File:  [LON-CAPA] / loncom / interface / lonstatistics.pm
Revision 1.47: download - view: text, annotated - select for diffs
Wed Aug 21 17:18:08 2002 UTC (21 years, 10 months ago) by www
Branches: MAIN
CVS tags: version_0_5_1, HEAD
Starting to implement common header and color scheme for LON-CAPA handlers
(non-content pages).

Instead of <body bgcolor="#...."><h1>... call

   &Apache::loncommon::bodytag(title,[role],[add_body_parms]);

title: what it says in the header
role (OPTIONAL): override role choice
                 ('admin','coordinator','student','author')
add_body_parms: additional parameters to be put into the body tag, for
                example 'onLoad="init();" or stuff

Colors and layout will likely change in the future, including domain
customization, help function calls, (css?)

    1: # The LearningOnline Network with CAPA
    2: # (Publication Handler
    3: #
    4: # $Id: lonstatistics.pm,v 1.47 2002/08/21 17:18:08 www Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: # (Navigate problems for statistical reports
   29: # YEAR=2001
   30: # 5/5,7/9,7/25/1,8/11,9/13,9/26,10/5,10/9,10/22,10/26 Behrouz Minaei
   31: # 11/1,11/4,11/16,12/14,12/16,12/18,12/20,12/31 Behrouz Minaei
   32: # YEAR=2002
   33: # 1/22,2/1,2/6,2/25,3/2,3/6,3/17,3/21,3/22,3/26,4/7,5/6 Behrouz Minaei
   34: # 5/12,5/14,5/15,5/19,5/26,7/16,25/7,29/7  Behrouz Minaei
   35: #
   36: ###
   37: 
   38: package Apache::lonstatistics; 
   39: 
   40: use strict;
   41: use Apache::Constants qw(:common :http);
   42: use Apache::lonnet();
   43: use Apache::lonhomework;
   44: use Apache::loncommon;
   45: use Apache::loncoursedata;
   46: use Apache::lonhtmlcommon;
   47: use Apache::lonproblemanalysis;
   48: use Apache::lonproblemstatistics;
   49: use Apache::lonstudentassessment;
   50: use HTML::TokeParser;
   51: use GDBM_File;
   52: 
   53: 
   54: sub CheckFormElement {
   55:     my ($cache, $ENVName, $cacheName, $default)=@_;
   56: 
   57:     if(defined($ENV{'form.'.$ENVName})) {
   58:         $cache->{$cacheName} = $ENV{'form.'.$ENVName};
   59:     } elsif(!defined($cache->{$cacheName})) {
   60:         $cache->{$cacheName} = $default;
   61:     }
   62: 
   63:     return;
   64: }
   65: 
   66: sub ProcessFormData{
   67:     my ($cache)=@_;
   68: 
   69:     $cache->{'reportKey'} = 'false';
   70: 
   71:     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
   72:                                             ['sort','download',
   73:                                              'reportSelected',
   74:                                              'StudentAssessmentStudent',
   75:                                              'ProblemStatisticsSort']);
   76:     &CheckFormElement($cache, 'Status', 'Status', 'Active');
   77:     &CheckFormElement($cache, 'postdata', 'reportSelected', 'Class list');
   78:     &CheckFormElement($cache, 'reportSelected', 'reportSelected', 
   79:                       'Class list');
   80:     $cache->{'reportSelected'} = 
   81:         &Apache::lonnet::unescape($cache->{'reportSelected'});
   82:     &CheckFormElement($cache, 'DownloadAll', 'DownloadAll', 'false');
   83:     &CheckFormElement($cache, 'sort', 'sort', 'fullname');
   84:     &CheckFormElement($cache, 'download', 'download', 'false');
   85:     &CheckFormElement($cache, 'StatisticsMaps', 
   86:                       'StatisticsMaps', 'All Maps');
   87:     if(defined($ENV{'form.Section'})) {
   88:         my @sectionsSelected = (ref($ENV{'form.Section'}) ?
   89:                                @{$ENV{'form.Section'}} :
   90:                                 ($ENV{'form.Section'}));
   91:         $cache->{'sectionsSelected'} = join(':', @sectionsSelected);
   92:     } elsif(!defined($cache->{'sectionsSelected'})) {
   93:         $cache->{'sectionsSelected'} = $cache->{'sectionList'};
   94:     }
   95: 
   96:     # student assessment
   97:     if(defined($ENV{'form.CreateStudentAssessment'}) ||
   98:        defined($ENV{'form.NextStudent'}) ||
   99:        defined($ENV{'form.PreviousStudent'})) {
  100:         $cache->{'reportSelected'} = 'Student Assessment';
  101:     }
  102:     if(defined($ENV{'form.NextStudent'})) {
  103:         $cache->{'StudentAssessmentMove'} = 'next';
  104:     } elsif(defined($ENV{'form.PreviousStudent'})) {
  105:         $cache->{'StudentAssessmentMove'} = 'previous';
  106:     } else {
  107:         $cache->{'StudentAssessmentMove'} = 'selected';
  108:     }
  109:     &CheckFormElement($cache, 'StudentAssessmentStudent', 
  110:                       'StudentAssessmentStudent', 'All Students');
  111:     $cache->{'StudentAssessmentStudent'} = 
  112:         &Apache::lonnet::unescape($cache->{'StudentAssessmentStudent'});
  113:     &CheckFormElement($cache, 'DefaultColumns', 'DefaultColumns', 'false');
  114: 
  115:     # Problem analysis
  116:     &CheckFormElement($cache, 'Interval', 'Interval', '1');
  117: 
  118:     # ProblemStatistcs
  119:     &CheckFormElement($cache, 'DisplayCSVFormat',
  120:                       'DisplayFormat', 'Display Table Format');
  121:     &CheckFormElement($cache, 'ProblemStatisticsAscend',
  122:                       'ProblemStatisticsAscend', 'Ascending');
  123:     &CheckFormElement($cache, 'ProblemStatisticsSort',
  124:                       'ProblemStatisticsSort', 'Homework Sets Order');
  125:     &CheckFormElement($cache, 'DisplayLegend', 'DisplayLegend', 'Hide Legend');
  126:     &CheckFormElement($cache, 'SortProblems', 'SortProblems', 
  127:                       'Sort Within Sequence');
  128: 
  129:     # Search only form elements
  130:     my @headingColumns=();
  131:     my @sequenceColumns=();
  132:     my $foundColumn = 0;
  133:     if(defined($ENV{'form.ReselectColumns'})) {
  134:         my @reselected = (ref($ENV{'form.ReselectColumns'}) ? 
  135:                           @{$ENV{'form.ReselectColumns'}}
  136:                           : ($ENV{'form.ReselectColumns'}));
  137:         foreach (@reselected) {
  138:             if(/HeadingColumn/) {
  139:                 push(@headingColumns, $_);
  140:                 $foundColumn = 1;
  141:             } elsif(/SequenceColumn/) {
  142:                 push(@sequenceColumns, $_);
  143:                 $foundColumn = 1;
  144:             }
  145:         }
  146:     }
  147: 
  148:     $cache->{'reportKey'} = 'false';
  149:     if($cache->{'reportSelected'} eq 'Analyze') {
  150:         $cache->{'reportKey'} = 'Analyze';
  151:     } elsif($cache->{'reportSelected'} eq 'DoDiffGraph') {
  152:         $cache->{'reportKey'} = 'DoDiffGraph';
  153:     } elsif($cache->{'reportSelected'} eq 'PercentWrongGraph') {
  154:         $cache->{'reportKey'} = 'PercentWrongGraph';
  155:     }
  156: 
  157:     if(defined($ENV{'form.DoDiffGraph'})) {
  158:         $cache->{'reportSelected'} = 'DoDiffGraph';
  159:         $cache->{'reportKey'} = 'DoDiffGraph';
  160:     } elsif(defined($ENV{'form.PercentWrongGraph'})) {
  161:         $cache->{'reportSelected'} = 'PercentWrongGraph';
  162:         $cache->{'reportKey'} = 'PercentWrongGraph';
  163:     }
  164: 
  165:     foreach (keys(%ENV)) {
  166:         if(/form\.Analyze/) {
  167:             $cache->{'reportSelected'} = 'Analyze';
  168:             $cache->{'reportKey'} = 'Analyze';
  169:             my $data;
  170:             (undef, $data)=split(':::', $_);
  171:             $cache->{'AnalyzeInfo'}=$data;
  172:         } elsif(/form\.HeadingColumn/) {
  173:             my $value = $_;
  174:             $value =~ s/form\.//;
  175:             push(@headingColumns, $value);
  176:             $foundColumn=1;
  177:         } elsif(/form\.SequenceColumn/) {
  178:             my $value = $_;
  179:             $value =~ s/form\.//;
  180:             push(@sequenceColumns, $value);
  181:             $foundColumn=1;
  182:         }
  183:     }
  184: 
  185:     if($foundColumn) {
  186:         $cache->{'HeadingsFound'} = join(':', @headingColumns);
  187:         $cache->{'SequencesFound'} = join(':', @sequenceColumns);;
  188:     }
  189:     if(!defined($cache->{'HeadingsFound'}) || 
  190:        $cache->{'DefaultColumns'} ne 'false') {
  191:         $cache->{'HeadingsFound'}='HeadingColumnFull Name';
  192:     }
  193:     if(!defined($cache->{'SequencesFound'}) ||
  194:        $cache->{'DefaultColumns'} ne 'false') {
  195:         $cache->{'SequencesFound'}='All Sequences';
  196:     }
  197:     $cache->{'DefaultColumns'} = 'false';
  198: 
  199:     return;
  200: }
  201: 
  202: =pod
  203: 
  204: =item &SortStudents()
  205: 
  206: Determines which students to display and in which order.  Which are 
  207: displayed are determined by their status(active/expired).  The order
  208: is determined by the sort button pressed (default to username).  The
  209: type of sorting is username, lastname, or section.
  210: 
  211: =over 4
  212: 
  213: Input: $students, $CacheData
  214: 
  215: $students: A array pointer to a list of students (username:domain)
  216: 
  217: $CacheData: A pointer to the hash tied to the cached data
  218: 
  219: Output: \@order
  220: 
  221: @order: An ordered list of students (username:domain)
  222: 
  223: =back
  224: 
  225: =cut
  226: 
  227: sub SortStudents {
  228:     my ($cache)=@_;
  229: 
  230:     my @students = split(':::',$cache->{'NamesOfStudents'});
  231:     my @sorted1Students=();
  232:     foreach (@students) {
  233:         if($cache->{'Status'} eq 'Any' || 
  234:            $cache->{$_.':Status'} eq $cache->{'Status'}) {
  235:             push(@sorted1Students, $_);
  236:         }
  237:     }
  238: 
  239:     my $sortBy = '';
  240:     if(defined($cache->{'sort'})) {
  241:         $sortBy = ':'.$cache->{'sort'};
  242:     }
  243:     my @order = sort { $cache->{$a.$sortBy} cmp $cache->{$b.$sortBy} ||
  244:                        $cache->{$a.':fullname'} cmp $cache->{$b.':fullname'} } 
  245:                 @sorted1Students;
  246: 
  247:     return \@order;
  248: }
  249: 
  250: =pod
  251: 
  252: =item &SpaceColumns()
  253: 
  254: Determines the width of all the columns in the chart.  It is based on
  255: the max of the data for that column and its header.
  256: 
  257: =over 4
  258: 
  259: Input: $students, $studentInformation, $headings, $ChartDB
  260: 
  261: $students: An array pointer to a list of students (username:domain)
  262: 
  263: $studentInformatin: The type of data for the student information.  It is
  264: used as part of the key in $CacheData.
  265: 
  266: $headings: The name of the student information columns.
  267: 
  268: $ChartDB: The name of the cache database which is opened for read/write.
  269: 
  270: Output: None - All data stored in cache.
  271: 
  272: =back
  273: 
  274: =cut
  275: 
  276: sub SpaceColumns {
  277:     my ($students,$studentInformation,$headings,$cache)=@_;
  278: 
  279:     # Initialize Lengths
  280:     for(my $index=0; $index<(scalar @$headings); $index++) {
  281:         my @titleLength=split(//,$headings->[$index]);
  282:         $cache->{$studentInformation->[$index].':columnWidth'}=
  283:             scalar @titleLength;
  284:     }
  285: 
  286:     foreach my $name (@$students) {
  287:         foreach (@$studentInformation) {
  288:             my @dataLength=split(//,$cache->{$name.':'.$_});
  289:             my $length=(scalar @dataLength);
  290:             if($length > $cache->{$_.':columnWidth'}) {
  291:                 $cache->{$_.':columnWidth'}=$length;
  292:             }
  293:         }
  294:     }
  295: 
  296:     return;
  297: }
  298: 
  299: sub PrepareData {
  300:     my ($c, $cacheDB, $studentInformation, $headings,$r)=@_;
  301: 
  302:     # Test for access to the cache data
  303:     my $courseID=$ENV{'request.course.id'};
  304:     my $isRecalculate=0;
  305:     if(defined($ENV{'form.Recalculate'})) {
  306:         $isRecalculate=1;
  307:     }
  308: 
  309:     my $isCached = &Apache::loncoursedata::TestCacheData($cacheDB, 
  310:                                                          $isRecalculate);
  311:     if($isCached < 0) {
  312:         return "Unable to tie hash to db file.";
  313:     }
  314: 
  315:     # Download class list information if not using cached data
  316:     my %cache;
  317:     unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) {
  318:         return "Unable to tie hash to db file.";
  319:     }
  320: 
  321:     if(!$isCached) {
  322:         my $processTopResourceMapReturn=
  323:             &Apache::loncoursedata::ProcessTopResourceMap(\%cache, $c, $r);
  324:         if($processTopResourceMapReturn ne 'OK') {
  325:             untie(%cache);
  326:             return $processTopResourceMapReturn;
  327:         }
  328:     }
  329: 
  330:     if($c->aborted()) {
  331:         untie(%cache);
  332:         return 'aborted'; 
  333:     }
  334: 
  335:     my $classlist=&Apache::loncoursedata::DownloadClasslist($courseID,
  336:                                                 $cache{'ClasslistTimestamp'},
  337:                                                 $c);
  338:     foreach (keys(%$classlist)) {
  339:         if(/^(con_lost|error|no_such_host)/i) {
  340:             untie(%cache);
  341:             return "Error getting student data.";
  342:         }
  343:     }
  344: 
  345:     if($c->aborted()) {
  346:         untie(%cache);
  347:         return 'aborted'; 
  348:     }
  349: 
  350:     # Active is a temporary solution, remember to change
  351:     Apache::loncoursedata::ProcessClasslist(\%cache,$classlist,$courseID,$c);
  352:     if($c->aborted()) {
  353:         untie(%cache);
  354:         return 'aborted'; 
  355:     }
  356: 
  357:     &ProcessFormData(\%cache);
  358:     my $students = &SortStudents(\%cache);
  359:     &SpaceColumns($students, $studentInformation, $headings, \%cache);
  360:     $cache{'updateTime:columnWidth'}=24;
  361: 
  362:     if($cache{'download'} ne 'false') {
  363:         my @who = ($cache{'download'});
  364:         $cache{'download'} = 'false';
  365:         if(&Apache::loncoursedata::DownloadStudentCourseData(\@who, 'false', 
  366:                                                              $cacheDB, 'true', 
  367:                                                              'false', $courseID,
  368:                                                              $r, $c) ne 'OK') {
  369:             untie(%cache);
  370:             return 'Stop at download individual';
  371:         }
  372:     } elsif($cache{'DownloadAll'} ne 'false') {
  373:         $cache{'DownloadAll'} = 'false';
  374:         my @allStudents;
  375:         if($cache{'DownloadAll'} eq 'sorted') {
  376:             @allStudents = @$students;
  377:         } else {
  378:             @allStudents = split(':::', $cache{'NamesOfStudents'});
  379:         }
  380:         if(&Apache::loncoursedata::DownloadStudentCourseData(\@allStudents, 
  381:                                                              'false', 
  382:                                                              $cacheDB, 'true', 
  383:                                                              'true', $courseID,
  384:                                                              $r, $c) ne 'OK') {
  385:             untie(%cache);
  386:             return 'Stop at download all';
  387:         }
  388:     }
  389: 
  390:     if($c->aborted()) {
  391:         untie(%cache);
  392:         return 'aborted'; 
  393:     }
  394: 
  395:     untie(%cache);
  396: 
  397:     return ('OK', $students);
  398: }
  399: 
  400: sub BuildClasslist {
  401:     my ($cacheDB,$students,$studentInformation,$headings,$r)=@_;
  402: 
  403:     my %cache;
  404:     unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
  405:         return '<html><body>Unable to tie database.</body></html>';
  406:     }
  407: 
  408:     my $Str='';
  409:     $Str .= '<table border="0"><tr><td bgcolor="#777777">'."\n";
  410:     $Str .= '<table border="0" cellpadding="3"><tr bgcolor="#e6ffff">'."\n";
  411: 
  412:     my $displayString = '<td align="left"><a href="/adm/statistics?';
  413:     $displayString .= 'sort=LINKDATA">DISPLAYDATA&nbsp</a></td>'."\n";
  414:     $Str .= &Apache::lonhtmlcommon::CreateHeadings(\%cache, 
  415:                                                    $studentInformation,
  416:                                                    $headings, $displayString);
  417:     $Str .= '</tr>'."\n";
  418: 
  419:     my $alternate=0;
  420:     foreach (@$students) {
  421:         my ($username, $domain) = split(':', $_);
  422:         if($alternate) {
  423:             $Str .= '<tr bgcolor="#ffffe6">';
  424:         } else {
  425:             $Str .= '<tr bgcolor="#ffffc6">';
  426:         }
  427:         $alternate = ($alternate + 1) % 2;
  428:         foreach my $data (@$studentInformation) {
  429:             $Str .= '<td>';
  430:             if($data eq 'fullname') {
  431:                 $Str .= '<a href="/adm/statistics?reportSelected=';
  432:                 $Str .= &Apache::lonnet::escape('Student Assessment');
  433:                 $Str .= '&StudentAssessmentStudent=';
  434:                 $Str .= &Apache::lonnet::escape($cache{$_.':'.$data}).'">';
  435:                 $Str .= $cache{$_.':'.$data}.'&nbsp';
  436:                 $Str .= '</a>';
  437:             } elsif($data eq 'updateTime') {
  438:                 $Str .= '<a href="/adm/statistics?reportSelected=';
  439:                 $Str .= &Apache::lonnet::escape('Class list');
  440:                 $Str .= '&download='.$_.'">';
  441:                 $Str .= $cache{$_.':'.$data}.'&nbsp';
  442:                 $Str .= '&nbsp</a>';
  443:             } else {
  444:                 $Str .= $cache{$_.':'.$data}.'&nbsp';
  445:             }
  446: 
  447:             $Str .= '</td>'."\n";
  448:         }
  449:     }
  450: 
  451:     $Str .= '</tr>'."\n";
  452:     $Str .= '</table></td></tr></table>'."\n";
  453:     $r->print($Str);
  454:     $r->rflush();
  455: 
  456:     untie(%cache);
  457: 
  458:     return;
  459: }
  460: 
  461: sub CreateMainMenu {
  462:     my ($status, $reports)=@_;
  463: 
  464:     my $Str = '';
  465: 
  466:     $Str .= '<table border="0"><tbody><tr>'."\n";
  467:     $Str .= '<td></td><td></td>'."\n";
  468:     $Str .= '<td align="center"><b>Analysis Reports:</b></td>'."\n";
  469:     $Str .= '<td align="center"><b>Student Status:</b></td></tr>'."\n";
  470:     $Str .= '<tr>'."\n";
  471:     $Str .= '<td align="center"><input type="submit" name="Refresh" ';
  472:     $Str .= 'value="Refresh" /></td>'."\n";
  473:     $Str .= '<td align="center"><input type="submit" name="DownloadAll" ';
  474:     $Str .= 'value="Update All Student Data" /></td>'."\n";
  475:     $Str .= '<td align="center">';
  476:     $Str .= '<select name="reportSelected" onchange="document.';
  477:     $Str .= 'Statistics.submit()">'."\n";
  478: 
  479:     foreach (sort(keys(%$reports))) {
  480:         next if($_ eq 'reportSelected');
  481:         $Str .= '<option name="'.$_.'"';
  482:         if($reports->{'reportSelected'} eq $reports->{$_}) {
  483:             $Str .= ' selected=""';
  484:         }
  485:         $Str .= '>'.$reports->{$_}.'</option>'."\n";
  486:     }
  487:     $Str .= '</select></td>'."\n";
  488: 
  489:     $Str .= '<td align="center">';
  490:     $Str .= &Apache::lonhtmlcommon::StatusOptions($status, 'Statistics');
  491:     $Str .= '</td>'."\n";
  492: 
  493:     $Str .= '</tr></tbody></table>'."\n";
  494:     $Str .= '<hr>'."\n";
  495: 
  496:     return $Str;
  497: }
  498: 
  499: sub BuildStatistics {
  500:     my ($r)=@_;
  501: 
  502:     my $c = $r->connection;
  503:     my @studentInformation=('fullname','section','id','domain','username',
  504:                             'updateTime');
  505:     my @headings=('Full Name', 'Section', 'PID', 'Domain', 'User Name',
  506:                   'Last Updated');
  507:     my $spacing = '   ';
  508:     my %reports = ('classlist'          => 'Class list',
  509:                    'problem_statistics' => 'Problem Statistics',
  510:                    'student_assessment' => 'Student Assessment',
  511: #                   'activitylog'        => 'Activity Log',
  512:                    'reportSelected'     => 'Class list');
  513: 
  514:     my %cache;
  515:     my $courseID=$ENV{'request.course.id'};
  516:     my $cacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
  517:                   "_$ENV{'user.domain'}_$courseID\_statistics.db";
  518: 
  519:     $r->print(&Apache::lonhtmlcommon::Title('Course Statistics and Charts'));
  520: 
  521:     my ($returnValue, $students) = &PrepareData($c, $cacheDB, 
  522:                                                 \@studentInformation, 
  523:                                                 \@headings,$r);
  524:     if($returnValue ne 'OK') {
  525:         $r->print($returnValue."\n".'</body></html>');
  526:         return OK;
  527:     }
  528:     if(!$c->aborted()) {
  529:         &Apache::loncoursedata::CheckForResidualDownload($cacheDB, 
  530:                                                          'true', 'true',
  531:                                                          $courseID,
  532:                                                          $r, $c);
  533:     }
  534: 
  535:     my $GoToPage;
  536:     if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
  537:         $GoToPage = $cache{'reportSelected'};
  538:         $reports{'reportSelected'} = $cache{'reportSelected'};
  539:         if(defined($cache{'reportKey'}) && 
  540:            !exists($reports{$cache{'reportKey'}}) && 
  541:            $cache{'reportKey'} ne 'false') {
  542:             $reports{$cache{'reportKey'}} = $cache{'reportSelected'};
  543:         }
  544: 
  545:         if(defined($cache{'OptionResponses'})) {
  546:             $reports{'problem_analysis'} = 'Option Response Analysis';
  547:         }
  548: 
  549:         $r->print('<form name="Statistics" ');
  550:         $r->print('method="post" action="/adm/statistics">');
  551:         $r->print(&CreateMainMenu($cache{'Status'}, \%reports));
  552:         $r->rflush();
  553:         untie(%cache);
  554:     } else {
  555:         $r->print('<html><body>Unable to tie database.</body></html>');
  556:         return OK;
  557:     }
  558: 
  559:     if($GoToPage eq 'Activity Log') {
  560:         &Apache::lonproblemstatistics::Activity();
  561:     } elsif($GoToPage eq 'Problem Statistics') {
  562:         &Apache::lonproblemstatistics::BuildProblemStatisticsPage($cacheDB, 
  563:                                                                   $students, 
  564:                                                                   $courseID, 
  565:                                                                   $c,$r);
  566:     } elsif($GoToPage eq 'Option Response Analysis') {
  567:         &Apache::lonproblemanalysis::BuildProblemAnalysisPage($cacheDB, $r);
  568:     } elsif($GoToPage eq 'Student Assessment') {
  569:         &Apache::lonstudentassessment::BuildStudentAssessmentPage($cacheDB,
  570:                                                           $students,
  571:                                                           $courseID,
  572:                                                           'Statistics',
  573:                                                           \@headings,
  574:                                                           $spacing,
  575:                                                           \@studentInformation,
  576:                                                           $r, $c);
  577:     } elsif($GoToPage eq 'Analyze') {
  578:         &Apache::lonproblemanalysis::BuildAnalyzePage($cacheDB, $students, 
  579:                                                       $courseID, $r);
  580:     } elsif($GoToPage eq 'DoDiffGraph' || $GoToPage eq 'PercentWrongGraph') {
  581:         my $courseDescription = $ENV{'course.'.$courseID.'.description'};
  582:         $courseDescription =~ s/\ /"_"/eg;
  583:         &Apache::lonproblemstatistics::BuildGraphicChart($GoToPage, $cacheDB,
  584:                                                          $courseDescription,
  585:                                                          $students, $courseID,
  586:                                                          $r, $c);
  587:     } elsif($GoToPage eq 'Class list') {
  588:         &BuildClasslist($cacheDB, $students, \@studentInformation,
  589:                         \@headings, $r);
  590:     }
  591: 
  592:     $r->print('</form>'."\n");
  593:     $r->print("\n".'</body>'."\n".'</html>');
  594:     $r->rflush();
  595: 
  596:     return OK;
  597: }
  598: 
  599: # ================================================================ Main Handler
  600: 
  601: sub handler {
  602:     my $r=shift;
  603: 
  604: #    $jr = $r;
  605: 
  606:     unless(&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
  607:         $ENV{'user.error.msg'}=
  608:         $r->uri.":vgr:0:0:Cannot view grades for complete course";
  609:         return HTTP_NOT_ACCEPTABLE; 
  610:     }
  611: 
  612:     # Set document type for header only
  613:     if($r->header_only) {
  614:         if ($ENV{'browser.mathml'}) {
  615:             $r->content_type('text/xml');
  616:         } else {
  617:             $r->content_type('text/html');
  618:         }
  619:         &Apache::loncommon::no_cache($r);
  620:         $r->send_http_header;
  621:         return OK;
  622:     }
  623: 
  624:     unless($ENV{'request.course.fn'}) {
  625: 	my $requrl=$r->uri;
  626:         $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
  627:         return HTTP_NOT_ACCEPTABLE; 
  628:     }
  629: 
  630:     $r->content_type('text/html');
  631:     $r->send_http_header;
  632: 
  633:     &BuildStatistics($r);
  634: 
  635:     return OK;
  636: }
  637: 1;
  638: __END__
  639: 

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