1: # The LearningOnline Network with CAPA
2: # .helper XML handler to implement the LON-CAPA helper
3: #
4: # $Id: lonhelper.pm,v 1.119 2005/10/11 21:16:37 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 $bodytag = &Apache::loncommon::bodytag($helperTitle,'','');
580: my $previous = HTML::Entities::encode(&mt("<- Previous"), '<>&"');
581: my $next = HTML::Entities::encode(&mt("Next ->"), '<>&"');
582: # FIXME: This should be parameterized, not concatenated - Jeremy
583: my $loncapaHelper = &mt("LON-CAPA Helper:");
584:
585: $result .= <<HEADER;
586: $html
587: <head>
588: <title>$loncapaHelper: $helperTitle</title>
589: </head>
590: $bodytag
591: HEADER
592: if (!$state->overrideForm()) { $result.="<form name='helpform' method='POST'>"; }
593: $result .= <<HEADER;
594: <table border="0" width='100%'><tr><td>
595: <h2><i>$stateTitle</i></h2>
596: HEADER
597:
598: $result .= "<table cellpadding='10' width='100%'><tr><td rowspan='2' valign='top'>";
599:
600: if (!$state->overrideForm()) {
601: $result .= $self->_saveVars();
602: }
603: $result .= $state->render();
604:
605: $result .= "</td><td valign='top' align='right'>";
606:
607: # Warning: Copy and pasted from below, because it's too much trouble to
608: # turn this into a subroutine
609: if (!$state->overrideForm()) {
610: if ($self->{STATE} ne $self->{START_STATE}) {
611: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
612: }
613: if ($self->{DONE}) {
614: my $returnPage = $self->{RETURN_PAGE};
615: $result .= "<a href=\"$returnPage\">" . &mt("End Helper") . "</a>";
616: }
617: else {
618: $result .= '<nobr><input name="back" type="button" ';
619: $result .= 'value="' . $previous . '" onclick="history.go(-1)" /> ';
620: $result .= '<input name="SUBMIT" type="submit" value="' . $next . '" /></nobr>';
621: }
622: }
623:
624: $result .= "</td></tr><tr><td valign='bottom' align='right'>";
625:
626: # Warning: Copy and pasted from above, because it's too much trouble to
627: # turn this into a subroutine
628: if (!$state->overrideForm()) {
629: if ($self->{STATE} ne $self->{START_STATE}) {
630: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
631: }
632: if ($self->{DONE}) {
633: my $returnPage = $self->{RETURN_PAGE};
634: $result .= "<a href=\"$returnPage\">" . &mt('End Helper') . "</a>";
635: }
636: else {
637: $result .= '<nobr><input name="back" type="button" ';
638: $result .= 'value="' . $previous . '" onclick="history.go(-1)" /> ';
639: $result .= '<input name="SUBMIT" type="submit" value="' . $next . '" /></nobr>';
640: }
641: }
642:
643: #foreach my $key (keys %{$self->{VARS}}) {
644: # $result .= "|$key| -> " . $self->{VARS}->{$key} . "<br />";
645: #}
646:
647: $result .= "</td></tr></table>";
648:
649: $result .= <<FOOTER;
650: </td>
651: </tr>
652: </table>
653: </form>
654: </body>
655: </html>
656: FOOTER
657:
658: # Handle writing out the vars to the file
659: my $file = Apache::File->new('>'.$self->{FILENAME});
660: print $file $self->_varsInFile();
661:
662: return $result;
663: }
664:
665: 1;
666:
667: package Apache::lonhelper::state;
668:
669: # States bundle things together and are responsible for compositing the
670: # various elements together. It is not generally necessary for users to
671: # use the state object directly, so it is not perldoc'ed.
672:
673: # Basically, all the states do is pass calls to the elements and aggregate
674: # the results.
675:
676: sub new {
677: my $proto = shift;
678: my $class = ref($proto) || $proto;
679: my $self = {};
680:
681: $self->{NAME} = shift;
682: $self->{TITLE} = shift;
683: $self->{ELEMENTS} = [];
684:
685: bless($self, $class);
686:
687: $helper->registerState($self);
688:
689: $state = $self;
690:
691: return $self;
692: }
693:
694: sub name {
695: my $self = shift;
696: return $self->{NAME};
697: }
698:
699: sub title {
700: my $self = shift;
701: return $self->{TITLE};
702: }
703:
704: sub preprocess {
705: my $self = shift;
706: for my $element (@{$self->{ELEMENTS}}) {
707: $element->preprocess();
708: }
709: }
710:
711: # FIXME: Document that all postprocesses must return a true value or
712: # the state transition will be overridden
713: sub postprocess {
714: my $self = shift;
715:
716: # Save the state so we can roll it back if we need to.
717: my $originalState = $helper->{STATE};
718: my $everythingSuccessful = 1;
719:
720: for my $element (@{$self->{ELEMENTS}}) {
721: my $result = $element->postprocess();
722: if (!$result) { $everythingSuccessful = 0; }
723: }
724:
725: # If not all the postprocesses were successful, override
726: # any state transitions that may have occurred. It is the
727: # responsibility of the states to make sure they have
728: # error handling in that case.
729: if (!$everythingSuccessful) {
730: $helper->{STATE} = $originalState;
731: }
732: }
733:
734: # Override the form if any element wants to.
735: # two elements overriding the form will make a mess, but that should
736: # be considered helper author error ;-)
737: sub overrideForm {
738: my $self = shift;
739: for my $element (@{$self->{ELEMENTS}}) {
740: if ($element->overrideForm()) {
741: return 1;
742: }
743: }
744: return 0;
745: }
746:
747: sub addElement {
748: my $self = shift;
749: my $element = shift;
750:
751: push @{$self->{ELEMENTS}}, $element;
752: }
753:
754: sub render {
755: my $self = shift;
756: my @results = ();
757:
758: for my $element (@{$self->{ELEMENTS}}) {
759: push @results, $element->render();
760: }
761:
762: return join("\n", @results);
763: }
764:
765: 1;
766:
767: package Apache::lonhelper::element;
768: # Support code for elements
769:
770: =pod
771:
772: =head1 Element Base Class
773:
774: The Apache::lonhelper::element base class provides support for elements
775: and defines some generally useful tags for use in elements.
776:
777: =head2 finalcode tagX<finalcode>
778:
779: Each element can contain a "finalcode" tag that, when the special FINAL
780: helper state is used, will be executed, surrounded by "sub { my $helper = shift;"
781: and "}". It is expected to return a string describing what it did, which
782: may be an empty string. See course initialization helper for an example. This is
783: generally intended for helpers like the course initialization helper, which consist
784: of several panels, each of which is performing some sort of bite-sized functionality.
785:
786: =head2 defaultvalue tagX<defaultvalue>
787:
788: Each element that accepts user input can contain a "defaultvalue" tag that,
789: when surrounded by "sub { my $helper = shift; my $state = shift; " and "}",
790: will form a subroutine that when called will provide a default value for
791: the element. How this value is interpreted by the element is specific to
792: the element itself, and possibly the settings the element has (such as
793: multichoice vs. single choice for <choices> tags).
794:
795: This is also intended for things like the course initialization wizard, where the
796: user is setting various parameters. By correctly grabbing current settings
797: and including them into the helper, it allows the user to come back to the
798: helper later and re-execute it, without needing to worry about overwriting
799: some setting accidentally.
800:
801: Again, see the course initialization helper for examples.
802:
803: =head2 validator tagX<validator>
804:
805: Some elements that accepts user input can contain a "validator" tag that,
806: when surrounded by "sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift "
807: and "}", where "$val" is the value the user entered, will form a subroutine
808: that when called will verify whether the given input is valid or not. If it
809: is valid, the routine will return a false value. If invalid, the routine
810: will return an error message to be displayed for the user.
811:
812: Consult the documentation for each element to see whether it supports this
813: tag.
814:
815: =head2 getValue methodX<getValue (helper elements)>
816:
817: If the element stores the name of the variable in a 'variable' member, which
818: the provided ones all do, you can retreive the value of the variable by calling
819: this method.
820:
821: =cut
822:
823: BEGIN {
824: &Apache::lonhelper::register('Apache::lonhelper::element',
825: ('nextstate', 'finalcode',
826: 'defaultvalue', 'validator'));
827: }
828:
829: # Because we use the param hash, this is often a sufficent
830: # constructor
831: sub new {
832: my $proto = shift;
833: my $class = ref($proto) || $proto;
834: my $self = $paramHash;
835: bless($self, $class);
836:
837: $self->{PARAMS} = $paramHash;
838: $self->{STATE} = $state;
839: $state->addElement($self);
840:
841: # Ensure param hash is not reused
842: $paramHash = {};
843:
844: return $self;
845: }
846:
847: sub start_nextstate {
848: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
849:
850: if ($target ne 'helper') {
851: return '';
852: }
853:
854: $paramHash->{NEXTSTATE} = &Apache::lonxml::get_all_text('/nextstate',
855: $parser);
856: return '';
857: }
858:
859: sub end_nextstate { return ''; }
860:
861: sub start_finalcode {
862: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
863:
864: if ($target ne 'helper') {
865: return '';
866: }
867:
868: $paramHash->{FINAL_CODE} = &Apache::lonxml::get_all_text('/finalcode',
869: $parser);
870: return '';
871: }
872:
873: sub end_finalcode { return ''; }
874:
875: sub start_defaultvalue {
876: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
877:
878: if ($target ne 'helper') {
879: return '';
880: }
881:
882: $paramHash->{DEFAULT_VALUE} = &Apache::lonxml::get_all_text('/defaultvalue',
883: $parser);
884: $paramHash->{DEFAULT_VALUE} = 'sub { my $helper = shift; my $state = shift;' .
885: $paramHash->{DEFAULT_VALUE} . '}';
886: return '';
887: }
888:
889: sub end_defaultvalue { return ''; }
890:
891: # Validators may need to take language specifications
892: sub start_validator {
893: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
894:
895: if ($target ne 'helper') {
896: return '';
897: }
898:
899: $paramHash->{VALIDATOR} = &Apache::lonxml::get_all_text('/validator',
900: $parser);
901: $paramHash->{VALIDATOR} = 'sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift;' .
902: $paramHash->{VALIDATOR} . '}';
903: return '';
904: }
905:
906: sub end_validator { return ''; }
907:
908: sub preprocess {
909: return 1;
910: }
911:
912: sub postprocess {
913: return 1;
914: }
915:
916: sub render {
917: return '';
918: }
919:
920: sub overrideForm {
921: return 0;
922: }
923:
924: sub getValue {
925: my $self = shift;
926: return $helper->{VARS}->{$self->{'variable'}};
927: }
928:
929: 1;
930:
931: package Apache::lonhelper::message;
932:
933: =pod
934:
935: =head1 Elements
936:
937: =head2 Element: messageX<message, helper element>
938:
939: Message elements display their contents, and
940: transition directly to the state in the <nextstate> attribute. Example:
941:
942: <message nextstate='GET_NAME'>
943: This is the <b>message</b> the user will see,
944: <i>HTML allowed</i>.
945: </message>
946:
947: This will display the HTML message and transition to the 'nextstate' if
948: given. The HTML will be directly inserted into the helper, so if you don't
949: want text to run together, you'll need to manually wrap the message text
950: in <p> tags, or whatever is appropriate for your HTML.
951:
952: Message tags do not add in whitespace, so if you want it, you'll need to add
953: it into states. This is done so you can inline some elements, such as
954: the <date> element, right between two messages, giving the appearence that
955: the <date> element appears inline. (Note the elements can not be embedded
956: within each other.)
957:
958: This is also a good template for creating your own new states, as it has
959: very little code beyond the state template.
960:
961: =head3 Localization
962:
963: The contents of the message tag will be run through the
964: normalize_string function and that will be used as a call to &mt.
965:
966: =cut
967:
968: no strict;
969: @ISA = ("Apache::lonhelper::element");
970: use strict;
971: use Apache::lonlocal;
972:
973: BEGIN {
974: &Apache::lonhelper::register('Apache::lonhelper::message',
975: ('message'));
976: }
977:
978: sub new {
979: my $ref = Apache::lonhelper::element->new();
980: bless($ref);
981: }
982:
983: # CONSTRUCTION: Construct the message element from the XML
984: sub start_message {
985: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
986:
987: if ($target ne 'helper') {
988: return '';
989: }
990:
991: $paramHash->{MESSAGE_TEXT} = &mtn(&Apache::lonxml::get_all_text('/message',
992: $parser));
993:
994: if (defined($token->[2]{'nextstate'})) {
995: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
996: }
997: return '';
998: }
999:
1000: sub end_message {
1001: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1002:
1003: if ($target ne 'helper') {
1004: return '';
1005: }
1006: Apache::lonhelper::message->new();
1007: return '';
1008: }
1009:
1010: sub render {
1011: my $self = shift;
1012:
1013: return &mtn($self->{MESSAGE_TEXT});
1014: }
1015: # If a NEXTSTATE was given, switch to it
1016: sub postprocess {
1017: my $self = shift;
1018: if (defined($self->{NEXTSTATE})) {
1019: $helper->changeState($self->{NEXTSTATE});
1020: }
1021:
1022: return 1;
1023: }
1024: 1;
1025:
1026: package Apache::lonhelper::choices;
1027:
1028: =pod
1029:
1030: =head2 Element: choicesX<choices, helper element>
1031:
1032: Choice states provide a single choice to the user as a text selection box.
1033: A "choice" is two pieces of text, one which will be displayed to the user
1034: (the "human" value), and one which will be passed back to the program
1035: (the "computer" value). For instance, a human may choose from a list of
1036: resources on disk by title, while your program wants the file name.
1037:
1038: <choices> takes an attribute "variable" to control which helper variable
1039: the result is stored in.
1040:
1041: <choices> takes an attribute "multichoice" which, if set to a true
1042: value, will allow the user to select multiple choices.
1043:
1044: <choices> takes an attribute "allowempty" which, if set to a true
1045: value, will allow the user to select none of the choices without raising
1046: an error message.
1047:
1048: =head3 SUB-TAGS
1049:
1050: <choices> can have the following subtags:X<choice, helper tag>
1051:
1052: =over 4
1053:
1054: =item * <nextstate>state_name</nextstate>: If given, this will cause the
1055: choice element to transition to the given state after executing.
1056: This will override the <nextstate> passed to <choices> (if any).
1057:
1058: =item * <choice />: If the choices are static,
1059: this element will allow you to specify them. Each choice
1060: contains attribute, "computer", as described above. The
1061: content of the tag will be used as the human label.
1062: For example,
1063: <choice computer='234-12-7312'>Bobby McDormik</choice>.
1064:
1065: <choice> can take a parameter "eval", which if set to
1066: a true value, will cause the contents of the tag to be
1067: evaluated as it would be in an <eval> tag; see <eval> tag
1068: below.
1069:
1070: <choice> may optionally contain a 'nextstate' attribute, which
1071: will be the state transistioned to if the choice is made, if
1072: the choice is not multichoice. This will override the nextstate
1073: passed to the parent C<choices> tag.
1074:
1075: =back
1076:
1077: To create the choices programmatically, either wrap the choices in
1078: <condition> tags (prefered), or use an <exec> block inside the <choice>
1079: tag. Store the choices in $state->{CHOICES}, which is a list of list
1080: references, where each list has three strings. The first is the human
1081: name, the second is the computer name. and the third is the option
1082: next state. For example:
1083:
1084: <exec>
1085: for (my $i = 65; $i < 65 + 26; $i++) {
1086: push @{$state->{CHOICES}}, [chr($i), $i, 'next'];
1087: }
1088: </exec>
1089:
1090: This will allow the user to select from the letters A-Z (in ASCII), while
1091: passing the ASCII value back into the helper variables, and the state
1092: will in all cases transition to 'next'.
1093:
1094: You can mix and match methods of creating choices, as long as you always
1095: "push" onto the choice list, rather then wiping it out. (You can even
1096: remove choices programmatically, but that would probably be bad form.)
1097:
1098: =head3 defaultvalue support
1099:
1100: Choices supports default values both in multichoice and single choice mode.
1101: In single choice mode, have the defaultvalue tag's function return the
1102: computer value of the box you want checked. If the function returns a value
1103: that does not correspond to any of the choices, the default behavior of selecting
1104: the first choice will be preserved.
1105:
1106: For multichoice, return a string with the computer values you want checked,
1107: delimited by triple pipes. Note this matches how the result of the <choices>
1108: tag is stored in the {VARS} hash.
1109:
1110: =cut
1111:
1112: no strict;
1113: @ISA = ("Apache::lonhelper::element");
1114: use strict;
1115: use Apache::lonlocal;
1116: use Apache::lonnet;
1117:
1118: BEGIN {
1119: &Apache::lonhelper::register('Apache::lonhelper::choices',
1120: ('choice', 'choices'));
1121: }
1122:
1123: sub new {
1124: my $ref = Apache::lonhelper::element->new();
1125: bless($ref);
1126: }
1127:
1128: # CONSTRUCTION: Construct the message element from the XML
1129: sub start_choices {
1130: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1131:
1132: if ($target ne 'helper') {
1133: return '';
1134: }
1135:
1136: # Need to initialize the choices list, so everything can assume it exists
1137: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1138: $helper->declareVar($paramHash->{'variable'});
1139: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1140: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
1141: $paramHash->{CHOICES} = [];
1142: return '';
1143: }
1144:
1145: sub end_choices {
1146: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1147:
1148: if ($target ne 'helper') {
1149: return '';
1150: }
1151: Apache::lonhelper::choices->new();
1152: return '';
1153: }
1154:
1155: sub start_choice {
1156: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1157:
1158: if ($target ne 'helper') {
1159: return '';
1160: }
1161:
1162: my $computer = $token->[2]{'computer'};
1163: my $human = &mt(&Apache::lonxml::get_all_text('/choice',
1164: $parser));
1165: my $nextstate = $token->[2]{'nextstate'};
1166: my $evalFlag = $token->[2]{'eval'};
1167: push @{$paramHash->{CHOICES}}, [&mtn($human), $computer, $nextstate,
1168: $evalFlag];
1169: return '';
1170: }
1171:
1172: sub end_choice {
1173: return '';
1174: }
1175:
1176: {
1177: # used to generate unique id attributes for <input> tags.
1178: # internal use only.
1179: my $id = 0;
1180: sub new_id { return $id++; }
1181: }
1182:
1183: sub render {
1184: my $self = shift;
1185: my $var = $self->{'variable'};
1186: my $buttons = '';
1187: my $result = '';
1188:
1189: if ($self->{'multichoice'}) {
1190: $result .= <<SCRIPT;
1191: <script type="text/javascript">
1192: // <!--
1193: function checkall(value, checkName) {
1194: for (i=0; i<document.forms.helpform.elements.length; i++) {
1195: ele = document.forms.helpform.elements[i];
1196: if (ele.name == checkName + '.forminput') {
1197: document.forms.helpform.elements[i].checked=value;
1198: }
1199: }
1200: }
1201: // -->
1202: </script>
1203: SCRIPT
1204: }
1205:
1206: # Only print "select all" and "unselect all" if there are five or
1207: # more choices; fewer then that and it looks silly.
1208: if ($self->{'multichoice'} && scalar(@{$self->{CHOICES}}) > 4) {
1209: my %lt=&Apache::lonlocal::texthash(
1210: 'sa' => "Select All",
1211: 'ua' => "Unselect All");
1212: $buttons = <<BUTTONS;
1213: <br />
1214: <input type="button" onclick="checkall(true, '$var')" value="$lt{'sa'}" />
1215: <input type="button" onclick="checkall(false, '$var')" value="$lt{'ua'}" />
1216: <br />
1217: BUTTONS
1218: }
1219:
1220: if (defined $self->{ERROR_MSG}) {
1221: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1222: }
1223:
1224: $result .= $buttons;
1225:
1226: $result .= "<table>\n\n";
1227:
1228: my %checkedChoices;
1229: my $checkedChoicesFunc;
1230:
1231: if (defined($self->{DEFAULT_VALUE})) {
1232: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1233: die 'Error in default value code for variable ' .
1234: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1235: } else {
1236: $checkedChoicesFunc = sub { return ''; };
1237: }
1238:
1239: # Process which choices should be checked.
1240: if ($self->{'multichoice'}) {
1241: for my $selectedChoice (split(/\|\|\|/, (&$checkedChoicesFunc($helper, $self)))) {
1242: $checkedChoices{$selectedChoice} = 1;
1243: }
1244: } else {
1245: # single choice
1246: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1247:
1248: my $foundChoice = 0;
1249:
1250: # check that the choice is in the list of choices.
1251: for my $choice (@{$self->{CHOICES}}) {
1252: if ($choice->[1] eq $selectedChoice) {
1253: $checkedChoices{$choice->[1]} = 1;
1254: $foundChoice = 1;
1255: }
1256: }
1257:
1258: # If we couldn't find the choice, pick the first one
1259: if (!$foundChoice) {
1260: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1261: }
1262: }
1263:
1264: my $type = "radio";
1265: if ($self->{'multichoice'}) { $type = 'checkbox'; }
1266: foreach my $choice (@{$self->{CHOICES}}) {
1267: my $id = &new_id();
1268: $result .= "<tr>\n<td width='20'> </td>\n";
1269: $result .= "<td valign='top'><input type='$type' name='$var.forminput'"
1270: . " value='" .
1271: HTML::Entities::encode($choice->[1],"<>&\"'")
1272: . "'";
1273: if ($checkedChoices{$choice->[1]}) {
1274: $result .= " checked='checked' ";
1275: }
1276: $result .= qq{id="id$id"};
1277: my $choiceLabel = $choice->[0];
1278: if ($choice->[4]) { # if we need to evaluate this choice
1279: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1280: $choiceLabel . "}";
1281: $choiceLabel = eval($choiceLabel);
1282: $choiceLabel = &$choiceLabel($helper, $self);
1283: }
1284: $result .= "/></td><td> ".qq{<label for="id$id">}.
1285: $choiceLabel. "</label></td></tr>\n";
1286: }
1287: $result .= "</table>\n\n\n";
1288: $result .= $buttons;
1289:
1290: return $result;
1291: }
1292:
1293: # If a NEXTSTATE was given or a nextstate for this choice was
1294: # given, switch to it
1295: sub postprocess {
1296: my $self = shift;
1297: my $chosenValue = $env{'form.' . $self->{'variable'} . '.forminput'};
1298:
1299: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1300: $self->{ERROR_MSG} =
1301: &mt("You must choose one or more choices to continue.");
1302: return 0;
1303: }
1304:
1305: if (ref($chosenValue)) {
1306: $helper->{VARS}->{$self->{'variable'}} = join('|||', @$chosenValue);
1307: }
1308:
1309: if (defined($self->{NEXTSTATE})) {
1310: $helper->changeState($self->{NEXTSTATE});
1311: }
1312:
1313: foreach my $choice (@{$self->{CHOICES}}) {
1314: if ($choice->[1] eq $chosenValue) {
1315: if (defined($choice->[2])) {
1316: $helper->changeState($choice->[2]);
1317: }
1318: }
1319: }
1320: return 1;
1321: }
1322: 1;
1323:
1324: package Apache::lonhelper::dropdown;
1325:
1326: =pod
1327:
1328: =head2 Element: dropdownX<dropdown, helper tag>
1329:
1330: A drop-down provides a drop-down box instead of a radio button
1331: box. Because most people do not know how to use a multi-select
1332: drop-down box, that option is not allowed. Otherwise, the arguments
1333: are the same as "choices", except "allowempty" is also meaningless.
1334:
1335: <dropdown> takes an attribute "variable" to control which helper variable
1336: the result is stored in.
1337:
1338: =head3 SUB-TAGS
1339:
1340: <choice>, which acts just as it does in the "choices" element.
1341:
1342: =cut
1343:
1344: # This really ought to be a sibling class to "choice" which is itself
1345: # a child of some abstract class.... *shrug*
1346:
1347: no strict;
1348: @ISA = ("Apache::lonhelper::element");
1349: use strict;
1350: use Apache::lonlocal;
1351: use Apache::lonnet;
1352:
1353: BEGIN {
1354: &Apache::lonhelper::register('Apache::lonhelper::dropdown',
1355: ('dropdown'));
1356: }
1357:
1358: sub new {
1359: my $ref = Apache::lonhelper::element->new();
1360: bless($ref);
1361: }
1362:
1363: # CONSTRUCTION: Construct the message element from the XML
1364: sub start_dropdown {
1365: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1366:
1367: if ($target ne 'helper') {
1368: return '';
1369: }
1370:
1371: # Need to initialize the choices list, so everything can assume it exists
1372: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1373: $helper->declareVar($paramHash->{'variable'});
1374: $paramHash->{CHOICES} = [];
1375: return '';
1376: }
1377:
1378: sub end_dropdown {
1379: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1380:
1381: if ($target ne 'helper') {
1382: return '';
1383: }
1384: Apache::lonhelper::dropdown->new();
1385: return '';
1386: }
1387:
1388: sub render {
1389: my $self = shift;
1390: my $var = $self->{'variable'};
1391: my $result = '';
1392:
1393: if (defined $self->{ERROR_MSG}) {
1394: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1395: }
1396:
1397: my %checkedChoices;
1398: my $checkedChoicesFunc;
1399:
1400: if (defined($self->{DEFAULT_VALUE})) {
1401: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1402: die 'Error in default value code for variable ' .
1403: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1404: } else {
1405: $checkedChoicesFunc = sub { return ''; };
1406: }
1407:
1408: # single choice
1409: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1410:
1411: my $foundChoice = 0;
1412:
1413: # check that the choice is in the list of choices.
1414: for my $choice (@{$self->{CHOICES}}) {
1415: if ($choice->[1] eq $selectedChoice) {
1416: $checkedChoices{$choice->[1]} = 1;
1417: $foundChoice = 1;
1418: }
1419: }
1420:
1421: # If we couldn't find the choice, pick the first one
1422: if (!$foundChoice) {
1423: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1424: }
1425:
1426: $result .= "<select name='${var}.forminput'>\n";
1427: foreach my $choice (@{$self->{CHOICES}}) {
1428: $result .= "<option value='" .
1429: HTML::Entities::encode($choice->[1],"<>&\"'")
1430: . "'";
1431: if ($checkedChoices{$choice->[1]}) {
1432: $result .= " selected='selected' ";
1433: }
1434: my $choiceLabel = $choice->[0];
1435: if ($choice->[4]) { # if we need to evaluate this choice
1436: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1437: $choiceLabel . "}";
1438: $choiceLabel = eval($choiceLabel);
1439: $choiceLabel = &$choiceLabel($helper, $self);
1440: }
1441: $result .= ">" . &mtn($choiceLabel) . "</option>\n";
1442: }
1443: $result .= "</select>\n";
1444:
1445: return $result;
1446: }
1447:
1448: # If a NEXTSTATE was given or a nextstate for this choice was
1449: # given, switch to it
1450: sub postprocess {
1451: my $self = shift;
1452: my $chosenValue = $env{'form.' . $self->{'variable'} . '.forminput'};
1453:
1454: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1455: $self->{ERROR_MSG} = "You must choose one or more choices to" .
1456: " continue.";
1457: return 0;
1458: }
1459:
1460: if (defined($self->{NEXTSTATE})) {
1461: $helper->changeState($self->{NEXTSTATE});
1462: }
1463:
1464: foreach my $choice (@{$self->{CHOICES}}) {
1465: if ($choice->[1] eq $chosenValue) {
1466: if (defined($choice->[2])) {
1467: $helper->changeState($choice->[2]);
1468: }
1469: }
1470: }
1471: return 1;
1472: }
1473: 1;
1474:
1475: package Apache::lonhelper::date;
1476:
1477: =pod
1478:
1479: =head2 Element: dateX<date, helper element>
1480:
1481: Date elements allow the selection of a date with a drop down list.
1482:
1483: Date elements can take two attributes:
1484:
1485: =over 4
1486:
1487: =item * B<variable>: The name of the variable to store the chosen
1488: date in. Required.
1489:
1490: =item * B<hoursminutes>: If a true value, the date will show hours
1491: and minutes, as well as month/day/year. If false or missing,
1492: the date will only show the month, day, and year.
1493:
1494: =back
1495:
1496: Date elements contain only an option <nextstate> tag to determine
1497: the next state.
1498:
1499: Example:
1500:
1501: <date variable="DUE_DATE" hoursminutes="1">
1502: <nextstate>choose_why</nextstate>
1503: </date>
1504:
1505: =cut
1506:
1507: no strict;
1508: @ISA = ("Apache::lonhelper::element");
1509: use strict;
1510: use Apache::lonlocal; # A localization nightmare
1511: use Apache::lonnet;
1512: use Time::localtime;
1513:
1514: BEGIN {
1515: &Apache::lonhelper::register('Apache::lonhelper::date',
1516: ('date'));
1517: }
1518:
1519: # Don't need to override the "new" from element
1520: sub new {
1521: my $ref = Apache::lonhelper::element->new();
1522: bless($ref);
1523: }
1524:
1525: my @months = ("January", "February", "March", "April", "May", "June", "July",
1526: "August", "September", "October", "November", "December");
1527:
1528: # CONSTRUCTION: Construct the message element from the XML
1529: sub start_date {
1530: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1531:
1532: if ($target ne 'helper') {
1533: return '';
1534: }
1535:
1536: $paramHash->{'variable'} = $token->[2]{'variable'};
1537: $helper->declareVar($paramHash->{'variable'});
1538: $paramHash->{'hoursminutes'} = $token->[2]{'hoursminutes'};
1539: $paramHash->{'anytime'} = $token->[2]{'anytime'};
1540: }
1541:
1542: sub end_date {
1543: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1544:
1545: if ($target ne 'helper') {
1546: return '';
1547: }
1548: Apache::lonhelper::date->new();
1549: return '';
1550: }
1551:
1552: sub render {
1553: my $self = shift;
1554: my $result = "";
1555: my $var = $self->{'variable'};
1556:
1557: my $date;
1558:
1559: my $time=time;
1560: my ($anytime,$onclick);
1561:
1562: if (defined($self->{DEFAULT_VALUE})) {
1563: my $valueFunc = eval($self->{DEFAULT_VALUE});
1564: die('Error in default value code for variable ' .
1565: $self->{'variable'} . ', Perl said: ' . $@) if $@;
1566: $time = &$valueFunc($helper, $self);
1567: if (lc($time) eq 'anytime') { $time=time; $anytime=1; }
1568: }
1569: if ($anytime) {
1570: $onclick = "onclick=\"javascript:updateCheck(this.form,'${var}anytime',false)\"";
1571: }
1572: # Default date: The current hour.
1573: $date = localtime($time);
1574: $date->min(0);
1575:
1576: if (defined $self->{ERROR_MSG}) {
1577: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1578: }
1579:
1580: # Month
1581: my $i;
1582: $result .= "<select $onclick name='${var}month'>\n";
1583: for ($i = 0; $i < 12; $i++) {
1584: if ($i == $date->mon) {
1585: $result .= "<option value='$i' selected='selected'>";
1586: } else {
1587: $result .= "<option value='$i'>";
1588: }
1589: $result .= &mt($months[$i]) . "</option>\n";
1590: }
1591: $result .= "</select>\n";
1592:
1593: # Day
1594: $result .= "<select $onclick name='${var}day'>\n";
1595: for ($i = 1; $i < 32; $i++) {
1596: if ($i == $date->mday) {
1597: $result .= '<option selected="selected">';
1598: } else {
1599: $result .= '<option>';
1600: }
1601: $result .= "$i</option>\n";
1602: }
1603: $result .= "</select>,\n";
1604:
1605: # Year
1606: $result .= "<select $onclick name='${var}year'>\n";
1607: for ($i = 2000; $i < 2030; $i++) { # update this after 64-bit dates
1608: if ($date->year + 1900 == $i) {
1609: $result .= "<option selected='selected'>";
1610: } else {
1611: $result .= "<option>";
1612: }
1613: $result .= "$i</option>\n";
1614: }
1615: $result .= "</select>,\n";
1616:
1617: # Display Hours and Minutes if they are called for
1618: if ($self->{'hoursminutes'}) {
1619: # This needs parameterization for times.
1620: my $am = &mt('a.m.');
1621: my $pm = &mt('p.m.');
1622: # Build hour
1623: $result .= "<select $onclick name='${var}hour'>\n";
1624: $result .= "<option " . ($date->hour == 0 ? 'selected="selected" ':'') .
1625: " value='0'>" . &mt('midnight') . "</option>\n";
1626: for ($i = 1; $i < 12; $i++) {
1627: if ($date->hour == $i) {
1628: $result .= "<option selected='selected' value='$i'>$i $am</option>\n";
1629: } else {
1630: $result .= "<option value='$i'>$i $am</option>\n";
1631: }
1632: }
1633: $result .= "<option " . ($date->hour == 12 ? 'selected="selected" ':'') .
1634: " value='12'>" . &mt('noon') . "</option>\n";
1635: for ($i = 13; $i < 24; $i++) {
1636: my $printedHour = $i - 12;
1637: if ($date->hour == $i) {
1638: $result .= "<option selected='selected' value='$i'>$printedHour $pm</option>\n";
1639: } else {
1640: $result .= "<option value='$i'>$printedHour $pm</option>\n";
1641: }
1642: }
1643:
1644: $result .= "</select> :\n";
1645:
1646: $result .= "<select $onclick name='${var}minute'>\n";
1647: for my $i ((0,15,30,45,59,undef,1..59)) {
1648: my $printedMinute = $i;
1649: if (defined($i) && $i < 10) {
1650: $printedMinute = "0" . $printedMinute;
1651: }
1652: if ($date->min == $i) {
1653: $result .= "<option selected='selected'>";
1654: } else {
1655: $result .= "<option>";
1656: }
1657: $result .= "$printedMinute</option>\n";
1658: }
1659: $result .= "</select>\n";
1660: }
1661: if ($self->{'anytime'}) {
1662: $result.=(<<CHECK);
1663: <script type="text/javascript">
1664: // <!--
1665: function updateCheck(form,name,value) {
1666: var checkbox=form[name];
1667: checkbox.checked = value;
1668: }
1669: // -->
1670: </script>
1671: CHECK
1672:
1673: $result.=" or <label><input type='checkbox' ";
1674: if ($anytime) {
1675: $result.=' checked="checked" '
1676: }
1677: $result.="name='${var}anytime'/>".&mt('Anytime').'</label>'
1678: }
1679: return $result;
1680:
1681: }
1682: # If a NEXTSTATE was given, switch to it
1683: sub postprocess {
1684: my $self = shift;
1685: my $var = $self->{'variable'};
1686: if ($env{'form.' . $var . 'anytime'}) {
1687: $helper->{VARS}->{$var} = undef;
1688: } else {
1689: my $month = $env{'form.' . $var . 'month'};
1690: my $day = $env{'form.' . $var . 'day'};
1691: my $year = $env{'form.' . $var . 'year'};
1692: my $min = 0;
1693: my $hour = 0;
1694: if ($self->{'hoursminutes'}) {
1695: $min = $env{'form.' . $var . 'minute'};
1696: $hour = $env{'form.' . $var . 'hour'};
1697: }
1698:
1699: my $chosenDate;
1700: eval {$chosenDate = Time::Local::timelocal(0, $min, $hour, $day, $month, $year);};
1701: my $error = $@;
1702:
1703: # Check to make sure that the date was not automatically co-erced into a
1704: # valid date, as we want to flag that as an error
1705: # This happens for "Feb. 31", for instance, which is coerced to March 2 or
1706: # 3, depending on if it's a leap year
1707: my $checkDate = localtime($chosenDate);
1708:
1709: if ($error || $checkDate->mon != $month || $checkDate->mday != $day ||
1710: $checkDate->year + 1900 != $year) {
1711: unless (Apache::lonlocal::current_language()== ~/^en/) {
1712: $self->{ERROR_MSG} = &mt("Invalid date entry");
1713: return 0;
1714: }
1715: # LOCALIZATION FIXME: Needs to be parameterized
1716: $self->{ERROR_MSG} = "Can't use " . $months[$month] . " $day, $year as a "
1717: . "date because it doesn't exist. Please enter a valid date.";
1718:
1719: return 0;
1720: }
1721: $helper->{VARS}->{$var} = $chosenDate;
1722: }
1723:
1724: if (defined($self->{NEXTSTATE})) {
1725: $helper->changeState($self->{NEXTSTATE});
1726: }
1727:
1728: return 1;
1729: }
1730: 1;
1731:
1732: package Apache::lonhelper::resource;
1733:
1734: =pod
1735:
1736: =head2 Element: resourceX<resource, helper element>
1737:
1738: <resource> elements allow the user to select one or multiple resources
1739: from the current course. You can filter out which resources they can view,
1740: and filter out which resources they can select. The course will always
1741: be displayed fully expanded, because of the difficulty of maintaining
1742: selections across folder openings and closings. If this is fixed, then
1743: the user can manipulate the folders.
1744:
1745: <resource> takes the standard variable attribute to control what helper
1746: variable stores the results. It also takes a "multichoice"X<multichoice> attribute,
1747: which controls whether the user can select more then one resource. The
1748: "toponly" attribute controls whether the resource display shows just the
1749: resources in that sequence, or recurses into all sub-sequences, defaulting
1750: to false. The "suppressEmptySequences" attribute reflects the
1751: suppressEmptySequences argument to the render routine, which will cause
1752: folders that have all of their contained resources filtered out to also
1753: be filtered out. The 'addstatus' attribute, if true, will add the icon
1754: and long status display columns to the display. The 'addparts'
1755: attribute will add in a part selector beside problems that have more
1756: than 1 part.
1757:
1758: =head3 SUB-TAGS
1759:
1760: =over 4
1761:
1762: =item * <filterfunc>X<filterfunc>: If you want to filter what resources are displayed
1763: to the user, use a filter func. The <filterfunc> tag should contain
1764: Perl code that when wrapped with "sub { my $res = shift; " and "}" is
1765: a function that returns true if the resource should be displayed,
1766: and false if it should be skipped. $res is a resource object.
1767: (See Apache::lonnavmaps documentation for information about the
1768: resource object.)
1769:
1770: =item * <choicefunc>X<choicefunc>: Same as <filterfunc>, except that controls whether
1771: the given resource can be chosen. (It is almost always a good idea to
1772: show the user the folders, for instance, but you do not always want to
1773: let the user select them.)
1774:
1775: =item * <nextstate>: Standard nextstate behavior.
1776:
1777: =item * <valuefunc>X<valuefunc>: This function controls what is returned by the resource
1778: when the user selects it. Like filterfunc and choicefunc, it should be
1779: a function fragment that when wrapped by "sub { my $res = shift; " and
1780: "}" returns a string representing what you want to have as the value. By
1781: default, the value will be the resource ID of the object ($res->{ID}).
1782:
1783: =item * <mapurl>X<mapurl>: If the URL of a map is given here, only that map
1784: will be displayed, instead of the whole course. If the attribute
1785: "evaluate" is given and is true, the contents of the mapurl will be
1786: evaluated with "sub { my $helper = shift; my $state = shift;" and
1787: "}", with the return value used as the mapurl.
1788:
1789: =back
1790:
1791: =cut
1792:
1793: no strict;
1794: @ISA = ("Apache::lonhelper::element");
1795: use strict;
1796: use Apache::lonnet;
1797:
1798: BEGIN {
1799: &Apache::lonhelper::register('Apache::lonhelper::resource',
1800: ('resource', 'filterfunc',
1801: 'choicefunc', 'valuefunc',
1802: 'mapurl','option'));
1803: }
1804:
1805: sub new {
1806: my $ref = Apache::lonhelper::element->new();
1807: bless($ref);
1808: }
1809:
1810: # CONSTRUCTION: Construct the message element from the XML
1811: sub start_resource {
1812: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1813:
1814: if ($target ne 'helper') {
1815: return '';
1816: }
1817:
1818: $paramHash->{'variable'} = $token->[2]{'variable'};
1819: $helper->declareVar($paramHash->{'variable'});
1820: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1821: $paramHash->{'suppressEmptySequences'} = $token->[2]{'suppressEmptySequences'};
1822: $paramHash->{'toponly'} = $token->[2]{'toponly'};
1823: $paramHash->{'addstatus'} = $token->[2]{'addstatus'};
1824: $paramHash->{'addparts'} = $token->[2]{'addparts'};
1825: if ($paramHash->{'addparts'}) {
1826: $helper->declareVar($paramHash->{'variable'}.'_part');
1827: }
1828: $paramHash->{'closeallpages'} = $token->[2]{'closeallpages'};
1829: return '';
1830: }
1831:
1832: sub end_resource {
1833: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1834:
1835: if ($target ne 'helper') {
1836: return '';
1837: }
1838: if (!defined($paramHash->{FILTER_FUNC})) {
1839: $paramHash->{FILTER_FUNC} = sub {return 1;};
1840: }
1841: if (!defined($paramHash->{CHOICE_FUNC})) {
1842: $paramHash->{CHOICE_FUNC} = sub {return 1;};
1843: }
1844: if (!defined($paramHash->{VALUE_FUNC})) {
1845: $paramHash->{VALUE_FUNC} = sub {my $res = shift; return $res->{ID}; };
1846: }
1847: Apache::lonhelper::resource->new();
1848: return '';
1849: }
1850:
1851: sub start_filterfunc {
1852: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1853:
1854: if ($target ne 'helper') {
1855: return '';
1856: }
1857:
1858: my $contents = Apache::lonxml::get_all_text('/filterfunc',
1859: $parser);
1860: $contents = 'sub { my $res = shift; ' . $contents . '}';
1861: $paramHash->{FILTER_FUNC} = eval $contents;
1862: }
1863:
1864: sub end_filterfunc { return ''; }
1865:
1866: sub start_choicefunc {
1867: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1868:
1869: if ($target ne 'helper') {
1870: return '';
1871: }
1872:
1873: my $contents = Apache::lonxml::get_all_text('/choicefunc',
1874: $parser);
1875: $contents = 'sub { my $res = shift; ' . $contents . '}';
1876: $paramHash->{CHOICE_FUNC} = eval $contents;
1877: }
1878:
1879: sub end_choicefunc { return ''; }
1880:
1881: sub start_valuefunc {
1882: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1883:
1884: if ($target ne 'helper') {
1885: return '';
1886: }
1887:
1888: my $contents = Apache::lonxml::get_all_text('/valuefunc',
1889: $parser);
1890: $contents = 'sub { my $res = shift; ' . $contents . '}';
1891: $paramHash->{VALUE_FUNC} = eval $contents;
1892: }
1893:
1894: sub end_valuefunc { return ''; }
1895:
1896: sub start_mapurl {
1897: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1898:
1899: if ($target ne 'helper') {
1900: return '';
1901: }
1902:
1903: my $contents = Apache::lonxml::get_all_text('/mapurl',
1904: $parser);
1905: $paramHash->{EVAL_MAP_URL} = $token->[2]{'evaluate'};
1906: $paramHash->{MAP_URL} = $contents;
1907: }
1908:
1909: sub end_mapurl { return ''; }
1910:
1911:
1912: sub start_option {
1913: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1914: if (!defined($paramHash->{OPTION_TEXTS})) {
1915: $paramHash->{OPTION_TEXTS} = [ ];
1916: $paramHash->{OPTION_VARS} = [ ];
1917:
1918: }
1919: # OPTION_TEXTS is a list of the text attribute
1920: # values used to create column headings.
1921: # OPTION_VARS is a list of the variable names, used to create the checkbox
1922: # inputs.
1923: # We're ok with empty elements. as place holders
1924: # Although the 'variable' element should really exist.
1925: #
1926:
1927: my $option_texts = $paramHash->{OPTION_TEXTS};
1928: my $option_vars = $paramHash->{OPTION_VARS};
1929: push(@$option_texts, $token->[2]{'text'});
1930: push(@$option_vars, $token->[2]{'variable'});
1931:
1932: # Need to create and declare the option variables as well to make them
1933: # persistent.
1934: #
1935: my $varname = $token->[2]{'variable'};
1936: $helper->declareVar($varname);
1937:
1938:
1939: return '';
1940: }
1941:
1942: sub end_option {
1943: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1944: return '';
1945: }
1946:
1947: # A note, in case I don't get to this before I leave.
1948: # If someone complains about the "Back" button returning them
1949: # to the previous folder state, instead of returning them to
1950: # the previous helper state, the *correct* answer is for the helper
1951: # to keep track of how many times the user has manipulated the folders,
1952: # and feed that to the history.go() call in the helper rendering routines.
1953: # If done correctly, the helper itself can keep track of how many times
1954: # it renders the same states, so it doesn't go in just this state, and
1955: # you can lean on the browser back button to make sure it all chains
1956: # correctly.
1957: # Right now, though, I'm just forcing all folders open.
1958:
1959: sub render {
1960: my $self = shift;
1961: my $result = "";
1962: my $var = $self->{'variable'};
1963: my $curVal = $helper->{VARS}->{$var};
1964:
1965: my $buttons = '';
1966:
1967: if ($self->{'multichoice'}) {
1968: $result = <<SCRIPT;
1969: <script type="text/javascript">
1970: // <!--
1971: function checkall(value, checkName) {
1972: for (i=0; i<document.forms.helpform.elements.length; i++) {
1973: ele = document.forms.helpform.elements[i];
1974: if (ele.name == checkName + '.forminput') {
1975: document.forms.helpform.elements[i].checked=value;
1976: }
1977: }
1978: }
1979: // -->
1980: </script>
1981: SCRIPT
1982: my %lt=&Apache::lonlocal::texthash(
1983: 'sar' => "Select All Resources",
1984: 'uar' => "Unselect All Resources");
1985:
1986: $buttons = <<BUTTONS;
1987: <br />
1988: <input type="button" onclick="checkall(true, '$var')" value="$lt{'sar'}" />
1989: <input type="button" onclick="checkall(false, '$var')" value="$lt{'uar'}" />
1990: <br />
1991: BUTTONS
1992: }
1993:
1994: if (defined $self->{ERROR_MSG}) {
1995: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1996: }
1997:
1998: $result .= $buttons;
1999:
2000: my $filterFunc = $self->{FILTER_FUNC};
2001: my $choiceFunc = $self->{CHOICE_FUNC};
2002: my $valueFunc = $self->{VALUE_FUNC};
2003: my $multichoice = $self->{'multichoice'};
2004: my $option_vars = $self->{OPTION_VARS};
2005: my $option_texts = $self->{OPTION_TEXTS};
2006: my $addparts = $self->{'addparts'};
2007: my $headings_done = 0;
2008:
2009: # Evaluate the map url as needed
2010: my $mapUrl;
2011: if ($self->{EVAL_MAP_URL}) {
2012: my $mapUrlFunc = eval('sub { my $helper = shift; my $state = shift; ' .
2013: $self->{MAP_URL} . '}');
2014: $mapUrl = &$mapUrlFunc($helper, $self);
2015: } else {
2016: $mapUrl = $self->{MAP_URL};
2017: }
2018:
2019:
2020: # Create the composite function that renders the column on the nav map
2021: # have to admit any language that lets me do this can't be all bad
2022: # - Jeremy (Pythonista) ;-)
2023: my $checked = 0;
2024: my $renderColFunc = sub {
2025: my ($resource, $part, $params) = @_;
2026: my $result = "";
2027:
2028: if(!$headings_done) {
2029: if ($option_texts) {
2030: foreach my $text (@$option_texts) {
2031: $result .= "<th>$text</th>";
2032: }
2033: }
2034: $result .= "<th>Select</th>";
2035: $result .= "</tr><tr>"; # Close off the extra row and start a new one.
2036: $headings_done = 1;
2037: }
2038:
2039: my $inputType;
2040: if ($multichoice) { $inputType = 'checkbox'; }
2041: else {$inputType = 'radio'; }
2042:
2043: if (!&$choiceFunc($resource)) {
2044: $result .= '<td> </td>';
2045: return $result;
2046: } else {
2047: my $col = "";
2048: my $raw_name = &$valueFunc($resource);
2049: my $resource_name =
2050: HTML::Entities::encode($raw_name,"<>&\"'");
2051: if($option_vars) {
2052: foreach my $option_var (@$option_vars) {
2053: my $var_value = "\|\|\|" . $helper->{VARS}->{$option_var} .
2054: "\|\|\|";
2055: my $checked ="";
2056: if($var_value =~ /\Q|||$raw_name|||\E/) {
2057: $checked = "checked='checked'";
2058: }
2059: $col .=
2060: "<td align='center'><input type='checkbox' name ='$option_var".
2061: ".forminput' value='".
2062: $resource_name . "' $checked /> </td>";
2063: }
2064: }
2065:
2066: $col .= "<td align='center'><input type='$inputType' name='${var}.forminput' ";
2067: if (!$checked && !$multichoice) {
2068: $col .= "checked='checked' ";
2069: $checked = 1;
2070: }
2071: if ($multichoice) { # all resources start checked; see bug 1174
2072: $col .= "checked='checked' ";
2073: $checked = 1;
2074: }
2075: $col .= "value='" . $resource_name . "' /></td>";
2076:
2077: return $result.$col;
2078: }
2079: };
2080: my $renderPartsFunc = sub {
2081: my ($resource, $part, $params) = @_;
2082: my $col= "<td>";
2083: my $id=$resource->{ID};
2084: my $resource_name =
2085: &HTML::Entities::encode(&$valueFunc($resource),"<>&\"'");
2086: if ($addparts && (scalar(@{$resource->parts}) > 1)) {
2087: $col .= "<select onclick=\"javascript:updateRadio(this.form,'${var}.forminput','$resource_name');updateHidden(this.form,'$id','${var}');\" name='part_$id.forminput'>\n";
2088: $col .= "<option value=\"$part\">All Parts</option>\n";
2089: foreach my $part (@{$resource->parts}) {
2090: $col .= "<option value=\"$part\">Part: $part</option>\n";
2091: }
2092: $col .= "</select>";
2093: }
2094: $col .= "</td>";
2095: };
2096: $result.=(<<RADIO);
2097: <script type="text/javascript">
2098: // <!--
2099: function updateRadio(form,name,value) {
2100: var radiobutton=form[name];
2101: for (var i=0; i<radiobutton.length; i++) {
2102: if (radiobutton[i].value == value) {
2103: radiobutton[i].checked = true;
2104: break;
2105: }
2106: }
2107: }
2108: function updateHidden(form,id,name) {
2109: var select=form['part_'+id+'.forminput'];
2110: var hidden=form[name+'_part.forminput'];
2111: var which=select.selectedIndex;
2112: hidden.value=select.options[which].value;
2113: }
2114: // -->
2115: </script>
2116: <input type="hidden" name="${var}_part.forminput" />
2117:
2118: RADIO
2119: $env{'form.condition'} = !$self->{'toponly'};
2120: my $cols = [$renderColFunc];
2121: if ($self->{'addparts'}) { push(@$cols, $renderPartsFunc); }
2122: push(@$cols, Apache::lonnavmaps::resource());
2123: if ($self->{'addstatus'}) {
2124: push @$cols, (Apache::lonnavmaps::part_status_summary());
2125:
2126: }
2127: $result .=
2128: &Apache::lonnavmaps::render( { 'cols' => $cols,
2129: 'showParts' => 0,
2130: 'filterFunc' => $filterFunc,
2131: 'resource_no_folder_link' => 1,
2132: 'closeAllPages' => $self->{'closeallpages'},
2133: 'suppressEmptySequences' => $self->{'suppressEmptySequences'},
2134: 'iterator_map' => $mapUrl }
2135: );
2136:
2137: $result .= $buttons;
2138:
2139: return $result;
2140: }
2141:
2142: sub postprocess {
2143: my $self = shift;
2144:
2145: if ($self->{'multichoice'} && !$helper->{VARS}->{$self->{'variable'}}) {
2146: $self->{ERROR_MSG} = 'You must choose at least one resource to continue.';
2147: return 0;
2148: }
2149:
2150: if (defined($self->{NEXTSTATE})) {
2151: $helper->changeState($self->{NEXTSTATE});
2152: }
2153:
2154: return 1;
2155: }
2156:
2157: 1;
2158:
2159: package Apache::lonhelper::student;
2160:
2161: =pod
2162:
2163: =head2 Element: studentX<student, helper element>
2164:
2165: Student elements display a choice of students enrolled in the current
2166: course. Currently it is primitive; this is expected to evolve later.
2167:
2168: Student elements take the following attributes:
2169:
2170: =over 4
2171:
2172: =item * B<variable>:
2173:
2174: Does what it usually does: declare which helper variable to put the
2175: result in.
2176:
2177: =item * B<multichoice>:
2178:
2179: If true allows the user to select multiple students. Defaults to false.
2180:
2181: =item * B<coursepersonnel>:
2182:
2183: If true adds the course personnel to the top of the student
2184: selection. Defaults to false.
2185:
2186: =item * B<activeonly>:
2187:
2188: If true, only active students and course personnel will be
2189: shown. Defaults to false.
2190:
2191: =back
2192:
2193: =cut
2194:
2195: no strict;
2196: @ISA = ("Apache::lonhelper::element");
2197: use strict;
2198: use Apache::lonlocal;
2199: use Apache::lonnet;
2200:
2201: BEGIN {
2202: &Apache::lonhelper::register('Apache::lonhelper::student',
2203: ('student'));
2204: }
2205:
2206: sub new {
2207: my $ref = Apache::lonhelper::element->new();
2208: bless($ref);
2209: }
2210:
2211: sub start_student {
2212: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2213:
2214: if ($target ne 'helper') {
2215: return '';
2216: }
2217:
2218: $paramHash->{'variable'} = $token->[2]{'variable'};
2219: $helper->declareVar($paramHash->{'variable'});
2220: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2221: $paramHash->{'coursepersonnel'} = $token->[2]{'coursepersonnel'};
2222: $paramHash->{'activeonly'} = $token->[2]{'activeonly'};
2223: if (defined($token->[2]{'nextstate'})) {
2224: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2225: }
2226:
2227: }
2228:
2229: sub end_student {
2230: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2231:
2232: if ($target ne 'helper') {
2233: return '';
2234: }
2235: Apache::lonhelper::student->new();
2236: }
2237:
2238: sub render {
2239: my $self = shift;
2240: my $result = '';
2241: my $buttons = '';
2242: my $var = $self->{'variable'};
2243:
2244: if ($self->{'multichoice'}) {
2245: $result = <<SCRIPT;
2246: <script type="text/javascript">
2247: // <!--
2248: function checkall(value, checkName) {
2249: for (i=0; i<document.forms.helpform.elements.length; i++) {
2250: ele = document.forms.helpform.elements[i];
2251: if (ele.name == checkName + '.forminput') {
2252: document.forms.helpform.elements[i].checked=value;
2253: }
2254: }
2255: }
2256: function checksec(value) {
2257: for (i=0; i<document.forms.helpform.elements.length; i++) {
2258: comp = document.forms.helpform.elements.chksec.value;
2259: if (document.forms.helpform.elements[i].value.indexOf(':'+comp+':') != -1) {
2260: if (document.forms.helpform.elements[i].value.indexOf(':Active') != -1) {
2261: document.forms.helpform.elements[i].checked=value;
2262: }
2263: }
2264: }
2265: }
2266: function checkactive() {
2267: for (i=0; i<document.forms.helpform.elements.length; i++) {
2268: if (document.forms.helpform.elements[i].value.indexOf(':Active') != -1) {
2269: document.forms.helpform.elements[i].checked=true;
2270: }
2271: }
2272: }
2273: function uncheckexpired() {
2274: for (i=0; i<document.forms.helpform.elements.length; i++) {
2275: if (document.forms.helpform.elements[i].value.indexOf(':Expired') != -1) {
2276: document.forms.helpform.elements[i].checked=false;
2277: }
2278: }
2279: }
2280: function getDesiredState() { // Return desired person state radio value.
2281: numRadio = document.forms.helpform.personstate.length;
2282: for (i =0; i < numRadio; i++) {
2283: if (document.forms.helpform.personstate[i].checked) {
2284: return document.forms.helpform.personstate[i].value;
2285: }
2286: }
2287: return "";
2288: }
2289:
2290: function checksections(value) { // Check selected sections.
2291: numSections = document.forms.helpform.chosensections.length;
2292: desiredState = getDesiredState();
2293:
2294: for (var option = 0; option < numSections; option++) {
2295: if(document.forms.helpform.chosensections.options[option].selected) {
2296: section = document.forms.helpform.chosensections.options[option].text;
2297: if (section == "none") {
2298: section ="";
2299: }
2300: for (i = 0; i < document.forms.helpform.elements.length; i++ ) {
2301: if (document.forms.helpform.elements[i].value.indexOf(':') != -1) {
2302: info = document.forms.helpform.elements[i].value.split(':');
2303: hisSection = info[2];
2304: hisState = info[4];
2305: if (desiredState == hisState ||
2306: desiredState == "All") {
2307: if(hisSection == section ||
2308: section =="" ) {
2309: document.forms.helpform.elements[i].checked = value;
2310: }
2311: }
2312: }
2313: }
2314: }
2315: }
2316: }
2317: // -->
2318: </script>
2319: SCRIPT
2320:
2321: my %lt=&Apache::lonlocal::texthash(
2322: 'ocs' => "Select Only Current Students",
2323: 'ues' => "Unselect Expired Students",
2324: 'sas' => "Select All Students",
2325: 'uas' => "Unselect All Students",
2326: 'sfsg' => "Select Current Students for Section/Group",
2327: 'ufsg' => "Unselect for Section/Group");
2328:
2329: $buttons = <<BUTTONS;
2330: <br />
2331: <table>
2332:
2333: <tr>
2334: <td><input type="button" onclick="checkall(true, '$var')" value="$lt{'sas'}" /></td>
2335: <td> <input type="button" onclick="checkall(false, '$var')" value="$lt{'uas'}" /><br /></td>
2336: </tr>
2337:
2338: </table>
2339: <br />
2340: BUTTONS
2341: }
2342:
2343: if (defined $self->{ERROR_MSG}) {
2344: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2345: }
2346:
2347: my $choices = [];
2348:
2349: # Load up the non-students, if necessary
2350: if ($self->{'coursepersonnel'}) {
2351: my %coursepersonnel = Apache::lonnet::get_course_adv_roles();
2352: for (sort keys %coursepersonnel) {
2353: for my $role (split /,/, $coursepersonnel{$_}) {
2354: # extract the names so we can sort them
2355: my @people;
2356:
2357: for (split /,/, $role) {
2358: push @people, [split /:/, $role];
2359: }
2360:
2361: @people = sort { $a->[0] cmp $b->[0] } @people;
2362:
2363: for my $person (@people) {
2364: push @$choices, [join(':', @$person), $person->[0], '', $_];
2365: }
2366: }
2367: }
2368: }
2369:
2370: # Constants
2371: my $section = Apache::loncoursedata::CL_SECTION();
2372: my $fullname = Apache::loncoursedata::CL_FULLNAME();
2373: my $status = Apache::loncoursedata::CL_STATUS();
2374:
2375: # Load up the students
2376: my $classlist = &Apache::loncoursedata::get_classlist();
2377: my @keys = keys %{$classlist};
2378: # Sort by: Section, name
2379: @keys = sort {
2380: if ($classlist->{$a}->[$section] ne $classlist->{$b}->[$section]) {
2381: return $classlist->{$a}->[$section] cmp $classlist->{$b}->[$section];
2382: }
2383: return $classlist->{$a}->[$fullname] cmp $classlist->{$b}->[$fullname];
2384: } @keys;
2385:
2386: # username, fullname, section, type
2387: for (@keys) {
2388: # Filter out inactive students if we've set "activeonly"
2389: if (!$self->{'activeonly'} || $classlist->{$_}->[$status] eq
2390: 'Active') {
2391: push @$choices, [$_, $classlist->{$_}->[$fullname],
2392: $classlist->{$_}->[$section],
2393: $classlist->{$_}->[$status], 'Student'];
2394: }
2395: }
2396:
2397: my $name = $self->{'coursepersonnel'} ? &mt('Name') : &mt('Student Name');
2398: my $type = 'radio';
2399: if ($self->{'multichoice'}) { $type = 'checkbox'; }
2400: $result .= "<table cellspacing='2' cellpadding='2' border='0'>\n";
2401: $result .= "<tr><td></td><td align='center'><b>$name</b></td>".
2402: "<td align='center'><b>" . &mt('Section') . "</b></td>" .
2403: "<td align='center'><b>".&mt('Status')."</b></td>" .
2404: "<td align='center'><b>" . &mt("Role") . "</b></td>" .
2405: "<td align='center'><b>".&mt('Username').":".&mt('Domain')."</b></td></tr>";
2406:
2407: my $checked = 0;
2408: for my $choice (@$choices) {
2409: $result .= "<tr><td><input type='$type' name='" .
2410: $self->{'variable'} . '.forminput' . "'";
2411:
2412: if (!$self->{'multichoice'} && !$checked) {
2413: $result .= " checked='checked' ";
2414: $checked = 1;
2415: }
2416: $result .=
2417: " value='" . HTML::Entities::encode($choice->[0] . ':'
2418: .$choice->[2] . ':'
2419: .$choice->[1] . ':'
2420: .$choice->[3], "<>&\"'")
2421: . "' /></td><td>"
2422: . HTML::Entities::encode($choice->[1],'<>&"')
2423: . "</td><td align='center'>"
2424: . HTML::Entities::encode($choice->[2],'<>&"')
2425: . "</td>\n<td>"
2426: . HTML::Entities::encode($choice->[3],'<>&"')
2427: . "</td>\n<td>"
2428: . HTML::Entities::encode($choice->[4],'<>&"')
2429: . "</td>\n<td>"
2430: . HTML::Entities::encode($choice->[0],'<>&"')
2431: . "</td></tr>\n";
2432: }
2433:
2434: $result .= "</table>\n\n";
2435: $result .= $buttons;
2436: #
2437: # now add the fancy section choice... first enumerate the sections:
2438: if ($self->{'multichoice'}) {
2439: my %sections;
2440: for my $key (@keys) {
2441: my $section_name = $classlist->{$key}->[$section];
2442: if ($section_name ne "") {
2443: $sections{$section_name} = 1;
2444: }
2445: }
2446: # The variable $choice_widget will have the html to make the choice
2447: # selector.
2448: my $size=5;
2449: if (scalar(keys(%sections)) < 5) {
2450: $size=scalar(keys(%sections));
2451: }
2452: my $choice_widget = '<select multiple name="chosensections" size="'.$size.'">'."\n";
2453: foreach my $sec (sort {lc($a) cmp lc($b)} (keys(%sections))) {
2454: $choice_widget .= "<option name=\"$sec\">$sec</option>\n";
2455: }
2456: $choice_widget .= "<option>none</option></select>\n";
2457:
2458: # Build a table without any borders to contain the section based
2459: # selection:
2460:
2461: my $section_selectors =<<SECTIONSELECT;
2462: <table border="0">
2463: <tr valign="top">
2464: <td>For Sections:</td><td>$choice_widget</td>
2465: <td><label><input type="radio" name="personstate" value="Active" checked />
2466: Current Students</label></td>
2467: <td><label><input type="radio" name="personstate" value="All" />
2468: All students</label></td>
2469: <td><label><input type="radio" name="personstate" value="Expired" />
2470: Expired Students</label></td>
2471: </tr>
2472: <tr>
2473: <td><input type="button" value="Select" onclick="checksections(true);" /></td>
2474: <td><input type="button" value="Unselect" onclick="checksections(false);" /></td></tr>
2475: </table>
2476: <br />
2477: SECTIONSELECT
2478: $result .= $section_selectors;
2479: }
2480: return $result;
2481: }
2482:
2483: sub postprocess {
2484: my $self = shift;
2485:
2486: my $result = $env{'form.' . $self->{'variable'} . '.forminput'};
2487: if (!$result) {
2488: $self->{ERROR_MSG} =
2489: &mt('You must choose at least one student to continue.');
2490: return 0;
2491: }
2492:
2493: if (defined($self->{NEXTSTATE})) {
2494: $helper->changeState($self->{NEXTSTATE});
2495: }
2496:
2497: return 1;
2498: }
2499:
2500: 1;
2501:
2502: package Apache::lonhelper::files;
2503:
2504: =pod
2505:
2506: =head2 Element: filesX<files, helper element>
2507:
2508: files allows the users to choose files from a given directory on the
2509: server. It is always multichoice and stores the result as a triple-pipe
2510: delimited entry in the helper variables.
2511:
2512: Since it is extremely unlikely that you can actually code a constant
2513: representing the directory you wish to allow the user to search, <files>
2514: takes a subroutine that returns the name of the directory you wish to
2515: have the user browse.
2516:
2517: files accepts the attribute "variable" to control where the files chosen
2518: are put. It accepts the attribute "multichoice" as the other attribute,
2519: defaulting to false, which if true will allow the user to select more
2520: then one choice.
2521:
2522: <files> accepts three subtags:
2523:
2524: =over 4
2525:
2526: =item * B<nextstate>: works as it does with the other tags.
2527:
2528: =item * B<filechoice>: When the contents of this tag are surrounded by
2529: "sub {" and "}", will return a string representing what directory
2530: on the server to allow the user to choose files from.
2531:
2532: =item * B<filefilter>: Should contain Perl code that when surrounded
2533: by "sub { my $filename = shift; " and "}", returns a true value if
2534: the user can pick that file, or false otherwise. The filename
2535: passed to the function will be just the name of the file, with no
2536: path info. By default, a filter function will be used that will
2537: mask out old versions of files. This function is available as
2538: Apache::lonhelper::files::not_old_version if you want to use it to
2539: composite your own filters.
2540:
2541: =back
2542:
2543: B<General security note>: You should ensure the user can not somehow
2544: pass something into your code that would allow them to look places
2545: they should not be able to see, like the C</etc/> directory. However,
2546: the security impact would be minimal, since it would only expose
2547: the existence of files, there should be no way to parlay that into
2548: viewing the files.
2549:
2550: =cut
2551:
2552: no strict;
2553: @ISA = ("Apache::lonhelper::element");
2554: use strict;
2555: use Apache::lonlocal;
2556: use Apache::lonnet;
2557: use Apache::lonpubdir; # for getTitleString
2558:
2559: BEGIN {
2560: &Apache::lonhelper::register('Apache::lonhelper::files',
2561: ('files', 'filechoice', 'filefilter'));
2562: }
2563:
2564: sub not_old_version {
2565: my $file = shift;
2566:
2567: # Given a file name, return false if it is an "old version" of a
2568: # file, or true if it is not.
2569:
2570: if ($file =~ /^.*\.[0-9]+\.[A-Za-z]+(\.meta)?$/) {
2571: return 0;
2572: }
2573: return 1;
2574: }
2575:
2576: sub new {
2577: my $ref = Apache::lonhelper::element->new();
2578: bless($ref);
2579: }
2580:
2581: sub start_files {
2582: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2583:
2584: if ($target ne 'helper') {
2585: return '';
2586: }
2587: $paramHash->{'variable'} = $token->[2]{'variable'};
2588: $helper->declareVar($paramHash->{'variable'});
2589: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2590: }
2591:
2592: sub end_files {
2593: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2594:
2595: if ($target ne 'helper') {
2596: return '';
2597: }
2598: if (!defined($paramHash->{FILTER_FUNC})) {
2599: $paramHash->{FILTER_FUNC} = sub { return 1; };
2600: }
2601: Apache::lonhelper::files->new();
2602: }
2603:
2604: sub start_filechoice {
2605: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2606:
2607: if ($target ne 'helper') {
2608: return '';
2609: }
2610: $paramHash->{'filechoice'} = Apache::lonxml::get_all_text('/filechoice',
2611: $parser);
2612: }
2613:
2614: sub end_filechoice { return ''; }
2615:
2616: sub start_filefilter {
2617: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2618:
2619: if ($target ne 'helper') {
2620: return '';
2621: }
2622:
2623: my $contents = Apache::lonxml::get_all_text('/filefilter',
2624: $parser);
2625: $contents = 'sub { my $filename = shift; ' . $contents . '}';
2626: $paramHash->{FILTER_FUNC} = eval $contents;
2627: }
2628:
2629: sub end_filefilter { return ''; }
2630:
2631: {
2632: # used to generate unique id attributes for <input> tags.
2633: # internal use only.
2634: my $id=0;
2635: sub new_id { return $id++;}
2636: }
2637:
2638: sub render {
2639: my $self = shift;
2640: my $result = '';
2641: my $var = $self->{'variable'};
2642:
2643: my $subdirFunc = eval('sub {' . $self->{'filechoice'} . '}');
2644: die 'Error in resource filter code for variable ' .
2645: {'variable'} . ', Perl said:' . $@ if $@;
2646:
2647: my $subdir = &$subdirFunc();
2648:
2649: my $filterFunc = $self->{FILTER_FUNC};
2650: if (!defined($filterFunc)) {
2651: $filterFunc = ¬_old_version;
2652: }
2653: my $buttons = '';
2654: my $type = 'radio';
2655: if ($self->{'multichoice'}) {
2656: $type = 'checkbox';
2657: }
2658:
2659: if ($self->{'multichoice'}) {
2660: $result = <<SCRIPT;
2661: <script type="text/javascript">
2662: // <!--
2663: function checkall(value, checkName) {
2664: for (i=0; i<document.forms.helpform.elements.length; i++) {
2665: ele = document.forms.helpform.elements[i];
2666: if (ele.name == checkName + '.forminput') {
2667: document.forms.helpform.elements[i].checked=value;
2668: }
2669: }
2670: }
2671:
2672: function checkallclass(value, className) {
2673: for (i=0; i<document.forms.helpform.elements.length; i++) {
2674: ele = document.forms.helpform.elements[i];
2675: if (ele.type == "$type" && ele.onclick) {
2676: document.forms.helpform.elements[i].checked=value;
2677: }
2678: }
2679: }
2680: // -->
2681: </script>
2682: SCRIPT
2683: my %lt=&Apache::lonlocal::texthash(
2684: 'saf' => "Select All Files",
2685: 'uaf' => "Unselect All Files");
2686: $buttons = <<BUTTONS;
2687: <br />
2688: <input type="button" onclick="checkall(true, '$var')" value="$lt{'saf'}" />
2689: <input type="button" onclick="checkall(false, '$var')" value="$lt{'uaf'}" />
2690: BUTTONS
2691:
2692: %lt=&Apache::lonlocal::texthash(
2693: 'sap' => "Select All Published",
2694: 'uap' => "Unselect All Published");
2695: if ($helper->{VARS}->{'construction'}) {
2696: $buttons .= <<BUTTONS;
2697: <input type="button" onclick="checkallclass(true, 'Published')" value="$lt{'sap'}" />
2698: <input type="button" onclick="checkallclass(false, 'Published')" value="$lt{'uap'}" />
2699: <br />
2700: BUTTONS
2701: }
2702: }
2703:
2704: # Get the list of files in this directory.
2705: my @fileList;
2706:
2707: # If the subdirectory is in local CSTR space
2708: my $metadir;
2709: if ($subdir =~ m|/home/([^/]+)/public_html/(.*)|) {
2710: my ($user,$domain)=
2711: &Apache::loncacc::constructaccess($subdir,
2712: $Apache::lonnet::perlvar{'lonDefDomain'});
2713: $metadir='/res/'.$domain.'/'.$user.'/'.$2;
2714: @fileList = &Apache::lonnet::dirlist($subdir, $domain, $user, '');
2715: } elsif ($subdir =~ m|^~([^/]+)/(.*)$|) {
2716: $subdir='/home/'.$1.'/public_html/'.$2;
2717: my ($user,$domain)=
2718: &Apache::loncacc::constructaccess($subdir,
2719: $Apache::lonnet::perlvar{'lonDefDomain'});
2720: $metadir='/res/'.$domain.'/'.$user.'/'.$2;
2721: @fileList = &Apache::lonnet::dirlist($subdir, $domain, $user, '');
2722: } else {
2723: # local library server resource space
2724: @fileList = &Apache::lonnet::dirlist($subdir, $env{'user.domain'}, $env{'user.name'}, '');
2725: }
2726:
2727: # Sort the fileList into order
2728: @fileList = sort {lc($a) cmp lc($b)} @fileList;
2729:
2730: $result .= $buttons;
2731:
2732: if (defined $self->{ERROR_MSG}) {
2733: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2734: }
2735:
2736: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
2737:
2738: # Keeps track if there are no choices, prints appropriate error
2739: # if there are none.
2740: my $choices = 0;
2741: # Print each legitimate file choice.
2742: for my $file (@fileList) {
2743: $file = (split(/&/, $file))[0];
2744: if ($file eq '.' || $file eq '..') {
2745: next;
2746: }
2747: my $fileName = $subdir .'/'. $file;
2748: if (&$filterFunc($file)) {
2749: my $status;
2750: my $color;
2751: if ($helper->{VARS}->{'construction'}) {
2752: ($status, $color) = @{fileState($subdir, $file)};
2753: } else {
2754: $status = '';
2755: $color = '';
2756: }
2757:
2758: # Get the title
2759: my $title = Apache::lonpubdir::getTitleString(($metadir?$metadir:$subdir) .'/'. $file);
2760:
2761: # Netscape 4 is stupid and there's nowhere to put the
2762: # information on the input tag that the file is Published,
2763: # Unpublished, etc. In *real* browsers we can just say
2764: # "class='Published'" and check the className attribute of
2765: # the input tag, but Netscape 4 is too stupid to understand
2766: # that attribute, and un-comprehended attributes are not
2767: # reflected into the object model. So instead, what I do
2768: # is either have or don't have an "onclick" handler that
2769: # does nothing, give Published files the onclick handler, and
2770: # have the checker scripts check for that. Stupid and clumsy,
2771: # and only gives us binary "yes/no" information (at least I
2772: # couldn't figure out how to reach into the event handler's
2773: # actual code to retreive a value), but it works well enough
2774: # here.
2775:
2776: my $onclick = '';
2777: if ($status eq 'Published' && $helper->{VARS}->{'construction'}) {
2778: $onclick = 'onclick="a=1" ';
2779: }
2780: my $id = &new_id();
2781: $result .= '<tr><td align="right"' . " bgcolor='$color'>" .
2782: "<input $onclick type='$type' name='" . $var
2783: . ".forminput' ".qq{id="$id"}." value='" . HTML::Entities::encode($fileName,"<>&\"'").
2784: "'";
2785: if (!$self->{'multichoice'} && $choices == 0) {
2786: $result .= ' checked="checked"';
2787: }
2788: $result .= "/></td><td bgcolor='$color'>".
2789: qq{<label for="$id">}. $file . "</label></td>" .
2790: "<td bgcolor='$color'>$title</td>" .
2791: "<td bgcolor='$color'>$status</td>" . "</tr>\n";
2792: $choices++;
2793: }
2794: }
2795:
2796: $result .= "</table>\n";
2797:
2798: if (!$choices) {
2799: $result .= '<font color="#FF0000">There are no files available to select in this directory ('.$subdir.'). Please go back and select another option.</font><br /><br />';
2800: }
2801:
2802: $result .= $buttons;
2803:
2804: return $result;
2805: }
2806:
2807: # Determine the state of the file: Published, unpublished, modified.
2808: # Return the color it should be in and a label as a two-element array
2809: # reference.
2810: # Logic lifted from lonpubdir.pm, even though I don't know that it's still
2811: # the most right thing to do.
2812:
2813: sub fileState {
2814: my $constructionSpaceDir = shift;
2815: my $file = shift;
2816:
2817: my ($uname,$udom)=($env{'user.name'},$env{'user.domain'});
2818: if ($env{'request.role'}=~/^ca\./) {
2819: (undef,$udom,$uname)=split(/\//,$env{'request.role'});
2820: }
2821: my $docroot = $Apache::lonnet::perlvar{'lonDocRoot'};
2822: my $subdirpart = $constructionSpaceDir;
2823: $subdirpart =~ s/^\/home\/$uname\/public_html//;
2824: my $resdir = $docroot . '/res/' . $udom . '/' . $uname .
2825: $subdirpart;
2826:
2827: my @constructionSpaceFileStat = stat($constructionSpaceDir . '/' . $file);
2828: my @resourceSpaceFileStat = stat($resdir . '/' . $file);
2829: if (!@resourceSpaceFileStat) {
2830: return ['Unpublished', '#FFCCCC'];
2831: }
2832:
2833: my $constructionSpaceFileModified = $constructionSpaceFileStat[9];
2834: my $resourceSpaceFileModified = $resourceSpaceFileStat[9];
2835:
2836: if ($constructionSpaceFileModified > $resourceSpaceFileModified) {
2837: return ['Modified', '#FFFFCC'];
2838: }
2839: return ['Published', '#CCFFCC'];
2840: }
2841:
2842: sub postprocess {
2843: my $self = shift;
2844: my $result = $env{'form.' . $self->{'variable'} . '.forminput'};
2845: if (!$result) {
2846: $self->{ERROR_MSG} = 'You must choose at least one file '.
2847: 'to continue.';
2848: return 0;
2849: }
2850:
2851: if (defined($self->{NEXTSTATE})) {
2852: $helper->changeState($self->{NEXTSTATE});
2853: }
2854:
2855: return 1;
2856: }
2857:
2858: 1;
2859:
2860: package Apache::lonhelper::section;
2861:
2862: =pod
2863:
2864: =head2 Element: sectionX<section, helper element>
2865:
2866: <section> allows the user to choose one or more sections from the current
2867: course.
2868:
2869: It takes the standard attributes "variable", "multichoice", and
2870: "nextstate", meaning what they do for most other elements.
2871:
2872: =cut
2873:
2874: no strict;
2875: @ISA = ("Apache::lonhelper::choices");
2876: use strict;
2877:
2878: BEGIN {
2879: &Apache::lonhelper::register('Apache::lonhelper::section',
2880: ('section'));
2881: }
2882:
2883: sub new {
2884: my $ref = Apache::lonhelper::choices->new();
2885: bless($ref);
2886: }
2887:
2888: sub start_section {
2889: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2890:
2891: if ($target ne 'helper') {
2892: return '';
2893: }
2894:
2895: $paramHash->{CHOICES} = [];
2896:
2897: $paramHash->{'variable'} = $token->[2]{'variable'};
2898: $helper->declareVar($paramHash->{'variable'});
2899: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2900: if (defined($token->[2]{'nextstate'})) {
2901: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2902: }
2903:
2904: # Populate the CHOICES element
2905: my %choices;
2906:
2907: my $section = Apache::loncoursedata::CL_SECTION();
2908: my $classlist = Apache::loncoursedata::get_classlist();
2909: foreach (keys %$classlist) {
2910: my $sectionName = $classlist->{$_}->[$section];
2911: if (!$sectionName) {
2912: $choices{"No section assigned"} = "";
2913: } else {
2914: $choices{$sectionName} = $sectionName;
2915: }
2916: }
2917:
2918: for my $sectionName (sort(keys(%choices))) {
2919:
2920: push @{$paramHash->{CHOICES}}, [$sectionName, $sectionName];
2921: }
2922: }
2923:
2924: sub end_section {
2925: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2926:
2927: if ($target ne 'helper') {
2928: return '';
2929: }
2930: Apache::lonhelper::section->new();
2931: }
2932: 1;
2933:
2934: package Apache::lonhelper::string;
2935:
2936: =pod
2937:
2938: =head2 Element: stringX<string, helper element>
2939:
2940: string elements provide a string entry field for the user. string elements
2941: take the usual 'variable' and 'nextstate' parameters. string elements
2942: also pass through 'maxlength' and 'size' attributes to the input tag.
2943:
2944: string honors the defaultvalue tag, if given.
2945:
2946: string honors the validation function, if given.
2947:
2948: =cut
2949:
2950: no strict;
2951: @ISA = ("Apache::lonhelper::element");
2952: use strict;
2953: use Apache::lonlocal;
2954:
2955: BEGIN {
2956: &Apache::lonhelper::register('Apache::lonhelper::string',
2957: ('string'));
2958: }
2959:
2960: sub new {
2961: my $ref = Apache::lonhelper::element->new();
2962: bless($ref);
2963: }
2964:
2965: # CONSTRUCTION: Construct the message element from the XML
2966: sub start_string {
2967: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2968:
2969: if ($target ne 'helper') {
2970: return '';
2971: }
2972:
2973: $paramHash->{'variable'} = $token->[2]{'variable'};
2974: $helper->declareVar($paramHash->{'variable'});
2975: $paramHash->{'nextstate'} = $token->[2]{'nextstate'};
2976: $paramHash->{'maxlength'} = $token->[2]{'maxlength'};
2977: $paramHash->{'size'} = $token->[2]{'size'};
2978:
2979: return '';
2980: }
2981:
2982: sub end_string {
2983: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2984:
2985: if ($target ne 'helper') {
2986: return '';
2987: }
2988: Apache::lonhelper::string->new();
2989: return '';
2990: }
2991:
2992: sub render {
2993: my $self = shift;
2994: my $result = '';
2995:
2996: if (defined $self->{ERROR_MSG}) {
2997: $result .= '<p><font color="#FF0000">' . $self->{ERROR_MSG} . '</font></p>';
2998: }
2999:
3000: $result .= '<input type="string" name="' . $self->{'variable'} . '.forminput"';
3001:
3002: if (defined($self->{'size'})) {
3003: $result .= ' size="' . $self->{'size'} . '"';
3004: }
3005: if (defined($self->{'maxlength'})) {
3006: $result .= ' maxlength="' . $self->{'maxlength'} . '"';
3007: }
3008:
3009: if (defined($self->{DEFAULT_VALUE})) {
3010: my $valueFunc = eval($self->{DEFAULT_VALUE});
3011: die 'Error in default value code for variable ' .
3012: $self->{'variable'} . ', Perl said: ' . $@ if $@;
3013: $result .= ' value="' . &$valueFunc($helper, $self) . '"';
3014: }
3015:
3016: $result .= ' />';
3017:
3018: return $result;
3019: }
3020:
3021: # If a NEXTSTATE was given, switch to it
3022: sub postprocess {
3023: my $self = shift;
3024:
3025: if (defined($self->{VALIDATOR})) {
3026: my $validator = eval($self->{VALIDATOR});
3027: die 'Died during evaluation of evaulation code; Perl said: ' . $@ if $@;
3028: my $invalid = &$validator($helper, $state, $self, $self->getValue());
3029: if ($invalid) {
3030: $self->{ERROR_MSG} = $invalid;
3031: return 0;
3032: }
3033: }
3034:
3035: if (defined($self->{'nextstate'})) {
3036: $helper->changeState($self->{'nextstate'});
3037: }
3038:
3039: return 1;
3040: }
3041:
3042: 1;
3043:
3044: package Apache::lonhelper::general;
3045:
3046: =pod
3047:
3048: =head2 General-purpose tag: <exec>X<exec, helper tag>
3049:
3050: The contents of the exec tag are executed as Perl code, B<not> inside a
3051: safe space, so the full range of $env and such is available. The code
3052: will be executed as a subroutine wrapped with the following code:
3053:
3054: "sub { my $helper = shift; my $state = shift;" and
3055:
3056: "}"
3057:
3058: The return value is ignored.
3059:
3060: $helper is the helper object. Feel free to add methods to the helper
3061: object to support whatever manipulation you may need to do (for instance,
3062: overriding the form location if the state is the final state; see
3063: parameter.helper for an example).
3064:
3065: $state is the $paramHash that has currently been generated and may
3066: be manipulated by the code in exec. Note that the $state is not yet
3067: an actual state B<object>, it is just a hash, so do not expect to
3068: be able to call methods on it.
3069:
3070: =cut
3071:
3072: use Apache::lonlocal;
3073: use Apache::lonnet;
3074:
3075: BEGIN {
3076: &Apache::lonhelper::register('Apache::lonhelper::general',
3077: 'exec', 'condition', 'clause',
3078: 'eval');
3079: }
3080:
3081: sub start_exec {
3082: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3083:
3084: if ($target ne 'helper') {
3085: return '';
3086: }
3087:
3088: my $code = &Apache::lonxml::get_all_text('/exec', $parser);
3089:
3090: $code = eval ('sub { my $helper = shift; my $state = shift; ' .
3091: $code . "}");
3092: die 'Error in <exec>, Perl said: '. $@ if $@;
3093: &$code($helper, $paramHash);
3094: }
3095:
3096: sub end_exec { return ''; }
3097:
3098: =pod
3099:
3100: =head2 General-purpose tag: <condition>
3101:
3102: The <condition> tag allows you to mask out parts of the helper code
3103: depending on some programatically determined condition. The condition
3104: tag contains a tag <clause> which contains perl code that when wrapped
3105: with "sub { my $helper = shift; my $state = shift; " and "}", returns
3106: a true value if the XML in the condition should be evaluated as a normal
3107: part of the helper, or false if it should be completely discarded.
3108:
3109: The <clause> tag must be the first sub-tag of the <condition> tag or
3110: it will not work as expected.
3111:
3112: =cut
3113:
3114: # The condition tag just functions as a marker, it doesn't have
3115: # to "do" anything. Technically it doesn't even have to be registered
3116: # with the lonxml code, but I leave this here to be explicit about it.
3117: sub start_condition { return ''; }
3118: sub end_condition { return ''; }
3119:
3120: sub start_clause {
3121: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3122:
3123: if ($target ne 'helper') {
3124: return '';
3125: }
3126:
3127: my $clause = Apache::lonxml::get_all_text('/clause', $parser);
3128: $clause = eval('sub { my $helper = shift; my $state = shift; '
3129: . $clause . '}');
3130: die 'Error in clause of condition, Perl said: ' . $@ if $@;
3131: if (!&$clause($helper, $paramHash)) {
3132: # Discard all text until the /condition.
3133: &Apache::lonxml::get_all_text('/condition', $parser);
3134: }
3135: }
3136:
3137: sub end_clause { return ''; }
3138:
3139: =pod
3140:
3141: =head2 General-purpose tag: <eval>X<eval, helper tag>
3142:
3143: The <eval> tag will be evaluated as a subroutine call passed in the
3144: current helper object and state hash as described in <condition> above,
3145: but is expected to return a string to be printed directly to the
3146: screen. This is useful for dynamically generating messages.
3147:
3148: =cut
3149:
3150: # This is basically a type of message.
3151: # Programmatically setting $paramHash->{NEXTSTATE} would work, though
3152: # it's probably bad form.
3153:
3154: sub start_eval {
3155: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3156:
3157: if ($target ne 'helper') {
3158: return '';
3159: }
3160:
3161: my $program = Apache::lonxml::get_all_text('/eval', $parser);
3162: $program = eval('sub { my $helper = shift; my $state = shift; '
3163: . $program . '}');
3164: die 'Error in eval code, Perl said: ' . $@ if $@;
3165: $paramHash->{MESSAGE_TEXT} = &$program($helper, $paramHash);
3166: }
3167:
3168: sub end_eval {
3169: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3170:
3171: if ($target ne 'helper') {
3172: return '';
3173: }
3174:
3175: Apache::lonhelper::message->new();
3176: }
3177:
3178: 1;
3179:
3180: package Apache::lonhelper::final;
3181:
3182: =pod
3183:
3184: =head2 Element: finalX<final, helper tag>
3185:
3186: <final> is a special element that works with helpers that use the <finalcode>
3187: tagX<finalcode, helper tag>. It goes through all the states and elements, executing the <finalcode>
3188: snippets and collecting the results. Finally, it takes the user out of the
3189: helper, going to a provided page.
3190:
3191: If the parameter "restartCourse" is true, this will override the buttons and
3192: will make a "Finish Helper" button that will re-initialize the course for them,
3193: which is useful for the Course Initialization helper so the users never see
3194: the old values taking effect.
3195:
3196: If the parameter "restartCourse" is not true a 'Finish' Button will be
3197: presented that takes the user back to whatever was defined as <exitpage>
3198:
3199: =cut
3200:
3201: no strict;
3202: @ISA = ("Apache::lonhelper::element");
3203: use strict;
3204: use Apache::lonlocal;
3205: use Apache::lonnet;
3206: BEGIN {
3207: &Apache::lonhelper::register('Apache::lonhelper::final',
3208: ('final', 'exitpage'));
3209: }
3210:
3211: sub new {
3212: my $ref = Apache::lonhelper::element->new();
3213: bless($ref);
3214: }
3215:
3216: sub start_final {
3217: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3218:
3219: if ($target ne 'helper') {
3220: return '';
3221: }
3222:
3223: $paramHash->{'restartCourse'} = $token->[2]{'restartCourse'};
3224:
3225: return '';
3226: }
3227:
3228: sub end_final {
3229: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3230:
3231: if ($target ne 'helper') {
3232: return '';
3233: }
3234:
3235: Apache::lonhelper::final->new();
3236:
3237: return '';
3238: }
3239:
3240: sub start_exitpage {
3241: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3242:
3243: if ($target ne 'helper') {
3244: return '';
3245: }
3246:
3247: $paramHash->{EXIT_PAGE} = &Apache::lonxml::get_all_text('/exitpage',
3248: $parser);
3249:
3250: return '';
3251: }
3252:
3253: sub end_exitpage { return ''; }
3254:
3255: sub render {
3256: my $self = shift;
3257:
3258: my @results;
3259:
3260: # Collect all the results
3261: for my $stateName (keys %{$helper->{STATES}}) {
3262: my $state = $helper->{STATES}->{$stateName};
3263:
3264: for my $element (@{$state->{ELEMENTS}}) {
3265: if (defined($element->{FINAL_CODE})) {
3266: # Compile the code.
3267: my $code = 'sub { my $helper = shift; my $element = shift; '
3268: . $element->{FINAL_CODE} . '}';
3269: $code = eval($code);
3270: die 'Error while executing final code for element with var ' .
3271: $element->{'variable'} . ', Perl said: ' . $@ if $@;
3272:
3273: my $result = &$code($helper, $element);
3274: if ($result) {
3275: push @results, $result;
3276: }
3277: }
3278: }
3279: }
3280:
3281: my $result;
3282:
3283: if (scalar(@results) != 0) {
3284: $result .= "<ul>\n";
3285: for my $re (@results) {
3286: $result .= ' <li>' . $re . "</li>\n";
3287: }
3288:
3289: if (!@results) {
3290: $result .= ' <li>' .
3291: &mt('No changes were made to current settings.') . '</li>';
3292: }
3293:
3294: $result .= '</ul>';
3295: }
3296:
3297: my $actionURL = $self->{EXIT_PAGE};
3298: my $targetURL = '';
3299: my $finish=&mt('Finish');
3300: if ($self->{'restartCourse'}) {
3301: $actionURL = '/adm/roles';
3302: $targetURL = '/adm/menu';
3303: if ($env{'course.'.$env{'request.course.id'}.'.url'}=~/^uploaded/) {
3304: $targetURL = '/adm/coursedocs';
3305: } else {
3306: $targetURL = '/adm/navmaps';
3307: }
3308: if ($env{'course.'.$env{'request.course.id'}.'.clonedfrom'}) {
3309: $targetURL = '/adm/parmset?overview=1';
3310: }
3311: my $finish=&mt('Finish Course Initialization');
3312: }
3313: my $previous = HTML::Entities::encode(&mt("<- Previous"), '<>&"');
3314: my $next = HTML::Entities::encode(&mt("Next ->"), '<>&"');
3315: $result .= "<center>\n" .
3316: "<form action='".$actionURL."' method='post' target='loncapaclient'>\n" .
3317: "<input type='button' onclick='history.go(-1)' value='$previous' />" .
3318: "<input type='hidden' name='orgurl' value='$targetURL' />" .
3319: "<input type='hidden' name='selectrole' value='1' />\n" .
3320: "<input type='hidden' name='" . $env{'request.role'} .
3321: "' value='1' />\n<input type='submit' value='" . $finish . "' />\n" .
3322: "</form></center>";
3323:
3324: return $result;
3325: }
3326:
3327: sub overrideForm {
3328: return 1;
3329: }
3330:
3331: 1;
3332:
3333: package Apache::lonhelper::parmwizfinal;
3334:
3335: # This is the final state for the parmwizard. It is not generally useful,
3336: # so it is not perldoc'ed. It does its own processing.
3337: # It is represented with <parmwizfinal />, and
3338: # should later be moved to lonparmset.pm .
3339:
3340: no strict;
3341: @ISA = ('Apache::lonhelper::element');
3342: use strict;
3343: use Apache::lonlocal;
3344: use Apache::lonnet;
3345:
3346: BEGIN {
3347: &Apache::lonhelper::register('Apache::lonhelper::parmwizfinal',
3348: ('parmwizfinal'));
3349: }
3350:
3351: use Time::localtime;
3352:
3353: sub new {
3354: my $ref = Apache::lonhelper::choices->new();
3355: bless ($ref);
3356: }
3357:
3358: sub start_parmwizfinal { return ''; }
3359:
3360: sub end_parmwizfinal {
3361: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3362:
3363: if ($target ne 'helper') {
3364: return '';
3365: }
3366: Apache::lonhelper::parmwizfinal->new();
3367: }
3368:
3369: # Renders a form that, when submitted, will form the input to lonparmset.pm
3370: sub render {
3371: my $self = shift;
3372: my $vars = $helper->{VARS};
3373:
3374: # FIXME: Unify my designators with the standard ones
3375: my %dateTypeHash = ('open_date' => "opening date",
3376: 'due_date' => "due date",
3377: 'answer_date' => "answer date",
3378: 'tries' => 'number of tries',
3379: 'weight' => 'problem weight'
3380: );
3381: my %parmTypeHash = ('open_date' => "0_opendate",
3382: 'due_date' => "0_duedate",
3383: 'answer_date' => "0_answerdate",
3384: 'tries' => '0_maxtries',
3385: 'weight' => '0_weight' );
3386: my %realParmName = ('open_date' => "opendate",
3387: 'due_date' => "duedate",
3388: 'answer_date' => "answerdate",
3389: 'tries' => 'maxtries',
3390: 'weight' => 'weight' );
3391:
3392: my $affectedResourceId = "";
3393: my $parm_name = $parmTypeHash{$vars->{ACTION_TYPE}};
3394: my $level = "";
3395: my $resourceString;
3396: my $symb;
3397: my $paramlevel;
3398:
3399: # Print the granularity, depending on the action
3400: if ($vars->{GRANULARITY} eq 'whole_course') {
3401: $resourceString .= '<li>'.&mt('for <b>all resources in the course</b>').'</li>';
3402: if ($vars->{TARGETS} eq 'course') {
3403: $level = 11; # general course, see lonparmset.pm perldoc
3404: } elsif ($vars->{TARGETS} eq 'section') {
3405: $level = 6;
3406: } else {
3407: $level = 3;
3408: }
3409: $affectedResourceId = "0.0";
3410: $symb = 'a';
3411: $paramlevel = 'general';
3412: } elsif ($vars->{GRANULARITY} eq 'map') {
3413: my $navmap = Apache::lonnavmaps::navmap->new();
3414: my $res = $navmap->getByMapPc($vars->{RESOURCE_ID});
3415: my $title = $res->compTitle();
3416: $symb = $res->symb();
3417: $resourceString .= '<li>'.&mt('for the map named [_1]',"<b>$title</b>").'</li>';
3418: if ($vars->{TARGETS} eq 'course') {
3419: $level = 10; # general course, see lonparmset.pm perldoc
3420: } elsif ($vars->{TARGETS} eq 'section') {
3421: $level = 5;
3422: } else {
3423: $level = 2;
3424: }
3425: $affectedResourceId = $vars->{RESOURCE_ID};
3426: $paramlevel = 'map';
3427: } else {
3428: my $navmap = Apache::lonnavmaps::navmap->new();
3429: my $res = $navmap->getById($vars->{RESOURCE_ID});
3430: my $part = $vars->{RESOURCE_ID_part};
3431: if ($part ne 'All Parts' && $part) { $parm_name=~s/^0/$part/; } else { $part=&mt('All Parts'); }
3432: $symb = $res->symb();
3433: my $title = $res->compTitle();
3434: $resourceString .= '<li>'.&mt('for the resource named [_1] part [_2]',"<b>$title</b>","<b>$part</b>").'</li>';
3435: if ($vars->{TARGETS} eq 'course') {
3436: $level = 7; # general course, see lonparmset.pm perldoc
3437: } elsif ($vars->{TARGETS} eq 'section') {
3438: $level = 4;
3439: } else {
3440: $level = 1;
3441: }
3442: $affectedResourceId = $vars->{RESOURCE_ID};
3443: $paramlevel = 'full';
3444: }
3445:
3446: my $result = "<form name='helpform' method='POST' action='/adm/parmset#$affectedResourceId&$parm_name&$level'>\n";
3447: $result .= "<input type='hidden' name='action' value='settable' />\n";
3448: $result .= "<input type='hidden' name='dis' value='helper' />\n";
3449: $result .= "<input type='hidden' name='pscat' value='".
3450: $realParmName{$vars->{ACTION_TYPE}}."' />\n";
3451: if ($vars->{GRANULARITY} eq 'resource') {
3452: $result .= "<input type='hidden' name='symb' value='".
3453: HTML::Entities::encode($symb,"'<>&\"") . "' />\n";
3454: } elsif ($vars->{GRANULARITY} eq 'map') {
3455: $result .= "<input type='hidden' name='pschp' value='".
3456: $affectedResourceId."' />\n";
3457: }
3458: my $part = $vars->{RESOURCE_ID_part};
3459: if ($part eq 'All Parts' || !$part) { $part=0; }
3460: $result .= "<input type='hidden' name='psprt' value='".
3461: HTML::Entities::encode($part,"'<>&\"") . "' />\n";
3462:
3463: $result .= '<p>'.&mt('Confirm that this information is correct, then click "Finish Helper" to complete setting the parameter.').'<ul>';
3464:
3465: # Print the type of manipulation:
3466: my $extra;
3467: if ($vars->{ACTION_TYPE} eq 'tries') {
3468: $extra = $vars->{TRIES};
3469: }
3470: if ($vars->{ACTION_TYPE} eq 'weight') {
3471: $extra = $vars->{WEIGHT};
3472: }
3473: $result .= "<li>";
3474: my $what = &mt($dateTypeHash{$vars->{ACTION_TYPE}});
3475: if ($extra) {
3476: $result .= &mt('Setting the [_1] to [_2]',"<b>$what</b>",$extra);
3477: } else {
3478: $result .= &mt('Setting the [_1]',"<b>$what</b>");
3479: }
3480: $result .= "</li>\n";
3481: if ($vars->{ACTION_TYPE} eq 'due_date' ||
3482: $vars->{ACTION_TYPE} eq 'answer_date') {
3483: # for due dates, we default to "date end" type entries
3484: $result .= "<input type='hidden' name='recent_date_end' " .
3485: "value='" . $vars->{PARM_DATE} . "' />\n";
3486: $result .= "<input type='hidden' name='pres_value' " .
3487: "value='" . $vars->{PARM_DATE} . "' />\n";
3488: $result .= "<input type='hidden' name='pres_type' " .
3489: "value='date_end' />\n";
3490: } elsif ($vars->{ACTION_TYPE} eq 'open_date') {
3491: $result .= "<input type='hidden' name='recent_date_start' ".
3492: "value='" . $vars->{PARM_DATE} . "' />\n";
3493: $result .= "<input type='hidden' name='pres_value' " .
3494: "value='" . $vars->{PARM_DATE} . "' />\n";
3495: $result .= "<input type='hidden' name='pres_type' " .
3496: "value='date_start' />\n";
3497: } elsif ($vars->{ACTION_TYPE} eq 'tries') {
3498: $result .= "<input type='hidden' name='pres_value' " .
3499: "value='" . $vars->{TRIES} . "' />\n";
3500: $result .= "<input type='hidden' name='pres_type' " .
3501: "value='int_pos' />\n";
3502: } elsif ($vars->{ACTION_TYPE} eq 'weight') {
3503: $result .= "<input type='hidden' name='pres_value' " .
3504: "value='" . $vars->{WEIGHT} . "' />\n";
3505: }
3506:
3507: $result .= $resourceString;
3508:
3509: # Print targets
3510: if ($vars->{TARGETS} eq 'course') {
3511: $result .= '<li>'.&mt('for <b>all students in course</b>').'</li>';
3512: } elsif ($vars->{TARGETS} eq 'section') {
3513: my $section = $vars->{SECTION_NAME};
3514: $result .= '<li>'.&mt('for section [_1]',"<b>$section</b>").'</li>';
3515: $result .= "<input type='hidden' name='csec' value='" .
3516: HTML::Entities::encode($section,"'<>&\"") . "' />\n";
3517: } else {
3518: # FIXME: This is probably wasteful! Store the name!
3519: my $classlist = Apache::loncoursedata::get_classlist();
3520: my ($uname,$udom)=split(':',$vars->{USER_NAME});
3521: my $name = $classlist->{$uname.':'.$udom}->[6];
3522: $result .= '<li>'.&mt('for [_1]',"<b>$name</b>").'</li>';
3523: $result .= "<input type='hidden' name='uname' value='".
3524: HTML::Entities::encode($uname,"'<>&\"") . "' />\n";
3525: $result .= "<input type='hidden' name='udom' value='".
3526: HTML::Entities::encode($udom,"'<>&\"") . "' />\n";
3527: }
3528:
3529: # Print value
3530: if ($vars->{ACTION_TYPE} ne 'tries' && $vars->{ACTION_TYPE} ne 'weight') {
3531: $result .= '<li>'.&mt('to [_1] ([_2])',"<b>".ctime($vars->{PARM_DATE})."</b>",Apache::lonnavmaps::timeToHumanString($vars->{PARM_DATE}))."</li>\n";
3532: }
3533:
3534: # print pres_marker
3535: $result .= "\n<input type='hidden' name='pres_marker'" .
3536: " value='$affectedResourceId&$parm_name&$level' />\n";
3537:
3538: # Make the table appear
3539: $result .= "\n<input type='hidden' value='true' name='prevvisit' />";
3540: $result .= "\n<input type='hidden' value='$symb' name='pssymb' />";
3541: $result .= "\n<input type='hidden' value='$paramlevel' name='parmlev' />";
3542:
3543: $result .= "<br /><br /><center><input type='submit' value='".&mt('Finish Helper')."' /></center></form>\n";
3544:
3545: return $result;
3546: }
3547:
3548: sub overrideForm {
3549: return 1;
3550: }
3551:
3552: 1;
3553:
3554: __END__
3555:
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