Annotation of loncom/interface/lonhelper.pm, revision 1.18
1.1 bowersj2 1: # The LearningOnline Network with CAPA
2: # .helper XML handler to implement the LON-CAPA helper
3: #
1.14 bowersj2 4: # $Id: lonhelper.pm,v 1.13 2003/04/30 15:18:36 bowersj2 Exp $
1.1 bowersj2 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: # (Page Handler
29: #
30: # (.helper handler
31: #
32:
1.3 bowersj2 33: =pod
34:
35: =head1 lonhelper - HTML Helper framework for LON-CAPA
36:
37: Helpers, often known as "wizards", are well-established UI widgets that users
38: feel comfortable with. It can take a complicated multidimensional problem the
39: user has and turn it into a series of bite-sized one-dimensional questions.
40:
41: For developers, helpers provide an easy way to bundle little bits of functionality
42: for the user, without having to write the tedious state-maintenence code.
43:
44: Helpers are defined as XML documents, placed in the /home/httpd/html/adm/helpers
45: directory and having the .helper file extension. For examples, see that directory.
46:
47: All classes are in the Apache::lonhelper namespace.
48:
49: =head2 lonhelper XML file format
50:
51: A helper consists of a top-level <helper> tag which contains a series of states.
52: Each state contains one or more state elements, which are what the user sees, like
53: messages, resource selections, or date queries.
54:
55: The helper tag is required to have one attribute, "title", which is the name
56: of the helper itself, such as "Parameter helper".
57:
58: =head2 State tags
59:
60: State tags are required to have an attribute "name", which is the symbolic
1.7 bowersj2 61: name of the state and will not be directly seen by the user. The helper is
62: required to have one state named "START", which is the state the helper
1.5 bowersj2 63: will start with. By convention, this state should clearly describe what
1.3 bowersj2 64: the helper will do for the user, and may also include the first information
65: entry the user needs to do for the helper.
66:
67: State tags are also required to have an attribute "title", which is the
68: human name of the state, and will be displayed as the header on top of
69: the screen for the user.
70:
71: =head2 Example Helper Skeleton
72:
73: An example of the tags so far:
74:
75: <helper title="Example Helper">
76: <state name="START" title="Demonstrating the Example Helper">
77: <!-- notice this is the START state the wizard requires -->
78: </state>
79: <state name="GET_NAME" title="Enter Student Name">
80: </state>
81: </helper>
82:
83: Of course this does nothing. In order for the wizard to do something, it is
84: necessary to put actual elements into the wizard. Documentation for each
85: of these elements follows.
86:
1.13 bowersj2 87: =head2 Creating a Helper With Code, Not XML
88:
89: In some situations, such as the printing wizard (see lonprintout.pm),
90: writing the helper in XML would be too complicated, because of scope
91: issues or the fact that the code actually outweighs the XML. It is
92: possible to create a helper via code, though it is a little odd.
93:
94: Creating a helper via code is more like issuing commands to create
95: a helper then normal code writing. For instance, elements will automatically
96: be added to the last state created, so it's important to create the
97: states in the correct order.
98:
99: First, create a new helper:
100:
101: use Apache::lonhelper;
102:
103: my $helper = Apache::lonhelper::new->("Helper Title");
104:
105: Next you'll need to manually add states to the helper:
106:
107: Apache::lonhelper::state->new("STATE_NAME", "State's Human Title");
108:
109: You don't need to save a reference to it because all elements up until
110: the next state creation will automatically be added to this state.
111:
112: Elements are created by populating the $paramHash in
113: Apache::lonhelper::paramhash. To prevent namespace issues, retrieve
114: a reference to that has with getParamHash:
115:
116: my $paramHash = Apache::lonhelper::getParamHash();
117:
118: You will need to do this for each state you create.
119:
120: Populate the $paramHash with the parameters for the element you wish
121: to add next; the easiest way to find out what those entries are is
122: to read the code. Some common ones are 'variable' to record the variable
123: to store the results in, and NEXTSTATE to record a next state transition.
124:
125: Then create your element:
126:
127: $paramHash->{MESSAGETEXT} = "This is a message.";
128: Apache::lonhelper::message->new();
129:
130: The creation will take the $paramHash and bless it into a
131: Apache::lonhelper::message object. To create the next element, you need
132: to get a reference to the new, empty $paramHash:
133:
134: $paramHash = Apache::lonhelper::getParamHash();
135:
136: and you can repeat creating elements that way. You can add states
137: and elements as needed.
138:
139: See lonprintout.pm, subroutine printHelper for an example of this, where
140: we dynamically add some states to prevent security problems, for instance.
141:
142: Normally the machinery in the XML format is sufficient; dynamically
143: adding states can easily be done by wrapping the state in a <condition>
144: tag. This should only be used when the code dominates the XML content,
145: the code is so complicated that it is difficult to get access to
146: all of the information you need because of scoping issues, or so much
147: of the information used is persistent because would-be <exec> or
148: <eval> blocks that using the {DATA} mechanism results in hard-to-read
149: and -maintain code.
150:
151: It is possible to do some of the work with an XML fragment parsed by
1.17 bowersj2 152: lonxml; again, see lonprintout.pm for an example. In that case it is
153: imperative that you call B<Apache::lonhelper::registerHelperTags()>
154: before parsing XML fragments and B<Apache::lonhelper::unregisterHelperTags()>
155: when you are done. See lonprintout.pm for examples of this usage in the
156: printHelper subroutine.
1.13 bowersj2 157:
1.3 bowersj2 158: =cut
159:
1.1 bowersj2 160: package Apache::lonhelper;
1.2 bowersj2 161: use Apache::Constants qw(:common);
162: use Apache::File;
1.3 bowersj2 163: use Apache::lonxml;
1.2 bowersj2 164:
1.7 bowersj2 165: # Register all the tags with the helper, so the helper can
166: # push and pop them
167:
168: my @helperTags;
169:
170: sub register {
171: my ($namespace, @tags) = @_;
172:
173: for my $tag (@tags) {
174: push @helperTags, [$namespace, $tag];
175: }
176: }
177:
1.2 bowersj2 178: BEGIN {
1.7 bowersj2 179: Apache::lonxml::register('Apache::lonhelper',
180: ('helper'));
181: register('Apache::lonhelper', ('state'));
1.2 bowersj2 182: }
183:
1.7 bowersj2 184: # Since all helpers are only three levels deep (helper tag, state tag,
1.3 bowersj2 185: # substate type), it's easier and more readble to explicitly track
186: # those three things directly, rather then futz with the tag stack
187: # every time.
188: my $helper;
189: my $state;
190: my $substate;
1.4 bowersj2 191: # To collect parameters, the contents of the subtags are collected
192: # into this paramHash, then passed to the element object when the
193: # end of the element tag is located.
194: my $paramHash;
1.2 bowersj2 195:
1.13 bowersj2 196: # For debugging purposes, one can send a second parameter into this
197: # function, the 'uri' of the helper you wish to have rendered, and
198: # call this from other handlers.
1.2 bowersj2 199: sub handler {
1.3 bowersj2 200: my $r = shift;
1.13 bowersj2 201: my $uri = shift;
202: if (!defined($uri)) { $uri = $r->uri(); }
203: $ENV{'request.uri'} = $uri;
204: my $filename = '/home/httpd/html' . $uri;
1.2 bowersj2 205: my $fh = Apache::File->new($filename);
206: my $file;
1.3 bowersj2 207: read $fh, $file, 100000000;
208:
209: # Send header, don't cache this page
210: if ($r->header_only) {
211: if ($ENV{'browser.mathml'}) {
212: $r->content_type('text/xml');
213: } else {
214: $r->content_type('text/html');
215: }
216: $r->send_http_header;
217: return OK;
218: }
219: if ($ENV{'browser.mathml'}) {
220: $r->content_type('text/xml');
221: } else {
222: $r->content_type('text/html');
223: }
224: $r->send_http_header;
225: $r->rflush();
1.2 bowersj2 226:
1.3 bowersj2 227: # Discard result, we just want the objects that get created by the
228: # xml parsing
229: &Apache::lonxml::xmlparse($r, 'helper', $file);
1.2 bowersj2 230:
1.13 bowersj2 231: $helper->process();
232:
1.3 bowersj2 233: $r->print($helper->display());
1.7 bowersj2 234: return OK;
1.2 bowersj2 235: }
236:
1.13 bowersj2 237: sub registerHelperTags {
238: for my $tagList (@helperTags) {
239: Apache::lonxml::register($tagList->[0], $tagList->[1]);
240: }
241: }
242:
243: sub unregisterHelperTags {
244: for my $tagList (@helperTags) {
245: Apache::lonxml::deregister($tagList->[0], $tagList->[1]);
246: }
247: }
248:
1.2 bowersj2 249: sub start_helper {
250: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
251:
252: if ($target ne 'helper') {
253: return '';
254: }
1.7 bowersj2 255:
1.13 bowersj2 256: registerHelperTags();
257:
258: Apache::lonhelper::helper->new($token->[2]{'title'});
1.4 bowersj2 259: return '';
1.2 bowersj2 260: }
261:
262: sub end_helper {
263: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
264:
1.3 bowersj2 265: if ($target ne 'helper') {
266: return '';
267: }
1.7 bowersj2 268:
1.13 bowersj2 269: unregisterHelperTags();
1.7 bowersj2 270:
1.4 bowersj2 271: return '';
1.2 bowersj2 272: }
1.1 bowersj2 273:
1.3 bowersj2 274: sub start_state {
275: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
276:
277: if ($target ne 'helper') {
278: return '';
279: }
280:
1.13 bowersj2 281: Apache::lonhelper::state->new($token->[2]{'name'},
282: $token->[2]{'title'});
1.3 bowersj2 283: return '';
284: }
285:
1.13 bowersj2 286: # Use this to get the param hash from other files.
287: sub getParamHash {
288: return $paramHash;
289: }
290:
291: # Use this to get the helper, if implementing elements in other files
292: # (like lonprintout.pm)
293: sub getHelper {
294: return $helper;
295: }
296:
1.3 bowersj2 297: # don't need this, so ignore it
298: sub end_state {
299: return '';
300: }
301:
1.1 bowersj2 302: 1;
303:
1.3 bowersj2 304: package Apache::lonhelper::helper;
305:
306: use Digest::MD5 qw(md5_hex);
307: use HTML::Entities;
308: use Apache::loncommon;
309: use Apache::File;
310:
311: sub new {
312: my $proto = shift;
313: my $class = ref($proto) || $proto;
314: my $self = {};
315:
316: $self->{TITLE} = shift;
317:
318: # If there is a state from the previous form, use that. If there is no
319: # state, use the start state parameter.
320: if (defined $ENV{"form.CURRENT_STATE"})
321: {
322: $self->{STATE} = $ENV{"form.CURRENT_STATE"};
323: }
324: else
325: {
326: $self->{STATE} = "START";
327: }
328:
1.14 bowersj2 329: Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
330:
1.3 bowersj2 331: $self->{TOKEN} = $ENV{'form.TOKEN'};
332: # If a token was passed, we load that in. Otherwise, we need to create a
333: # new storage file
334: # Tried to use standard Tie'd hashes, but you can't seem to take a
335: # reference to a tied hash and write to it. I'd call that a wart.
336: if ($self->{TOKEN}) {
337: # Validate the token before trusting it
338: if ($self->{TOKEN} !~ /^[a-f0-9]{32}$/) {
339: # Not legit. Return nothing and let all hell break loose.
340: # User shouldn't be doing that!
341: return undef;
342: }
343:
344: # Get the hash.
345: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN}); # Note the token is not the literal file
346:
347: my $file = Apache::File->new($self->{FILENAME});
348: my $contents = <$file>;
1.5 bowersj2 349:
350: # Now load in the contents
351: for my $value (split (/&/, $contents)) {
352: my ($name, $value) = split(/=/, $value);
353: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
354: $self->{VARS}->{$name} = $value;
355: }
356:
1.3 bowersj2 357: $file->close();
358: } else {
359: # Only valid if we're just starting.
360: if ($self->{STATE} ne 'START') {
361: return undef;
362: }
363: # Must create the storage
364: $self->{TOKEN} = md5_hex($ENV{'user.name'} . $ENV{'user.domain'} .
365: time() . rand());
366: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN});
367: }
368:
369: # OK, we now have our persistent storage.
370:
371: if (defined $ENV{"form.RETURN_PAGE"})
372: {
373: $self->{RETURN_PAGE} = $ENV{"form.RETURN_PAGE"};
374: }
375: else
376: {
377: $self->{RETURN_PAGE} = $ENV{REFERER};
378: }
379:
380: $self->{STATES} = {};
381: $self->{DONE} = 0;
382:
1.9 bowersj2 383: # Used by various helpers for various things; see lonparm.helper
384: # for an example.
385: $self->{DATA} = {};
386:
1.13 bowersj2 387: $helper = $self;
388:
389: # Establish the $paramHash
390: $paramHash = {};
391:
1.3 bowersj2 392: bless($self, $class);
393: return $self;
394: }
395:
396: # Private function; returns a string to construct the hidden fields
397: # necessary to have the helper track state.
398: sub _saveVars {
399: my $self = shift;
400: my $result = "";
401: $result .= '<input type="hidden" name="CURRENT_STATE" value="' .
402: HTML::Entities::encode($self->{STATE}) . "\" />\n";
403: $result .= '<input type="hidden" name="TOKEN" value="' .
404: $self->{TOKEN} . "\" />\n";
405: $result .= '<input type="hidden" name="RETURN_PAGE" value="' .
406: HTML::Entities::encode($self->{RETURN_PAGE}) . "\" />\n";
407:
408: return $result;
409: }
410:
411: # Private function: Create the querystring-like representation of the stored
412: # data to write to disk.
413: sub _varsInFile {
414: my $self = shift;
415: my @vars = ();
416: for my $key (keys %{$self->{VARS}}) {
417: push @vars, &Apache::lonnet::escape($key) . '=' .
418: &Apache::lonnet::escape($self->{VARS}->{$key});
419: }
420: return join ('&', @vars);
421: }
422:
1.5 bowersj2 423: # Use this to declare variables.
424: # FIXME: Document this
425: sub declareVar {
426: my $self = shift;
427: my $var = shift;
428:
429: if (!defined($self->{VARS}->{$var})) {
430: $self->{VARS}->{$var} = '';
431: }
432:
433: my $envname = 'form.' . $var . '.forminput';
434: if (defined($ENV{$envname})) {
435: $self->{VARS}->{$var} = $ENV{$envname};
436: }
437: }
438:
1.3 bowersj2 439: sub changeState {
440: my $self = shift;
441: $self->{STATE} = shift;
442: }
443:
444: sub registerState {
445: my $self = shift;
446: my $state = shift;
447:
448: my $stateName = $state->name();
449: $self->{STATES}{$stateName} = $state;
450: }
451:
1.13 bowersj2 452: sub process {
1.3 bowersj2 453: my $self = shift;
454:
455: # Phase 1: Post processing for state of previous screen (which is actually
456: # the "current state" in terms of the helper variables), if it wasn't the
457: # beginning state.
458: if ($self->{STATE} ne "START" || $ENV{"form.SUBMIT"} eq "Next ->") {
459: my $prevState = $self->{STATES}{$self->{STATE}};
1.13 bowersj2 460: $prevState->postprocess();
1.3 bowersj2 461: }
462:
463: # Note, to handle errors in a state's input that a user must correct,
464: # do not transition in the postprocess, and force the user to correct
465: # the error.
466:
467: # Phase 2: Preprocess current state
468: my $startState = $self->{STATE};
1.17 bowersj2 469: my $state = $self->{STATES}->{$startState};
1.3 bowersj2 470:
1.13 bowersj2 471: # For debugging, print something here to determine if you're going
472: # to an undefined state.
1.3 bowersj2 473: if (!defined($state)) {
1.13 bowersj2 474: return;
1.3 bowersj2 475: }
476: $state->preprocess();
477:
478: # Phase 3: While the current state is different from the previous state,
479: # keep processing.
1.17 bowersj2 480: while ( $startState ne $self->{STATE} &&
481: defined($self->{STATES}->{$self->{STATE}}) )
1.3 bowersj2 482: {
483: $startState = $self->{STATE};
1.17 bowersj2 484: $state = $self->{STATES}->{$startState};
1.3 bowersj2 485: $state->preprocess();
486: }
487:
1.13 bowersj2 488: return;
489: }
490:
491: # 1: Do the post processing for the previous state.
492: # 2: Do the preprocessing for the current state.
493: # 3: Check to see if state changed, if so, postprocess current and move to next.
494: # Repeat until state stays stable.
495: # 4: Render the current state to the screen as an HTML page.
496: sub display {
497: my $self = shift;
498:
499: my $state = $self->{STATES}{$self->{STATE}};
500:
501: my $result = "";
502:
1.17 bowersj2 503: if (!defined($state)) {
504: $result = "<font color='#ff0000'>Error: state '$state' not defined!</font>";
505: return $result;
506: }
507:
1.3 bowersj2 508: # Phase 4: Display.
509: my $stateTitle = $state->title();
510: my $bodytag = &Apache::loncommon::bodytag("$self->{TITLE}",'','');
511:
512: $result .= <<HEADER;
513: <html>
514: <head>
515: <title>LON-CAPA Helper: $self->{TITLE}</title>
516: </head>
517: $bodytag
518: HEADER
1.14 bowersj2 519: if (!$state->overrideForm()) { $result.="<form name='helpform' method='GET'>"; }
1.3 bowersj2 520: $result .= <<HEADER;
521: <table border="0"><tr><td>
522: <h2><i>$stateTitle</i></h2>
523: HEADER
524:
525: if (!$state->overrideForm()) {
526: $result .= $self->_saveVars();
527: }
528: $result .= $state->render() . "<p> </p>";
529:
530: if (!$state->overrideForm()) {
531: $result .= '<center>';
532: if ($self->{STATE} ne $self->{START_STATE}) {
533: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
534: }
535: if ($self->{DONE}) {
536: my $returnPage = $self->{RETURN_PAGE};
537: $result .= "<a href=\"$returnPage\">End Helper</a>";
538: }
539: else {
540: $result .= '<input name="back" type="button" ';
541: $result .= 'value="<- Previous" onclick="history.go(-1)" /> ';
542: $result .= '<input name="SUBMIT" type="submit" value="Next ->" />';
543: }
544: $result .= "</center>\n";
545: }
546:
1.13 bowersj2 547: #foreach my $key (keys %{$self->{VARS}}) {
548: # $result .= "|$key| -> " . $self->{VARS}->{$key} . "<br />";
549: #}
1.5 bowersj2 550:
1.3 bowersj2 551: $result .= <<FOOTER;
552: </td>
553: </tr>
554: </table>
555: </form>
556: </body>
557: </html>
558: FOOTER
559:
560: # Handle writing out the vars to the file
561: my $file = Apache::File->new('>'.$self->{FILENAME});
562: print $file $self->_varsInFile();
563:
564: return $result;
565: }
566:
567: 1;
568:
569: package Apache::lonhelper::state;
570:
571: # States bundle things together and are responsible for compositing the
1.4 bowersj2 572: # various elements together. It is not generally necessary for users to
573: # use the state object directly, so it is not perldoc'ed.
574:
575: # Basically, all the states do is pass calls to the elements and aggregate
576: # the results.
1.3 bowersj2 577:
578: sub new {
579: my $proto = shift;
580: my $class = ref($proto) || $proto;
581: my $self = {};
582:
583: $self->{NAME} = shift;
584: $self->{TITLE} = shift;
585: $self->{ELEMENTS} = [];
586:
587: bless($self, $class);
588:
589: $helper->registerState($self);
590:
1.13 bowersj2 591: $state = $self;
592:
1.3 bowersj2 593: return $self;
594: }
595:
596: sub name {
597: my $self = shift;
598: return $self->{NAME};
599: }
600:
601: sub title {
602: my $self = shift;
603: return $self->{TITLE};
604: }
605:
1.4 bowersj2 606: sub preprocess {
607: my $self = shift;
608: for my $element (@{$self->{ELEMENTS}}) {
609: $element->preprocess();
610: }
611: }
612:
1.6 bowersj2 613: # FIXME: Document that all postprocesses must return a true value or
614: # the state transition will be overridden
1.4 bowersj2 615: sub postprocess {
616: my $self = shift;
1.6 bowersj2 617:
618: # Save the state so we can roll it back if we need to.
619: my $originalState = $helper->{STATE};
620: my $everythingSuccessful = 1;
621:
1.4 bowersj2 622: for my $element (@{$self->{ELEMENTS}}) {
1.6 bowersj2 623: my $result = $element->postprocess();
624: if (!$result) { $everythingSuccessful = 0; }
625: }
626:
627: # If not all the postprocesses were successful, override
628: # any state transitions that may have occurred. It is the
629: # responsibility of the states to make sure they have
630: # error handling in that case.
631: if (!$everythingSuccessful) {
632: $helper->{STATE} = $originalState;
1.4 bowersj2 633: }
634: }
635:
1.13 bowersj2 636: # Override the form if any element wants to.
637: # two elements overriding the form will make a mess, but that should
638: # be considered helper author error ;-)
1.4 bowersj2 639: sub overrideForm {
1.13 bowersj2 640: my $self = shift;
641: for my $element (@{$self->{ELEMENTS}}) {
642: if ($element->overrideForm()) {
643: return 1;
644: }
645: }
1.4 bowersj2 646: return 0;
647: }
648:
649: sub addElement {
650: my $self = shift;
651: my $element = shift;
652:
653: push @{$self->{ELEMENTS}}, $element;
654: }
655:
656: sub render {
657: my $self = shift;
658: my @results = ();
659:
660: for my $element (@{$self->{ELEMENTS}}) {
661: push @results, $element->render();
662: }
663: return join("\n", @results);
664: }
665:
666: 1;
667:
668: package Apache::lonhelper::element;
669: # Support code for elements
670:
671: =pod
672:
673: =head2 Element Base Class
674:
675: The Apache::lonhelper::element base class provides support methods for
676: the elements to use, such as a multiple value processer.
677:
678: B<Methods>:
679:
680: =over 4
681:
682: =item * process_multiple_choices(formName, varName): Process the form
683: element named "formName" and place the selected items into the helper
684: variable named varName. This is for things like checkboxes or
685: multiple-selection listboxes where the user can select more then
686: one entry. The selected entries are delimited by triple pipes in
1.5 bowersj2 687: the helper variables, like this:
688:
689: CHOICE_1|||CHOICE_2|||CHOICE_3
1.4 bowersj2 690:
691: =back
692:
693: =cut
694:
1.5 bowersj2 695: BEGIN {
1.7 bowersj2 696: &Apache::lonhelper::register('Apache::lonhelper::element',
697: ('nextstate'));
1.5 bowersj2 698: }
699:
1.4 bowersj2 700: # Because we use the param hash, this is often a sufficent
701: # constructor
702: sub new {
703: my $proto = shift;
704: my $class = ref($proto) || $proto;
705: my $self = $paramHash;
706: bless($self, $class);
707:
708: $self->{PARAMS} = $paramHash;
709: $self->{STATE} = $state;
710: $state->addElement($self);
711:
712: # Ensure param hash is not reused
713: $paramHash = {};
714:
715: return $self;
716: }
717:
1.5 bowersj2 718: sub start_nextstate {
719: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
720:
721: if ($target ne 'helper') {
722: return '';
723: }
724:
725: $paramHash->{NEXTSTATE} = &Apache::lonxml::get_all_text('/nextstate',
726: $parser);
727: return '';
728: }
729:
730: sub end_nextstate { return ''; }
731:
1.4 bowersj2 732: sub preprocess {
733: return 1;
734: }
735:
736: sub postprocess {
737: return 1;
738: }
739:
740: sub render {
741: return '';
742: }
743:
1.13 bowersj2 744: sub overrideForm {
745: return 0;
746: }
747:
1.3 bowersj2 748: sub process_multiple_choices {
749: my $self = shift;
750: my $formname = shift;
751: my $var = shift;
752:
1.14 bowersj2 753: # Must extract values from data directly, as there
754: # may be more then one.
755: my @values;
756: for my $formparam (split (/&/, $ENV{QUERY_STRING})) {
757: my ($name, $value) = split(/=/, $formparam);
758: if ($name ne $formname) {
759: next;
1.3 bowersj2 760: }
1.14 bowersj2 761: $value =~ tr/+/ /;
762: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
763: push @values, $value;
1.3 bowersj2 764: }
1.14 bowersj2 765: $helper->{VARS}->{$var} = join('|||', @values);
1.3 bowersj2 766:
767: return;
768: }
769:
1.4 bowersj2 770: 1;
771:
772: package Apache::lonhelper::message;
773:
774: =pod
775:
776: =head2 Element: message
777:
778: Message elements display the contents of their <message_text> tags, and
1.5 bowersj2 779: transition directly to the state in the <nextstate> tag. Example:
1.4 bowersj2 780:
781: <message>
1.5 bowersj2 782: <nextstate>GET_NAME</nextstate>
1.4 bowersj2 783: <message_text>This is the <b>message</b> the user will see,
784: <i>HTML allowed</i>.</message_text>
785: </message>
786:
1.5 bowersj2 787: This will display the HTML message and transition to the <nextstate> if
1.7 bowersj2 788: given. The HTML will be directly inserted into the helper, so if you don't
1.4 bowersj2 789: want text to run together, you'll need to manually wrap the <message_text>
790: in <p> tags, or whatever is appropriate for your HTML.
791:
1.5 bowersj2 792: Message tags do not add in whitespace, so if you want it, you'll need to add
793: it into states. This is done so you can inline some elements, such as
794: the <date> element, right between two messages, giving the appearence that
795: the <date> element appears inline. (Note the elements can not be embedded
796: within each other.)
797:
1.4 bowersj2 798: This is also a good template for creating your own new states, as it has
799: very little code beyond the state template.
800:
801: =cut
802:
803: no strict;
804: @ISA = ("Apache::lonhelper::element");
805: use strict;
806:
807: BEGIN {
1.7 bowersj2 808: &Apache::lonhelper::register('Apache::lonhelper::message',
1.10 bowersj2 809: ('message'));
1.3 bowersj2 810: }
811:
1.5 bowersj2 812: sub new {
813: my $ref = Apache::lonhelper::element->new();
814: bless($ref);
815: }
1.4 bowersj2 816:
817: # CONSTRUCTION: Construct the message element from the XML
818: sub start_message {
819: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
820:
821: if ($target ne 'helper') {
822: return '';
823: }
1.10 bowersj2 824:
825: $paramHash->{MESSAGE_TEXT} = &Apache::lonxml::get_all_text('/message',
826: $parser);
827:
828: if (defined($token->[2]{'nextstate'})) {
829: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
830: }
1.4 bowersj2 831: return '';
1.3 bowersj2 832: }
833:
1.10 bowersj2 834: sub end_message {
1.4 bowersj2 835: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
836:
837: if ($target ne 'helper') {
838: return '';
839: }
1.10 bowersj2 840: Apache::lonhelper::message->new();
841: return '';
1.5 bowersj2 842: }
843:
844: sub render {
845: my $self = shift;
846:
847: return $self->{MESSAGE_TEXT};
848: }
849: # If a NEXTSTATE was given, switch to it
850: sub postprocess {
851: my $self = shift;
852: if (defined($self->{NEXTSTATE})) {
853: $helper->changeState($self->{NEXTSTATE});
854: }
1.6 bowersj2 855:
856: return 1;
1.5 bowersj2 857: }
858: 1;
859:
860: package Apache::lonhelper::choices;
861:
862: =pod
863:
864: =head2 Element: choices
865:
866: Choice states provide a single choice to the user as a text selection box.
867: A "choice" is two pieces of text, one which will be displayed to the user
868: (the "human" value), and one which will be passed back to the program
869: (the "computer" value). For instance, a human may choose from a list of
870: resources on disk by title, while your program wants the file name.
871:
872: <choices> takes an attribute "variable" to control which helper variable
873: the result is stored in.
874:
875: <choices> takes an attribute "multichoice" which, if set to a true
876: value, will allow the user to select multiple choices.
877:
878: B<SUB-TAGS>
879:
880: <choices> can have the following subtags:
881:
882: =over 4
883:
884: =item * <nextstate>state_name</nextstate>: If given, this will cause the
885: choice element to transition to the given state after executing. If
886: this is used, do not pass nextstates to the <choice> tag.
887:
888: =item * <choice />: If the choices are static,
889: this element will allow you to specify them. Each choice
890: contains attribute, "computer", as described above. The
891: content of the tag will be used as the human label.
892: For example,
893: <choice computer='234-12-7312'>Bobby McDormik</choice>.
894:
1.13 bowersj2 895: <choice> can take a parameter "eval", which if set to
896: a true value, will cause the contents of the tag to be
897: evaluated as it would be in an <eval> tag; see <eval> tag
898: below.
899:
1.5 bowersj2 900: <choice> may optionally contain a 'nextstate' attribute, which
901: will be the state transisitoned to if the choice is made, if
902: the choice is not multichoice.
903:
904: =back
905:
906: To create the choices programmatically, either wrap the choices in
907: <condition> tags (prefered), or use an <exec> block inside the <choice>
908: tag. Store the choices in $state->{CHOICES}, which is a list of list
909: references, where each list has three strings. The first is the human
910: name, the second is the computer name. and the third is the option
911: next state. For example:
912:
913: <exec>
914: for (my $i = 65; $i < 65 + 26; $i++) {
915: push @{$state->{CHOICES}}, [chr($i), $i, 'next'];
916: }
917: </exec>
918:
919: This will allow the user to select from the letters A-Z (in ASCII), while
920: passing the ASCII value back into the helper variables, and the state
921: will in all cases transition to 'next'.
922:
923: You can mix and match methods of creating choices, as long as you always
924: "push" onto the choice list, rather then wiping it out. (You can even
925: remove choices programmatically, but that would probably be bad form.)
926:
927: =cut
928:
929: no strict;
930: @ISA = ("Apache::lonhelper::element");
931: use strict;
932:
933: BEGIN {
1.7 bowersj2 934: &Apache::lonhelper::register('Apache::lonhelper::choices',
1.5 bowersj2 935: ('choice', 'choices'));
936: }
937:
938: sub new {
939: my $ref = Apache::lonhelper::element->new();
940: bless($ref);
941: }
942:
943: # CONSTRUCTION: Construct the message element from the XML
944: sub start_choices {
945: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
946:
947: if ($target ne 'helper') {
948: return '';
949: }
950:
951: # Need to initialize the choices list, so everything can assume it exists
952: $paramHash->{'variable'} = $token->[2]{'variable'};
953: $helper->declareVar($paramHash->{'variable'});
954: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
955: $paramHash->{CHOICES} = [];
956: return '';
957: }
958:
959: sub end_choices {
960: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
961:
962: if ($target ne 'helper') {
963: return '';
964: }
965: Apache::lonhelper::choices->new();
966: return '';
967: }
968:
969: sub start_choice {
970: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
971:
972: if ($target ne 'helper') {
973: return '';
974: }
975:
976: my $computer = $token->[2]{'computer'};
977: my $human = &Apache::lonxml::get_all_text('/choice',
978: $parser);
979: my $nextstate = $token->[2]{'nextstate'};
1.13 bowersj2 980: my $evalFlag = $token->[2]{'eval'};
981: push @{$paramHash->{CHOICES}}, [$human, $computer, $nextstate,
982: $evalFlag];
1.5 bowersj2 983: return '';
984: }
985:
986: sub end_choice {
987: return '';
988: }
989:
990: sub render {
991: # START HERE: Replace this with correct choices code.
992: my $self = shift;
993: my $var = $self->{'variable'};
994: my $buttons = '';
995: my $result = '';
996:
997: if ($self->{'multichoice'}) {
1.6 bowersj2 998: $result .= <<SCRIPT;
1.5 bowersj2 999: <script>
1.18 ! bowersj2 1000: function checkall(value, checkName) {
1.15 bowersj2 1001: for (i=0; i<document.forms.helpform.elements.length; i++) {
1.18 ! bowersj2 1002: ele = document.forms.helpform.elements[i];
! 1003: if (ele.name == checkName + '.forminput') {
! 1004: document.forms.helpform.elements[i].checked=value;
! 1005: }
1.5 bowersj2 1006: }
1007: }
1008: </script>
1009: SCRIPT
1010: $buttons = <<BUTTONS;
1011: <br />
1.18 ! bowersj2 1012: <input type="button" onclick="checkall(true, '$var')" value="Select All" />
! 1013: <input type="button" onclick="checkall(false, '$var')" value="Unselect All" />
1.6 bowersj2 1014: <br />
1.5 bowersj2 1015: BUTTONS
1016: }
1017:
1.16 bowersj2 1018: if (defined $self->{ERROR_MSG}) {
1.6 bowersj2 1019: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1.5 bowersj2 1020: }
1021:
1022: $result .= $buttons;
1.6 bowersj2 1023:
1.5 bowersj2 1024: $result .= "<table>\n\n";
1025:
1026: my $type = "radio";
1027: if ($self->{'multichoice'}) { $type = 'checkbox'; }
1028: my $checked = 0;
1029: foreach my $choice (@{$self->{CHOICES}}) {
1030: $result .= "<tr>\n<td width='20'> </td>\n";
1031: $result .= "<td valign='top'><input type='$type' name='$var.forminput'"
1032: . "' value='" .
1033: HTML::Entities::encode($choice->[1])
1034: . "'";
1035: if (!$self->{'multichoice'} && !$checked) {
1036: $result .= " checked ";
1037: $checked = 1;
1038: }
1.13 bowersj2 1039: my $choiceLabel = $choice->[0];
1040: if ($choice->[4]) { # if we need to evaluate this choice
1041: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1042: $choiceLabel . "}";
1043: $choiceLabel = eval($choiceLabel);
1044: $choiceLabel = &$choiceLabel($helper, $self);
1045: }
1046: $result .= "/></td><td> " . $choiceLabel . "</td></tr>\n";
1.5 bowersj2 1047: }
1048: $result .= "</table>\n\n\n";
1049: $result .= $buttons;
1050:
1051: return $result;
1052: }
1053:
1054: # If a NEXTSTATE was given or a nextstate for this choice was
1055: # given, switch to it
1056: sub postprocess {
1057: my $self = shift;
1058: my $chosenValue = $ENV{'form.' . $self->{'variable'} . '.forminput'};
1059:
1.6 bowersj2 1060: if (!$chosenValue) {
1061: $self->{ERROR_MSG} = "You must choose one or more choices to" .
1062: " continue.";
1063: return 0;
1064: }
1065:
1066: if ($self->{'multichoice'}) {
1067: $self->process_multiple_choices($self->{'variable'}.'.forminput',
1068: $self->{'variable'});
1069: }
1070:
1.5 bowersj2 1071: if (defined($self->{NEXTSTATE})) {
1072: $helper->changeState($self->{NEXTSTATE});
1073: }
1074:
1075: foreach my $choice (@{$self->{CHOICES}}) {
1076: if ($choice->[1] eq $chosenValue) {
1077: if (defined($choice->[2])) {
1078: $helper->changeState($choice->[2]);
1079: }
1080: }
1081: }
1.6 bowersj2 1082: return 1;
1.5 bowersj2 1083: }
1084: 1;
1085:
1086: package Apache::lonhelper::date;
1087:
1088: =pod
1089:
1090: =head2 Element: date
1091:
1092: Date elements allow the selection of a date with a drop down list.
1093:
1094: Date elements can take two attributes:
1095:
1096: =over 4
1097:
1098: =item * B<variable>: The name of the variable to store the chosen
1099: date in. Required.
1100:
1101: =item * B<hoursminutes>: If a true value, the date will show hours
1102: and minutes, as well as month/day/year. If false or missing,
1103: the date will only show the month, day, and year.
1104:
1105: =back
1106:
1107: Date elements contain only an option <nextstate> tag to determine
1108: the next state.
1109:
1110: Example:
1111:
1112: <date variable="DUE_DATE" hoursminutes="1">
1113: <nextstate>choose_why</nextstate>
1114: </date>
1115:
1116: =cut
1117:
1118: no strict;
1119: @ISA = ("Apache::lonhelper::element");
1120: use strict;
1121:
1122: use Time::localtime;
1123:
1124: BEGIN {
1.7 bowersj2 1125: &Apache::lonhelper::register('Apache::lonhelper::date',
1.5 bowersj2 1126: ('date'));
1127: }
1128:
1129: # Don't need to override the "new" from element
1130: sub new {
1131: my $ref = Apache::lonhelper::element->new();
1132: bless($ref);
1133: }
1134:
1135: my @months = ("January", "February", "March", "April", "May", "June", "July",
1136: "August", "September", "October", "November", "December");
1137:
1138: # CONSTRUCTION: Construct the message element from the XML
1139: sub start_date {
1140: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1141:
1142: if ($target ne 'helper') {
1143: return '';
1144: }
1145:
1146: $paramHash->{'variable'} = $token->[2]{'variable'};
1147: $helper->declareVar($paramHash->{'variable'});
1148: $paramHash->{'hoursminutes'} = $token->[2]{'hoursminutes'};
1149: }
1150:
1151: sub end_date {
1152: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1153:
1154: if ($target ne 'helper') {
1155: return '';
1156: }
1157: Apache::lonhelper::date->new();
1158: return '';
1159: }
1160:
1161: sub render {
1162: my $self = shift;
1163: my $result = "";
1164: my $var = $self->{'variable'};
1165:
1166: my $date;
1167:
1168: # Default date: The current hour.
1169: $date = localtime();
1170: $date->min(0);
1171:
1172: if (defined $self->{ERROR_MSG}) {
1173: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1174: }
1175:
1176: # Month
1177: my $i;
1178: $result .= "<select name='${var}month'>\n";
1179: for ($i = 0; $i < 12; $i++) {
1180: if ($i == $date->mon) {
1181: $result .= "<option value='$i' selected>";
1182: } else {
1183: $result .= "<option value='$i'>";
1184: }
1185: $result .= $months[$i] . "</option>\n";
1186: }
1187: $result .= "</select>\n";
1188:
1189: # Day
1190: $result .= "<select name='${var}day'>\n";
1191: for ($i = 1; $i < 32; $i++) {
1192: if ($i == $date->mday) {
1193: $result .= '<option selected>';
1194: } else {
1195: $result .= '<option>';
1196: }
1197: $result .= "$i</option>\n";
1198: }
1199: $result .= "</select>,\n";
1200:
1201: # Year
1202: $result .= "<select name='${var}year'>\n";
1203: for ($i = 2000; $i < 2030; $i++) { # update this after 64-bit dates
1204: if ($date->year + 1900 == $i) {
1205: $result .= "<option selected>";
1206: } else {
1207: $result .= "<option>";
1208: }
1209: $result .= "$i</option>\n";
1210: }
1211: $result .= "</select>,\n";
1212:
1213: # Display Hours and Minutes if they are called for
1214: if ($self->{'hoursminutes'}) {
1215: # Build hour
1216: $result .= "<select name='${var}hour'>\n";
1217: $result .= "<option " . ($date->hour == 0 ? 'selected ':'') .
1218: " value='0'>midnight</option>\n";
1219: for ($i = 1; $i < 12; $i++) {
1220: if ($date->hour == $i) {
1221: $result .= "<option selected value='$i'>$i a.m.</option>\n";
1222: } else {
1223: $result .= "<option value='$i'>$i a.m</option>\n";
1224: }
1225: }
1226: $result .= "<option " . ($date->hour == 12 ? 'selected ':'') .
1227: " value='12'>noon</option>\n";
1228: for ($i = 13; $i < 24; $i++) {
1229: my $printedHour = $i - 12;
1230: if ($date->hour == $i) {
1231: $result .= "<option selected value='$i'>$printedHour p.m.</option>\n";
1232: } else {
1233: $result .= "<option value='$i'>$printedHour p.m.</option>\n";
1234: }
1235: }
1236:
1237: $result .= "</select> :\n";
1238:
1239: $result .= "<select name='${var}minute'>\n";
1240: for ($i = 0; $i < 60; $i++) {
1241: my $printedMinute = $i;
1242: if ($i < 10) {
1243: $printedMinute = "0" . $printedMinute;
1244: }
1245: if ($date->min == $i) {
1246: $result .= "<option selected>";
1247: } else {
1248: $result .= "<option>";
1249: }
1250: $result .= "$printedMinute</option>\n";
1251: }
1252: $result .= "</select>\n";
1253: }
1254:
1255: return $result;
1256:
1257: }
1258: # If a NEXTSTATE was given, switch to it
1259: sub postprocess {
1260: my $self = shift;
1261: my $var = $self->{'variable'};
1262: my $month = $ENV{'form.' . $var . 'month'};
1263: my $day = $ENV{'form.' . $var . 'day'};
1264: my $year = $ENV{'form.' . $var . 'year'};
1265: my $min = 0;
1266: my $hour = 0;
1267: if ($self->{'hoursminutes'}) {
1268: $min = $ENV{'form.' . $var . 'minute'};
1269: $hour = $ENV{'form.' . $var . 'hour'};
1270: }
1271:
1272: my $chosenDate = Time::Local::timelocal(0, $min, $hour, $day, $month, $year);
1273: # Check to make sure that the date was not automatically co-erced into a
1274: # valid date, as we want to flag that as an error
1275: # This happens for "Feb. 31", for instance, which is coerced to March 2 or
1276: # 3, depending on if it's a leapyear
1277: my $checkDate = localtime($chosenDate);
1278:
1279: if ($checkDate->mon != $month || $checkDate->mday != $day ||
1280: $checkDate->year + 1900 != $year) {
1281: $self->{ERROR_MSG} = "Can't use " . $months[$month] . " $day, $year as a "
1282: . "date because it doesn't exist. Please enter a valid date.";
1.6 bowersj2 1283: return 0;
1.5 bowersj2 1284: }
1285:
1286: $helper->{VARS}->{$var} = $chosenDate;
1287:
1288: if (defined($self->{NEXTSTATE})) {
1289: $helper->changeState($self->{NEXTSTATE});
1290: }
1.6 bowersj2 1291:
1292: return 1;
1.5 bowersj2 1293: }
1294: 1;
1295:
1296: package Apache::lonhelper::resource;
1297:
1298: =pod
1299:
1300: =head2 Element: resource
1301:
1302: <resource> elements allow the user to select one or multiple resources
1303: from the current course. You can filter out which resources they can view,
1304: and filter out which resources they can select. The course will always
1305: be displayed fully expanded, because of the difficulty of maintaining
1306: selections across folder openings and closings. If this is fixed, then
1307: the user can manipulate the folders.
1308:
1309: <resource> takes the standard variable attribute to control what helper
1310: variable stores the results. It also takes a "multichoice" attribute,
1.17 bowersj2 1311: which controls whether the user can select more then one resource. The
1312: "toponly" attribute controls whether the resource display shows just the
1313: resources in that sequence, or recurses into all sub-sequences, defaulting
1314: to false.
1.5 bowersj2 1315:
1316: B<SUB-TAGS>
1317:
1318: =over 4
1319:
1320: =item * <filterfunc>: If you want to filter what resources are displayed
1321: to the user, use a filter func. The <filterfunc> tag should contain
1322: Perl code that when wrapped with "sub { my $res = shift; " and "}" is
1323: a function that returns true if the resource should be displayed,
1324: and false if it should be skipped. $res is a resource object.
1325: (See Apache::lonnavmaps documentation for information about the
1326: resource object.)
1327:
1328: =item * <choicefunc>: Same as <filterfunc>, except that controls whether
1329: the given resource can be chosen. (It is almost always a good idea to
1330: show the user the folders, for instance, but you do not always want to
1331: let the user select them.)
1332:
1333: =item * <nextstate>: Standard nextstate behavior.
1334:
1335: =item * <valuefunc>: This function controls what is returned by the resource
1336: when the user selects it. Like filterfunc and choicefunc, it should be
1337: a function fragment that when wrapped by "sub { my $res = shift; " and
1338: "}" returns a string representing what you want to have as the value. By
1339: default, the value will be the resource ID of the object ($res->{ID}).
1340:
1.13 bowersj2 1341: =item * <mapurl>: If the URL of a map is given here, only that map
1342: will be displayed, instead of the whole course.
1343:
1.5 bowersj2 1344: =back
1345:
1346: =cut
1347:
1348: no strict;
1349: @ISA = ("Apache::lonhelper::element");
1350: use strict;
1351:
1352: BEGIN {
1.7 bowersj2 1353: &Apache::lonhelper::register('Apache::lonhelper::resource',
1.5 bowersj2 1354: ('resource', 'filterfunc',
1.13 bowersj2 1355: 'choicefunc', 'valuefunc',
1356: 'mapurl'));
1.5 bowersj2 1357: }
1358:
1359: sub new {
1360: my $ref = Apache::lonhelper::element->new();
1361: bless($ref);
1362: }
1363:
1364: # CONSTRUCTION: Construct the message element from the XML
1365: sub start_resource {
1366: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1367:
1368: if ($target ne 'helper') {
1369: return '';
1370: }
1371:
1372: $paramHash->{'variable'} = $token->[2]{'variable'};
1373: $helper->declareVar($paramHash->{'variable'});
1.14 bowersj2 1374: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1.17 bowersj2 1375: $paramHash->{'toponly'} = $token->[2]{'toponly'};
1.5 bowersj2 1376: return '';
1377: }
1378:
1379: sub end_resource {
1380: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1381:
1382: if ($target ne 'helper') {
1383: return '';
1384: }
1385: if (!defined($paramHash->{FILTER_FUNC})) {
1386: $paramHash->{FILTER_FUNC} = sub {return 1;};
1387: }
1388: if (!defined($paramHash->{CHOICE_FUNC})) {
1389: $paramHash->{CHOICE_FUNC} = sub {return 1;};
1390: }
1391: if (!defined($paramHash->{VALUE_FUNC})) {
1392: $paramHash->{VALUE_FUNC} = sub {my $res = shift; return $res->{ID}; };
1393: }
1394: Apache::lonhelper::resource->new();
1.4 bowersj2 1395: return '';
1396: }
1397:
1.5 bowersj2 1398: sub start_filterfunc {
1399: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1400:
1401: if ($target ne 'helper') {
1402: return '';
1403: }
1404:
1405: my $contents = Apache::lonxml::get_all_text('/filterfunc',
1406: $parser);
1407: $contents = 'sub { my $res = shift; ' . $contents . '}';
1408: $paramHash->{FILTER_FUNC} = eval $contents;
1409: }
1410:
1411: sub end_filterfunc { return ''; }
1412:
1413: sub start_choicefunc {
1414: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1415:
1416: if ($target ne 'helper') {
1417: return '';
1418: }
1419:
1420: my $contents = Apache::lonxml::get_all_text('/choicefunc',
1421: $parser);
1422: $contents = 'sub { my $res = shift; ' . $contents . '}';
1423: $paramHash->{CHOICE_FUNC} = eval $contents;
1424: }
1425:
1426: sub end_choicefunc { return ''; }
1427:
1428: sub start_valuefunc {
1429: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1430:
1431: if ($target ne 'helper') {
1432: return '';
1433: }
1434:
1435: my $contents = Apache::lonxml::get_all_text('/valuefunc',
1436: $parser);
1437: $contents = 'sub { my $res = shift; ' . $contents . '}';
1438: $paramHash->{VALUE_FUNC} = eval $contents;
1439: }
1440:
1441: sub end_valuefunc { return ''; }
1442:
1.13 bowersj2 1443: sub start_mapurl {
1444: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1445:
1446: if ($target ne 'helper') {
1447: return '';
1448: }
1449:
1450: my $contents = Apache::lonxml::get_all_text('/mapurl',
1451: $parser);
1.14 bowersj2 1452: $paramHash->{MAP_URL} = $contents;
1.13 bowersj2 1453: }
1454:
1455: sub end_mapurl { return ''; }
1456:
1.5 bowersj2 1457: # A note, in case I don't get to this before I leave.
1458: # If someone complains about the "Back" button returning them
1459: # to the previous folder state, instead of returning them to
1460: # the previous helper state, the *correct* answer is for the helper
1461: # to keep track of how many times the user has manipulated the folders,
1462: # and feed that to the history.go() call in the helper rendering routines.
1463: # If done correctly, the helper itself can keep track of how many times
1464: # it renders the same states, so it doesn't go in just this state, and
1465: # you can lean on the browser back button to make sure it all chains
1466: # correctly.
1467: # Right now, though, I'm just forcing all folders open.
1468:
1469: sub render {
1470: my $self = shift;
1471: my $result = "";
1472: my $var = $self->{'variable'};
1473: my $curVal = $helper->{VARS}->{$var};
1474:
1.15 bowersj2 1475: my $buttons = '';
1476:
1477: if ($self->{'multichoice'}) {
1478: $result = <<SCRIPT;
1479: <script>
1.18 ! bowersj2 1480: function checkall(value, checkName) {
1.15 bowersj2 1481: for (i=0; i<document.forms.helpform.elements.length; i++) {
1482: ele = document.forms.helpform.elements[i];
1.18 ! bowersj2 1483: if (ele.name == checkName + '.forminput') {
1.15 bowersj2 1484: document.forms.helpform.elements[i].checked=value;
1485: }
1486: }
1487: }
1488: </script>
1489: SCRIPT
1490: $buttons = <<BUTTONS;
1491: <br />
1.18 ! bowersj2 1492: <input type="button" onclick="checkall(true, '$var')" value="Select All Resources" />
! 1493: <input type="button" onclick="checkall(false, '$var')" value="Unselect All Resources" />
1.15 bowersj2 1494: <br />
1495: BUTTONS
1496: }
1497:
1.5 bowersj2 1498: if (defined $self->{ERROR_MSG}) {
1.14 bowersj2 1499: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1.5 bowersj2 1500: }
1501:
1.15 bowersj2 1502: $result .= $buttons;
1503:
1.5 bowersj2 1504: my $filterFunc = $self->{FILTER_FUNC};
1505: my $choiceFunc = $self->{CHOICE_FUNC};
1506: my $valueFunc = $self->{VALUE_FUNC};
1.13 bowersj2 1507: my $mapUrl = $self->{MAP_URL};
1.14 bowersj2 1508: my $multichoice = $self->{'multichoice'};
1.5 bowersj2 1509:
1510: # Create the composite function that renders the column on the nav map
1511: # have to admit any language that lets me do this can't be all bad
1512: # - Jeremy (Pythonista) ;-)
1513: my $checked = 0;
1514: my $renderColFunc = sub {
1515: my ($resource, $part, $params) = @_;
1.14 bowersj2 1516:
1517: my $inputType;
1518: if ($multichoice) { $inputType = 'checkbox'; }
1519: else {$inputType = 'radio'; }
1520:
1.5 bowersj2 1521: if (!&$choiceFunc($resource)) {
1522: return '<td> </td>';
1523: } else {
1.14 bowersj2 1524: my $col = "<td><input type='$inputType' name='${var}.forminput' ";
1525: if (!$checked && !$multichoice) {
1.5 bowersj2 1526: $col .= "checked ";
1527: $checked = 1;
1528: }
1529: $col .= "value='" .
1530: HTML::Entities::encode(&$valueFunc($resource))
1531: . "' /></td>";
1532: return $col;
1533: }
1534: };
1535:
1.17 bowersj2 1536: $ENV{'form.condition'} = !$self->{'toponly'};
1.5 bowersj2 1537: $result .=
1538: &Apache::lonnavmaps::render( { 'cols' => [$renderColFunc,
1539: Apache::lonnavmaps::resource()],
1540: 'showParts' => 0,
1541: 'filterFunc' => $filterFunc,
1.13 bowersj2 1542: 'resource_no_folder_link' => 1,
1543: 'iterator_map' => $mapUrl }
1.5 bowersj2 1544: );
1.15 bowersj2 1545:
1546: $result .= $buttons;
1.5 bowersj2 1547:
1548: return $result;
1549: }
1550:
1551: sub postprocess {
1552: my $self = shift;
1.14 bowersj2 1553:
1554: if ($self->{'multichoice'}) {
1555: $self->process_multiple_choices($self->{'variable'}.'.forminput',
1556: $self->{'variable'});
1557: }
1558:
1559: if ($self->{'multichoice'} && !$helper->{VARS}->{$self->{'variable'}}) {
1560: $self->{ERROR_MSG} = 'You must choose at least one resource to continue.';
1561: return 0;
1562: }
1563:
1.5 bowersj2 1564: if (defined($self->{NEXTSTATE})) {
1565: $helper->changeState($self->{NEXTSTATE});
1566: }
1.6 bowersj2 1567:
1568: return 1;
1.5 bowersj2 1569: }
1570:
1571: 1;
1572:
1573: package Apache::lonhelper::student;
1574:
1575: =pod
1576:
1577: =head2 Element: student
1578:
1579: Student elements display a choice of students enrolled in the current
1580: course. Currently it is primitive; this is expected to evolve later.
1581:
1582: Student elements take two attributes: "variable", which means what
1583: it usually does, and "multichoice", which if true allows the user
1584: to select multiple students.
1585:
1586: =cut
1587:
1588: no strict;
1589: @ISA = ("Apache::lonhelper::element");
1590: use strict;
1591:
1592:
1593:
1594: BEGIN {
1.7 bowersj2 1595: &Apache::lonhelper::register('Apache::lonhelper::student',
1.5 bowersj2 1596: ('student'));
1597: }
1598:
1599: sub new {
1600: my $ref = Apache::lonhelper::element->new();
1601: bless($ref);
1602: }
1.4 bowersj2 1603:
1.5 bowersj2 1604: sub start_student {
1.4 bowersj2 1605: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1606:
1607: if ($target ne 'helper') {
1608: return '';
1609: }
1610:
1.5 bowersj2 1611: $paramHash->{'variable'} = $token->[2]{'variable'};
1612: $helper->declareVar($paramHash->{'variable'});
1613: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1.12 bowersj2 1614: if (defined($token->[2]{'nextstate'})) {
1615: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
1616: }
1617:
1.5 bowersj2 1618: }
1619:
1620: sub end_student {
1621: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1622:
1623: if ($target ne 'helper') {
1624: return '';
1625: }
1626: Apache::lonhelper::student->new();
1.3 bowersj2 1627: }
1.5 bowersj2 1628:
1629: sub render {
1630: my $self = shift;
1631: my $result = '';
1632: my $buttons = '';
1.18 ! bowersj2 1633: my $var = $self->{'variable'};
1.5 bowersj2 1634:
1635: if ($self->{'multichoice'}) {
1636: $result = <<SCRIPT;
1637: <script>
1.18 ! bowersj2 1638: function checkall(value, checkName) {
1.15 bowersj2 1639: for (i=0; i<document.forms.helpform.elements.length; i++) {
1.18 ! bowersj2 1640: ele = document.forms.helpform.elements[i];
! 1641: if (ele.name == checkName + '.forminput') {
! 1642: document.forms.helpform.elements[i].checked=value;
! 1643: }
1.5 bowersj2 1644: }
1645: }
1646: </script>
1647: SCRIPT
1648: $buttons = <<BUTTONS;
1649: <br />
1.18 ! bowersj2 1650: <input type="button" onclick="checkall(true, '$var')" value="Select All Students" />
! 1651: <input type="button" onclick="checkall(false, '$var')" value="Unselect All Students" />
1.5 bowersj2 1652: <br />
1653: BUTTONS
1654: }
1655:
1656: if (defined $self->{ERROR_MSG}) {
1657: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1658: }
1659:
1660: # Load up the students
1661: my $choices = &Apache::loncoursedata::get_classlist();
1662: my @keys = keys %{$choices};
1663:
1664: # Constants
1665: my $section = Apache::loncoursedata::CL_SECTION();
1666: my $fullname = Apache::loncoursedata::CL_FULLNAME();
1667:
1668: # Sort by: Section, name
1669: @keys = sort {
1670: if ($choices->{$a}->[$section] ne $choices->{$b}->[$section]) {
1671: return $choices->{$a}->[$section] cmp $choices->{$b}->[$section];
1672: }
1673: return $choices->{$a}->[$fullname] cmp $choices->{$b}->[$fullname];
1674: } @keys;
1675:
1676: my $type = 'radio';
1677: if ($self->{'multichoice'}) { $type = 'checkbox'; }
1678: $result .= "<table cellspacing='2' cellpadding='2' border='0'>\n";
1679: $result .= "<tr><td></td><td align='center'><b>Student Name</b></td>".
1680: "<td align='center'><b>Section</b></td></tr>";
1681:
1682: my $checked = 0;
1683: foreach (@keys) {
1684: $result .= "<tr><td><input type='$type' name='" .
1685: $self->{'variable'} . '.forminput' . "'";
1686:
1687: if (!$self->{'multichoice'} && !$checked) {
1688: $result .= " checked ";
1689: $checked = 1;
1690: }
1691: $result .=
1692: " value='" . HTML::Entities::encode($_)
1693: . "' /></td><td>"
1694: . HTML::Entities::encode($choices->{$_}->[$fullname])
1695: . "</td><td align='center'>"
1696: . HTML::Entities::encode($choices->{$_}->[$section])
1697: . "</td></tr>\n";
1698: }
1699:
1700: $result .= "</table>\n\n";
1701: $result .= $buttons;
1.4 bowersj2 1702:
1.5 bowersj2 1703: return $result;
1704: }
1705:
1.6 bowersj2 1706: sub postprocess {
1707: my $self = shift;
1708:
1709: my $result = $ENV{'form.' . $self->{'variable'} . '.forminput'};
1710: if (!$result) {
1711: $self->{ERROR_MSG} = 'You must choose at least one student '.
1712: 'to continue.';
1713: return 0;
1714: }
1715:
1716: if ($self->{'multichoice'}) {
1717: $self->process_multiple_choices($self->{'variable'}.'.forminput',
1718: $self->{'variable'});
1719: }
1720: if (defined($self->{NEXTSTATE})) {
1721: $helper->changeState($self->{NEXTSTATE});
1722: }
1723:
1724: return 1;
1725: }
1726:
1.5 bowersj2 1727: 1;
1728:
1729: package Apache::lonhelper::files;
1730:
1731: =pod
1732:
1733: =head2 Element: files
1734:
1735: files allows the users to choose files from a given directory on the
1736: server. It is always multichoice and stores the result as a triple-pipe
1737: delimited entry in the helper variables.
1738:
1739: Since it is extremely unlikely that you can actually code a constant
1740: representing the directory you wish to allow the user to search, <files>
1741: takes a subroutine that returns the name of the directory you wish to
1742: have the user browse.
1743:
1744: files accepts the attribute "variable" to control where the files chosen
1745: are put. It accepts the attribute "multichoice" as the other attribute,
1746: defaulting to false, which if true will allow the user to select more
1747: then one choice.
1748:
1749: <files> accepts three subtags. One is the "nextstate" sub-tag that works
1750: as it does with the other tags. Another is a <filechoice> sub tag that
1751: is Perl code that, when surrounded by "sub {" and "}" will return a
1752: string representing what directory on the server to allow the user to
1753: choose files from. Finally, the <filefilter> subtag should contain Perl
1754: code that when surrounded by "sub { my $filename = shift; " and "}",
1755: returns a true value if the user can pick that file, or false otherwise.
1756: The filename passed to the function will be just the name of the file,
1757: with no path info.
1758:
1759: =cut
1760:
1761: no strict;
1762: @ISA = ("Apache::lonhelper::element");
1763: use strict;
1764:
1765: BEGIN {
1.7 bowersj2 1766: &Apache::lonhelper::register('Apache::lonhelper::files',
1767: ('files', 'filechoice', 'filefilter'));
1.5 bowersj2 1768: }
1769:
1770: sub new {
1771: my $ref = Apache::lonhelper::element->new();
1772: bless($ref);
1773: }
1774:
1775: sub start_files {
1776: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1777:
1778: if ($target ne 'helper') {
1779: return '';
1780: }
1781: $paramHash->{'variable'} = $token->[2]{'variable'};
1782: $helper->declareVar($paramHash->{'variable'});
1783: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1784: }
1785:
1786: sub end_files {
1787: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1788:
1789: if ($target ne 'helper') {
1790: return '';
1791: }
1792: if (!defined($paramHash->{FILTER_FUNC})) {
1793: $paramHash->{FILTER_FUNC} = sub { return 1; };
1794: }
1795: Apache::lonhelper::files->new();
1796: }
1797:
1798: sub start_filechoice {
1799: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1800:
1801: if ($target ne 'helper') {
1802: return '';
1803: }
1804: $paramHash->{'filechoice'} = Apache::lonxml::get_all_text('/filechoice',
1805: $parser);
1806: }
1807:
1808: sub end_filechoice { return ''; }
1809:
1810: sub start_filefilter {
1811: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1812:
1813: if ($target ne 'helper') {
1814: return '';
1815: }
1816:
1817: my $contents = Apache::lonxml::get_all_text('/filefilter',
1818: $parser);
1819: $contents = 'sub { my $filename = shift; ' . $contents . '}';
1820: $paramHash->{FILTER_FUNC} = eval $contents;
1821: }
1822:
1823: sub end_filefilter { return ''; }
1.3 bowersj2 1824:
1825: sub render {
1826: my $self = shift;
1.5 bowersj2 1827: my $result = '';
1828: my $var = $self->{'variable'};
1829:
1830: my $subdirFunc = eval('sub {' . $self->{'filechoice'} . '}');
1.11 bowersj2 1831: die 'Error in resource filter code for variable ' .
1832: {'variable'} . ', Perl said:' . $@ if $@;
1833:
1.5 bowersj2 1834: my $subdir = &$subdirFunc();
1835:
1836: my $filterFunc = $self->{FILTER_FUNC};
1837: my $buttons = '';
1838:
1839: if ($self->{'multichoice'}) {
1840: $result = <<SCRIPT;
1841: <script>
1.18 ! bowersj2 1842: function checkall(value, checkName) {
1.15 bowersj2 1843: for (i=0; i<document.forms.helpform.elements.length; i++) {
1844: ele = document.forms.helpform.elements[i];
1.18 ! bowersj2 1845: if (ele.name == checkName + '.forminput') {
1.15 bowersj2 1846: document.forms.helpform.elements[i].checked=value;
1.5 bowersj2 1847: }
1848: }
1849: }
1850: </script>
1851: SCRIPT
1.15 bowersj2 1852: $buttons = <<BUTTONS;
1.5 bowersj2 1853: <br />
1.18 ! bowersj2 1854: <input type="button" onclick="checkall(true, '$var')" value="Select All Files" />
! 1855: <input type="button" onclick="checkall(false, '$var')" value="Unselect All Files" />
1.5 bowersj2 1856: <br />
1857: BUTTONS
1858: }
1859:
1860: # Get the list of files in this directory.
1861: my @fileList;
1862:
1863: # If the subdirectory is in local CSTR space
1864: if ($subdir =~ m|/home/([^/]+)/public_html|) {
1865: my $user = $1;
1866: my $domain = $Apache::lonnet::perlvar{'lonDefDomain'};
1867: @fileList = &Apache::lonnet::dirlist($subdir, $domain, $user, '');
1868: } else {
1869: # local library server resource space
1870: @fileList = &Apache::lonnet::dirlist($subdir, $ENV{'user.domain'}, $ENV{'user.name'}, '');
1871: }
1.3 bowersj2 1872:
1.5 bowersj2 1873: $result .= $buttons;
1874:
1.6 bowersj2 1875: if (defined $self->{ERROR_MSG}) {
1876: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1877: }
1878:
1.5 bowersj2 1879: $result .= '<table border="0" cellpadding="1" cellspacing="1">';
1880:
1881: # Keeps track if there are no choices, prints appropriate error
1882: # if there are none.
1883: my $choices = 0;
1884: my $type = 'radio';
1885: if ($self->{'multichoice'}) {
1886: $type = 'checkbox';
1887: }
1888: # Print each legitimate file choice.
1889: for my $file (@fileList) {
1890: $file = (split(/&/, $file))[0];
1891: if ($file eq '.' || $file eq '..') {
1892: next;
1893: }
1894: my $fileName = $subdir .'/'. $file;
1895: if (&$filterFunc($file)) {
1896: $result .= '<tr><td align="right">' .
1897: "<input type='$type' name='" . $var
1898: . ".forminput' value='" . HTML::Entities::encode($fileName) .
1899: "'";
1900: if (!$self->{'multichoice'} && $choices == 0) {
1901: $result .= ' checked';
1902: }
1903: $result .= "/></td><td>" . $file . "</td></tr>\n";
1904: $choices++;
1905: }
1906: }
1907:
1908: $result .= "</table>\n";
1909:
1910: if (!$choices) {
1911: $result .= '<font color="#FF0000">There are no files available to select in this directory. Please go back and select another option.</font><br /><br />';
1912: }
1913:
1914: $result .= $buttons;
1915:
1916: return $result;
1.4 bowersj2 1917: }
1.5 bowersj2 1918:
1.4 bowersj2 1919: sub postprocess {
1920: my $self = shift;
1.6 bowersj2 1921: my $result = $ENV{'form.' . $self->{'variable'} . '.forminput'};
1922: if (!$result) {
1923: $self->{ERROR_MSG} = 'You must choose at least one file '.
1924: 'to continue.';
1925: return 0;
1926: }
1927:
1.5 bowersj2 1928: if ($self->{'multichoice'}) {
1929: $self->process_multiple_choices($self->{'variable'}.'.forminput',
1930: $self->{'variable'});
1931: }
1932: if (defined($self->{NEXTSTATE})) {
1933: $helper->changeState($self->{NEXTSTATE});
1.3 bowersj2 1934: }
1.6 bowersj2 1935:
1936: return 1;
1.3 bowersj2 1937: }
1.8 bowersj2 1938:
1939: 1;
1940:
1.11 bowersj2 1941: package Apache::lonhelper::section;
1942:
1943: =pod
1944:
1945: =head2 Element: section
1946:
1947: <section> allows the user to choose one or more sections from the current
1948: course.
1949:
1950: It takes the standard attributes "variable", "multichoice", and
1951: "nextstate", meaning what they do for most other elements.
1952:
1953: =cut
1954:
1955: no strict;
1956: @ISA = ("Apache::lonhelper::choices");
1957: use strict;
1958:
1959: BEGIN {
1960: &Apache::lonhelper::register('Apache::lonhelper::section',
1961: ('section'));
1962: }
1963:
1964: sub new {
1965: my $ref = Apache::lonhelper::choices->new();
1966: bless($ref);
1967: }
1968:
1969: sub start_section {
1970: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1971:
1972: if ($target ne 'helper') {
1973: return '';
1974: }
1.12 bowersj2 1975:
1976: $paramHash->{CHOICES} = [];
1977:
1.11 bowersj2 1978: $paramHash->{'variable'} = $token->[2]{'variable'};
1979: $helper->declareVar($paramHash->{'variable'});
1980: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1981: if (defined($token->[2]{'nextstate'})) {
1.12 bowersj2 1982: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
1.11 bowersj2 1983: }
1984:
1985: # Populate the CHOICES element
1986: my %choices;
1987:
1988: my $section = Apache::loncoursedata::CL_SECTION();
1989: my $classlist = Apache::loncoursedata::get_classlist();
1990: foreach (keys %$classlist) {
1991: my $sectionName = $classlist->{$_}->[$section];
1992: if (!$sectionName) {
1993: $choices{"No section assigned"} = "";
1994: } else {
1995: $choices{$sectionName} = $sectionName;
1996: }
1.12 bowersj2 1997: }
1998:
1.11 bowersj2 1999: for my $sectionName (sort(keys(%choices))) {
1.12 bowersj2 2000:
1.11 bowersj2 2001: push @{$paramHash->{CHOICES}}, [$sectionName, $sectionName];
2002: }
2003: }
2004:
1.12 bowersj2 2005: sub end_section {
2006: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1.11 bowersj2 2007:
1.12 bowersj2 2008: if ($target ne 'helper') {
2009: return '';
2010: }
2011: Apache::lonhelper::section->new();
2012: }
1.11 bowersj2 2013: 1;
2014:
1.8 bowersj2 2015: package Apache::lonhelper::general;
2016:
2017: =pod
2018:
2019: =head2 General-purpose tag: <exec>
2020:
2021: The contents of the exec tag are executed as Perl code, not inside a
2022: safe space, so the full range of $ENV and such is available. The code
2023: will be executed as a subroutine wrapped with the following code:
2024:
2025: "sub { my $helper = shift; my $state = shift;" and
2026:
2027: "}"
2028:
2029: The return value is ignored.
2030:
2031: $helper is the helper object. Feel free to add methods to the helper
2032: object to support whatever manipulation you may need to do (for instance,
2033: overriding the form location if the state is the final state; see
2034: lonparm.helper for an example).
2035:
2036: $state is the $paramHash that has currently been generated and may
2037: be manipulated by the code in exec. Note that the $state is not yet
2038: an actual state B<object>, it is just a hash, so do not expect to
2039: be able to call methods on it.
2040:
2041: =cut
2042:
2043: BEGIN {
2044: &Apache::lonhelper::register('Apache::lonhelper::general',
1.11 bowersj2 2045: 'exec', 'condition', 'clause',
2046: 'eval');
1.8 bowersj2 2047: }
2048:
2049: sub start_exec {
2050: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2051:
2052: if ($target ne 'helper') {
2053: return '';
2054: }
2055:
2056: my $code = &Apache::lonxml::get_all_text('/exec', $parser);
2057:
2058: $code = eval ('sub { my $helper = shift; my $state = shift; ' .
2059: $code . "}");
1.11 bowersj2 2060: die 'Error in <exec>, Perl said: '. $@ if $@;
1.8 bowersj2 2061: &$code($helper, $paramHash);
2062: }
2063:
2064: sub end_exec { return ''; }
2065:
2066: =pod
2067:
2068: =head2 General-purpose tag: <condition>
2069:
2070: The <condition> tag allows you to mask out parts of the helper code
2071: depending on some programatically determined condition. The condition
2072: tag contains a tag <clause> which contains perl code that when wrapped
2073: with "sub { my $helper = shift; my $state = shift; " and "}", returns
2074: a true value if the XML in the condition should be evaluated as a normal
2075: part of the helper, or false if it should be completely discarded.
2076:
2077: The <clause> tag must be the first sub-tag of the <condition> tag or
2078: it will not work as expected.
2079:
2080: =cut
2081:
2082: # The condition tag just functions as a marker, it doesn't have
2083: # to "do" anything. Technically it doesn't even have to be registered
2084: # with the lonxml code, but I leave this here to be explicit about it.
2085: sub start_condition { return ''; }
2086: sub end_condition { return ''; }
2087:
2088: sub start_clause {
2089: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2090:
2091: if ($target ne 'helper') {
2092: return '';
2093: }
2094:
2095: my $clause = Apache::lonxml::get_all_text('/clause', $parser);
2096: $clause = eval('sub { my $helper = shift; my $state = shift; '
2097: . $clause . '}');
1.11 bowersj2 2098: die 'Error in clause of condition, Perl said: ' . $@ if $@;
1.8 bowersj2 2099: if (!&$clause($helper, $paramHash)) {
2100: # Discard all text until the /condition.
2101: &Apache::lonxml::get_all_text('/condition', $parser);
2102: }
2103: }
2104:
2105: sub end_clause { return ''; }
1.11 bowersj2 2106:
2107: =pod
2108:
2109: =head2 General-purpose tag: <eval>
2110:
2111: The <eval> tag will be evaluated as a subroutine call passed in the
2112: current helper object and state hash as described in <condition> above,
2113: but is expected to return a string to be printed directly to the
2114: screen. This is useful for dynamically generating messages.
2115:
2116: =cut
2117:
2118: # This is basically a type of message.
2119: # Programmatically setting $paramHash->{NEXTSTATE} would work, though
2120: # it's probably bad form.
2121:
2122: sub start_eval {
2123: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2124:
2125: if ($target ne 'helper') {
2126: return '';
2127: }
2128:
2129: my $program = Apache::lonxml::get_all_text('/eval', $parser);
2130: $program = eval('sub { my $helper = shift; my $state = shift; '
2131: . $program . '}');
2132: die 'Error in eval code, Perl said: ' . $@ if $@;
2133: $paramHash->{MESSAGE_TEXT} = &$program($helper, $paramHash);
2134: }
2135:
2136: sub end_eval {
2137: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2138:
2139: if ($target ne 'helper') {
2140: return '';
2141: }
2142:
2143: Apache::lonhelper::message->new();
2144: }
2145:
1.13 bowersj2 2146: 1;
2147:
2148: package Apache::lonhelper::parmwizfinal;
2149:
2150: # This is the final state for the parmwizard. It is not generally useful,
2151: # so it is not perldoc'ed. It does its own processing.
2152: # It is represented with <parmwizfinal />, and
2153: # should later be moved to lonparmset.pm .
2154:
2155: no strict;
2156: @ISA = ('Apache::lonhelper::element');
2157: use strict;
1.11 bowersj2 2158:
1.13 bowersj2 2159: BEGIN {
2160: &Apache::lonhelper::register('Apache::lonhelper::parmwizfinal',
2161: ('parmwizfinal'));
2162: }
2163:
2164: use Time::localtime;
2165:
2166: sub new {
2167: my $ref = Apache::lonhelper::choices->new();
2168: bless ($ref);
2169: }
2170:
2171: sub start_parmwizfinal { return ''; }
2172:
2173: sub end_parmwizfinal {
2174: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2175:
2176: if ($target ne 'helper') {
2177: return '';
2178: }
2179: Apache::lonhelper::parmwizfinal->new();
2180: }
2181:
2182: # Renders a form that, when submitted, will form the input to lonparmset.pm
2183: sub render {
2184: my $self = shift;
2185: my $vars = $helper->{VARS};
2186:
2187: # FIXME: Unify my designators with the standard ones
2188: my %dateTypeHash = ('open_date' => "Opening Date",
2189: 'due_date' => "Due Date",
2190: 'answer_date' => "Answer Date");
2191: my %parmTypeHash = ('open_date' => "0_opendate",
2192: 'due_date' => "0_duedate",
2193: 'answer_date' => "0_answerdate");
2194:
1.14 bowersj2 2195: my $result = "<form name='helpform' method='get' action='/adm/parmset'>\n";
1.13 bowersj2 2196: $result .= '<p>Confirm that this information is correct, then click "Finish Wizard" to complete setting the parameter.<ul>';
2197: my $affectedResourceId = "";
2198: my $parm_name = $parmTypeHash{$vars->{ACTION_TYPE}};
2199: my $level = "";
2200:
2201: # Print the type of manipulation:
2202: $result .= '<li>Setting the <b>' . $dateTypeHash{$vars->{ACTION_TYPE}}
2203: . "</b></li>\n";
2204: if ($vars->{ACTION_TYPE} eq 'due_date' ||
2205: $vars->{ACTION_TYPE} eq 'answer_date') {
2206: # for due dates, we default to "date end" type entries
2207: $result .= "<input type='hidden' name='recent_date_end' " .
2208: "value='" . $vars->{PARM_DATE} . "' />\n";
2209: $result .= "<input type='hidden' name='pres_value' " .
2210: "value='" . $vars->{PARM_DATE} . "' />\n";
2211: $result .= "<input type='hidden' name='pres_type' " .
2212: "value='date_end' />\n";
2213: } elsif ($vars->{ACTION_TYPE} eq 'open_date') {
2214: $result .= "<input type='hidden' name='recent_date_start' ".
2215: "value='" . $vars->{PARM_DATE} . "' />\n";
2216: $result .= "<input type='hidden' name='pres_value' " .
2217: "value='" . $vars->{PARM_DATE} . "' />\n";
2218: $result .= "<input type='hidden' name='pres_type' " .
2219: "value='date_start' />\n";
2220: }
2221:
2222: # Print the granularity, depending on the action
2223: if ($vars->{GRANULARITY} eq 'whole_course') {
2224: $result .= '<li>for <b>all resources in the course</b></li>';
2225: $level = 9; # general course, see lonparmset.pm perldoc
2226: $affectedResourceId = "0.0";
2227: } elsif ($vars->{GRANULARITY} eq 'map') {
2228: my $navmap = Apache::lonnavmaps::navmap->new(
2229: $ENV{"request.course.fn"}.".db",
2230: $ENV{"request.course.fn"}."_parms.db", 0, 0);
2231: my $res = $navmap->getById($vars->{RESOURCE_ID});
2232: my $title = $res->compTitle();
2233: $navmap->untieHashes();
2234: $result .= "<li>for the map named <b>$title</b></li>";
2235: $level = 8;
2236: $affectedResourceId = $vars->{RESOURCE_ID};
2237: } else {
2238: my $navmap = Apache::lonnavmaps::navmap->new(
2239: $ENV{"request.course.fn"}.".db",
2240: $ENV{"request.course.fn"}."_parms.db", 0, 0);
2241: my $res = $navmap->getById($vars->{RESOURCE_ID});
2242: my $title = $res->compTitle();
2243: $navmap->untieHashes();
2244: $result .= "<li>for the resource named <b>$title</b></li>";
2245: $level = 7;
2246: $affectedResourceId = $vars->{RESOURCE_ID};
2247: }
2248:
2249: # Print targets
2250: if ($vars->{TARGETS} eq 'course') {
2251: $result .= '<li>for <b>all students in course</b></li>';
2252: } elsif ($vars->{TARGETS} eq 'section') {
2253: my $section = $vars->{SECTION_NAME};
2254: $result .= "<li>for section <b>$section</b></li>";
2255: $level -= 3;
2256: $result .= "<input type='hidden' name='csec' value='" .
2257: HTML::Entities::encode($section) . "' />\n";
2258: } else {
2259: # FIXME: This is probably wasteful! Store the name!
2260: my $classlist = Apache::loncoursedata::get_classlist();
2261: my $name = $classlist->{$vars->{USER_NAME}}->[6];
2262: $result .= "<li>for <b>$name</b></li>";
2263: $level -= 6;
2264: my ($uname, $udom) = split /:/, $vars->{USER_NAME};
2265: $result .= "<input type='hidden' name='uname' value='".
2266: HTML::Entities::encode($uname) . "' />\n";
2267: $result .= "<input type='hidden' name='udom' value='".
2268: HTML::Entities::encode($udom) . "' />\n";
2269: }
2270:
2271: # Print value
2272: $result .= "<li>to <b>" . ctime($vars->{PARM_DATE}) . "</b> (" .
2273: Apache::lonnavmaps::timeToHumanString($vars->{PARM_DATE})
2274: . ")</li>\n";
2275:
2276: # print pres_marker
2277: $result .= "\n<input type='hidden' name='pres_marker'" .
2278: " value='$affectedResourceId&$parm_name&$level' />\n";
2279:
2280: $result .= "<br /><br /><center><input type='submit' value='Finish Helper' /></center></form>\n";
2281:
2282: return $result;
2283: }
2284:
2285: sub overrideForm {
2286: return 1;
2287: }
1.5 bowersj2 2288:
1.4 bowersj2 2289: 1;
1.3 bowersj2 2290:
1.1 bowersj2 2291: __END__
1.3 bowersj2 2292:
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