Annotation of rat/lonpageflip.pm, revision 1.83

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Page flip handler
                      4: #
1.83    ! raeburn     5: # $Id: lonpageflip.pm,v 1.82 2013/06/18 13:23:37 bisitz Exp $
1.18      www         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: #
1.1       www        29: 
1.76      jms        30: 
                     31: 
1.1       www        32: package Apache::lonpageflip;
                     33: 
                     34: use strict;
1.68      albertel   35: use LONCAPA;
1.4       www        36: use Apache::Constants qw(:common :http REDIRECT);
1.53      albertel   37: use Apache::lonnet;
1.70      albertel   38: use Apache::loncommon();
1.1       www        39: use HTML::TokeParser;
                     40: use GDBM_File;
                     41: 
1.3       www        42: # ========================================================== Module Global Hash
                     43:   
1.1       www        44: my %hash;
1.34      www        45: 
                     46: sub cleanup {
                     47:     if (tied(%hash)){
                     48: 	&Apache::lonnet::logthis('Cleanup pageflip: hash');
                     49:         unless (untie(%hash)) {
                     50: 	    &Apache::lonnet::logthis('Failed cleanup pageflip: hash');
                     51:         }
                     52:     }
1.63      albertel   53:     return OK;
1.34      www        54: }
1.1       www        55: 
1.3       www        56: sub addrid {
1.4       www        57:     my ($current,$new,$condid)=@_;
                     58:     unless ($condid) { $condid=0; }
1.27      www        59: 
1.3       www        60: 	if ($current) {
1.5       www        61: 	    $current.=','.$new;
1.3       www        62:         } else {
1.5       www        63:             $current=''.$new;
1.3       www        64:         }
1.27      www        65: 
1.3       www        66:     return $current;
1.25      www        67: }
                     68: 
                     69: sub fullmove {
                     70:     my ($rid,$mapurl,$direction)=@_;
1.53      albertel   71:     if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel   72:                         &GDBM_READER(),0640)) {
1.25      www        73: 	($rid,$mapurl)=&move($rid,$mapurl,$direction);
                     74:         untie(%hash);
                     75:     }
                     76:     return($rid,$mapurl);
1.1       www        77: }
                     78: 
1.50      albertel   79: sub hash_src {
                     80:     my ($id)=@_;
1.56      albertel   81:     my ($mapid,$resid)=split(/\./,$id);
                     82:     my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                     83: 					  $resid,$hash{'src_'.$id});
1.50      albertel   84:     if ($hash{'encrypted_'.$id}) {
1.56      albertel   85: 	return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
                     86: 		&Apache::lonenc::encrypted($symb));
1.50      albertel   87:     }
1.56      albertel   88:     return ($hash{'src_'.$id},$symb);
1.50      albertel   89: }
                     90: 
1.15      www        91: sub move {
1.72      albertel   92:     my ($next,$endupmap,$direction) = @_;
                     93:     my $safecount=0;
                     94:     my $allowed=0;
                     95:     do {
                     96: 	($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
                     97: 
                     98: 	my $url = $hash{'src_'.$next};
                     99: 	my ($mapid,$resid)=split(/\./,$next);
                    100: 	my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                    101: 						$resid,$url);
                    102: 	if ($url eq '' || $symb eq '') {
                    103: 	    $allowed = 0;
                    104: 	} else {
                    105: 	    my $priv = &Apache::lonnet::allowed('bre',$url,$symb);
                    106: 	    $allowed = (($priv eq 'F') || ($priv eq '2'));
                    107: 	}
                    108: 	$safecount++;
                    109:     } while (   ($next)
                    110: 	     && ($next!~/\,/)
                    111: 	     && (
                    112: 		    (!$hash{'src_'.$next})
                    113: 		 || (
                    114: 		        (!$env{'request.role.adv'})
                    115: 		     &&  $hash{'randomout_'.$next}
                    116: 		    )
                    117: 		 || (!$allowed)
                    118: 		)
                    119: 	     && ($safecount<10000));
                    120: 
                    121:     return ($next,$endupmap);
                    122: }
                    123: 
                    124: sub get_next_possible_move {
1.15      www       125:     my ($rid,$mapurl,$direction)=@_;
1.23      www       126:     my $startoutrid=$rid;
1.15      www       127: 
                    128:     my $next='';
                    129: 
                    130:               my $mincond=1;
                    131:               my $posnext='';
                    132:               if ($direction eq 'forward') {
                    133: # --------------------------------------------------------------------- Forward
1.33      www       134:                   while ($hash{'type_'.$rid} eq 'finish') {
                    135: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15      www       136:                   }
1.61      albertel  137: 		  foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.64      albertel  138: 		     my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
                    139: 		     my $rescond  = &Apache::lonnet::docondval($condition);
                    140: 		     my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
                    141: 		     my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
                    142: 		     if ($thiscond>=$mincond) {
1.15      www       143: 		          if ($posnext) {
1.61      albertel  144: 		             $posnext.=','.$id.':'.$thiscond;
1.15      www       145:                           } else {
1.61      albertel  146:                              $posnext=$id.':'.$thiscond;
1.15      www       147: 		          }
                    148:                           if ($thiscond>$mincond) { $mincond=$thiscond; }
                    149: 	              }
1.61      albertel  150:                   } 
                    151: 		  foreach my $id (split(/\,/,$posnext))  {
                    152:                       my ($linkid,$condval)=split(/\:/,$id);
1.15      www       153:                       if ($condval>=$mincond) {
                    154: 		          $next=&addrid($next,$hash{'goesto_'.$linkid},
                    155:                                 $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    156:                       }
1.61      albertel  157:                   }
1.15      www       158:                   if ($hash{'is_map_'.$next}) {
1.23      www       159: # This jumps to the beginning of a new map (going down level)
1.15      www       160:                       if (
                    161:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    162: 			  $mapurl=$hash{'src_'.$next};
                    163: 			  $next=$hash{'map_start_'.$hash{'src_'.$next}};
1.47      raeburn   164:                      } elsif (
                    165: # This jumps back up from an empty sequence, to a page up one level
                    166:                          $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    167:                          $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       168:                      }
1.23      www       169:                   } elsif 
                    170:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    171: # This comes up from a map (coming up one level);
                    172: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.61      albertel  173: 		  }
1.15      www       174:               } elsif ($direction eq 'back') {
                    175: # ------------------------------------------------------------------- Backwards
1.33      www       176:                  while ($hash{'type_'.$rid} eq 'start') {
                    177: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
                    178: 		 }
1.62      albertel  179: 		 foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
1.64      albertel  180: 		     my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
                    181: 		     my $rescond  = &Apache::lonnet::docondval($condition);
                    182: 		     my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
                    183: 		     my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
1.62      albertel  184: 		     if ($thiscond>=$mincond) {
                    185: 			 if ($posnext) {
                    186: 		             $posnext.=','.$id.':'.$thiscond;
                    187: 			 } else {
                    188:                              $posnext=$id.':'.$thiscond;
                    189: 			 }
                    190: 			 if ($thiscond>$mincond) { $mincond=$thiscond; }
                    191: 		     }
                    192: 		 } 
                    193: 		 foreach my $id (split(/\,/,$posnext)) {
                    194: 		     my ($linkid,$condval)=split(/\:/,$id);
                    195: 		     if ($condval>=$mincond) {
                    196: 			 $next=&addrid($next,$hash{'comesfrom_'.$linkid},
                    197: 				       $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    198: 		     }
                    199: 		 }
1.15      www       200:                   if ($hash{'is_map_'.$next}) {
1.24      www       201: # This jumps to the end of a new map (going down one level)
1.15      www       202:                       if (
                    203:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    204: 			  $mapurl=$hash{'src_'.$next};
                    205: 			  $next=$hash{'map_finish_'.$hash{'src_'.$next}};
1.47      raeburn   206:                       } elsif (
                    207:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    208: # This jumps back up from an empty sequence, to a page up one level
                    209:                           $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
                    210:                       }
1.24      www       211:                   } elsif 
                    212:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    213: # This comes back up from a map (going up one level);
                    214: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       215:                   }
                    216: 	      }
                    217:               return ($next,$mapurl);
                    218: }
                    219: 
1.69      www       220: sub first_accessible_resource {
                    221:     my $furl;
                    222:     if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
                    223: 	    &GDBM_READER(),0640)) {
                    224: 	$furl=$hash{'first_url'};
1.74      albertel  225: 	my %args;
                    226: 	my ($url,$args) = split(/\?/,$furl);
                    227: 	foreach my $pair (split(/\&/,$args)) {
                    228: 	    my ($name,$value) = split(/=/,$pair);
                    229: 	    $args{&unescape($name)} = &unescape($value);
                    230: 	}
                    231:         if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) {
1.69      www       232: # Wow, we cannot see this ... move forward to the next one that we can see
                    233: 	    my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
                    234: # Build the new URL
1.73      albertel  235: 	    my ($newmapid,$newresid)=split(/\./,$newrid);
1.69      www       236: 	    my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
                    237: 	    $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
                    238: 	    if ($hash{'encrypted_'.$newrid}) {
                    239: 		$furl=&Apache::lonenc::encrypted($furl);
                    240: 	    }
                    241: 	}
                    242: 	untie(%hash);
                    243: 	return $furl;
                    244:     } else {
                    245: 	return '/adm/navmaps';
                    246:     }
                    247: }
                    248: 
1.1       www       249: # ================================================================ Main Handler
                    250: 
                    251: sub handler {
1.2       www       252:    my $r=shift;
1.1       www       253: 
                    254: # ------------------------------------------- Set document type for header only
                    255: 
1.2       www       256:   if ($r->header_only) {
1.51      albertel  257:       &Apache::loncommon::content_type($r,'text/html');
                    258:       $r->send_http_header;
                    259:       return OK;
1.2       www       260:   }
                    261: 
1.5       www       262:   my %cachehash=(); 
                    263:   my $multichoice=0;
                    264:   my %multichoicehash=();
1.56      albertel  265:   my ($redirecturl,$redirectsymb);
1.4       www       266:   my $next='';
                    267:   my @possibilities=();
1.37      www       268:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53      albertel  269:   if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
                    270:       $env{'form.postdata'}=~/(\w+)\:(.*)/;
1.2       www       271:       my $direction=$1;
1.40      www       272:       my $currenturl=$2;
1.50      albertel  273:       if ($currenturl=~m|^/enc/|) {
                    274: 	  $currenturl=&Apache::lonenc::unencrypted($currenturl);
                    275:       }
1.46      www       276:       $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
1.54      albertel  277:       if ($direction eq 'firstres') {
1.69      www       278: 	  my $furl=&first_accessible_resource();
1.54      albertel  279: 	  &Apache::loncommon::content_type($r,'text/html');
                    280: 	  $r->header_out(Location => 
1.71      albertel  281: 			 &Apache::lonnet::absolute_url().$furl);
1.54      albertel  282: 	     
                    283: 	  return REDIRECT;
                    284:       }
1.80      droeschl  285:       if ($direction eq 'return') {
1.10      www       286: # -------------------------------------------------------- Return to last known
                    287:          my $last;
1.53      albertel  288:          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28      albertel  289:                     &GDBM_READER(),0640)) {
1.10      www       290: 	     $last=$hash{'last_known'};
                    291:              untie(%hash);
                    292:          }
                    293:          my $newloc;
1.53      albertel  294:          if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36      www       295:                         &GDBM_READER(),0640))) {
1.52      albertel  296:             my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50      albertel  297: 	    $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
                    298: 	    $newloc=$hash{'src_'.$id};
                    299: 	    if ($newloc) {
                    300: 		if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
                    301: 			      
                    302: 	    } else {
1.57      www       303: 		$newloc='/adm/navmaps';
1.50      albertel  304: 	    }
1.36      www       305:             untie %hash;
1.10      www       306:          } else {
1.57      www       307: 	    $newloc='/adm/navmaps';
1.10      www       308:          }  
1.54      albertel  309: 	     &Apache::loncommon::content_type($r,'text/html');
                    310: 	     $r->header_out(Location => 
1.71      albertel  311: 			    &Apache::lonnet::absolute_url().$newloc);
1.54      albertel  312: 	     
                    313: 	     return REDIRECT;
1.10      www       314:       }
1.78      raeburn   315:       $currenturl=~s/^https?\:\/\///;
1.2       www       316:       $currenturl=~s/^[^\/]+//;
1.35      www       317: #
                    318: # Is the current URL on the map? If not, start with last known URL
                    319: #
                    320:       unless (&Apache::lonnet::is_on_map($currenturl)) {
1.7       www       321: 	 my $last;
1.53      albertel  322:          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28      albertel  323:                     &GDBM_READER(),0640)) {
1.7       www       324: 	     $last=$hash{'last_known'};
                    325:              untie(%hash);
                    326:          }
                    327:          if ($last) {
1.52      albertel  328: 	     $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7       www       329: 	 } else {
1.54      albertel  330: 		 &Apache::loncommon::content_type($r,'text/html');
                    331: 		 $r->header_out(Location => 
1.71      albertel  332: 				&Apache::lonnet::absolute_url().
1.70      albertel  333: 				'/adm/noidea.html');
1.54      albertel  334: 		 return REDIRECT;
1.7       www       335:          }
                    336:       }
1.3       www       337: # ------------------------------------------- Do we have any idea where we are?
                    338:       my $position;
                    339:       if ($position=Apache::lonnet::symbread($currenturl)) {
                    340: # ------------------------------------------------------------------------- Yes
1.41      www       341: 	  my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52      albertel  342:           $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23      www       343:           $cachehash{$startoutmap}{'last_known'}=
1.52      albertel  344:                              [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20      albertel  345: 
1.5       www       346: # ============================================================ Tie the big hash
1.53      albertel  347:           if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel  348:                         &GDBM_READER(),0640)) {
1.29      www       349:               my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
                    350:                       '.'.$mapnum;
1.14      www       351: 
1.15      www       352: # ------------------------------------------------- Move forward, backward, etc
1.22      www       353:               my $endupmap;
                    354:               ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15      www       355: # -------------------------------------- Do we have one and only one empty URL?
1.22      www       356: # We are now at at least one non-empty URL
1.4       www       357: # ----------------------------------------------------- Check out possibilities
                    358:               if ($next) {
                    359:                   @possibilities=split(/\,/,$next);
                    360:                   if ($#possibilities==0) {
1.5       www       361: # ---------------------------------------------- Only one possibility, redirect
1.56      albertel  362: 	              ($redirecturl,$redirectsymb)=&hash_src($next);
1.52      albertel  363:                       $cachehash{$endupmap}{$redirecturl}=
                    364: 			  [$redirecturl,(split(/\./,$next))[1]];
1.4       www       365:                   } else {
1.5       www       366: # ------------------------ There are multiple possibilities for a next resource
                    367:                       $multichoice=1;
1.62      albertel  368: 		      foreach my $id (@possibilities) {
                    369: 			  $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
                    370:                           $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
                    371:                           $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
                    372:                           (my $first, my $second) = $id =~ /(\d+).(\d+)/;
                    373:                           my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
                    374:                           $multichoicehash{'symb_'.$id} = 
1.32      bowersj2  375:                               Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
                    376:                                                         $second.'___'.$symbSrc);
                    377:                                                          
1.62      albertel  378:                           my ($choicemap,$choiceres)=split(/\./,$id);
1.52      albertel  379: 			  my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62      albertel  380: 			  my $url=$multichoicehash{'src_'.$id};
1.52      albertel  381:                           $cachehash{$map}{$url}=[$url,$choiceres];
1.62      albertel  382:                       }
1.4       www       383:                   }
1.5       www       384: 	      } else {
                    385: # -------------------------------------------------------------- No place to go
                    386:                   $multichoice=-1;
1.4       www       387:               }
1.5       www       388: # ----------------- The program must come past this point to untie the big hash
1.3       www       389: 	      untie(%hash);
1.5       www       390: # --------------------------------------------------------- Store position info
1.52      albertel  391:               $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.19      www       392:               foreach my $thismap (keys %cachehash) {
1.52      albertel  393: 		  my $mapnum=$cachehash{$thismap}->{'mapnum'};
                    394: 		  delete($cachehash{$thismap}->{'mapnum'});
                    395: 		  &Apache::lonnet::symblist($thismap,
                    396: 					    %{$cachehash{$thismap}});
1.19      www       397: 	      }
1.5       www       398: # ============================================== Do not return before this line
1.4       www       399:               if ($redirecturl) {
1.5       www       400: # ----------------------------------------------------- There is a URL to go to
1.38      www       401: 		  if ($direction eq 'forward') {
                    402:                      &Apache::lonnet::linklog($currenturl,$redirecturl);
                    403: 		  }
                    404: 		  if ($direction eq 'back') {
                    405:                      &Apache::lonnet::linklog($redirecturl,$currenturl);
                    406: 		  }
1.31      www       407: # ------------------------------------------------- Check for critical messages
1.53      albertel  408: 		  if ((time-$env{'user.criticalcheck.time'})>300) {
1.31      www       409:                      my @what=&Apache::lonnet::dump
1.53      albertel  410:                                   ('critical',$env{'user.domain'},
                    411:                                               $env{'user.name'});
1.31      www       412:                      if ($what[0]) {
                    413: 	                if (($what[0] ne 'con_lost') && 
                    414:                             ($what[0]!~/^error\:/)) {
                    415: 	                   $redirecturl='/adm/email?critical=display';
1.56      albertel  416: 			   $redirectsymb='';
1.31      www       417:                         }
                    418:                      }
1.75      raeburn   419:                      &Apache::lonnet::appenv({'user.criticalcheck.time'=>time});
1.31      www       420: 		  }
                    421: 
1.51      albertel  422: 		  &Apache::loncommon::content_type($r,'text/html');
1.71      albertel  423: 		  my $url=&Apache::lonnet::absolute_url().$redirecturl;
1.66      albertel  424: 		  $url = &add_get_param($url, { 'symb' => $redirectsymb});
1.56      albertel  425:                   $r->header_out(Location => $url);
1.4       www       426:                   return REDIRECT;
1.5       www       427: 	      } else {
                    428: # --------------------------------------------------------- There was a problem
1.51      albertel  429:                   &Apache::loncommon::content_type($r,'text/html');
1.8       www       430:                   $r->send_http_header;
1.59      www       431: 		  my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
                    432: 						     'explain' =>
                    433: 						     'You have reached the end of the sequence of materials.',
                    434: 						     'back' => 'Go Back',
1.83    ! raeburn   435: 						     'nav' => 'Course Contents',
1.59      www       436: 						     'wherenext' =>
                    437: 						     'There are several possibilities of where to go next',
                    438: 						     'pick' =>
                    439: 						     'Please click on the the resource you intend to access',
                    440: 						     'titleheader' => 'Title',
                    441: 						     'type' => 'Type');
1.83    ! raeburn   442:                   if (&Apache::loncommon::course_type() eq 'Community') {
        !           443:                       $lt{'nav'} = &mt('Community Contents');
        !           444:                   }
1.8       www       445:                   if ($#possibilities>0) {
1.67      albertel  446: 		      my $start_page=
                    447: 			  &Apache::loncommon::start_page('Multiple Resources');
1.8       www       448:                      $r->print(<<ENDSTART);
1.67      albertel  449: $start_page
1.59      www       450: <h3>$lt{'wherenext'}</h3>
1.8       www       451: <p>
1.59      www       452: $lt{'pick'}:
1.8       www       453: <p>
1.79      bisitz    454: <table border="2">
1.59      www       455: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8       www       456: ENDSTART
1.62      albertel  457:                      foreach my $id (@possibilities) {
1.8       www       458:                         $r->print(
                    459:                               '<tr><td><a href="'.
1.66      albertel  460: 				  &add_get_param($multichoicehash{'src_'.$id},
                    461: 						 {'symb' =>
                    462: 						      $multichoicehash{'symb_'.$id},
                    463: 						  }).'">'.
1.62      albertel  464:                               $multichoicehash{'title_'.$id}.
                    465:                               '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8       www       466: 			      '</td></tr>');
1.26      www       467:                      }
1.59      www       468:                      $r->print('</table>');
1.8       www       469:                   } else {
1.82      bisitz    470:                       $r->print(
                    471:                           &Apache::loncommon::start_page('No Resource')
                    472:                          .'<h2>'.$lt{'title'}.'</h2>'
                    473:                          .'<p>'.$lt{'explain'}.'</p>');
                    474:                   }
                    475:                   $r->print(
                    476:                       &Apache::lonhtmlcommon::actionbox(
                    477:                           ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
                    478:                            '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
                    479:                           ])
                    480:                      .&Apache::loncommon::end_page());
1.59      www       481:                   return OK;
                    482: 	      }
1.5       www       483: 	  } else {
                    484: # ------------------------------------------------- Problem, could not tie hash
1.53      albertel  485:               $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5       www       486:               return HTTP_NOT_ACCEPTABLE; 
1.3       www       487:           }
1.5       www       488:       } else {
                    489: # ---------------------------------------- No, could not determine where we are
1.42      albertel  490: 	  $r->internal_redirect('/adm/ambiguous');
1.81      raeburn   491:           return OK;
1.2       www       492:       }
1.5       www       493:   } else {
1.2       www       494: # -------------------------- Class was not initialized or page fliped strangely
1.53      albertel  495:       $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2       www       496:       return HTTP_NOT_ACCEPTABLE; 
                    497:   } 
1.1       www       498: }
                    499: 
                    500: 1;
                    501: __END__
                    502: 
1.77      jms       503: =pod
                    504: 
                    505: =head1 NAME
                    506: 
                    507: Apache::lonpageflip
                    508: 
                    509: =head1 SYNOPSIS
                    510: 
                    511: Deals with forward, backward, and other page flips.
                    512: 
                    513: This is part of the LearningOnline Network with CAPA project
                    514: described at http://www.lon-capa.org.
                    515: 
                    516: =head1 OVERVIEW
                    517: 
                    518: (empty)
                    519: 
                    520: =head1 SUBROUTINES
                    521: 
                    522: =over cleanup()
                    523: 
                    524: =item addrid()
                    525: 
                    526: =item fullmove()
                    527: 
                    528: =item hash_src()
                    529: 
                    530: =item move()
                    531: 
                    532: =item get_next_possible_move()
                    533: 
                    534: =item first_accessible_resource()
                    535: 
                    536: =item handler()
                    537: 
                    538: =back
                    539: 
                    540: =cut
1.1       www       541: 
                    542: 
                    543: 
                    544: 
                    545: 
                    546: 

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