.
99:
100: =head1 Creating a Helper With Code, Not XML
101:
102: In some situations, such as the printing wizard (see lonprintout.pm),
103: writing the helper in XML would be too complicated, because of scope
104: issues or the fact that the code actually outweighs the XML. It is
105: possible to create a helper via code, though it is a little odd.
106:
107: Creating a helper via code is more like issuing commands to create
108: a helper then normal code writing. For instance, elements will automatically
109: be added to the last state created, so it's important to create the
110: states in the correct order.
111:
112: First, create a new helper:
113:
114: use Apache::lonhelper;
115:
116: my $helper = Apache::lonhelper::new->("Helper Title");
117:
118: Next you'll need to manually add states to the helper:
119:
120: Apache::lonhelper::state->new("STATE_NAME", "State's Human Title");
121:
122: You don't need to save a reference to it because all elements up until
123: the next state creation will automatically be added to this state.
124:
125: Elements are created by populating the $paramHash in
126: Apache::lonhelper::paramhash. To prevent namespace issues, retrieve
127: a reference to that has with getParamHash:
128:
129: my $paramHash = Apache::lonhelper::getParamHash();
130:
131: You will need to do this for each state you create.
132:
133: Populate the $paramHash with the parameters for the element you wish
134: to add next; the easiest way to find out what those entries are is
135: to read the code. Some common ones are 'variable' to record the variable
136: to store the results in, and NEXTSTATE to record a next state transition.
137:
138: Then create your element:
139:
140: $paramHash->{MESSAGETEXT} = "This is a message.";
141: Apache::lonhelper::message->new();
142:
143: The creation will take the $paramHash and bless it into a
144: Apache::lonhelper::message object. To create the next element, you need
145: to get a reference to the new, empty $paramHash:
146:
147: $paramHash = Apache::lonhelper::getParamHash();
148:
149: and you can repeat creating elements that way. You can add states
150: and elements as needed.
151:
152: See lonprintout.pm, subroutine printHelper for an example of this, where
153: we dynamically add some states to prevent security problems, for instance.
154:
155: Normally the machinery in the XML format is sufficient; dynamically
156: adding states can easily be done by wrapping the state in a <condition>
157: tag. This should only be used when the code dominates the XML content,
158: the code is so complicated that it is difficult to get access to
159: all of the information you need because of scoping issues, or would-be <exec> or
160: <eval> blocks using the {DATA} mechanism results in hard-to-read
161: and -maintain code. (See course.initialization.helper for a borderline
162: case.)
163:
164: It is possible to do some of the work with an XML fragment parsed by
165: lonxml; again, see lonprintout.pm for an example. In that case it is
166: imperative that you call B<Apache::lonhelper::registerHelperTags()>
167: before parsing XML fragments and B<Apache::lonhelper::unregisterHelperTags()>
168: when you are done. See lonprintout.pm for examples of this usage in the
169: printHelper subroutine.
170:
171: =head2 Localization
172:
173: The helper framework tries to handle as much localization as
174: possible. The text is always run through
175: Apache::lonlocal::normalize_string, so be sure to run the keys through
176: that function for maximum usefulness and robustness.
177:
178: =cut
179:
180: package Apache::lonhelper;
181: use Apache::Constants qw(:common);
182: use Apache::File;
183: use Apache::lonxml;
184: use Apache::lonlocal;
185: use Apache::lonnet;
186:
187: # Register all the tags with the helper, so the helper can
188: # push and pop them
189:
190: my @helperTags;
191:
192: sub register {
193: my ($namespace, @tags) = @_;
194:
195: for my $tag (@tags) {
196: push @helperTags, [$namespace, $tag];
197: }
198: }
199:
200: BEGIN {
201: Apache::lonxml::register('Apache::lonhelper',
202: ('helper'));
203: register('Apache::lonhelper', ('state'));
204: }
205:
206: # Since all helpers are only three levels deep (helper tag, state tag,
207: # substate type), it's easier and more readble to explicitly track
208: # those three things directly, rather then futz with the tag stack
209: # every time.
210: my $helper;
211: my $state;
212: my $substate;
213: # To collect parameters, the contents of the subtags are collected
214: # into this paramHash, then passed to the element object when the
215: # end of the element tag is located.
216: my $paramHash;
217:
218: # Note from Jeremy 5-8-2003: It is *vital* that the real handler be called
219: # as a subroutine from the handler, or very mysterious things might happen.
220: # I don't know exactly why, but it seems that the scope where the Apache
221: # server enters the perl handler is treated differently from the rest of
222: # the handler. This also seems to manifest itself in the debugger as entering
223: # the perl handler in seemingly random places (sometimes it starts in the
224: # compiling phase, sometimes in the handler execution phase where it runs
225: # the code and stepping into the "1;" the module ends with goes into the handler,
226: # sometimes starting directly with the handler); I think the cause is related.
227: # In the debugger, this means that breakpoints are ignored until you step into
228: # a function and get out of what must be a "faked up scope" in the Apache->
229: # mod_perl connection. In this code, it was manifesting itself in the existence
230: # of two separate file-scoped $helper variables, one set to the value of the
231: # helper in the helper constructor, and one referenced by the handler on the
232: # "$helper->process()" line. Using the debugger, one could actually
233: # see the two different $helper variables, as hashes at completely
234: # different addresses. The second was therefore never set, and was still
235: # undefined when I tried to call process on it.
236: # By pushing the "real handler" down into the "real scope", everybody except the
237: # actual handler function directly below this comment gets the same $helper and
238: # everybody is happy.
239: # The upshot of all of this is that for safety when a handler is using
240: # file-scoped variables in LON-CAPA, the handler should be pushed down one
241: # call level, as I do here, to ensure that the top-level handler function does
242: # not get a different file scope from the rest of the code.
243: sub handler {
244: my $r = shift;
245: return real_handler($r);
246: }
247:
248: # For debugging purposes, one can send a second parameter into this
249: # function, the 'uri' of the helper you wish to have rendered, and
250: # call this from other handlers.
251: sub real_handler {
252: my $r = shift;
253: my $uri = shift;
254: if (!defined($uri)) { $uri = $r->uri(); }
255: $env{'request.uri'} = $uri;
256: my $filename = '/home/httpd/html' . $uri;
257: my $fh = Apache::File->new($filename);
258: my $file;
259: read $fh, $file, 100000000;
260:
261:
262: # Send header, don't cache this page
263: if ($env{'browser.mathml'}) {
264: &Apache::loncommon::content_type($r,'text/xml');
265: } else {
266: &Apache::loncommon::content_type($r,'text/html');
267: }
268: $r->send_http_header;
269: return OK if $r->header_only;
270: $r->rflush();
271:
272: # Discard result, we just want the objects that get created by the
273: # xml parsing
274: &Apache::lonxml::xmlparse($r, 'helper', $file);
275:
276: my $allowed = $helper->allowedCheck();
277: if (!$allowed) {
278: $env{'user.error.msg'} = $env{'request.uri'}.':'.$helper->{REQUIRED_PRIV}.
279: ":0:0:Permission denied to access this helper.";
280: return HTTP_NOT_ACCEPTABLE;
281: }
282:
283: $helper->process();
284:
285: $r->print($helper->display());
286: return OK;
287: }
288:
289: sub registerHelperTags {
290: for my $tagList (@helperTags) {
291: Apache::lonxml::register($tagList->[0], $tagList->[1]);
292: }
293: }
294:
295: sub unregisterHelperTags {
296: for my $tagList (@helperTags) {
297: Apache::lonxml::deregister($tagList->[0], $tagList->[1]);
298: }
299: }
300:
301: sub start_helper {
302: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
303:
304: if ($target ne 'helper') {
305: return '';
306: }
307:
308: registerHelperTags();
309:
310: Apache::lonhelper::helper->new($token->[2]{'title'}, $token->[2]{'requiredpriv'});
311: return '';
312: }
313:
314: sub end_helper {
315: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
316:
317: if ($target ne 'helper') {
318: return '';
319: }
320:
321: unregisterHelperTags();
322:
323: return '';
324: }
325:
326: sub start_state {
327: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
328:
329: if ($target ne 'helper') {
330: return '';
331: }
332:
333: Apache::lonhelper::state->new($token->[2]{'name'},
334: $token->[2]{'title'});
335: return '';
336: }
337:
338: # Use this to get the param hash from other files.
339: sub getParamHash {
340: return $paramHash;
341: }
342:
343: # Use this to get the helper, if implementing elements in other files
344: # (like lonprintout.pm)
345: sub getHelper {
346: return $helper;
347: }
348:
349: # don't need this, so ignore it
350: sub end_state {
351: return '';
352: }
353:
354: 1;
355:
356: package Apache::lonhelper::helper;
357:
358: use Digest::MD5 qw(md5_hex);
359: use HTML::Entities();
360: use Apache::loncommon;
361: use Apache::File;
362: use Apache::lonlocal;
363: use Apache::lonnet;
364:
365: sub new {
366: my $proto = shift;
367: my $class = ref($proto) || $proto;
368: my $self = {};
369:
370: $self->{TITLE} = shift;
371: $self->{REQUIRED_PRIV} = shift;
372:
373: # If there is a state from the previous form, use that. If there is no
374: # state, use the start state parameter.
375: if (defined $env{"form.CURRENT_STATE"})
376: {
377: $self->{STATE} = $env{"form.CURRENT_STATE"};
378: }
379: else
380: {
381: $self->{STATE} = "START";
382: }
383:
384: $self->{TOKEN} = $env{'form.TOKEN'};
385: # If a token was passed, we load that in. Otherwise, we need to create a
386: # new storage file
387: # Tried to use standard Tie'd hashes, but you can't seem to take a
388: # reference to a tied hash and write to it. I'd call that a wart.
389: if ($self->{TOKEN}) {
390: # Validate the token before trusting it
391: if ($self->{TOKEN} !~ /^[a-f0-9]{32}$/) {
392: # Not legit. Return nothing and let all hell break loose.
393: # User shouldn't be doing that!
394: return undef;
395: }
396:
397: # Get the hash.
398: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN}); # Note the token is not the literal file
399:
400: my $file = Apache::File->new($self->{FILENAME});
401: my $contents = <$file>;
402:
403: # Now load in the contents
404: for my $value (split (/&/, $contents)) {
405: my ($name, $value) = split(/=/, $value);
406: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
407: $self->{VARS}->{$name} = $value;
408: }
409:
410: $file->close();
411: } else {
412: # Only valid if we're just starting.
413: if ($self->{STATE} ne 'START') {
414: return undef;
415: }
416: # Must create the storage
417: $self->{TOKEN} = md5_hex($env{'user.name'} . $env{'user.domain'} .
418: time() . rand());
419: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN});
420: }
421:
422: # OK, we now have our persistent storage.
423:
424: if (defined $env{"form.RETURN_PAGE"})
425: {
426: $self->{RETURN_PAGE} = $env{"form.RETURN_PAGE"};
427: }
428: else
429: {
430: $self->{RETURN_PAGE} = $ENV{REFERER};
431: }
432:
433: $self->{STATES} = {};
434: $self->{DONE} = 0;
435:
436: # Used by various helpers for various things; see lonparm.helper
437: # for an example.
438: $self->{DATA} = {};
439:
440: $helper = $self;
441:
442: # Establish the $paramHash
443: $paramHash = {};
444:
445: bless($self, $class);
446: return $self;
447: }
448:
449: # Private function; returns a string to construct the hidden fields
450: # necessary to have the helper track state.
451: sub _saveVars {
452: my $self = shift;
453: my $result = "";
454: $result .= '<input type="hidden" name="CURRENT_STATE" value="' .
455: HTML::Entities::encode($self->{STATE},'<>&"') . "\" />\n";
456: $result .= '<input type="hidden" name="TOKEN" value="' .
457: $self->{TOKEN} . "\" />\n";
458: $result .= '<input type="hidden" name="RETURN_PAGE" value="' .
459: HTML::Entities::encode($self->{RETURN_PAGE},'<>&"') . "\" />\n";
460:
461: return $result;
462: }
463:
464: # Private function: Create the querystring-like representation of the stored
465: # data to write to disk.
466: sub _varsInFile {
467: my $self = shift;
468: my @vars = ();
469: for my $key (keys %{$self->{VARS}}) {
470: push @vars, &Apache::lonnet::escape($key) . '=' .
471: &Apache::lonnet::escape($self->{VARS}->{$key});
472: }
473: return join ('&', @vars);
474: }
475:
476: # Use this to declare variables.
477: # FIXME: Document this
478: sub declareVar {
479: my $self = shift;
480: my $var = shift;
481:
482: if (!defined($self->{VARS}->{$var})) {
483: $self->{VARS}->{$var} = '';
484: }
485:
486: my $envname = 'form.' . $var . '.forminput';
487: if (defined($env{$envname})) {
488: if (ref($env{$envname})) {
489: $self->{VARS}->{$var} = join('|||', @{$env{$envname}});
490: } else {
491: $self->{VARS}->{$var} = $env{$envname};
492: }
493: }
494: }
495:
496: sub allowedCheck {
497: my $self = shift;
498:
499: if (!defined($self->{REQUIRED_PRIV})) {
500: return 1;
501: }
502:
503: return Apache::lonnet::allowed($self->{REQUIRED_PRIV}, $env{'request.course.id'});
504: }
505:
506: sub changeState {
507: my $self = shift;
508: $self->{STATE} = shift;
509: }
510:
511: sub registerState {
512: my $self = shift;
513: my $state = shift;
514:
515: my $stateName = $state->name();
516: $self->{STATES}{$stateName} = $state;
517: }
518:
519: sub process {
520: my $self = shift;
521:
522: # Phase 1: Post processing for state of previous screen (which is actually
523: # the "current state" in terms of the helper variables), if it wasn't the
524: # beginning state.
525: if ($self->{STATE} ne "START" || $env{"form.SUBMIT"} eq &mt("Next ->")) {
526: my $prevState = $self->{STATES}{$self->{STATE}};
527: $prevState->postprocess();
528: }
529:
530: # Note, to handle errors in a state's input that a user must correct,
531: # do not transition in the postprocess, and force the user to correct
532: # the error.
533:
534: # Phase 2: Preprocess current state
535: my $startState = $self->{STATE};
536: my $state = $self->{STATES}->{$startState};
537:
538: # For debugging, print something here to determine if you're going
539: # to an undefined state.
540: if (!defined($state)) {
541: return;
542: }
543: $state->preprocess();
544:
545: # Phase 3: While the current state is different from the previous state,
546: # keep processing.
547: while ( $startState ne $self->{STATE} &&
548: defined($self->{STATES}->{$self->{STATE}}) )
549: {
550: $startState = $self->{STATE};
551: $state = $self->{STATES}->{$startState};
552: $state->preprocess();
553: }
554:
555: return;
556: }
557:
558: # 1: Do the post processing for the previous state.
559: # 2: Do the preprocessing for the current state.
560: # 3: Check to see if state changed, if so, postprocess current and move to next.
561: # Repeat until state stays stable.
562: # 4: Render the current state to the screen as an HTML page.
563: sub display {
564: my $self = shift;
565:
566: my $state = $self->{STATES}{$self->{STATE}};
567:
568: my $result = "";
569:
570: if (!defined($state)) {
571: $result = "<font color='#ff0000'>Error: state '$state' not defined!</font>";
572: return $result;
573: }
574:
575: # Phase 4: Display.
576: my $html=&Apache::lonxml::xmlbegin();
577: my $stateTitle=&mt($state->title());
578: my $helperTitle = &mt($self->{TITLE});
579: my $browser_searcher_js = &Apache::loncommon::browser_and_searcher_javascript();
580: my $bodytag = &Apache::loncommon::bodytag($helperTitle,'','');
581: my $previous = HTML::Entities::encode(&mt("<- Previous"), '<>&"');
582: my $next = HTML::Entities::encode(&mt("Next ->"), '<>&"');
583: # FIXME: This should be parameterized, not concatenated - Jeremy
584: my $loncapaHelper = &mt("LON-CAPA Helper:");
585:
586: $result .= <<HEADER;
587: $html
588: <head>
589: <title>$loncapaHelper: $helperTitle</title>
590: <script type="text/javascript">
591: $browser_searcher_js
592: </script>
593: </head>
594: $bodytag
595: HEADER
596: if (!$state->overrideForm()) { $result.="<form name='helpform' method='POST'>"; }
597: $result .= <<HEADER;
598: <table border="0" width='100%'><tr><td>
599: <h2><i>$stateTitle</i></h2>
600: HEADER
601:
602: $result .= "<table cellpadding='10' width='100%'><tr><td rowspan='2' valign='top'>";
603:
604: if (!$state->overrideForm()) {
605: $result .= $self->_saveVars();
606: }
607: $result .= $state->render();
608:
609: $result .= "</td><td valign='top' align='right'>";
610:
611: # Warning: Copy and pasted from below, because it's too much trouble to
612: # turn this into a subroutine
613: if (!$state->overrideForm()) {
614: if ($self->{STATE} ne $self->{START_STATE}) {
615: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
616: }
617: if ($self->{DONE}) {
618: my $returnPage = $self->{RETURN_PAGE};
619: $result .= "<a href=\"$returnPage\">" . &mt("End Helper") . "</a>";
620: }
621: else {
622: $result .= '<nobr><input name="back" type="button" ';
623: $result .= 'value="' . $previous . '" onclick="history.go(-1)" /> ';
624: $result .= '<input name="SUBMIT" type="submit" value="' . $next . '" /></nobr>';
625: }
626: }
627:
628: $result .= "</td></tr><tr><td valign='bottom' align='right'>";
629:
630: # Warning: Copy and pasted from above, because it's too much trouble to
631: # turn this into a subroutine
632: if (!$state->overrideForm()) {
633: if ($self->{STATE} ne $self->{START_STATE}) {
634: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
635: }
636: if ($self->{DONE}) {
637: my $returnPage = $self->{RETURN_PAGE};
638: $result .= "<a href=\"$returnPage\">" . &mt('End Helper') . "</a>";
639: }
640: else {
641: $result .= '<nobr><input name="back" type="button" ';
642: $result .= 'value="' . $previous . '" onclick="history.go(-1)" /> ';
643: $result .= '<input name="SUBMIT" type="submit" value="' . $next . '" /></nobr>';
644: }
645: }
646:
647: #foreach my $key (keys %{$self->{VARS}}) {
648: # $result .= "|$key| -> " . $self->{VARS}->{$key} . "<br />";
649: #}
650:
651: $result .= "</td></tr></table>";
652:
653: $result .= <<FOOTER;
654: </td>
655: </tr>
656: </table>
657: </form>
658: </body>
659: </html>
660: FOOTER
661:
662: # Handle writing out the vars to the file
663: my $file = Apache::File->new('>'.$self->{FILENAME});
664: print $file $self->_varsInFile();
665:
666: return $result;
667: }
668:
669: 1;
670:
671: package Apache::lonhelper::state;
672:
673: # States bundle things together and are responsible for compositing the
674: # various elements together. It is not generally necessary for users to
675: # use the state object directly, so it is not perldoc'ed.
676:
677: # Basically, all the states do is pass calls to the elements and aggregate
678: # the results.
679:
680: sub new {
681: my $proto = shift;
682: my $class = ref($proto) || $proto;
683: my $self = {};
684:
685: $self->{NAME} = shift;
686: $self->{TITLE} = shift;
687: $self->{ELEMENTS} = [];
688:
689: bless($self, $class);
690:
691: $helper->registerState($self);
692:
693: $state = $self;
694:
695: return $self;
696: }
697:
698: sub name {
699: my $self = shift;
700: return $self->{NAME};
701: }
702:
703: sub title {
704: my $self = shift;
705: return $self->{TITLE};
706: }
707:
708: sub preprocess {
709: my $self = shift;
710: for my $element (@{$self->{ELEMENTS}}) {
711: $element->preprocess();
712: }
713: }
714:
715: # FIXME: Document that all postprocesses must return a true value or
716: # the state transition will be overridden
717: sub postprocess {
718: my $self = shift;
719:
720: # Save the state so we can roll it back if we need to.
721: my $originalState = $helper->{STATE};
722: my $everythingSuccessful = 1;
723:
724: for my $element (@{$self->{ELEMENTS}}) {
725: my $result = $element->postprocess();
726: if (!$result) { $everythingSuccessful = 0; }
727: }
728:
729: # If not all the postprocesses were successful, override
730: # any state transitions that may have occurred. It is the
731: # responsibility of the states to make sure they have
732: # error handling in that case.
733: if (!$everythingSuccessful) {
734: $helper->{STATE} = $originalState;
735: }
736: }
737:
738: # Override the form if any element wants to.
739: # two elements overriding the form will make a mess, but that should
740: # be considered helper author error ;-)
741: sub overrideForm {
742: my $self = shift;
743: for my $element (@{$self->{ELEMENTS}}) {
744: if ($element->overrideForm()) {
745: return 1;
746: }
747: }
748: return 0;
749: }
750:
751: sub addElement {
752: my $self = shift;
753: my $element = shift;
754:
755: push @{$self->{ELEMENTS}}, $element;
756: }
757:
758: sub render {
759: my $self = shift;
760: my @results = ();
761:
762: for my $element (@{$self->{ELEMENTS}}) {
763: push @results, $element->render();
764: }
765:
766: return join("\n", @results);
767: }
768:
769: 1;
770:
771: package Apache::lonhelper::element;
772: # Support code for elements
773:
774: =pod
775:
776: =head1 Element Base Class
777:
778: The Apache::lonhelper::element base class provides support for elements
779: and defines some generally useful tags for use in elements.
780:
781: =head2 finalcode tagX<finalcode>
782:
783: Each element can contain a "finalcode" tag that, when the special FINAL
784: helper state is used, will be executed, surrounded by "sub { my $helper = shift;"
785: and "}". It is expected to return a string describing what it did, which
786: may be an empty string. See course initialization helper for an example. This is
787: generally intended for helpers like the course initialization helper, which consist
788: of several panels, each of which is performing some sort of bite-sized functionality.
789:
790: =head2 defaultvalue tagX<defaultvalue>
791:
792: Each element that accepts user input can contain a "defaultvalue" tag that,
793: when surrounded by "sub { my $helper = shift; my $state = shift; " and "}",
794: will form a subroutine that when called will provide a default value for
795: the element. How this value is interpreted by the element is specific to
796: the element itself, and possibly the settings the element has (such as
797: multichoice vs. single choice for <choices> tags).
798:
799: This is also intended for things like the course initialization wizard, where the
800: user is setting various parameters. By correctly grabbing current settings
801: and including them into the helper, it allows the user to come back to the
802: helper later and re-execute it, without needing to worry about overwriting
803: some setting accidentally.
804:
805: Again, see the course initialization helper for examples.
806:
807: =head2 validator tagX<validator>
808:
809: Some elements that accepts user input can contain a "validator" tag that,
810: when surrounded by "sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift "
811: and "}", where "$val" is the value the user entered, will form a subroutine
812: that when called will verify whether the given input is valid or not. If it
813: is valid, the routine will return a false value. If invalid, the routine
814: will return an error message to be displayed for the user.
815:
816: Consult the documentation for each element to see whether it supports this
817: tag.
818:
819: =head2 getValue methodX<getValue (helper elements)>
820:
821: If the element stores the name of the variable in a 'variable' member, which
822: the provided ones all do, you can retreive the value of the variable by calling
823: this method.
824:
825: =cut
826:
827: BEGIN {
828: &Apache::lonhelper::register('Apache::lonhelper::element',
829: ('nextstate', 'finalcode',
830: 'defaultvalue', 'validator'));
831: }
832:
833: # Because we use the param hash, this is often a sufficent
834: # constructor
835: sub new {
836: my $proto = shift;
837: my $class = ref($proto) || $proto;
838: my $self = $paramHash;
839: bless($self, $class);
840:
841: $self->{PARAMS} = $paramHash;
842: $self->{STATE} = $state;
843: $state->addElement($self);
844:
845: # Ensure param hash is not reused
846: $paramHash = {};
847:
848: return $self;
849: }
850:
851: sub start_nextstate {
852: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
853:
854: if ($target ne 'helper') {
855: return '';
856: }
857:
858: $paramHash->{NEXTSTATE} = &Apache::lonxml::get_all_text('/nextstate',
859: $parser);
860: return '';
861: }
862:
863: sub end_nextstate { return ''; }
864:
865: sub start_finalcode {
866: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
867:
868: if ($target ne 'helper') {
869: return '';
870: }
871:
872: $paramHash->{FINAL_CODE} = &Apache::lonxml::get_all_text('/finalcode',
873: $parser);
874: return '';
875: }
876:
877: sub end_finalcode { return ''; }
878:
879: sub start_defaultvalue {
880: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
881:
882: if ($target ne 'helper') {
883: return '';
884: }
885:
886: $paramHash->{DEFAULT_VALUE} = &Apache::lonxml::get_all_text('/defaultvalue',
887: $parser);
888: $paramHash->{DEFAULT_VALUE} = 'sub { my $helper = shift; my $state = shift;' .
889: $paramHash->{DEFAULT_VALUE} . '}';
890: return '';
891: }
892:
893: sub end_defaultvalue { return ''; }
894:
895: # Validators may need to take language specifications
896: sub start_validator {
897: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
898:
899: if ($target ne 'helper') {
900: return '';
901: }
902:
903: $paramHash->{VALIDATOR} = &Apache::lonxml::get_all_text('/validator',
904: $parser);
905: $paramHash->{VALIDATOR} = 'sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift;' .
906: $paramHash->{VALIDATOR} . '}';
907: return '';
908: }
909:
910: sub end_validator { return ''; }
911:
912: sub preprocess {
913: return 1;
914: }
915:
916: sub postprocess {
917: return 1;
918: }
919:
920: sub render {
921: return '';
922: }
923:
924: sub overrideForm {
925: return 0;
926: }
927:
928: sub getValue {
929: my $self = shift;
930: return $helper->{VARS}->{$self->{'variable'}};
931: }
932:
933: 1;
934:
935: package Apache::lonhelper::message;
936:
937: =pod
938:
939: =head1 Elements
940:
941: =head2 Element: messageX<message, helper element>
942:
943: Message elements display their contents, and
944: transition directly to the state in the <nextstate> attribute. Example:
945:
946: <message nextstate='GET_NAME'>
947: This is the <b>message</b> the user will see,
948: <i>HTML allowed</i>.
949: </message>
950:
951: This will display the HTML message and transition to the 'nextstate' if
952: given. The HTML will be directly inserted into the helper, so if you don't
953: want text to run together, you'll need to manually wrap the message text
954: in <p> tags, or whatever is appropriate for your HTML.
955:
956: Message tags do not add in whitespace, so if you want it, you'll need to add
957: it into states. This is done so you can inline some elements, such as
958: the <date> element, right between two messages, giving the appearence that
959: the <date> element appears inline. (Note the elements can not be embedded
960: within each other.)
961:
962: This is also a good template for creating your own new states, as it has
963: very little code beyond the state template.
964:
965: =head3 Localization
966:
967: The contents of the message tag will be run through the
968: normalize_string function and that will be used as a call to &mt.
969:
970: =cut
971:
972: no strict;
973: @ISA = ("Apache::lonhelper::element");
974: use strict;
975: use Apache::lonlocal;
976:
977: BEGIN {
978: &Apache::lonhelper::register('Apache::lonhelper::message',
979: ('message'));
980: }
981:
982: sub new {
983: my $ref = Apache::lonhelper::element->new();
984: bless($ref);
985: }
986:
987: # CONSTRUCTION: Construct the message element from the XML
988: sub start_message {
989: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
990:
991: if ($target ne 'helper') {
992: return '';
993: }
994:
995: $paramHash->{MESSAGE_TEXT} = &mtn(&Apache::lonxml::get_all_text('/message',
996: $parser));
997:
998: if (defined($token->[2]{'nextstate'})) {
999: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
1000: }
1001: return '';
1002: }
1003:
1004: sub end_message {
1005: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1006:
1007: if ($target ne 'helper') {
1008: return '';
1009: }
1010: Apache::lonhelper::message->new();
1011: return '';
1012: }
1013:
1014: sub render {
1015: my $self = shift;
1016:
1017: return &mtn($self->{MESSAGE_TEXT});
1018: }
1019: # If a NEXTSTATE was given, switch to it
1020: sub postprocess {
1021: my $self = shift;
1022: if (defined($self->{NEXTSTATE})) {
1023: $helper->changeState($self->{NEXTSTATE});
1024: }
1025:
1026: return 1;
1027: }
1028: 1;
1029:
1030: package Apache::lonhelper::choices;
1031:
1032: =pod
1033:
1034: =head2 Element: choicesX<choices, helper element>
1035:
1036: Choice states provide a single choice to the user as a text selection box.
1037: A "choice" is two pieces of text, one which will be displayed to the user
1038: (the "human" value), and one which will be passed back to the program
1039: (the "computer" value). For instance, a human may choose from a list of
1040: resources on disk by title, while your program wants the file name.
1041:
1042: <choices> takes an attribute "variable" to control which helper variable
1043: the result is stored in.
1044:
1045: <choices> takes an attribute "multichoice" which, if set to a true
1046: value, will allow the user to select multiple choices.
1047:
1048: <choices> takes an attribute "allowempty" which, if set to a true
1049: value, will allow the user to select none of the choices without raising
1050: an error message.
1051:
1052: =head3 SUB-TAGS
1053:
1054: <choices> can have the following subtags:X<choice, helper tag>
1055:
1056: =over 4
1057:
1058: =item * <nextstate>state_name</nextstate>: If given, this will cause the
1059: choice element to transition to the given state after executing.
1060: This will override the <nextstate> passed to <choices> (if any).
1061:
1062: =item * <choice />: If the choices are static,
1063: this element will allow you to specify them. Each choice
1064: contains attribute, "computer", as described above. The
1065: content of the tag will be used as the human label.
1066: For example,
1067: <choice computer='234-12-7312'>Bobby McDormik</choice>.
1068:
1069: <choice> can take a parameter "eval", which if set to
1070: a true value, will cause the contents of the tag to be
1071: evaluated as it would be in an <eval> tag; see <eval> tag
1072: below.
1073:
1074: <choice> may optionally contain a 'nextstate' attribute, which
1075: will be the state transistioned to if the choice is made, if
1076: the choice is not multichoice. This will override the nextstate
1077: passed to the parent C<choices> tag.
1078:
1079: =back
1080:
1081: To create the choices programmatically, either wrap the choices in
1082: <condition> tags (prefered), or use an <exec> block inside the <choice>
1083: tag. Store the choices in $state->{CHOICES}, which is a list of list
1084: references, where each list has three strings. The first is the human
1085: name, the second is the computer name. and the third is the option
1086: next state. For example:
1087:
1088: <exec>
1089: for (my $i = 65; $i < 65 + 26; $i++) {
1090: push @{$state->{CHOICES}}, [chr($i), $i, 'next'];
1091: }
1092: </exec>
1093:
1094: This will allow the user to select from the letters A-Z (in ASCII), while
1095: passing the ASCII value back into the helper variables, and the state
1096: will in all cases transition to 'next'.
1097:
1098: You can mix and match methods of creating choices, as long as you always
1099: "push" onto the choice list, rather then wiping it out. (You can even
1100: remove choices programmatically, but that would probably be bad form.)
1101:
1102: =head3 defaultvalue support
1103:
1104: Choices supports default values both in multichoice and single choice mode.
1105: In single choice mode, have the defaultvalue tag's function return the
1106: computer value of the box you want checked. If the function returns a value
1107: that does not correspond to any of the choices, the default behavior of selecting
1108: the first choice will be preserved.
1109:
1110: For multichoice, return a string with the computer values you want checked,
1111: delimited by triple pipes. Note this matches how the result of the <choices>
1112: tag is stored in the {VARS} hash.
1113:
1114: =cut
1115:
1116: no strict;
1117: @ISA = ("Apache::lonhelper::element");
1118: use strict;
1119: use Apache::lonlocal;
1120: use Apache::lonnet;
1121:
1122: BEGIN {
1123: &Apache::lonhelper::register('Apache::lonhelper::choices',
1124: ('choice', 'choices'));
1125: }
1126:
1127: sub new {
1128: my $ref = Apache::lonhelper::element->new();
1129: bless($ref);
1130: }
1131:
1132: # CONSTRUCTION: Construct the message element from the XML
1133: sub start_choices {
1134: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1135:
1136: if ($target ne 'helper') {
1137: return '';
1138: }
1139:
1140: # Need to initialize the choices list, so everything can assume it exists
1141: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1142: $helper->declareVar($paramHash->{'variable'});
1143: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1144: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
1145: $paramHash->{CHOICES} = [];
1146: return '';
1147: }
1148:
1149: sub end_choices {
1150: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1151:
1152: if ($target ne 'helper') {
1153: return '';
1154: }
1155: Apache::lonhelper::choices->new();
1156: return '';
1157: }
1158:
1159: sub start_choice {
1160: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1161:
1162: if ($target ne 'helper') {
1163: return '';
1164: }
1165:
1166: my $computer = $token->[2]{'computer'};
1167: my $human = &mt(&Apache::lonxml::get_all_text('/choice',
1168: $parser));
1169: my $nextstate = $token->[2]{'nextstate'};
1170: my $evalFlag = $token->[2]{'eval'};
1171: push @{$paramHash->{CHOICES}}, [&mtn($human), $computer, $nextstate,
1172: $evalFlag];
1173: return '';
1174: }
1175:
1176: sub end_choice {
1177: return '';
1178: }
1179:
1180: {
1181: # used to generate unique id attributes for <input> tags.
1182: # internal use only.
1183: my $id = 0;
1184: sub new_id { return $id++; }
1185: }
1186:
1187: sub render {
1188: my $self = shift;
1189: my $var = $self->{'variable'};
1190: my $buttons = '';
1191: my $result = '';
1192:
1193: if ($self->{'multichoice'}) {
1194: $result .= <<SCRIPT;
1195: <script type="text/javascript">
1196: // <!--
1197: function checkall(value, checkName) {
1198: for (i=0; i<document.forms.helpform.elements.length; i++) {
1199: ele = document.forms.helpform.elements[i];
1200: if (ele.name == checkName + '.forminput') {
1201: document.forms.helpform.elements[i].checked=value;
1202: }
1203: }
1204: }
1205: // -->
1206: </script>
1207: SCRIPT
1208: }
1209:
1210: # Only print "select all" and "unselect all" if there are five or
1211: # more choices; fewer then that and it looks silly.
1212: if ($self->{'multichoice'} && scalar(@{$self->{CHOICES}}) > 4) {
1213: my %lt=&Apache::lonlocal::texthash(
1214: 'sa' => "Select All",
1215: 'ua' => "Unselect All");
1216: $buttons = <<BUTTONS;
1217: <br />
1218: <input type="button" onclick="checkall(true, '$var')" value="$lt{'sa'}" />
1219: <input type="button" onclick="checkall(false, '$var')" value="$lt{'ua'}" />
1220: <br />
1221: BUTTONS
1222: }
1223:
1224: if (defined $self->{ERROR_MSG}) {
1225: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1226: }
1227:
1228: $result .= $buttons;
1229:
1230: $result .= "<table>\n\n";
1231:
1232: my %checkedChoices;
1233: my $checkedChoicesFunc;
1234:
1235: if (defined($self->{DEFAULT_VALUE})) {
1236: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1237: die 'Error in default value code for variable ' .
1238: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1239: } else {
1240: $checkedChoicesFunc = sub { return ''; };
1241: }
1242:
1243: # Process which choices should be checked.
1244: if ($self->{'multichoice'}) {
1245: for my $selectedChoice (split(/\|\|\|/, (&$checkedChoicesFunc($helper, $self)))) {
1246: $checkedChoices{$selectedChoice} = 1;
1247: }
1248: } else {
1249: # single choice
1250: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1251:
1252: my $foundChoice = 0;
1253:
1254: # check that the choice is in the list of choices.
1255: for my $choice (@{$self->{CHOICES}}) {
1256: if ($choice->[1] eq $selectedChoice) {
1257: $checkedChoices{$choice->[1]} = 1;
1258: $foundChoice = 1;
1259: }
1260: }
1261:
1262: # If we couldn't find the choice, pick the first one
1263: if (!$foundChoice) {
1264: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1265: }
1266: }
1267:
1268: my $type = "radio";
1269: if ($self->{'multichoice'}) { $type = 'checkbox'; }
1270: foreach my $choice (@{$self->{CHOICES}}) {
1271: my $id = &new_id();
1272: $result .= "<tr>\n<td width='20'> </td>\n";
1273: $result .= "<td valign='top'><input type='$type' name='$var.forminput'"
1274: . " value='" .
1275: HTML::Entities::encode($choice->[1],"<>&\"'")
1276: . "'";
1277: if ($checkedChoices{$choice->[1]}) {
1278: $result .= " checked='checked' ";
1279: }
1280: $result .= qq{id="id$id"};
1281: my $choiceLabel = $choice->[0];
1282: if ($choice->[4]) { # if we need to evaluate this choice
1283: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1284: $choiceLabel . "}";
1285: $choiceLabel = eval($choiceLabel);
1286: $choiceLabel = &$choiceLabel($helper, $self);
1287: }
1288: $result .= "/></td><td> ".qq{<label for="id$id">}.
1289: $choiceLabel. "</label></td></tr>\n";
1290: }
1291: $result .= "</table>\n\n\n";
1292: $result .= $buttons;
1293:
1294: return $result;
1295: }
1296:
1297: # If a NEXTSTATE was given or a nextstate for this choice was
1298: # given, switch to it
1299: sub postprocess {
1300: my $self = shift;
1301: my $chosenValue = $env{'form.' . $self->{'variable'} . '.forminput'};
1302:
1303: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1304: $self->{ERROR_MSG} =
1305: &mt("You must choose one or more choices to continue.");
1306: return 0;
1307: }
1308:
1309: if (ref($chosenValue)) {
1310: $helper->{VARS}->{$self->{'variable'}} = join('|||', @$chosenValue);
1311: }
1312:
1313: if (defined($self->{NEXTSTATE})) {
1314: $helper->changeState($self->{NEXTSTATE});
1315: }
1316:
1317: foreach my $choice (@{$self->{CHOICES}}) {
1318: if ($choice->[1] eq $chosenValue) {
1319: if (defined($choice->[2])) {
1320: $helper->changeState($choice->[2]);
1321: }
1322: }
1323: }
1324: return 1;
1325: }
1326: 1;
1327:
1328: package Apache::lonhelper::dropdown;
1329:
1330: =pod
1331:
1332: =head2 Element: dropdownX<dropdown, helper tag>
1333:
1334: A drop-down provides a drop-down box instead of a radio button
1335: box. Because most people do not know how to use a multi-select
1336: drop-down box, that option is not allowed. Otherwise, the arguments
1337: are the same as "choices", except "allowempty" is also meaningless.
1338:
1339: <dropdown> takes an attribute "variable" to control which helper variable
1340: the result is stored in.
1341:
1342: =head3 SUB-TAGS
1343:
1344: <choice>, which acts just as it does in the "choices" element.
1345:
1346: =cut
1347:
1348: # This really ought to be a sibling class to "choice" which is itself
1349: # a child of some abstract class.... *shrug*
1350:
1351: no strict;
1352: @ISA = ("Apache::lonhelper::element");
1353: use strict;
1354: use Apache::lonlocal;
1355: use Apache::lonnet;
1356:
1357: BEGIN {
1358: &Apache::lonhelper::register('Apache::lonhelper::dropdown',
1359: ('dropdown'));
1360: }
1361:
1362: sub new {
1363: my $ref = Apache::lonhelper::element->new();
1364: bless($ref);
1365: }
1366:
1367: # CONSTRUCTION: Construct the message element from the XML
1368: sub start_dropdown {
1369: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1370:
1371: if ($target ne 'helper') {
1372: return '';
1373: }
1374:
1375: # Need to initialize the choices list, so everything can assume it exists
1376: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1377: $helper->declareVar($paramHash->{'variable'});
1378: $paramHash->{CHOICES} = [];
1379: return '';
1380: }
1381:
1382: sub end_dropdown {
1383: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1384:
1385: if ($target ne 'helper') {
1386: return '';
1387: }
1388: Apache::lonhelper::dropdown->new();
1389: return '';
1390: }
1391:
1392: sub render {
1393: my $self = shift;
1394: my $var = $self->{'variable'};
1395: my $result = '';
1396:
1397: if (defined $self->{ERROR_MSG}) {
1398: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1399: }
1400:
1401: my %checkedChoices;
1402: my $checkedChoicesFunc;
1403:
1404: if (defined($self->{DEFAULT_VALUE})) {
1405: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1406: die 'Error in default value code for variable ' .
1407: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1408: } else {
1409: $checkedChoicesFunc = sub { return ''; };
1410: }
1411:
1412: # single choice
1413: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1414:
1415: my $foundChoice = 0;
1416:
1417: # check that the choice is in the list of choices.
1418: for my $choice (@{$self->{CHOICES}}) {
1419: if ($choice->[1] eq $selectedChoice) {
1420: $checkedChoices{$choice->[1]} = 1;
1421: $foundChoice = 1;
1422: }
1423: }
1424:
1425: # If we couldn't find the choice, pick the first one
1426: if (!$foundChoice) {
1427: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1428: }
1429:
1430: $result .= "<select name='${var}.forminput'>\n";
1431: foreach my $choice (@{$self->{CHOICES}}) {
1432: $result .= "<option value='" .
1433: HTML::Entities::encode($choice->[1],"<>&\"'")
1434: . "'";
1435: if ($checkedChoices{$choice->[1]}) {
1436: $result .= " selected='selected' ";
1437: }
1438: my $choiceLabel = $choice->[0];
1439: if ($choice->[4]) { # if we need to evaluate this choice
1440: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1441: $choiceLabel . "}";
1442: $choiceLabel = eval($choiceLabel);
1443: $choiceLabel = &$choiceLabel($helper, $self);
1444: }
1445: $result .= ">" . &mtn($choiceLabel) . "</option>\n";
1446: }
1447: $result .= "</select>\n";
1448:
1449: return $result;
1450: }
1451:
1452: # If a NEXTSTATE was given or a nextstate for this choice was
1453: # given, switch to it
1454: sub postprocess {
1455: my $self = shift;
1456: my $chosenValue = $env{'form.' . $self->{'variable'} . '.forminput'};
1457:
1458: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1459: $self->{ERROR_MSG} = "You must choose one or more choices to" .
1460: " continue.";
1461: return 0;
1462: }
1463:
1464: if (defined($self->{NEXTSTATE})) {
1465: $helper->changeState($self->{NEXTSTATE});
1466: }
1467:
1468: foreach my $choice (@{$self->{CHOICES}}) {
1469: if ($choice->[1] eq $chosenValue) {
1470: if (defined($choice->[2])) {
1471: $helper->changeState($choice->[2]);
1472: }
1473: }
1474: }
1475: return 1;
1476: }
1477: 1;
1478:
1479: package Apache::lonhelper::date;
1480:
1481: =pod
1482:
1483: =head2 Element: dateX<date, helper element>
1484:
1485: Date elements allow the selection of a date with a drop down list.
1486:
1487: Date elements can take two attributes:
1488:
1489: =over 4
1490:
1491: =item * B<variable>: The name of the variable to store the chosen
1492: date in. Required.
1493:
1494: =item * B<hoursminutes>: If a true value, the date will show hours
1495: and minutes, as well as month/day/year. If false or missing,
1496: the date will only show the month, day, and year.
1497:
1498: =back
1499:
1500: Date elements contain only an option <nextstate> tag to determine
1501: the next state.
1502:
1503: Example:
1504:
1505: <date variable="DUE_DATE" hoursminutes="1">
1506: <nextstate>choose_why</nextstate>
1507: </date>
1508:
1509: =cut
1510:
1511: no strict;
1512: @ISA = ("Apache::lonhelper::element");
1513: use strict;
1514: use Apache::lonlocal; # A localization nightmare
1515: use Apache::lonnet;
1516: use Time::localtime;
1517:
1518: BEGIN {
1519: &Apache::lonhelper::register('Apache::lonhelper::date',
1520: ('date'));
1521: }
1522:
1523: # Don't need to override the "new" from element
1524: sub new {
1525: my $ref = Apache::lonhelper::element->new();
1526: bless($ref);
1527: }
1528:
1529: my @months = ("January", "February", "March", "April", "May", "June", "July",
1530: "August", "September", "October", "November", "December");
1531:
1532: # CONSTRUCTION: Construct the message element from the XML
1533: sub start_date {
1534: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1535:
1536: if ($target ne 'helper') {
1537: return '';
1538: }
1539:
1540: $paramHash->{'variable'} = $token->[2]{'variable'};
1541: $helper->declareVar($paramHash->{'variable'});
1542: $paramHash->{'hoursminutes'} = $token->[2]{'hoursminutes'};
1543: $paramHash->{'anytime'} = $token->[2]{'anytime'};
1544: }
1545:
1546: sub end_date {
1547: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1548:
1549: if ($target ne 'helper') {
1550: return '';
1551: }
1552: Apache::lonhelper::date->new();
1553: return '';
1554: }
1555:
1556: sub render {
1557: my $self = shift;
1558: my $result = "";
1559: my $var = $self->{'variable'};
1560:
1561: my $date;
1562:
1563: my $time=time;
1564: my ($anytime,$onclick);
1565:
1566: if (defined($self->{DEFAULT_VALUE})) {
1567: my $valueFunc = eval($self->{DEFAULT_VALUE});
1568: die('Error in default value code for variable ' .
1569: $self->{'variable'} . ', Perl said: ' . $@) if $@;
1570: $time = &$valueFunc($helper, $self);
1571: if (lc($time) eq 'anytime') { $time=time; $anytime=1; }
1572: }
1573: if ($anytime) {
1574: $onclick = "onclick=\"javascript:updateCheck(this.form,'${var}anytime',false)\"";
1575: }
1576: # Default date: The current hour.
1577: $date = localtime($time);
1578: $date->min(0);
1579:
1580: if (defined $self->{ERROR_MSG}) {
1581: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1582: }
1583:
1584: # Month
1585: my $i;
1586: $result .= "<select $onclick name='${var}month'>\n";
1587: for ($i = 0; $i < 12; $i++) {
1588: if ($i == $date->mon) {
1589: $result .= "<option value='$i' selected='selected'>";
1590: } else {
1591: $result .= "<option value='$i'>";
1592: }
1593: $result .= &mt($months[$i]) . "</option>\n";
1594: }
1595: $result .= "</select>\n";
1596:
1597: # Day
1598: $result .= "<select $onclick name='${var}day'>\n";
1599: for ($i = 1; $i < 32; $i++) {
1600: if ($i == $date->mday) {
1601: $result .= '<option selected="selected">';
1602: } else {
1603: $result .= '<option>';
1604: }
1605: $result .= "$i</option>\n";
1606: }
1607: $result .= "</select>,\n";
1608:
1609: # Year
1610: $result .= "<select $onclick name='${var}year'>\n";
1611: for ($i = 2000; $i < 2030; $i++) { # update this after 64-bit dates
1612: if ($date->year + 1900 == $i) {
1613: $result .= "<option selected='selected'>";
1614: } else {
1615: $result .= "<option>";
1616: }
1617: $result .= "$i</option>\n";
1618: }
1619: $result .= "</select>,\n";
1620:
1621: # Display Hours and Minutes if they are called for
1622: if ($self->{'hoursminutes'}) {
1623: # This needs parameterization for times.
1624: my $am = &mt('a.m.');
1625: my $pm = &mt('p.m.');
1626: # Build hour
1627: $result .= "<select $onclick name='${var}hour'>\n";
1628: $result .= "<option " . ($date->hour == 0 ? 'selected="selected" ':'') .
1629: " value='0'>" . &mt('midnight') . "</option>\n";
1630: for ($i = 1; $i < 12; $i++) {
1631: if ($date->hour == $i) {
1632: $result .= "<option selected='selected' value='$i'>$i $am</option>\n";
1633: } else {
1634: $result .= "<option value='$i'>$i $am</option>\n";
1635: }
1636: }
1637: $result .= "<option " . ($date->hour == 12 ? 'selected="selected" ':'') .
1638: " value='12'>" . &mt('noon') . "</option>\n";
1639: for ($i = 13; $i < 24; $i++) {
1640: my $printedHour = $i - 12;
1641: if ($date->hour == $i) {
1642: $result .= "<option selected='selected' value='$i'>$printedHour $pm</option>\n";
1643: } else {
1644: $result .= "<option value='$i'>$printedHour $pm</option>\n";
1645: }
1646: }
1647:
1648: $result .= "</select> :\n";
1649:
1650: $result .= "<select $onclick name='${var}minute'>\n";
1651: my $selected=0;
1652: for my $i ((0,15,30,45,59,undef,0..59)) {
1653: my $printedMinute = $i;
1654: if (defined($i) && $i < 10) {
1655: $printedMinute = "0" . $printedMinute;
1656: }
1657: if (!$selected && $date->min == $i) {
1658: $result .= "<option selected='selected'>";
1659: $selected=1;
1660: } else {
1661: $result .= "<option>";
1662: }
1663: $result .= "$printedMinute</option>\n";
1664: }
1665: $result .= "</select>\n";
1666: }
1667: if ($self->{'anytime'}) {
1668: $result.=(<<CHECK);
1669: <script type="text/javascript">
1670: // <!--
1671: function updateCheck(form,name,value) {
1672: var checkbox=form[name];
1673: checkbox.checked = value;
1674: }
1675: // -->
1676: </script>
1677: CHECK
1678: $result.=" or <label><input type='checkbox' ";
1679: if ($anytime) {
1680: $result.=' checked="checked" '
1681: }
1682: $result.="name='${var}anytime'/>".&mt('Anytime').'</label>'
1683: }
1684: return $result;
1685:
1686: }
1687: # If a NEXTSTATE was given, switch to it
1688: sub postprocess {
1689: my $self = shift;
1690: my $var = $self->{'variable'};
1691: if ($env{'form.' . $var . 'anytime'}) {
1692: $helper->{VARS}->{$var} = undef;
1693: } else {
1694: my $month = $env{'form.' . $var . 'month'};
1695: my $day = $env{'form.' . $var . 'day'};
1696: my $year = $env{'form.' . $var . 'year'};
1697: my $min = 0;
1698: my $hour = 0;
1699: if ($self->{'hoursminutes'}) {
1700: $min = $env{'form.' . $var . 'minute'};
1701: $hour = $env{'form.' . $var . 'hour'};
1702: }
1703:
1704: my $chosenDate;
1705: eval {$chosenDate = Time::Local::timelocal(0, $min, $hour, $day, $month, $year);};
1706: my $error = $@;
1707:
1708: # Check to make sure that the date was not automatically co-erced into a
1709: # valid date, as we want to flag that as an error
1710: # This happens for "Feb. 31", for instance, which is coerced to March 2 or
1711: # 3, depending on if it's a leap year
1712: my $checkDate = localtime($chosenDate);
1713:
1714: if ($error || $checkDate->mon != $month || $checkDate->mday != $day ||
1715: $checkDate->year + 1900 != $year) {
1716: unless (Apache::lonlocal::current_language()== ~/^en/) {
1717: $self->{ERROR_MSG} = &mt("Invalid date entry");
1718: return 0;
1719: }
1720: # LOCALIZATION FIXME: Needs to be parameterized
1721: $self->{ERROR_MSG} = "Can't use " . $months[$month] . " $day, $year as a "
1722: . "date because it doesn't exist. Please enter a valid date.";
1723:
1724: return 0;
1725: }
1726: $helper->{VARS}->{$var} = $chosenDate;
1727: }
1728:
1729: if (defined($self->{NEXTSTATE})) {
1730: $helper->changeState($self->{NEXTSTATE});
1731: }
1732:
1733: return 1;
1734: }
1735: 1;
1736:
1737: package Apache::lonhelper::resource;
1738:
1739: =pod
1740:
1741: =head2 Element: resourceX<resource, helper element>
1742:
1743: <resource> elements allow the user to select one or multiple resources
1744: from the current course. You can filter out which resources they can view,
1745: and filter out which resources they can select. The course will always
1746: be displayed fully expanded, because of the difficulty of maintaining
1747: selections across folder openings and closings. If this is fixed, then
1748: the user can manipulate the folders.
1749:
1750: <resource> takes the standard variable attribute to control what helper
1751: variable stores the results. It also takes a "multichoice"X<multichoice> attribute,
1752: which controls whether the user can select more then one resource. The
1753: "toponly" attribute controls whether the resource display shows just the
1754: resources in that sequence, or recurses into all sub-sequences, defaulting
1755: to false. The "suppressEmptySequences" attribute reflects the
1756: suppressEmptySequences argument to the render routine, which will cause
1757: folders that have all of their contained resources filtered out to also
1758: be filtered out. The 'addstatus' attribute, if true, will add the icon
1759: and long status display columns to the display. The 'addparts'
1760: attribute will add in a part selector beside problems that have more
1761: than 1 part.
1762:
1763: =head3 SUB-TAGS
1764:
1765: =over 4
1766:
1767: =item * <filterfunc>X<filterfunc>: If you want to filter what resources are displayed
1768: to the user, use a filter func. The <filterfunc> tag should contain
1769: Perl code that when wrapped with "sub { my $res = shift; " and "}" is
1770: a function that returns true if the resource should be displayed,
1771: and false if it should be skipped. $res is a resource object.
1772: (See Apache::lonnavmaps documentation for information about the
1773: resource object.)
1774:
1775: =item * <choicefunc>X<choicefunc>: Same as <filterfunc>, except that controls whether
1776: the given resource can be chosen. (It is almost always a good idea to
1777: show the user the folders, for instance, but you do not always want to
1778: let the user select them.)
1779:
1780: =item * <nextstate>: Standard nextstate behavior.
1781:
1782: =item * <valuefunc>X<valuefunc>: This function controls what is returned by the resource
1783: when the user selects it. Like filterfunc and choicefunc, it should be
1784: a function fragment that when wrapped by "sub { my $res = shift; " and
1785: "}" returns a string representing what you want to have as the value. By
1786: default, the value will be the resource ID of the object ($res->{ID}).
1787:
1788: =item * <mapurl>X<mapurl>: If the URL of a map is given here, only that map
1789: will be displayed, instead of the whole course. If the attribute
1790: "evaluate" is given and is true, the contents of the mapurl will be
1791: evaluated with "sub { my $helper = shift; my $state = shift;" and
1792: "}", with the return value used as the mapurl.
1793:
1794: =back
1795:
1796: =cut
1797:
1798: no strict;
1799: @ISA = ("Apache::lonhelper::element");
1800: use strict;
1801: use Apache::lonnet;
1802:
1803: BEGIN {
1804: &Apache::lonhelper::register('Apache::lonhelper::resource',
1805: ('resource', 'filterfunc',
1806: 'choicefunc', 'valuefunc',
1807: 'mapurl','option'));
1808: }
1809:
1810: sub new {
1811: my $ref = Apache::lonhelper::element->new();
1812: bless($ref);
1813: }
1814:
1815: # CONSTRUCTION: Construct the message element from the XML
1816: sub start_resource {
1817: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1818:
1819: if ($target ne 'helper') {
1820: return '';
1821: }
1822:
1823: $paramHash->{'variable'} = $token->[2]{'variable'};
1824: $helper->declareVar($paramHash->{'variable'});
1825: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1826: $paramHash->{'suppressEmptySequences'} = $token->[2]{'suppressEmptySequences'};
1827: $paramHash->{'toponly'} = $token->[2]{'toponly'};
1828: $paramHash->{'addstatus'} = $token->[2]{'addstatus'};
1829: $paramHash->{'addparts'} = $token->[2]{'addparts'};
1830: if ($paramHash->{'addparts'}) {
1831: $helper->declareVar($paramHash->{'variable'}.'_part');
1832: }
1833: $paramHash->{'closeallpages'} = $token->[2]{'closeallpages'};
1834: return '';
1835: }
1836:
1837: sub end_resource {
1838: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1839:
1840: if ($target ne 'helper') {
1841: return '';
1842: }
1843: if (!defined($paramHash->{FILTER_FUNC})) {
1844: $paramHash->{FILTER_FUNC} = sub {return 1;};
1845: }
1846: if (!defined($paramHash->{CHOICE_FUNC})) {
1847: $paramHash->{CHOICE_FUNC} = sub {return 1;};
1848: }
1849: if (!defined($paramHash->{VALUE_FUNC})) {
1850: $paramHash->{VALUE_FUNC} = sub {my $res = shift; return $res->{ID}; };
1851: }
1852: Apache::lonhelper::resource->new();
1853: return '';
1854: }
1855:
1856: sub start_filterfunc {
1857: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1858:
1859: if ($target ne 'helper') {
1860: return '';
1861: }
1862:
1863: my $contents = Apache::lonxml::get_all_text('/filterfunc',
1864: $parser);
1865: $contents = 'sub { my $res = shift; ' . $contents . '}';
1866: $paramHash->{FILTER_FUNC} = eval $contents;
1867: }
1868:
1869: sub end_filterfunc { return ''; }
1870:
1871: sub start_choicefunc {
1872: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1873:
1874: if ($target ne 'helper') {
1875: return '';
1876: }
1877:
1878: my $contents = Apache::lonxml::get_all_text('/choicefunc',
1879: $parser);
1880: $contents = 'sub { my $res = shift; ' . $contents . '}';
1881: $paramHash->{CHOICE_FUNC} = eval $contents;
1882: }
1883:
1884: sub end_choicefunc { return ''; }
1885:
1886: sub start_valuefunc {
1887: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1888:
1889: if ($target ne 'helper') {
1890: return '';
1891: }
1892:
1893: my $contents = Apache::lonxml::get_all_text('/valuefunc',
1894: $parser);
1895: $contents = 'sub { my $res = shift; ' . $contents . '}';
1896: $paramHash->{VALUE_FUNC} = eval $contents;
1897: }
1898:
1899: sub end_valuefunc { return ''; }
1900:
1901: sub start_mapurl {
1902: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1903:
1904: if ($target ne 'helper') {
1905: return '';
1906: }
1907:
1908: my $contents = Apache::lonxml::get_all_text('/mapurl',
1909: $parser);
1910: $paramHash->{EVAL_MAP_URL} = $token->[2]{'evaluate'};
1911: $paramHash->{MAP_URL} = $contents;
1912: }
1913:
1914: sub end_mapurl { return ''; }
1915:
1916:
1917: sub start_option {
1918: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1919: if (!defined($paramHash->{OPTION_TEXTS})) {
1920: $paramHash->{OPTION_TEXTS} = [ ];
1921: $paramHash->{OPTION_VARS} = [ ];
1922:
1923: }
1924: # OPTION_TEXTS is a list of the text attribute
1925: # values used to create column headings.
1926: # OPTION_VARS is a list of the variable names, used to create the checkbox
1927: # inputs.
1928: # We're ok with empty elements. as place holders
1929: # Although the 'variable' element should really exist.
1930: #
1931:
1932: my $option_texts = $paramHash->{OPTION_TEXTS};
1933: my $option_vars = $paramHash->{OPTION_VARS};
1934: push(@$option_texts, $token->[2]{'text'});
1935: push(@$option_vars, $token->[2]{'variable'});
1936:
1937: # Need to create and declare the option variables as well to make them
1938: # persistent.
1939: #
1940: my $varname = $token->[2]{'variable'};
1941: $helper->declareVar($varname);
1942:
1943:
1944: return '';
1945: }
1946:
1947: sub end_option {
1948: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1949: return '';
1950: }
1951:
1952: # A note, in case I don't get to this before I leave.
1953: # If someone complains about the "Back" button returning them
1954: # to the previous folder state, instead of returning them to
1955: # the previous helper state, the *correct* answer is for the helper
1956: # to keep track of how many times the user has manipulated the folders,
1957: # and feed that to the history.go() call in the helper rendering routines.
1958: # If done correctly, the helper itself can keep track of how many times
1959: # it renders the same states, so it doesn't go in just this state, and
1960: # you can lean on the browser back button to make sure it all chains
1961: # correctly.
1962: # Right now, though, I'm just forcing all folders open.
1963:
1964: sub render {
1965: my $self = shift;
1966: my $result = "";
1967: my $var = $self->{'variable'};
1968: my $curVal = $helper->{VARS}->{$var};
1969:
1970: my $buttons = '';
1971:
1972: if ($self->{'multichoice'}) {
1973: $result = <<SCRIPT;
1974: <script type="text/javascript">
1975: // <!--
1976: function checkall(value, checkName) {
1977: for (i=0; i<document.forms.helpform.elements.length; i++) {
1978: ele = document.forms.helpform.elements[i];
1979: if (ele.name == checkName + '.forminput') {
1980: document.forms.helpform.elements[i].checked=value;
1981: }
1982: }
1983: }
1984: // -->
1985: </script>
1986: SCRIPT
1987: my %lt=&Apache::lonlocal::texthash(
1988: 'sar' => "Select All Resources",
1989: 'uar' => "Unselect All Resources");
1990:
1991: $buttons = <<BUTTONS;
1992: <br />
1993: <input type="button" onclick="checkall(true, '$var')" value="$lt{'sar'}" />
1994: <input type="button" onclick="checkall(false, '$var')" value="$lt{'uar'}" />
1995: <br />
1996: BUTTONS
1997: }
1998:
1999: if (defined $self->{ERROR_MSG}) {
2000: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2001: }
2002:
2003: $result .= $buttons;
2004:
2005: my $filterFunc = $self->{FILTER_FUNC};
2006: my $choiceFunc = $self->{CHOICE_FUNC};
2007: my $valueFunc = $self->{VALUE_FUNC};
2008: my $multichoice = $self->{'multichoice'};
2009: my $option_vars = $self->{OPTION_VARS};
2010: my $option_texts = $self->{OPTION_TEXTS};
2011: my $addparts = $self->{'addparts'};
2012: my $headings_done = 0;
2013:
2014: # Evaluate the map url as needed
2015: my $mapUrl;
2016: if ($self->{EVAL_MAP_URL}) {
2017: my $mapUrlFunc = eval('sub { my $helper = shift; my $state = shift; ' .
2018: $self->{MAP_URL} . '}');
2019: $mapUrl = &$mapUrlFunc($helper, $self);
2020: } else {
2021: $mapUrl = $self->{MAP_URL};
2022: }
2023:
2024: my %defaultSymbs;
2025: if (defined($self->{DEFAULT_VALUE})) {
2026: my $valueFunc = eval($self->{DEFAULT_VALUE});
2027: die 'Error in default value code for variable ' .
2028: $self->{'variable'} . ', Perl said: ' . $@ if $@;
2029: my @defaultSymbs = &$valueFunc($helper, $self);
2030: if (!$multichoice && @defaultSymbs) { # only allowed 1
2031: @defaultSymbs = ($defaultSymbs[0]);
2032: }
2033: %defaultSymbs = map { if ($_) {($_,1) } } @defaultSymbs;
2034: delete($defaultSymbs{''});
2035: }
2036:
2037: # Create the composite function that renders the column on the nav map
2038: # have to admit any language that lets me do this can't be all bad
2039: # - Jeremy (Pythonista) ;-)
2040: my $checked = 0;
2041: my $renderColFunc = sub {
2042: my ($resource, $part, $params) = @_;
2043: my $result = "";
2044:
2045: if(!$headings_done) {
2046: if ($option_texts) {
2047: foreach my $text (@$option_texts) {
2048: $result .= "<th>$text</th>";
2049: }
2050: }
2051: $result .= "<th>Select</th>";
2052: $result .= "</tr><tr>"; # Close off the extra row and start a new one.
2053: $headings_done = 1;
2054: }
2055:
2056: my $inputType;
2057: if ($multichoice) { $inputType = 'checkbox'; }
2058: else {$inputType = 'radio'; }
2059:
2060: if (!&$choiceFunc($resource)) {
2061: $result .= '<td> </td>';
2062: return $result;
2063: } else {
2064: my $col = "";
2065: my $raw_name = &$valueFunc($resource);
2066: my $resource_name =
2067: HTML::Entities::encode($raw_name,"<>&\"'");
2068: if($option_vars) {
2069: foreach my $option_var (@$option_vars) {
2070: my $var_value = "\|\|\|" . $helper->{VARS}->{$option_var} .
2071: "\|\|\|";
2072: my $checked ="";
2073: if($var_value =~ /\Q|||$raw_name|||\E/) {
2074: $checked = "checked='checked'";
2075: }
2076: $col .=
2077: "<td align='center'><input type='checkbox' name ='$option_var".
2078: ".forminput' value='".
2079: $resource_name . "' $checked /> </td>";
2080: }
2081: }
2082:
2083: $col .= "<td align='center'><input type='$inputType' name='${var}.forminput' ";
2084: if (%defaultSymbs) {
2085: my $symb=$resource->symb();
2086: if (exists($defaultSymbs{$symb})) {
2087: $col .= "checked='checked' ";
2088: $checked = 1;
2089: }
2090: } else {
2091: if (!$checked && !$multichoice) {
2092: $col .= "checked='checked' ";
2093: $checked = 1;
2094: }
2095: if ($multichoice) { # all resources start checked; see bug 1174
2096: $col .= "checked='checked' ";
2097: $checked = 1;
2098: }
2099: }
2100: $col .= "value='" . $resource_name . "' /></td>";
2101:
2102: return $result.$col;
2103: }
2104: };
2105: my $renderPartsFunc = sub {
2106: my ($resource, $part, $params) = @_;
2107: my $col= "<td>";
2108: my $id=$resource->{ID};
2109: my $resource_name =
2110: &HTML::Entities::encode(&$valueFunc($resource),"<>&\"'");
2111: if ($addparts && (scalar(@{$resource->parts}) > 1)) {
2112: $col .= "<select onclick=\"javascript:updateRadio(this.form,'${var}.forminput','$resource_name');updateHidden(this.form,'$id','${var}');\" name='part_$id.forminput'>\n";
2113: $col .= "<option value=\"$part\">All Parts</option>\n";
2114: foreach my $part (@{$resource->parts}) {
2115: $col .= "<option value=\"$part\">Part: $part</option>\n";
2116: }
2117: $col .= "</select>";
2118: }
2119: $col .= "</td>";
2120: };
2121: $result.=(<<RADIO);
2122: <script type="text/javascript">
2123: // <!--
2124: function updateRadio(form,name,value) {
2125: var radiobutton=form[name];
2126: for (var i=0; i<radiobutton.length; i++) {
2127: if (radiobutton[i].value == value) {
2128: radiobutton[i].checked = true;
2129: break;
2130: }
2131: }
2132: }
2133: function updateHidden(form,id,name) {
2134: var select=form['part_'+id+'.forminput'];
2135: var hidden=form[name+'_part.forminput'];
2136: var which=select.selectedIndex;
2137: hidden.value=select.options[which].value;
2138: }
2139: // -->
2140: </script>
2141: <input type="hidden" name="${var}_part.forminput" />
2142:
2143: RADIO
2144: $env{'form.condition'} = !$self->{'toponly'};
2145: my $cols = [$renderColFunc];
2146: if ($self->{'addparts'}) { push(@$cols, $renderPartsFunc); }
2147: push(@$cols, Apache::lonnavmaps::resource());
2148: if ($self->{'addstatus'}) {
2149: push @$cols, (Apache::lonnavmaps::part_status_summary());
2150:
2151: }
2152: $result .=
2153: &Apache::lonnavmaps::render( { 'cols' => $cols,
2154: 'showParts' => 0,
2155: 'filterFunc' => $filterFunc,
2156: 'resource_no_folder_link' => 1,
2157: 'closeAllPages' => $self->{'closeallpages'},
2158: 'suppressEmptySequences' => $self->{'suppressEmptySequences'},
2159: 'iterator_map' => $mapUrl }
2160: );
2161:
2162: $result .= $buttons;
2163:
2164: return $result;
2165: }
2166:
2167: sub postprocess {
2168: my $self = shift;
2169:
2170: if ($self->{'multichoice'} && !$helper->{VARS}->{$self->{'variable'}}) {
2171: $self->{ERROR_MSG} = 'You must choose at least one resource to continue.';
2172: return 0;
2173: }
2174:
2175: if (defined($self->{NEXTSTATE})) {
2176: $helper->changeState($self->{NEXTSTATE});
2177: }
2178:
2179: return 1;
2180: }
2181:
2182: 1;
2183:
2184: package Apache::lonhelper::student;
2185:
2186: =pod
2187:
2188: =head2 Element: studentX<student, helper element>
2189:
2190: Student elements display a choice of students enrolled in the current
2191: course. Currently it is primitive; this is expected to evolve later.
2192:
2193: Student elements take the following attributes:
2194:
2195: =over 4
2196:
2197: =item * B<variable>:
2198:
2199: Does what it usually does: declare which helper variable to put the
2200: result in.
2201:
2202: =item * B<multichoice>:
2203:
2204: If true allows the user to select multiple students. Defaults to false.
2205:
2206: =item * B<coursepersonnel>:
2207:
2208: If true adds the course personnel to the top of the student
2209: selection. Defaults to false.
2210:
2211: =item * B<activeonly>:
2212:
2213: If true, only active students and course personnel will be
2214: shown. Defaults to false.
2215:
2216: =item * B<emptyallowed>:
2217:
2218: If true, the selection of no users is allowed. Defaults to false.
2219:
2220: =back
2221:
2222: =cut
2223:
2224: no strict;
2225: @ISA = ("Apache::lonhelper::element");
2226: use strict;
2227: use Apache::lonlocal;
2228: use Apache::lonnet;
2229:
2230: BEGIN {
2231: &Apache::lonhelper::register('Apache::lonhelper::student',
2232: ('student'));
2233: }
2234:
2235: sub new {
2236: my $ref = Apache::lonhelper::element->new();
2237: bless($ref);
2238: }
2239:
2240: sub start_student {
2241: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2242:
2243: if ($target ne 'helper') {
2244: return '';
2245: }
2246:
2247: $paramHash->{'variable'} = $token->[2]{'variable'};
2248: $helper->declareVar($paramHash->{'variable'});
2249: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2250: $paramHash->{'coursepersonnel'} = $token->[2]{'coursepersonnel'};
2251: $paramHash->{'activeonly'} = $token->[2]{'activeonly'};
2252: if (defined($token->[2]{'nextstate'})) {
2253: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2254: }
2255: $paramHash->{'emptyallowed'} = $token->[2]{'emptyallowed'};
2256:
2257: }
2258:
2259: sub end_student {
2260: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2261:
2262: if ($target ne 'helper') {
2263: return '';
2264: }
2265: Apache::lonhelper::student->new();
2266: }
2267:
2268: sub render {
2269: my $self = shift;
2270: my $result = '';
2271: my $buttons = '';
2272: my $var = $self->{'variable'};
2273:
2274: if ($self->{'multichoice'}) {
2275: $result = <<SCRIPT;
2276: <script type="text/javascript">
2277: // <!--
2278: function checkall(value, checkName) {
2279: for (i=0; i<document.forms.helpform.elements.length; i++) {
2280: ele = document.forms.helpform.elements[i];
2281: if (ele.name == checkName + '.forminput') {
2282: document.forms.helpform.elements[i].checked=value;
2283: }
2284: }
2285: }
2286: function checksec(value) {
2287: for (i=0; i<document.forms.helpform.elements.length; i++) {
2288: comp = document.forms.helpform.elements.chksec.value;
2289: if (document.forms.helpform.elements[i].value.indexOf(':'+comp+':') != -1) {
2290: if (document.forms.helpform.elements[i].value.indexOf(':Active') != -1) {
2291: document.forms.helpform.elements[i].checked=value;
2292: }
2293: }
2294: }
2295: }
2296: function checkactive() {
2297: for (i=0; i<document.forms.helpform.elements.length; i++) {
2298: if (document.forms.helpform.elements[i].value.indexOf(':Active') != -1) {
2299: document.forms.helpform.elements[i].checked=true;
2300: }
2301: }
2302: }
2303: function uncheckexpired() {
2304: for (i=0; i<document.forms.helpform.elements.length; i++) {
2305: if (document.forms.helpform.elements[i].value.indexOf(':Expired') != -1) {
2306: document.forms.helpform.elements[i].checked=false;
2307: }
2308: }
2309: }
2310: function getDesiredState() { // Return desired person state radio value.
2311: numRadio = document.forms.helpform.personstate.length;
2312: for (i =0; i < numRadio; i++) {
2313: if (document.forms.helpform.personstate[i].checked) {
2314: return document.forms.helpform.personstate[i].value;
2315: }
2316: }
2317: return "";
2318: }
2319:
2320: function checksections(value) { // Check selected sections.
2321: numSections = document.forms.helpform.chosensections.length;
2322: desiredState = getDesiredState();
2323:
2324: for (var option = 0; option < numSections; option++) {
2325: if(document.forms.helpform.chosensections.options[option].selected) {
2326: section = document.forms.helpform.chosensections.options[option].text;
2327: if (section == "none") {
2328: section ="";
2329: }
2330: for (i = 0; i < document.forms.helpform.elements.length; i++ ) {
2331: if (document.forms.helpform.elements[i].value.indexOf(':') != -1) {
2332: info = document.forms.helpform.elements[i].value.split(':');
2333: hisSection = info[2];
2334: hisState = info[4];
2335: if (desiredState == hisState ||
2336: desiredState == "All") {
2337: if(hisSection == section ||
2338: section =="" ) {
2339: document.forms.helpform.elements[i].checked = value;
2340: }
2341: }
2342: }
2343: }
2344: }
2345: }
2346: }
2347: // -->
2348: </script>
2349: SCRIPT
2350:
2351: my %lt=&Apache::lonlocal::texthash(
2352: 'ocs' => "Select Only Current Students",
2353: 'ues' => "Unselect Expired Students",
2354: 'sas' => "Select All Students",
2355: 'uas' => "Unselect All Students",
2356: 'sfsg' => "Select Current Students for Section/Group",
2357: 'ufsg' => "Unselect for Section/Group");
2358:
2359: $buttons = <<BUTTONS;
2360: <br />
2361: <table>
2362:
2363: <tr>
2364: <td><input type="button" onclick="checkall(true, '$var')" value="$lt{'sas'}" /></td>
2365: <td> <input type="button" onclick="checkall(false, '$var')" value="$lt{'uas'}" /><br /></td>
2366: </tr>
2367:
2368: </table>
2369: <br />
2370: BUTTONS
2371: }
2372:
2373: if (defined $self->{ERROR_MSG}) {
2374: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2375: }
2376:
2377: my %defaultUsers;
2378: if (defined($self->{DEFAULT_VALUE})) {
2379: my $valueFunc = eval($self->{DEFAULT_VALUE});
2380: die 'Error in default value code for variable ' .
2381: $self->{'variable'} . ', Perl said: ' . $@ if $@;
2382: my @defaultUsers = &$valueFunc($helper, $self);
2383: if (!$self->{'multichoice'} && @defaultUsers) { # only allowed 1
2384: @defaultUsers = ($defaultUsers[0]);
2385: }
2386: %defaultUsers = map { if ($_) {($_,1) } } @defaultUsers;
2387: delete($defaultUsers{''});
2388: }
2389: my $choices = [];
2390:
2391: # Load up the non-students, if necessary
2392: if ($self->{'coursepersonnel'}) {
2393: my %coursepersonnel = Apache::lonnet::get_course_adv_roles();
2394: for (sort keys %coursepersonnel) {
2395: for my $role (split /,/, $coursepersonnel{$_}) {
2396: # extract the names so we can sort them
2397: my @people;
2398:
2399: for (split /,/, $role) {
2400: push @people, [split /:/, $role];
2401: }
2402:
2403: @people = sort { $a->[0] cmp $b->[0] } @people;
2404:
2405: for my $person (@people) {
2406: push @$choices, [join(':', @$person), $person->[0], '', $_];
2407: }
2408: }
2409: }
2410: }
2411:
2412: # Constants
2413: my $section = Apache::loncoursedata::CL_SECTION();
2414: my $fullname = Apache::loncoursedata::CL_FULLNAME();
2415: my $status = Apache::loncoursedata::CL_STATUS();
2416:
2417: # Load up the students
2418: my $classlist = &Apache::loncoursedata::get_classlist();
2419: my @keys = keys %{$classlist};
2420: # Sort by: Section, name
2421: @keys = sort {
2422: if ($classlist->{$a}->[$section] ne $classlist->{$b}->[$section]) {
2423: return $classlist->{$a}->[$section] cmp $classlist->{$b}->[$section];
2424: }
2425: return $classlist->{$a}->[$fullname] cmp $classlist->{$b}->[$fullname];
2426: } @keys;
2427:
2428: # username, fullname, section, type
2429: for (@keys) {
2430: # Filter out inactive students if we've set "activeonly"
2431: if (!$self->{'activeonly'} || $classlist->{$_}->[$status] eq
2432: 'Active') {
2433: push @$choices, [$_, $classlist->{$_}->[$fullname],
2434: $classlist->{$_}->[$section],
2435: $classlist->{$_}->[$status], 'Student'];
2436: }
2437: }
2438:
2439: my $name = $self->{'coursepersonnel'} ? &mt('Name') : &mt('Student Name');
2440: my $type = 'radio';
2441: if ($self->{'multichoice'}) { $type = 'checkbox'; }
2442: $result .= "<table cellspacing='2' cellpadding='2' border='0'>\n";
2443: $result .= "<tr><td></td><td align='center'><b>$name</b></td>".
2444: "<td align='center'><b>" . &mt('Section') . "</b></td>" .
2445: "<td align='center'><b>".&mt('Status')."</b></td>" .
2446: "<td align='center'><b>" . &mt("Role") . "</b></td>" .
2447: "<td align='center'><b>".&mt('Username').":".&mt('Domain')."</b></td></tr>";
2448:
2449: my $checked = 0;
2450: for my $choice (@$choices) {
2451: $result .= "<tr><td><input type='$type' name='" .
2452: $self->{'variable'} . '.forminput' . "'";
2453:
2454: if (%defaultUsers) {
2455: my $user=$choice->[0];
2456: if (exists($defaultUsers{$user})) {
2457: $result .= " checked='checked' ";
2458: $checked = 1;
2459: }
2460: } elsif (!$self->{'multichoice'} && !$checked) {
2461: $result .= " checked='checked' ";
2462: $checked = 1;
2463: }
2464: $result .=
2465: " value='" . HTML::Entities::encode($choice->[0] . ':'
2466: .$choice->[2] . ':'
2467: .$choice->[1] . ':'
2468: .$choice->[3], "<>&\"'")
2469: . "' /></td><td>"
2470: . HTML::Entities::encode($choice->[1],'<>&"')
2471: . "</td><td align='center'>"
2472: . HTML::Entities::encode($choice->[2],'<>&"')
2473: . "</td>\n<td>"
2474: . HTML::Entities::encode($choice->[3],'<>&"')
2475: . "</td>\n<td>"
2476: . HTML::Entities::encode($choice->[4],'<>&"')
2477: . "</td>\n<td>"
2478: . HTML::Entities::encode($choice->[0],'<>&"')
2479: . "</td></tr>\n";
2480: }
2481:
2482: $result .= "</table>\n\n";
2483: $result .= $buttons;
2484: #
2485: # now add the fancy section choice... first enumerate the sections:
2486: if ($self->{'multichoice'}) {
2487: my %sections;
2488: for my $key (@keys) {
2489: my $section_name = $classlist->{$key}->[$section];
2490: if ($section_name ne "") {
2491: $sections{$section_name} = 1;
2492: }
2493: }
2494: # The variable $choice_widget will have the html to make the choice
2495: # selector.
2496: my $size=5;
2497: if (scalar(keys(%sections)) < 5) {
2498: $size=scalar(keys(%sections));
2499: }
2500: my $choice_widget = '<select multiple name="chosensections" size="'.$size.'">'."\n";
2501: foreach my $sec (sort {lc($a) cmp lc($b)} (keys(%sections))) {
2502: $choice_widget .= "<option name=\"$sec\">$sec</option>\n";
2503: }
2504: $choice_widget .= "<option>none</option></select>\n";
2505:
2506: # Build a table without any borders to contain the section based
2507: # selection:
2508:
2509: my $section_selectors =<<SECTIONSELECT;
2510: <table border="0">
2511: <tr valign="top">
2512: <td>For Sections:</td><td>$choice_widget</td>
2513: <td><label><input type="radio" name="personstate" value="Active" checked />
2514: Current Students</label></td>
2515: <td><label><input type="radio" name="personstate" value="All" />
2516: All students</label></td>
2517: <td><label><input type="radio" name="personstate" value="Expired" />
2518: Expired Students</label></td>
2519: </tr>
2520: <tr>
2521: <td><input type="button" value="Select" onclick="checksections(true);" /></td>
2522: <td><input type="button" value="Unselect" onclick="checksections(false);" /></td></tr>
2523: </table>
2524: <br />
2525: SECTIONSELECT
2526: $result .= $section_selectors;
2527: }
2528: return $result;
2529: }
2530:
2531: sub postprocess {
2532: my $self = shift;
2533:
2534: my $result = $env{'form.' . $self->{'variable'} . '.forminput'};
2535: if (!$result && !$self->{'emptyallowed'}) {
2536: if ($self->{'coursepersonnel'}) {
2537: $self->{ERROR_MSG} =
2538: &mt('You must choose at least one user to continue.');
2539: } else {
2540: $self->{ERROR_MSG} =
2541: &mt('You must choose at least one student to continue.');
2542: }
2543: return 0;
2544: }
2545:
2546: if (defined($self->{NEXTSTATE})) {
2547: $helper->changeState($self->{NEXTSTATE});
2548: }
2549:
2550: return 1;
2551: }
2552:
2553: 1;
2554:
2555: package Apache::lonhelper::files;
2556:
2557: =pod
2558:
2559: =head2 Element: filesX<files, helper element>
2560:
2561: files allows the users to choose files from a given directory on the
2562: server. It is always multichoice and stores the result as a triple-pipe
2563: delimited entry in the helper variables.
2564:
2565: Since it is extremely unlikely that you can actually code a constant
2566: representing the directory you wish to allow the user to search, <files>
2567: takes a subroutine that returns the name of the directory you wish to
2568: have the user browse.
2569:
2570: files accepts the attribute "variable" to control where the files chosen
2571: are put. It accepts the attribute "multichoice" as the other attribute,
2572: defaulting to false, which if true will allow the user to select more
2573: then one choice.
2574:
2575: <files> accepts three subtags:
2576:
2577: =over 4
2578:
2579: =item * B<nextstate>: works as it does with the other tags.
2580:
2581: =item * B<filechoice>: When the contents of this tag are surrounded by
2582: "sub {" and "}", will return a string representing what directory
2583: on the server to allow the user to choose files from.
2584:
2585: =item * B<filefilter>: Should contain Perl code that when surrounded
2586: by "sub { my $filename = shift; " and "}", returns a true value if
2587: the user can pick that file, or false otherwise. The filename
2588: passed to the function will be just the name of the file, with no
2589: path info. By default, a filter function will be used that will
2590: mask out old versions of files. This function is available as
2591: Apache::lonhelper::files::not_old_version if you want to use it to
2592: composite your own filters.
2593:
2594: =back
2595:
2596: B<General security note>: You should ensure the user can not somehow
2597: pass something into your code that would allow them to look places
2598: they should not be able to see, like the C</etc/> directory. However,
2599: the security impact would be minimal, since it would only expose
2600: the existence of files, there should be no way to parlay that into
2601: viewing the files.
2602:
2603: =cut
2604:
2605: no strict;
2606: @ISA = ("Apache::lonhelper::element");
2607: use strict;
2608: use Apache::lonlocal;
2609: use Apache::lonnet;
2610: use Apache::lonpubdir; # for getTitleString
2611:
2612: BEGIN {
2613: &Apache::lonhelper::register('Apache::lonhelper::files',
2614: ('files', 'filechoice', 'filefilter'));
2615: }
2616:
2617: sub not_old_version {
2618: my $file = shift;
2619:
2620: # Given a file name, return false if it is an "old version" of a
2621: # file, or true if it is not.
2622:
2623: if ($file =~ /^.*\.[0-9]+\.[A-Za-z]+(\.meta)?$/) {
2624: return 0;
2625: }
2626: return 1;
2627: }
2628:
2629: sub new {
2630: my $ref = Apache::lonhelper::element->new();
2631: bless($ref);
2632: }
2633:
2634: sub start_files {
2635: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2636:
2637: if ($target ne 'helper') {
2638: return '';
2639: }
2640: $paramHash->{'variable'} = $token->[2]{'variable'};
2641: $helper->declareVar($paramHash->{'variable'});
2642: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2643: }
2644:
2645: sub end_files {
2646: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2647:
2648: if ($target ne 'helper') {
2649: return '';
2650: }
2651: if (!defined($paramHash->{FILTER_FUNC})) {
2652: $paramHash->{FILTER_FUNC} = sub { return 1; };
2653: }
2654: Apache::lonhelper::files->new();
2655: }
2656:
2657: sub start_filechoice {
2658: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2659:
2660: if ($target ne 'helper') {
2661: return '';
2662: }
2663: $paramHash->{'filechoice'} = Apache::lonxml::get_all_text('/filechoice',
2664: $parser);
2665: }
2666:
2667: sub end_filechoice { return ''; }
2668:
2669: sub start_filefilter {
2670: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2671:
2672: if ($target ne 'helper') {
2673: return '';
2674: }
2675:
2676: my $contents = Apache::lonxml::get_all_text('/filefilter',
2677: $parser);
2678: $contents = 'sub { my $filename = shift; ' . $contents . '}';
2679: $paramHash->{FILTER_FUNC} = eval $contents;
2680: }
2681:
2682: sub end_filefilter { return ''; }
2683:
2684: {
2685: # used to generate unique id attributes for <input> tags.
2686: # internal use only.
2687: my $id=0;
2688: sub new_id { return $id++;}
2689: }
2690:
2691: sub render {
2692: my $self = shift;
2693: my $result = '';
2694: my $var = $self->{'variable'};
2695:
2696: my $subdirFunc = eval('sub {' . $self->{'filechoice'} . '}');
2697: die 'Error in resource filter code for variable ' .
2698: {'variable'} . ', Perl said:' . $@ if $@;
2699:
2700: my $subdir = &$subdirFunc();
2701:
2702: my $filterFunc = $self->{FILTER_FUNC};
2703: if (!defined($filterFunc)) {
2704: $filterFunc = ¬_old_version;
2705: }
2706: my $buttons = '';
2707: my $type = 'radio';
2708: if ($self->{'multichoice'}) {
2709: $type = 'checkbox';
2710: }
2711:
2712: if ($self->{'multichoice'}) {
2713: $result = <<SCRIPT;
2714: <script type="text/javascript">
2715: // <!--
2716: function checkall(value, checkName) {
2717: for (i=0; i<document.forms.helpform.elements.length; i++) {
2718: ele = document.forms.helpform.elements[i];
2719: if (ele.name == checkName + '.forminput') {
2720: document.forms.helpform.elements[i].checked=value;
2721: }
2722: }
2723: }
2724:
2725: function checkallclass(value, className) {
2726: for (i=0; i<document.forms.helpform.elements.length; i++) {
2727: ele = document.forms.helpform.elements[i];
2728: if (ele.type == "$type" && ele.onclick) {
2729: document.forms.helpform.elements[i].checked=value;
2730: }
2731: }
2732: }
2733: // -->
2734: </script>
2735: SCRIPT
2736: my %lt=&Apache::lonlocal::texthash(
2737: 'saf' => "Select All Files",
2738: 'uaf' => "Unselect All Files");
2739: $buttons = <<BUTTONS;
2740: <br />
2741: <input type="button" onclick="checkall(true, '$var')" value="$lt{'saf'}" />
2742: <input type="button" onclick="checkall(false, '$var')" value="$lt{'uaf'}" />
2743: BUTTONS
2744:
2745: %lt=&Apache::lonlocal::texthash(
2746: 'sap' => "Select All Published",
2747: 'uap' => "Unselect All Published");
2748: if ($helper->{VARS}->{'construction'}) {
2749: $buttons .= <<BUTTONS;
2750: <input type="button" onclick="checkallclass(true, 'Published')" value="$lt{'sap'}" />
2751: <input type="button" onclick="checkallclass(false, 'Published')" value="$lt{'uap'}" />
2752: <br />
2753: BUTTONS
2754: }
2755: }
2756:
2757: # Get the list of files in this directory.
2758: my @fileList;
2759:
2760: # If the subdirectory is in local CSTR space
2761: my $metadir;
2762: if ($subdir =~ m|/home/([^/]+)/public_html/(.*)|) {
2763: my ($user,$domain)=
2764: &Apache::loncacc::constructaccess($subdir,
2765: $Apache::lonnet::perlvar{'lonDefDomain'});
2766: $metadir='/res/'.$domain.'/'.$user.'/'.$2;
2767: @fileList = &Apache::lonnet::dirlist($subdir, $domain, $user, '');
2768: } elsif ($subdir =~ m|^~([^/]+)/(.*)$|) {
2769: $subdir='/home/'.$1.'/public_html/'.$2;
2770: my ($user,$domain)=
2771: &Apache::loncacc::constructaccess($subdir,
2772: $Apache::lonnet::perlvar{'lonDefDomain'});
2773: $metadir='/res/'.$domain.'/'.$user.'/'.$2;
2774: @fileList = &Apache::lonnet::dirlist($subdir, $domain, $user, '');
2775: } else {
2776: # local library server resource space
2777: @fileList = &Apache::lonnet::dirlist($subdir, $env{'user.domain'}, $env{'user.name'}, '');
2778: }
2779:
2780: # Sort the fileList into order
2781: @fileList = sort {lc($a) cmp lc($b)} @fileList;
2782:
2783: $result .= $buttons;
2784:
2785: if (defined $self->{ERROR_MSG}) {
2786: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2787: }
2788:
2789: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
2790:
2791: # Keeps track if there are no choices, prints appropriate error
2792: # if there are none.
2793: my $choices = 0;
2794: # Print each legitimate file choice.
2795: for my $file (@fileList) {
2796: $file = (split(/&/, $file))[0];
2797: if ($file eq '.' || $file eq '..') {
2798: next;
2799: }
2800: my $fileName = $subdir .'/'. $file;
2801: if (&$filterFunc($file)) {
2802: my $status;
2803: my $color;
2804: if ($helper->{VARS}->{'construction'}) {
2805: ($status, $color) = @{fileState($subdir, $file)};
2806: } else {
2807: $status = '';
2808: $color = '';
2809: }
2810:
2811: # Get the title
2812: my $title = Apache::lonpubdir::getTitleString(($metadir?$metadir:$subdir) .'/'. $file);
2813:
2814: # Netscape 4 is stupid and there's nowhere to put the
2815: # information on the input tag that the file is Published,
2816: # Unpublished, etc. In *real* browsers we can just say
2817: # "class='Published'" and check the className attribute of
2818: # the input tag, but Netscape 4 is too stupid to understand
2819: # that attribute, and un-comprehended attributes are not
2820: # reflected into the object model. So instead, what I do
2821: # is either have or don't have an "onclick" handler that
2822: # does nothing, give Published files the onclick handler, and
2823: # have the checker scripts check for that. Stupid and clumsy,
2824: # and only gives us binary "yes/no" information (at least I
2825: # couldn't figure out how to reach into the event handler's
2826: # actual code to retreive a value), but it works well enough
2827: # here.
2828:
2829: my $onclick = '';
2830: if ($status eq 'Published' && $helper->{VARS}->{'construction'}) {
2831: $onclick = 'onclick="a=1" ';
2832: }
2833: my $id = &new_id();
2834: $result .= '<tr><td align="right"' . " bgcolor='$color'>" .
2835: "<input $onclick type='$type' name='" . $var
2836: . ".forminput' ".qq{id="$id"}." value='" . HTML::Entities::encode($fileName,"<>&\"'").
2837: "'";
2838: if (!$self->{'multichoice'} && $choices == 0) {
2839: $result .= ' checked="checked"';
2840: }
2841: $result .= "/></td><td bgcolor='$color'>".
2842: qq{<label for="$id">}. $file . "</label></td>" .
2843: "<td bgcolor='$color'>$title</td>" .
2844: "<td bgcolor='$color'>$status</td>" . "</tr>\n";
2845: $choices++;
2846: }
2847: }
2848:
2849: $result .= "</table>\n";
2850:
2851: if (!$choices) {
2852: $result .= '<font color="#FF0000">There are no files available to select in this directory ('.$subdir.'). Please go back and select another option.</font><br /><br />';
2853: }
2854:
2855: $result .= $buttons;
2856:
2857: return $result;
2858: }
2859:
2860: # Determine the state of the file: Published, unpublished, modified.
2861: # Return the color it should be in and a label as a two-element array
2862: # reference.
2863: # Logic lifted from lonpubdir.pm, even though I don't know that it's still
2864: # the most right thing to do.
2865:
2866: sub fileState {
2867: my $constructionSpaceDir = shift;
2868: my $file = shift;
2869:
2870: my ($uname,$udom)=($env{'user.name'},$env{'user.domain'});
2871: if ($env{'request.role'}=~/^ca\./) {
2872: (undef,$udom,$uname)=split(/\//,$env{'request.role'});
2873: }
2874: my $docroot = $Apache::lonnet::perlvar{'lonDocRoot'};
2875: my $subdirpart = $constructionSpaceDir;
2876: $subdirpart =~ s/^\/home\/$uname\/public_html//;
2877: my $resdir = $docroot . '/res/' . $udom . '/' . $uname .
2878: $subdirpart;
2879:
2880: my @constructionSpaceFileStat = stat($constructionSpaceDir . '/' . $file);
2881: my @resourceSpaceFileStat = stat($resdir . '/' . $file);
2882: if (!@resourceSpaceFileStat) {
2883: return ['Unpublished', '#FFCCCC'];
2884: }
2885:
2886: my $constructionSpaceFileModified = $constructionSpaceFileStat[9];
2887: my $resourceSpaceFileModified = $resourceSpaceFileStat[9];
2888:
2889: if ($constructionSpaceFileModified > $resourceSpaceFileModified) {
2890: return ['Modified', '#FFFFCC'];
2891: }
2892: return ['Published', '#CCFFCC'];
2893: }
2894:
2895: sub postprocess {
2896: my $self = shift;
2897: my $result = $env{'form.' . $self->{'variable'} . '.forminput'};
2898: if (!$result) {
2899: $self->{ERROR_MSG} = 'You must choose at least one file '.
2900: 'to continue.';
2901: return 0;
2902: }
2903:
2904: if (defined($self->{NEXTSTATE})) {
2905: $helper->changeState($self->{NEXTSTATE});
2906: }
2907:
2908: return 1;
2909: }
2910:
2911: 1;
2912:
2913: package Apache::lonhelper::section;
2914:
2915: =pod
2916:
2917: =head2 Element: sectionX<section, helper element>
2918:
2919: <section> allows the user to choose one or more sections from the current
2920: course.
2921:
2922: It takes the standard attributes "variable", "multichoice", and
2923: "nextstate", meaning what they do for most other elements.
2924:
2925: =cut
2926:
2927: no strict;
2928: @ISA = ("Apache::lonhelper::choices");
2929: use strict;
2930:
2931: BEGIN {
2932: &Apache::lonhelper::register('Apache::lonhelper::section',
2933: ('section'));
2934: }
2935:
2936: sub new {
2937: my $ref = Apache::lonhelper::choices->new();
2938: bless($ref);
2939: }
2940:
2941: sub start_section {
2942: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2943:
2944: if ($target ne 'helper') {
2945: return '';
2946: }
2947:
2948: $paramHash->{CHOICES} = [];
2949:
2950: $paramHash->{'variable'} = $token->[2]{'variable'};
2951: $helper->declareVar($paramHash->{'variable'});
2952: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2953: if (defined($token->[2]{'nextstate'})) {
2954: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2955: }
2956:
2957: # Populate the CHOICES element
2958: my %choices;
2959:
2960: my $section = Apache::loncoursedata::CL_SECTION();
2961: my $classlist = Apache::loncoursedata::get_classlist();
2962: foreach (keys %$classlist) {
2963: my $sectionName = $classlist->{$_}->[$section];
2964: if (!$sectionName) {
2965: $choices{"No section assigned"} = "";
2966: } else {
2967: $choices{$sectionName} = $sectionName;
2968: }
2969: }
2970:
2971: for my $sectionName (sort(keys(%choices))) {
2972:
2973: push @{$paramHash->{CHOICES}}, [$sectionName, $sectionName];
2974: }
2975: }
2976:
2977: sub end_section {
2978: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2979:
2980: if ($target ne 'helper') {
2981: return '';
2982: }
2983: Apache::lonhelper::section->new();
2984: }
2985: 1;
2986:
2987: package Apache::lonhelper::group;
2988:
2989: =pod
2990:
2991: =head2 Element: groupX<group, helper element>
2992:
2993: <section> allows the user to choose one or more groups from the current course.
2994:
2995: It takes the standard attributes "variable", "multichoice", and "nextstate", meaning what they do for most other elements.
2996:
2997: =cut
2998:
2999: no strict;
3000: @ISA = ("Apache::lonhelper::choices");
3001: use strict;
3002:
3003: BEGIN {
3004: &Apache::lonhelper::register('Apache::lonhelper::group',
3005: ('group'));
3006: }
3007:
3008: sub new {
3009: my $ref = Apache::lonhelper::choices->new();
3010: bless($ref);
3011: }
3012:
3013: sub start_group {
3014: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3015:
3016: if ($target ne 'helper') {
3017: return '';
3018: }
3019:
3020: $paramHash->{CHOICES} = [];
3021:
3022: $paramHash->{'variable'} = $token->[2]{'variable'};
3023: $helper->declareVar($paramHash->{'variable'});
3024: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
3025: if (defined($token->[2]{'nextstate'})) {
3026: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
3027: }
3028:
3029: # Populate the CHOICES element
3030: my %choices;
3031:
3032: my $numgroups;
3033: my %curr_groups;
3034: if (&Apache::loncommon::coursegroups(\%curr_groups)) {
3035: foreach my $group_name (keys %curr_groups) {
3036: $choices{$group_name} = $group_name;
3037: }
3038: }
3039: foreach my $group_name (sort(keys(%choices))) {
3040: push @{$paramHash->{CHOICES}}, [$group_name, $group_name];
3041: }
3042: }
3043:
3044: sub end_group {
3045: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3046:
3047: if ($target ne 'helper') {
3048: return '';
3049: }
3050: Apache::lonhelper::group->new();
3051: }
3052: 1;
3053:
3054: package Apache::lonhelper::string;
3055:
3056: =pod
3057:
3058: =head2 Element: stringX<string, helper element>
3059:
3060: string elements provide a string entry field for the user. string elements
3061: take the usual 'variable' and 'nextstate' parameters. string elements
3062: also pass through 'maxlength' and 'size' attributes to the input tag.
3063:
3064: string honors the defaultvalue tag, if given.
3065:
3066: string honors the validation function, if given.
3067:
3068: =cut
3069:
3070: no strict;
3071: @ISA = ("Apache::lonhelper::element");
3072: use strict;
3073: use Apache::lonlocal;
3074:
3075: BEGIN {
3076: &Apache::lonhelper::register('Apache::lonhelper::string',
3077: ('string'));
3078: }
3079:
3080: sub new {
3081: my $ref = Apache::lonhelper::element->new();
3082: bless($ref);
3083: }
3084:
3085: # CONSTRUCTION: Construct the message element from the XML
3086: sub start_string {
3087: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3088:
3089: if ($target ne 'helper') {
3090: return '';
3091: }
3092:
3093: $paramHash->{'variable'} = $token->[2]{'variable'};
3094: $helper->declareVar($paramHash->{'variable'});
3095: $paramHash->{'nextstate'} = $token->[2]{'nextstate'};
3096: $paramHash->{'maxlength'} = $token->[2]{'maxlength'};
3097: $paramHash->{'size'} = $token->[2]{'size'};
3098:
3099: return '';
3100: }
3101:
3102: sub end_string {
3103: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3104:
3105: if ($target ne 'helper') {
3106: return '';
3107: }
3108: Apache::lonhelper::string->new();
3109: return '';
3110: }
3111:
3112: sub render {
3113: my $self = shift;
3114: my $result = '';
3115:
3116: if (defined $self->{ERROR_MSG}) {
3117: $result .= '<p><font color="#FF0000">' . $self->{ERROR_MSG} . '</font></p>';
3118: }
3119:
3120: $result .= '<input type="string" name="' . $self->{'variable'} . '.forminput"';
3121:
3122: if (defined($self->{'size'})) {
3123: $result .= ' size="' . $self->{'size'} . '"';
3124: }
3125: if (defined($self->{'maxlength'})) {
3126: $result .= ' maxlength="' . $self->{'maxlength'} . '"';
3127: }
3128:
3129: if (defined($self->{DEFAULT_VALUE})) {
3130: my $valueFunc = eval($self->{DEFAULT_VALUE});
3131: die 'Error in default value code for variable ' .
3132: $self->{'variable'} . ', Perl said: ' . $@ if $@;
3133: $result .= ' value="' . &$valueFunc($helper, $self) . '"';
3134: }
3135:
3136: $result .= ' />';
3137:
3138: return $result;
3139: }
3140:
3141: # If a NEXTSTATE was given, switch to it
3142: sub postprocess {
3143: my $self = shift;
3144:
3145: if (defined($self->{VALIDATOR})) {
3146: my $validator = eval($self->{VALIDATOR});
3147: die 'Died during evaluation of evaulation code; Perl said: ' . $@ if $@;
3148: my $invalid = &$validator($helper, $state, $self, $self->getValue());
3149: if ($invalid) {
3150: $self->{ERROR_MSG} = $invalid;
3151: return 0;
3152: }
3153: }
3154:
3155: if (defined($self->{'nextstate'})) {
3156: $helper->changeState($self->{'nextstate'});
3157: }
3158:
3159: return 1;
3160: }
3161:
3162: 1;
3163:
3164: package Apache::lonhelper::general;
3165:
3166: =pod
3167:
3168: =head2 General-purpose tag: <exec>X<exec, helper tag>
3169:
3170: The contents of the exec tag are executed as Perl code, B<not> inside a
3171: safe space, so the full range of $env and such is available. The code
3172: will be executed as a subroutine wrapped with the following code:
3173:
3174: "sub { my $helper = shift; my $state = shift;" and
3175:
3176: "}"
3177:
3178: The return value is ignored.
3179:
3180: $helper is the helper object. Feel free to add methods to the helper
3181: object to support whatever manipulation you may need to do (for instance,
3182: overriding the form location if the state is the final state; see
3183: parameter.helper for an example).
3184:
3185: $state is the $paramHash that has currently been generated and may
3186: be manipulated by the code in exec. Note that the $state is not yet
3187: an actual state B<object>, it is just a hash, so do not expect to
3188: be able to call methods on it.
3189:
3190: =cut
3191:
3192: use Apache::lonlocal;
3193: use Apache::lonnet;
3194:
3195: BEGIN {
3196: &Apache::lonhelper::register('Apache::lonhelper::general',
3197: 'exec', 'condition', 'clause',
3198: 'eval');
3199: }
3200:
3201: sub start_exec {
3202: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3203:
3204: if ($target ne 'helper') {
3205: return '';
3206: }
3207:
3208: my $code = &Apache::lonxml::get_all_text('/exec', $parser);
3209:
3210: $code = eval ('sub { my $helper = shift; my $state = shift; ' .
3211: $code . "}");
3212: die 'Error in <exec>, Perl said: '. $@ if $@;
3213: &$code($helper, $paramHash);
3214: }
3215:
3216: sub end_exec { return ''; }
3217:
3218: =pod
3219:
3220: =head2 General-purpose tag: <condition>
3221:
3222: The <condition> tag allows you to mask out parts of the helper code
3223: depending on some programatically determined condition. The condition
3224: tag contains a tag <clause> which contains perl code that when wrapped
3225: with "sub { my $helper = shift; my $state = shift; " and "}", returns
3226: a true value if the XML in the condition should be evaluated as a normal
3227: part of the helper, or false if it should be completely discarded.
3228:
3229: The <clause> tag must be the first sub-tag of the <condition> tag or
3230: it will not work as expected.
3231:
3232: =cut
3233:
3234: # The condition tag just functions as a marker, it doesn't have
3235: # to "do" anything. Technically it doesn't even have to be registered
3236: # with the lonxml code, but I leave this here to be explicit about it.
3237: sub start_condition { return ''; }
3238: sub end_condition { return ''; }
3239:
3240: sub start_clause {
3241: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3242:
3243: if ($target ne 'helper') {
3244: return '';
3245: }
3246:
3247: my $clause = Apache::lonxml::get_all_text('/clause', $parser);
3248: $clause = eval('sub { my $helper = shift; my $state = shift; '
3249: . $clause . '}');
3250: die 'Error in clause of condition, Perl said: ' . $@ if $@;
3251: if (!&$clause($helper, $paramHash)) {
3252: # Discard all text until the /condition.
3253: &Apache::lonxml::get_all_text('/condition', $parser);
3254: }
3255: }
3256:
3257: sub end_clause { return ''; }
3258:
3259: =pod
3260:
3261: =head2 General-purpose tag: <eval>X<eval, helper tag>
3262:
3263: The <eval> tag will be evaluated as a subroutine call passed in the
3264: current helper object and state hash as described in <condition> above,
3265: but is expected to return a string to be printed directly to the
3266: screen. This is useful for dynamically generating messages.
3267:
3268: =cut
3269:
3270: # This is basically a type of message.
3271: # Programmatically setting $paramHash->{NEXTSTATE} would work, though
3272: # it's probably bad form.
3273:
3274: sub start_eval {
3275: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3276:
3277: if ($target ne 'helper') {
3278: return '';
3279: }
3280:
3281: my $program = Apache::lonxml::get_all_text('/eval', $parser);
3282: $program = eval('sub { my $helper = shift; my $state = shift; '
3283: . $program . '}');
3284: die 'Error in eval code, Perl said: ' . $@ if $@;
3285: $paramHash->{MESSAGE_TEXT} = &$program($helper, $paramHash);
3286: }
3287:
3288: sub end_eval {
3289: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3290:
3291: if ($target ne 'helper') {
3292: return '';
3293: }
3294:
3295: Apache::lonhelper::message->new();
3296: }
3297:
3298: 1;
3299:
3300: package Apache::lonhelper::final;
3301:
3302: =pod
3303:
3304: =head2 Element: finalX<final, helper tag>
3305:
3306: <final> is a special element that works with helpers that use the <finalcode>
3307: tagX<finalcode, helper tag>. It goes through all the states and elements, executing the <finalcode>
3308: snippets and collecting the results. Finally, it takes the user out of the
3309: helper, going to a provided page.
3310:
3311: If the parameter "restartCourse" is true, this will override the buttons and
3312: will make a "Finish Helper" button that will re-initialize the course for them,
3313: which is useful for the Course Initialization helper so the users never see
3314: the old values taking effect.
3315:
3316: If the parameter "restartCourse" is not true a 'Finish' Button will be
3317: presented that takes the user back to whatever was defined as <exitpage>
3318:
3319: =cut
3320:
3321: no strict;
3322: @ISA = ("Apache::lonhelper::element");
3323: use strict;
3324: use Apache::lonlocal;
3325: use Apache::lonnet;
3326: BEGIN {
3327: &Apache::lonhelper::register('Apache::lonhelper::final',
3328: ('final', 'exitpage'));
3329: }
3330:
3331: sub new {
3332: my $ref = Apache::lonhelper::element->new();
3333: bless($ref);
3334: }
3335:
3336: sub start_final {
3337: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3338:
3339: if ($target ne 'helper') {
3340: return '';
3341: }
3342:
3343: $paramHash->{'restartCourse'} = $token->[2]{'restartCourse'};
3344:
3345: return '';
3346: }
3347:
3348: sub end_final {
3349: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3350:
3351: if ($target ne 'helper') {
3352: return '';
3353: }
3354:
3355: Apache::lonhelper::final->new();
3356:
3357: return '';
3358: }
3359:
3360: sub start_exitpage {
3361: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3362:
3363: if ($target ne 'helper') {
3364: return '';
3365: }
3366:
3367: $paramHash->{EXIT_PAGE} = &Apache::lonxml::get_all_text('/exitpage',
3368: $parser);
3369:
3370: return '';
3371: }
3372:
3373: sub end_exitpage { return ''; }
3374:
3375: sub render {
3376: my $self = shift;
3377:
3378: my @results;
3379:
3380: # Collect all the results
3381: for my $stateName (keys %{$helper->{STATES}}) {
3382: my $state = $helper->{STATES}->{$stateName};
3383:
3384: for my $element (@{$state->{ELEMENTS}}) {
3385: if (defined($element->{FINAL_CODE})) {
3386: # Compile the code.
3387: my $code = 'sub { my $helper = shift; my $element = shift; '
3388: . $element->{FINAL_CODE} . '}';
3389: $code = eval($code);
3390: die 'Error while executing final code for element with var ' .
3391: $element->{'variable'} . ', Perl said: ' . $@ if $@;
3392:
3393: my $result = &$code($helper, $element);
3394: if ($result) {
3395: push @results, $result;
3396: }
3397: }
3398: }
3399: }
3400:
3401: my $result;
3402:
3403: if (scalar(@results) != 0) {
3404: $result .= "<ul>\n";
3405: for my $re (@results) {
3406: $result .= ' <li>' . $re . "</li>\n";
3407: }
3408:
3409: if (!@results) {
3410: $result .= ' <li>' .
3411: &mt('No changes were made to current settings.') . '</li>';
3412: }
3413:
3414: $result .= '</ul>';
3415: }
3416:
3417: my $actionURL = $self->{EXIT_PAGE};
3418: my $targetURL = '';
3419: my $finish=&mt('Finish');
3420: if ($self->{'restartCourse'}) {
3421: $actionURL = '/adm/roles';
3422: $targetURL = '/adm/menu';
3423: if ($env{'course.'.$env{'request.course.id'}.'.url'}=~/^uploaded/) {
3424: $targetURL = '/adm/coursedocs';
3425: } else {
3426: $targetURL = '/adm/navmaps';
3427: }
3428: if ($env{'course.'.$env{'request.course.id'}.'.clonedfrom'}) {
3429: $targetURL = '/adm/parmset?overview=1';
3430: }
3431: my $finish=&mt('Finish Course Initialization');
3432: }
3433: my $previous = HTML::Entities::encode(&mt("<- Previous"), '<>&"');
3434: my $next = HTML::Entities::encode(&mt("Next ->"), '<>&"');
3435: my $target = " target='loncapaclient'";
3436: if (($env{'browser.interface'} eq 'textual') ||
3437: ($env{'environment.remote'} eq 'off')) { $target=''; }
3438: $result .= "<center>\n" .
3439: "<form action='".$actionURL."' method='post' $target>\n" .
3440: "<input type='button' onclick='history.go(-1)' value='$previous' />" .
3441: "<input type='hidden' name='orgurl' value='$targetURL' />" .
3442: "<input type='hidden' name='selectrole' value='1' />\n" .
3443: "<input type='hidden' name='" . $env{'request.role'} .
3444: "' value='1' />\n<input type='submit' value='" . $finish . "' />\n" .
3445: "</form></center>";
3446:
3447: return $result;
3448: }
3449:
3450: sub overrideForm {
3451: return 1;
3452: }
3453:
3454: 1;
3455:
3456: package Apache::lonhelper::parmwizfinal;
3457:
3458: # This is the final state for the parmwizard. It is not generally useful,
3459: # so it is not perldoc'ed. It does its own processing.
3460: # It is represented with <parmwizfinal />, and
3461: # should later be moved to lonparmset.pm .
3462:
3463: no strict;
3464: @ISA = ('Apache::lonhelper::element');
3465: use strict;
3466: use Apache::lonlocal;
3467: use Apache::lonnet;
3468:
3469: BEGIN {
3470: &Apache::lonhelper::register('Apache::lonhelper::parmwizfinal',
3471: ('parmwizfinal'));
3472: }
3473:
3474: use Time::localtime;
3475:
3476: sub new {
3477: my $ref = Apache::lonhelper::choices->new();
3478: bless ($ref);
3479: }
3480:
3481: sub start_parmwizfinal { return ''; }
3482:
3483: sub end_parmwizfinal {
3484: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3485:
3486: if ($target ne 'helper') {
3487: return '';
3488: }
3489: Apache::lonhelper::parmwizfinal->new();
3490: }
3491:
3492: # Renders a form that, when submitted, will form the input to lonparmset.pm
3493: sub render {
3494: my $self = shift;
3495: my $vars = $helper->{VARS};
3496:
3497: # FIXME: Unify my designators with the standard ones
3498: my %dateTypeHash = ('open_date' => "opening date",
3499: 'due_date' => "due date",
3500: 'answer_date' => "answer date",
3501: 'tries' => 'number of tries',
3502: 'weight' => 'problem weight'
3503: );
3504: my %parmTypeHash = ('open_date' => "0_opendate",
3505: 'due_date' => "0_duedate",
3506: 'answer_date' => "0_answerdate",
3507: 'tries' => '0_maxtries',
3508: 'weight' => '0_weight' );
3509: my %realParmName = ('open_date' => "opendate",
3510: 'due_date' => "duedate",
3511: 'answer_date' => "answerdate",
3512: 'tries' => 'maxtries',
3513: 'weight' => 'weight' );
3514:
3515: my $affectedResourceId = "";
3516: my $parm_name = $parmTypeHash{$vars->{ACTION_TYPE}};
3517: my $level = "";
3518: my $resourceString;
3519: my $symb;
3520: my $paramlevel;
3521:
3522: # Print the granularity, depending on the action
3523: if ($vars->{GRANULARITY} eq 'whole_course') {
3524: $resourceString .= '<li>'.&mt('for <b>all resources in the course</b>').'</li>';
3525: if ($vars->{TARGETS} eq 'course') {
3526: $level = 11; # general course, see lonparmset.pm perldoc
3527: } elsif ($vars->{TARGETS} eq 'section') {
3528: $level = 6;
3529: } else {
3530: $level = 3;
3531: }
3532: $affectedResourceId = "0.0";
3533: $symb = 'a';
3534: $paramlevel = 'general';
3535: } elsif ($vars->{GRANULARITY} eq 'map') {
3536: my $navmap = Apache::lonnavmaps::navmap->new();
3537: my $res = $navmap->getByMapPc($vars->{RESOURCE_ID});
3538: my $title = $res->compTitle();
3539: $symb = $res->symb();
3540: $resourceString .= '<li>'.&mt('for the map named [_1]',"<b>$title</b>").'</li>';
3541: if ($vars->{TARGETS} eq 'course') {
3542: $level = 10; # general course, see lonparmset.pm perldoc
3543: } elsif ($vars->{TARGETS} eq 'section') {
3544: $level = 5;
3545: } else {
3546: $level = 2;
3547: }
3548: $affectedResourceId = $vars->{RESOURCE_ID};
3549: $paramlevel = 'map';
3550: } else {
3551: my $navmap = Apache::lonnavmaps::navmap->new();
3552: my $res = $navmap->getById($vars->{RESOURCE_ID});
3553: my $part = $vars->{RESOURCE_ID_part};
3554: if ($part ne 'All Parts' && $part) { $parm_name=~s/^0/$part/; } else { $part=&mt('All Parts'); }
3555: $symb = $res->symb();
3556: my $title = $res->compTitle();
3557: $resourceString .= '<li>'.&mt('for the resource named [_1] part [_2]',"<b>$title</b>","<b>$part</b>").'</li>';
3558: if ($vars->{TARGETS} eq 'course') {
3559: $level = 7; # general course, see lonparmset.pm perldoc
3560: } elsif ($vars->{TARGETS} eq 'section') {
3561: $level = 4;
3562: } else {
3563: $level = 1;
3564: }
3565: $affectedResourceId = $vars->{RESOURCE_ID};
3566: $paramlevel = 'full';
3567: }
3568:
3569: my $result = "<form name='helpform' method='POST' action='/adm/parmset#$affectedResourceId&$parm_name&$level'>\n";
3570: $result .= "<input type='hidden' name='action' value='settable' />\n";
3571: $result .= "<input type='hidden' name='dis' value='helper' />\n";
3572: $result .= "<input type='hidden' name='pscat' value='".
3573: $realParmName{$vars->{ACTION_TYPE}}."' />\n";
3574: if ($vars->{GRANULARITY} eq 'resource') {
3575: $result .= "<input type='hidden' name='symb' value='".
3576: HTML::Entities::encode($symb,"'<>&\"") . "' />\n";
3577: } elsif ($vars->{GRANULARITY} eq 'map') {
3578: $result .= "<input type='hidden' name='pschp' value='".
3579: $affectedResourceId."' />\n";
3580: }
3581: my $part = $vars->{RESOURCE_ID_part};
3582: if ($part eq 'All Parts' || !$part) { $part=0; }
3583: $result .= "<input type='hidden' name='psprt' value='".
3584: HTML::Entities::encode($part,"'<>&\"") . "' />\n";
3585:
3586: $result .= '<p>'.&mt('Confirm that this information is correct, then click "Finish Helper" to complete setting the parameter.').'<ul>';
3587:
3588: # Print the type of manipulation:
3589: my $extra;
3590: if ($vars->{ACTION_TYPE} eq 'tries') {
3591: $extra = $vars->{TRIES};
3592: }
3593: if ($vars->{ACTION_TYPE} eq 'weight') {
3594: $extra = $vars->{WEIGHT};
3595: }
3596: $result .= "<li>";
3597: my $what = &mt($dateTypeHash{$vars->{ACTION_TYPE}});
3598: if ($extra) {
3599: $result .= &mt('Setting the [_1] to [_2]',"<b>$what</b>",$extra);
3600: } else {
3601: $result .= &mt('Setting the [_1]',"<b>$what</b>");
3602: }
3603: $result .= "</li>\n";
3604: if ($vars->{ACTION_TYPE} eq 'due_date' ||
3605: $vars->{ACTION_TYPE} eq 'answer_date') {
3606: # for due dates, we default to "date end" type entries
3607: $result .= "<input type='hidden' name='recent_date_end' " .
3608: "value='" . $vars->{PARM_DATE} . "' />\n";
3609: $result .= "<input type='hidden' name='pres_value' " .
3610: "value='" . $vars->{PARM_DATE} . "' />\n";
3611: $result .= "<input type='hidden' name='pres_type' " .
3612: "value='date_end' />\n";
3613: } elsif ($vars->{ACTION_TYPE} eq 'open_date') {
3614: $result .= "<input type='hidden' name='recent_date_start' ".
3615: "value='" . $vars->{PARM_DATE} . "' />\n";
3616: $result .= "<input type='hidden' name='pres_value' " .
3617: "value='" . $vars->{PARM_DATE} . "' />\n";
3618: $result .= "<input type='hidden' name='pres_type' " .
3619: "value='date_start' />\n";
3620: } elsif ($vars->{ACTION_TYPE} eq 'tries') {
3621: $result .= "<input type='hidden' name='pres_value' " .
3622: "value='" . $vars->{TRIES} . "' />\n";
3623: $result .= "<input type='hidden' name='pres_type' " .
3624: "value='int_pos' />\n";
3625: } elsif ($vars->{ACTION_TYPE} eq 'weight') {
3626: $result .= "<input type='hidden' name='pres_value' " .
3627: "value='" . $vars->{WEIGHT} . "' />\n";
3628: }
3629:
3630: $result .= $resourceString;
3631:
3632: # Print targets
3633: if ($vars->{TARGETS} eq 'course') {
3634: $result .= '<li>'.&mt('for <b>all students in course</b>').'</li>';
3635: } elsif ($vars->{TARGETS} eq 'section') {
3636: my $section = $vars->{SECTION_NAME};
3637: $result .= '<li>'.&mt('for section [_1]',"<b>$section</b>").'</li>';
3638: $result .= "<input type='hidden' name='csec' value='" .
3639: HTML::Entities::encode($section,"'<>&\"") . "' />\n";
3640: } elsif ($vars->{TARGETS} eq 'group') {
3641: my $group = $vars->{GROUP_NAME};
3642: $result .= '<li>'.&mt('for group [_1]',"<b>$group</b>").'</li>';
3643: $result .= "<input type='hidden' name='cgroup' value='" .
3644: HTML::Entities::encode($group,"'<>&\"") . "' />\n";
3645: } else {
3646: # FIXME: This is probably wasteful! Store the name!
3647: my $classlist = Apache::loncoursedata::get_classlist();
3648: my ($uname,$udom)=split(':',$vars->{USER_NAME});
3649: my $name = $classlist->{$uname.':'.$udom}->[6];
3650: $result .= '<li>'.&mt('for [_1]',"<b>$name</b>").'</li>';
3651: $result .= "<input type='hidden' name='uname' value='".
3652: HTML::Entities::encode($uname,"'<>&\"") . "' />\n";
3653: $result .= "<input type='hidden' name='udom' value='".
3654: HTML::Entities::encode($udom,"'<>&\"") . "' />\n";
3655: }
3656:
3657: # Print value
3658: if ($vars->{ACTION_TYPE} ne 'tries' && $vars->{ACTION_TYPE} ne 'weight') {
3659: $result .= '<li>'.&mt('to [_1] ([_2])',"<b>".ctime($vars->{PARM_DATE})."</b>",Apache::lonnavmaps::timeToHumanString($vars->{PARM_DATE}))."</li>\n";
3660: }
3661:
3662: # print pres_marker
3663: $result .= "\n<input type='hidden' name='pres_marker'" .
3664: " value='$affectedResourceId&$parm_name&$level' />\n";
3665:
3666: # Make the table appear
3667: $result .= "\n<input type='hidden' value='true' name='prevvisit' />";
3668: $result .= "\n<input type='hidden' value='$symb' name='pssymb' />";
3669: $result .= "\n<input type='hidden' value='$paramlevel' name='parmlev' />";
3670:
3671: $result .= "<br /><br /><center><input type='submit' value='".&mt('Finish Helper')."' /></center></form>\n";
3672:
3673: return $result;
3674: }
3675:
3676: sub overrideForm {
3677: return 1;
3678: }
3679:
3680: 1;
3681:
3682: __END__
3683:
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