1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.35 2008/11/20 15:19:05 jms 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::lonsequence;
33:
34: use strict;
35: use Apache::lonnet;
36: use Apache::Constants qw(:common :http REDIRECT);
37: use GDBM_File;
38: use LONCAPA::map();
39: use Apache::lonpageflip();
40: use Apache::loncommon();
41: use Apache::groupsort();
42: use Apache::lonlocal;
43: use HTML::Entities();
44:
45: my %selhash;
46: my $successtied;
47:
48: # ----------------------------------------- Attempt to read from resource space
49:
50: sub attemptread {
51: my ($fn,$unsorted)=@_;
52: &Apache::lonnet::repcopy($fn);
53: if (-e $fn) {
54: return &LONCAPA::map::attemptread($fn,$unsorted);
55: } else {
56: return ();
57: }
58: }
59:
60: sub mapread {
61: my $fn=shift;
62: &Apache::lonnet::repcopy($fn);
63: if (-e $fn) {
64: return &LONCAPA::map::mapread($fn,'');
65: } else {
66: return ();
67: }
68: }
69:
70: # ---------------------------------------------------------------- View Handler
71:
72: sub viewmap {
73: my ($r,$url)=@_;
74:
75: my $js;
76: if ($env{'form.forceselect'}) {
77: $js = (<<ENDSCRIPT);
78: <script type="text/javascript">
79:
80: function select_group() {
81: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
82: }
83:
84: function queue(val) {
85: if (eval("document.forms."+val+".filelink.checked")) {
86: var l=val.length;
87: var v=val.substring(4,l);
88: document.forms.fileattr.acts.value+='1a'+v+'b';
89: }
90: else {
91: var l=val.length;
92: var v=val.substring(4,l);
93: document.forms.fileattr.acts.value+='0a'+v+'b';
94: }
95: }
96:
97: </script>
98: ENDSCRIPT
99: }
100:
101: $r->print(&Apache::loncommon::start_page('Map Contents',$js).
102: '<h1>'.$url.'</h1>');
103: # ------------------ This is trying to select. Provide buttons and tie %selhash
104: if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
105: <form name=fileattr><input type=hidden name=acts value=''>
106: <input type="button" name="close" value='CLOSE' onClick="self.close()">
107: <input type="button" name="groupimport" value='GROUP IMPORT'
108: onClick="javascript:select_group()">
109: </form>
110: ENDSELECT
111: my $diropendb =
112: "/home/httpd/perl/tmp/$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
113: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
114: if ($env{'form.launch'} eq '1') {
115: &start_fresh_session();
116: }
117: $successtied=1;
118:
119: # - Evaluate actions from previous page (both cumulatively and chronologically)
120: if ($env{'form.catalogmode'} eq 'import') {
121: &Apache::groupsort::update_actions_hash(\%selhash);
122: }
123: # -
124: }
125: }
126: # ----------------------------- successtied is now '1' if in working selectmode
127: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
128: if ($fatal==1) {
129: $r->print('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />');
130: }
131: my $idx=0;
132: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
133: if (defined($_)) {
134: $idx++;
135: if ($successtied) {
136: $r->print('<form name="form'.$idx.'">');
137: }
138: my ($title,$url)=split(/\:/,$_);
139: $title = &LONCAPA::map::qtescape($title);
140: unless ($title) { $title=(split(/\//,$url))[-1] };
141: my $enc_title = &HTML::Entities::encode($title,'\'"<>&');
142: unless ($title) {
143: $title='<i>'.&mt('Empty').'</i>';
144: $enc_title = &mt('Empty');
145: }
146: $url = &LONCAPA::map::qtescape($url);
147: my $enc_url = &HTML::Entities::encode($url,'\'"<>&');
148: if ($url) {
149: if ($successtied) {
150: my $checked='';
151: if ($selhash{'store_'.$url}) {
152: $checked=" checked";
153: }
154: $selhash{"pre_${idx}_link"}=$url;
155: $selhash{"pre_${idx}_title"}=$title;
156:
157: $url = &HTML::Entities::encode($url, '\'"<>&');
158: $r->print(<<ENDCHECKBOX);
159: <input type='checkbox' name='filelink'
160: value='$enc_url' onClick='javascript:queue("form$idx")'$checked />
161: <input type='hidden' name='title' value='$enc_title' />
162: ENDCHECKBOX
163: }
164: $r->print('<a href="'.$enc_url.'">');
165: }
166: $r->print($enc_title);
167: if ($url) { $r->print('</a>'); }
168: if ($successtied) {
169: $r->print('</form>');
170: } else {
171: $r->print('<br>');
172: }
173: }
174: }
175: $r->print(&Apache::loncommon::end_page());
176: if ($successtied) {
177: untie %selhash;
178: }
179: }
180:
181: # ----------------------------------------------------------- Clean out selhash
182: sub start_fresh_session {
183: foreach (keys %selhash) {
184: if ($_ =~ /^pre_/) {
185: delete $selhash{$_};
186: }
187: if ($_ =~ /^store/) {
188: delete $selhash{$_};
189: }
190: }
191: }
192:
193:
194: # ================================================================ Main Handler
195:
196: sub handler {
197: my $r=shift;
198:
199: if ($r->header_only) {
200: &Apache::loncommon::content_type($r,'text/html');
201: $r->send_http_header;
202: return OK;
203: }
204:
205: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
206: ['forceselect','launch']);
207:
208: my %hash;
209: my %bighash;
210: my $requrl=$r->uri;
211:
212: $successtied=0;
213: # ------------------------------------------------------------ Tie symb db file
214: my $disurl='';
215: my $dismapid='';
216: my $exitdisid = '';
217: my $arrow_dir = '';
218:
219: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
220: my $last;
221: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
222: &GDBM_READER(),0640)) {
223: $last=$hash{'last_direction'};
224: untie(%hash);
225: }
226: my $direction='';
227: my $prevmap='';
228: if ($last) {
229: ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
230: }
231: # ------------------------------------------------------------- Tie big db file
232: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
233: &GDBM_READER(),0640)) {
234: my $disid='';
235: my $randomout ='';
236:
237: if ($direction eq 'back') {
238: $disid=$bighash{'map_finish_'.$requrl};
239: } else {
240: $disid=$bighash{'map_start_'.$requrl};
241: }
242: if ($disid) {
243: $disurl=$bighash{'src_'.$disid};
244: $dismapid=(split(/\./,$disid))[1];
245: if (!$env{'request.role.adv'}) {
246: $randomout = $bighash{'randomout_'.$disid};
247: }
248: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
249: &GDBM_READER(),0640)) {
250: $last=$hash{'last_known'};
251: untie(%hash);
252: }
253:
254:
255: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
256: while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
257: $direction=($direction?$direction:'forward');
258: ($disid,$requrl)=
259: &Apache::lonpageflip::fullmove($disid,
260: &Apache::lonnet::declutter($requrl),$direction);
261: if ($disid) {
262: $disurl=$bighash{'src_'.$disid};
263: $dismapid=(split(/\./,$disid))[1];
264: if (!$env{'request.role.adv'}) {
265: $randomout = $bighash{'randomout_'.$disid};
266: }
267: }
268: }
269: $exitdisid = $disid;
270: $arrow_dir = $direction;
271:
272: # --------------------------------------- Untie hash, make sure to come by here
273: untie(%bighash);
274: }
275: }
276:
277: # now either disurl is set (going to first page), or we need another display
278: if ($disurl) {
279: # -------------------------------------------------- Has first or last resource
280: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
281: 'last_known' => [$disurl,$dismapid]);
282: &Apache::loncommon::content_type($r,'text/html');
283: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
284: return REDIRECT;
285: } else {
286: &Apache::loncommon::content_type($r,'text/html');
287: $r->send_http_header;
288: if ($exitdisid eq '' && $arrow_dir ne '') {
289: my %lt =&Apache::lonlocal::texthash(
290: 'back' => 'beginning',
291: 'forward' => 'end',
292: 'nere' => 'Next resource could not be displayed',
293: 'goba' => 'Go Back',
294: 'nacc' => 'Navigate Course Content',
295: );
296: my $warnmsg = &mt('As all folders and sequences ');
297: if ($arrow_dir eq 'forward') {
298: $warnmsg .= &mt('following the current resource were empty').',';
299: } elsif ($arrow_dir eq 'back') {
300: $warnmsg .= &mt('preceding the current resource were empty').',';
301: }
302: $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.');
303: my $start_page=
304: &Apache::loncommon::start_page('Empty Folder/Sequence');
305: my $end_page=
306: &Apache::loncommon::end_page();
307: $r->print(<<ENDNONE);
308: $start_page
309: <h3>$lt{'nere'}</h3>
310: <p>$warnmsg</p>
311: <ul>
312: <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
313: <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
314: </ul>
315: $end_page
316: ENDNONE
317: } else {
318: &viewmap($r,$requrl);
319: }
320: return OK;
321: }
322: }
323:
324: 1;
325: __END__
326:
327: =head1 NAME
328:
329: Apache::lonsequence
330:
331: =head1 SYNOPSIS
332:
333: Handler for showing sequence objects of
334: educational resources.
335:
336: This is part of the LearningOnline Network with CAPA project
337: described at http://www.lon-capa.org.
338:
339: =head1 SUBROUTINES
340:
341: =over
342:
343: =item handler()
344:
345: =item viewmap()
346:
347: =item attemptread()
348:
349: =item mapread()
350:
351: =item start_fresh_session()
352:
353: =back
354:
355: =cut
356:
357:
358:
359:
360:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonsequence.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / rat