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[LON-CAPA] /
rat /
lonpageflip.pm
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Mon May 30 02:52:42 2016 UTC (7 years, 11 months ago) by
raeburn
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MAIN
CVS tags:
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- Bug 6808. New course container -- "Placement" for Placement Tests.
- Placement Tets includes 'firstanswerable' as a direction to
take student to first unanaswered proble in an incomplete test.
1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
5: # $Id: lonpageflip.pm,v 1.91 2016/05/30 02:52:42 raeburn Exp $
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29:
30:
31:
32: package Apache::lonpageflip;
33:
34: use strict;
35: use LONCAPA;
36: use Apache::Constants qw(:common :http REDIRECT);
37: use Apache::lonnet;
38: use Apache::loncommon();
39: use Apache::lonnavmaps();
40: use Apache::lonuserstate;
41: use Apache::lonlocal;
42: use HTML::TokeParser;
43: use GDBM_File;
44:
45: # ========================================================== Module Global Hash
46:
47: my %hash;
48:
49: sub cleanup {
50: if (tied(%hash)){
51: &Apache::lonnet::logthis('Cleanup pageflip: hash');
52: unless (untie(%hash)) {
53: &Apache::lonnet::logthis('Failed cleanup pageflip: hash');
54: }
55: }
56: return OK;
57: }
58:
59: sub addrid {
60: my ($current,$new,$condid)=@_;
61: unless ($condid) { $condid=0; }
62:
63: if ($current) {
64: $current.=','.$new;
65: } else {
66: $current=''.$new;
67: }
68:
69: return $current;
70: }
71:
72: sub fullmove {
73: my ($rid,$mapurl,$direction)=@_;
74: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
75: &GDBM_READER(),0640)) {
76: ($rid,$mapurl)=&move($rid,$mapurl,$direction);
77: untie(%hash);
78: }
79: return($rid,$mapurl);
80: }
81:
82: sub hash_src {
83: my ($id)=@_;
84: my ($mapid,$resid)=split(/\./,$id);
85: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
86: $resid,$hash{'src_'.$id});
87: my $anchor;
88: if ($hash{'ext_'.$id} eq 'true:') {
89: if ($hash{'src_'.$id} =~ /(\#.+)$/) {
90: $anchor = $1;
91: }
92: }
93: if ($hash{'encrypted_'.$id}) {
94: return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
95: &Apache::lonenc::encrypted($symb),
96: $hash{'encrypted_'.$id},$anchor);
97: }
98: return ($hash{'src_'.$id},$symb,$hash{'encrypted_'.$id},$anchor);
99: }
100:
101: sub move {
102: my ($next,$endupmap,$direction) = @_;
103: my $safecount=0;
104: my $allowed=0;
105: do {
106: ($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
107:
108: my $url = $hash{'src_'.$next};
109: my ($mapid,$resid)=split(/\./,$next);
110: my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
111: $resid,$url);
112: if ($url eq '' || $symb eq '') {
113: $allowed = 0;
114: } else {
115: my $priv = &Apache::lonnet::allowed('bre',$url,$symb);
116: $allowed = (($priv eq 'F') || ($priv eq '2'));
117: }
118: $safecount++;
119: } while ( ($next)
120: && ($next!~/\,/)
121: && (
122: (!$hash{'src_'.$next})
123: || (
124: (!$env{'request.role.adv'})
125: && $hash{'randomout_'.$next}
126: )
127: || (!$allowed)
128: )
129: && ($safecount<10000));
130:
131: return ($next,$endupmap);
132: }
133:
134: sub get_next_possible_move {
135: my ($rid,$mapurl,$direction)=@_;
136: my $startoutrid=$rid;
137:
138: my $next='';
139:
140: my $mincond=1;
141: my $posnext='';
142: if ($direction eq 'forward') {
143: # --------------------------------------------------------------------- Forward
144: while ($hash{'type_'.$rid} eq 'finish') {
145: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
146: }
147: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
148: my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
149: my $rescond = &Apache::lonnet::docondval($condition);
150: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
151: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
152: if ($thiscond>=$mincond) {
153: if ($posnext) {
154: $posnext.=','.$id.':'.$thiscond;
155: } else {
156: $posnext=$id.':'.$thiscond;
157: }
158: if ($thiscond>$mincond) { $mincond=$thiscond; }
159: }
160: }
161: foreach my $id (split(/\,/,$posnext)) {
162: my ($linkid,$condval)=split(/\:/,$id);
163: if ($condval>=$mincond) {
164: $next=&addrid($next,$hash{'goesto_'.$linkid},
165: $hash{'condid_'.$hash{'undercond_'.$linkid}});
166: }
167: }
168: if ($hash{'is_map_'.$next}) {
169: # This jumps to the beginning of a new map (going down level)
170: if (
171: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
172: $mapurl=$hash{'src_'.$next};
173: $next=$hash{'map_start_'.$hash{'src_'.$next}};
174: } elsif (
175: # This jumps back up from an empty sequence, to a page up one level
176: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
177: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
178: }
179: } elsif
180: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
181: # This comes up from a map (coming up one level);
182: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
183: }
184: } elsif ($direction eq 'back') {
185: # ------------------------------------------------------------------- Backwards
186: while ($hash{'type_'.$rid} eq 'start') {
187: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
188: }
189: foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
190: my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
191: my $rescond = &Apache::lonnet::docondval($condition);
192: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
193: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
194: if ($thiscond>=$mincond) {
195: if ($posnext) {
196: $posnext.=','.$id.':'.$thiscond;
197: } else {
198: $posnext=$id.':'.$thiscond;
199: }
200: if ($thiscond>$mincond) { $mincond=$thiscond; }
201: }
202: }
203: foreach my $id (split(/\,/,$posnext)) {
204: my ($linkid,$condval)=split(/\:/,$id);
205: if ($condval>=$mincond) {
206: $next=&addrid($next,$hash{'comesfrom_'.$linkid},
207: $hash{'condid_'.$hash{'undercond_'.$linkid}});
208: }
209: }
210: if ($hash{'is_map_'.$next}) {
211: # This jumps to the end of a new map (going down one level)
212: if (
213: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
214: $mapurl=$hash{'src_'.$next};
215: $next=$hash{'map_finish_'.$hash{'src_'.$next}};
216: } elsif (
217: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
218: # This jumps back up from an empty sequence, to a page up one level
219: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
220: }
221: } elsif
222: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
223: # This comes back up from a map (going up one level);
224: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
225: }
226: }
227: return ($next,$mapurl);
228: }
229:
230: sub first_accessible_resource {
231: my $furl;
232: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
233: &GDBM_READER(),0640)) {
234: $furl=$hash{'first_url'};
235: my %args;
236: my ($url,$args) = split(/\?/,$furl);
237: foreach my $pair (split(/\&/,$args)) {
238: my ($name,$value) = split(/=/,$pair);
239: $args{&unescape($name)} = &unescape($value);
240: }
241: if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) {
242: # Wow, we cannot see this ... move forward to the next one that we can see
243: my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
244: # Build the new URL
245: my ($newmapid,$newresid)=split(/\./,$newrid);
246: my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
247: $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
248: if ($hash{'encrypted_'.$newrid}) {
249: $furl=&Apache::lonenc::encrypted($furl);
250: }
251: }
252: untie(%hash);
253: return $furl;
254: } else {
255: return '/adm/navmaps';
256: }
257: }
258:
259: sub first_answerable_ressymb {
260: my $navmap = Apache::lonnavmaps::navmap->new;
261: return unless (ref($navmap));
262: my $iterator = $navmap->getIterator(undef,undef,undef,1);
263: return unless (ref($iterator));
264: my ($curRes,$result);
265: while ($curRes = $iterator->next()) {
266: if (ref($curRes) && $curRes->is_problem()) {
267: foreach my $part (@{$curRes->parts()}) {
268: if ($curRes->tries($part) < $curRes->maxtries($part)) {
269: $result = $curRes->link().'?symb='.$curRes->shown_symb();
270: last;
271: }
272: }
273: }
274: }
275: if ($result) {
276: return $result;
277: } else {
278: return &first_accessible_resource();
279: }
280: }
281:
282: # ================================================================ Main Handler
283:
284: sub handler {
285: my $r=shift;
286:
287: # ------------------------------------------- Set document type for header only
288:
289: if ($r->header_only) {
290: &Apache::loncommon::content_type($r,'text/html');
291: $r->send_http_header;
292: return OK;
293: }
294:
295: my %cachehash=();
296: my $multichoice=0;
297: my %multichoicehash=();
298: my ($redirecturl,$redirectsymb,$enc,$anchor);
299: my $next='';
300: my @possibilities=();
301: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
302: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
303: my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
304: if ($currenturl=~m|^/enc/|) {
305: $currenturl=&Apache::lonenc::unencrypted($currenturl);
306: }
307: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
308: $currenturl=~s/^https?\:\/\///;
309: $currenturl=~s/^[^\/]+//;
310: my ($preupdatepos,$last,$reinitcheck);
311: if ($direction eq 'return') {
312: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
313: &GDBM_READER(),0640)) {
314: $last=$hash{'last_known'};
315: untie(%hash);
316: }
317: } elsif ($direction eq 'firstanswerable') {
318: my $furl = &first_answerable_ressymb();
319: &Apache::loncommon::content_type($r,'text/html');
320: $r->header_out(Location =>
321: &Apache::lonnet::absolute_url().$furl);
322: return REDIRECT;
323: } elsif ($direction eq 'endplacement') {
324: &Apache::loncommon::content_type($r,'text/html');
325: $r->send_http_header;
326: $r->print(&Apache::lonplacementtest::showresult());
327: return OK;
328: }
329: if ($env{'request.course.id'}) {
330: # Check if course needs to be re-initialized
331: my $loncaparev = $r->dir_config('lonVersion');
332: ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
333: if ($reinitcheck eq 'switch') {
334: &Apache::loncommon::content_type($r,'text/html');
335: $r->send_http_header;
336: $r->print(&Apache::loncommon::check_release_result(@reinit));
337: return OK;
338: } elsif ($reinitcheck eq 'update') {
339: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
340: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
341: $preupdatepos = &Apache::lonnet::symbread($currenturl);
342: unless ($direction eq 'return') {
343: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
344: &GDBM_READER(),0640)) {
345: $last=$hash{'last_known'};
346: untie(%hash);
347: }
348: }
349: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
350: if ($ferr) {
351: my $requrl = $r->uri;
352: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
353: $env{'user.reinit'} = 1;
354: return HTTP_NOT_ACCEPTABLE;
355: } else {
356: if ($last) {
357: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
358: unless (&Apache::lonnet::symbverify($last,$fn)) {
359: undef($last);
360: }
361: }
362: }
363: }
364: }
365: if ($direction eq 'firstres') {
366: my $furl=&first_accessible_resource();
367: &Apache::loncommon::content_type($r,'text/html');
368: $r->header_out(Location =>
369: &Apache::lonnet::absolute_url().$furl);
370:
371: return REDIRECT;
372: }
373: if ($direction eq 'return') {
374: # -------------------------------------------------------- Return to last known
375: my $newloc;
376: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
377: &GDBM_READER(),0640))) {
378: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
379: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
380: $newloc=$hash{'src_'.$id};
381: if ($newloc) {
382: if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
383: } else {
384: $newloc='/adm/navmaps';
385: }
386: untie %hash;
387: } else {
388: $newloc='/adm/navmaps';
389: }
390: &Apache::loncommon::content_type($r,'text/html');
391: $r->header_out(Location =>
392: &Apache::lonnet::absolute_url().$newloc);
393:
394: return REDIRECT;
395: }
396: #
397: # Is the current URL on the map? If not, start with last known URL
398: #
399:
400: unless (&Apache::lonnet::is_on_map($currenturl)) {
401: if ($preupdatepos) {
402: undef($preupdatepos);
403: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
404: &GDBM_READER(),0640)) {
405: $last=$hash{'last_known'};
406: untie(%hash);
407: }
408: my $newloc;
409: if ($last) {
410: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
411: } else {
412: &Apache::loncommon::content_type($r,'text/html');
413: $r->header_out(Location =>
414: &Apache::lonnet::absolute_url().
415: '/adm/navmaps');
416: return REDIRECT;
417: }
418: }
419: # ------------------------------------------- Do we have any idea where we are?
420: my $position;
421: if ($preupdatepos) {
422: $position = $preupdatepos;
423: } else {
424: $position=Apache::lonnet::symbread($currenturl);
425: }
426: if ($position) {
427: # ------------------------------------------------------------------------- Yes
428: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
429: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
430: $cachehash{$startoutmap}{'last_known'}=
431: [&Apache::lonnet::declutter($currenturl),$mapnum];
432:
433: # ============================================================ Tie the big hash
434: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
435: &GDBM_READER(),0640)) {
436: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
437: '.'.$mapnum;
438:
439: # ------------------------------------------------- Move forward, backward, etc
440: my $endupmap;
441: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
442: # -------------------------------------- Do we have one and only one empty URL?
443: # We are now at at least one non-empty URL
444: # ----------------------------------------------------- Check out possibilities
445: if ($next) {
446: @possibilities=split(/\,/,$next);
447: if ($#possibilities==0) {
448: # ---------------------------------------------- Only one possibility, redirect
449: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
450: $cachehash{$endupmap}{$redirecturl}=
451: [$redirecturl,(split(/\./,$next))[1]];
452: } else {
453: # ------------------------ There are multiple possibilities for a next resource
454: $multichoice=1;
455: foreach my $id (@possibilities) {
456: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
457: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
458: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
459: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
460: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
461: $multichoicehash{'symb_'.$id} =
462: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
463: $second.'___'.$symbSrc);
464:
465: my ($choicemap,$choiceres)=split(/\./,$id);
466: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
467: my $url=$multichoicehash{'src_'.$id};
468: $cachehash{$map}{$url}=[$url,$choiceres];
469: }
470: }
471: } else {
472: # -------------------------------------------------------------- No place to go
473: $multichoice=-1;
474: }
475: # ----------------- The program must come past this point to untie the big hash
476: untie(%hash);
477: # --------------------------------------------------------- Store position info
478: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
479: foreach my $thismap (keys(%cachehash)) {
480: my $mapnum=$cachehash{$thismap}->{'mapnum'};
481: delete($cachehash{$thismap}->{'mapnum'});
482: &Apache::lonnet::symblist($thismap,
483: %{$cachehash{$thismap}});
484: }
485: # ============================================== Do not return before this line
486: if ($redirecturl) {
487: # ----------------------------------------------------- There is a URL to go to
488: if ($direction eq 'forward') {
489: &Apache::lonnet::linklog($currenturl,$redirecturl);
490: }
491: if ($direction eq 'back') {
492: &Apache::lonnet::linklog($redirecturl,$currenturl);
493: }
494: # ------------------------------------- Check for and display critical messages
495: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300);
496: unless ($redirect) {
497: $url=&Apache::lonnet::absolute_url().$redirecturl;
498: my $addanchor;
499: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
500: $addanchor = 1;
501: $url =~ s/\#.+$//;
502: }
503: $url = &add_get_param($url, { 'symb' => $redirectsymb});
504: if ($addanchor) {
505: $url .= $anchor;
506: }
507: }
508: &Apache::loncommon::content_type($r,'text/html');
509: $r->header_out(Location => $url);
510: return REDIRECT;
511: } else {
512: # --------------------------------------------------------- There was a problem
513: &Apache::loncommon::content_type($r,'text/html');
514: $r->send_http_header;
515: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
516: 'explain' =>
517: 'You have reached the end of the sequence of materials.',
518: 'back' => 'Go Back',
519: 'nav' => 'Course Contents',
520: 'wherenext' =>
521: 'There are several possibilities of where to go next',
522: 'pick' =>
523: 'Please click on the the resource you intend to access',
524: 'titleheader' => 'Title',
525: 'type' => 'Type',
526: 'update' => 'Content updated',
527: 'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
528: 'gonav' => 'Go to the Contents page to select a resource to display.',
529: );
530: if (&Apache::loncommon::course_type() eq 'Community') {
531: $lt{'nav'} = &mt('Community Contents');
532: }
533: if ($#possibilities>0) {
534: my $start_page=
535: &Apache::loncommon::start_page('Multiple Resources');
536: $r->print(<<ENDSTART);
537: $start_page
538: <h3>$lt{'wherenext'}</h3>
539: <p>
540: $lt{'pick'}:
541: <p>
542: <table border="2">
543: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
544: ENDSTART
545: foreach my $id (@possibilities) {
546: $r->print(
547: '<tr><td><a href="'.
548: &add_get_param($multichoicehash{'src_'.$id},
549: {'symb' =>
550: $multichoicehash{'symb_'.$id},
551: }).'">'.
552: $multichoicehash{'title_'.$id}.
553: '</a></td><td>'.$multichoicehash{'type_'.$id}.
554: '</td></tr>');
555: }
556: $r->print('</table>');
557: } else {
558: if ($reinitcheck) {
559: if (&Apache::loncommon::course_type() eq 'Community') {
560: $r->print(
561: &Apache::loncommon::start_page('Community Contents Updated'));
562: } else {
563: $r->print(
564: &Apache::loncommon::start_page('Course Contents Updated'));
565: }
566: $r->print('<h2>'.$lt{'update'}.'</h2>'
567: .'<p>'.$lt{'expupdate'}.'<br />'
568: .$lt{'gonav'}.'</p>');
569: } else {
570: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
571: (!$env{'request.role.adv'})) {
572: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
573: if ($incomplete) {
574: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
575: } else {
576: $r->print(&Apache::lonplacementtest::showresult(1));
577: }
578: } else {
579: $r->print(
580: &Apache::loncommon::start_page('No Resource')
581: .'<h2>'.$lt{'title'}.'</h2>'
582: .'<p>'.$lt{'explain'}.'</p>');
583: }
584: }
585: }
586: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') ||
587: ($env{'request.role.adv'})) {
588: if ((!@possibilities) && ($reinitcheck)) {
589: $r->print(
590: &Apache::lonhtmlcommon::actionbox(
591: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
592: ]));
593: } else {
594: $r->print(
595: &Apache::lonhtmlcommon::actionbox(
596: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
597: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
598: ]));
599: }
600:
601: }
602: $r->print(&Apache::loncommon::end_page());
603:
604: return OK;
605: }
606: } else {
607: # ------------------------------------------------- Problem, could not tie hash
608: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
609: return HTTP_NOT_ACCEPTABLE;
610: }
611: } else {
612: # ---------------------------------------- No, could not determine where we are
613: $r->internal_redirect('/adm/ambiguous');
614: return OK;
615: }
616: } else {
617: # -------------------------- Class was not initialized or page fliped strangely
618: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
619: return HTTP_NOT_ACCEPTABLE;
620: }
621: }
622:
623: 1;
624: __END__
625:
626: =pod
627:
628: =head1 NAME
629:
630: Apache::lonpageflip
631:
632: =head1 SYNOPSIS
633:
634: Deals with forward, backward, and other page flips.
635:
636: This is part of the LearningOnline Network with CAPA project
637: described at http://www.lon-capa.org.
638:
639: =head1 OVERVIEW
640:
641: (empty)
642:
643: =head1 SUBROUTINES
644:
645: =over cleanup()
646:
647: =item addrid()
648:
649: =item fullmove()
650:
651: =item hash_src()
652:
653: =item move()
654:
655: =item get_next_possible_move()
656:
657: =item first_accessible_resource()
658:
659: =item handler()
660:
661: =back
662:
663: =cut
664:
665:
666:
667:
668:
669:
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