[LON-CAPA-cvs] cvs: loncom /interface lonstatistics.pm

matthew lon-capa-cvs@mail.lon-capa.org
Tue, 25 Mar 2003 22:20:25 -0000


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--matthew1048630825
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matthew		Tue Mar 25 17:20:25 2003 EDT

  Modified files:              
    /loncom/interface	lonstatistics.pm 
  Log:
  Removed GDBM_File dependencies, &CheckFormElement, &ProcessFormData,
  &SortStudents,  &SpaceColumns, &PrepareData, &BuildClasslist, and
  &BuildStatistics.
  &handler now works at a relatively high level to determine which statistics/*
  routines to call.
  
  
--matthew1048630825
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Content-Disposition: attachment; filename="matthew-20030325172025.txt"

Index: loncom/interface/lonstatistics.pm
diff -u loncom/interface/lonstatistics.pm:1.64 loncom/interface/lonstatistics.pm:1.65
--- loncom/interface/lonstatistics.pm:1.64	Fri Mar  7 13:46:38 2003
+++ loncom/interface/lonstatistics.pm	Tue Mar 25 17:20:25 2003
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonstatistics.pm,v 1.64 2003/03/07 18:46:38 matthew Exp $
+# $Id: lonstatistics.pm,v 1.65 2003/03/25 22:20:25 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -51,7 +51,6 @@
     use Apache::lonproblemstatistics;
     use Apache::lonstudentassessment;
     use Apache::lonpercentage;
-    use GDBM_File;
 
 =over 4
 
@@ -83,8 +82,7 @@
 use Apache::lonproblemstatistics();
 use Apache::lonstudentassessment();
 use Apache::lonpercentage;
-use GDBM_File;
-
+use Time::HiRes;
 
 #######################################################
 #######################################################
@@ -774,377 +772,8 @@
     return $Str;
 }
 
-##############################################
-##############################################
-
-sub CheckFormElement {
-    my ($cache, $ENVName, $cacheName, $default)=@_;
-
-    if(defined($ENV{'form.'.$ENVName})) {
-        $cache->{$cacheName} = $ENV{'form.'.$ENVName};
-    } elsif(!defined($cache->{$cacheName})) {
-        $cache->{$cacheName} = $default;
-    } else {
-        $ENV{'form.'.$ENVName} = $cache->{$cacheName};
-    }
-    return;
-}
-
-sub ProcessFormData{
-    my ($cache)=@_;
-
-    $cache->{'reportKey'} = 'false';
-
-    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
-                                            ['download',
-                                             'reportSelected',
-                                             'StudentAssessmentStudent',
-                                             'ProblemStatisticsSort']);
-    &CheckFormElement($cache, 'DownloadAll', 'DownloadAll', 'false');
-    if ($cache->{'DownloadAll'} ne 'false') {
-        # Clean the hell out of that cache!
-        # We cannot untie the hash at this scope (stupid libgd :( )
-        # So, remove every single key.  What a waste of time....
-        # Of course, if you are doing this you are probably resigned
-        # to waiting a while.
-        &Apache::lonnet::logthis("Cleaning out the cache file");
-        while (my ($key,undef)=each(%$cache)) {
-            next if ($key eq 'DownloadAll');
-            delete($cache->{$key});
-        }
-    }
-    &CheckFormElement($cache, 'Status', 'Status', 'Active');
-    &CheckFormElement($cache, 'postdata', 'reportSelected', 'Class list');
-    &CheckFormElement($cache, 'reportSelected', 'reportSelected', 
-                      'Class list');
-    $cache->{'reportSelected'} = 
-        &Apache::lonnet::unescape($cache->{'reportSelected'});
-    &CheckFormElement($cache, 'sort', 'sort', 'fullname');
-    &CheckFormElement($cache, 'download', 'download', 'false');
-    &CheckFormElement($cache, 'StatisticsMaps', 
-                      'StatisticsMaps', 'All Maps');
-    &CheckFormElement($cache, 'StatisticsProblemSelect',
-		      'StatisticsProblemSelect', 'All Problems');
-    &CheckFormElement($cache, 'StatisticsPartSelect',
-		      'StatisticsPartSelect', 'All Parts');
-    if(defined($ENV{'form.Section'})) {
-        my @sectionsSelected = (ref($ENV{'form.Section'}) ?
-                               @{$ENV{'form.Section'}} :
-                                ($ENV{'form.Section'}));
-        $cache->{'sectionsSelected'} = join(':', @sectionsSelected);
-    } elsif(!defined($cache->{'sectionsSelected'})) {
-        $cache->{'sectionsSelected'} = $cache->{'sectionList'};
-    }
-
-    # student assessment
-    if(defined($ENV{'form.CreateStudentAssessment'}) ||
-       defined($ENV{'form.NextStudent'}) ||
-       defined($ENV{'form.PreviousStudent'})) {
-        $cache->{'reportSelected'} = 'Student Assessment';
-    }
-    if(defined($ENV{'form.NextStudent'})) {
-        $cache->{'StudentAssessmentMove'} = 'next';
-    } elsif(defined($ENV{'form.PreviousStudent'})) {
-        $cache->{'StudentAssessmentMove'} = 'previous';
-    } else {
-        $cache->{'StudentAssessmentMove'} = 'selected';
-    }
-    &CheckFormElement($cache, 'StudentAssessmentStudent', 
-                      'StudentAssessmentStudent', 'All Students');
-    $cache->{'StudentAssessmentStudent'} = 
-        &Apache::lonnet::unescape($cache->{'StudentAssessmentStudent'});
-    &CheckFormElement($cache, 'DefaultColumns', 'DefaultColumns', 'false');
-
-    # Problem analysis
-    &CheckFormElement($cache, 'Interval', 'Interval', '1');
-
-    # ProblemStatistcs
-    &CheckFormElement($cache, 'DisplayCSVFormat',
-                      'DisplayFormat', 'Display Table Format');
-    &CheckFormElement($cache, 'ProblemStatisticsAscend',
-                      'ProblemStatisticsAscend', 'Ascending');
-    &CheckFormElement($cache, 'ProblemStatisticsSort',
-                      'ProblemStatisticsSort', 'Homework Sets Order');
-    &CheckFormElement($cache, 'DisplayLegend', 'DisplayLegend', 
-		      'Hide Legend');
-    &CheckFormElement($cache, 'SortProblems', 'SortProblems', 
-                      'Sort Within Sequence');
-
-    # Search only form elements
-    my @headingColumns=();
-    my @sequenceColumns=();
-    my $foundColumn = 0;
-    if(defined($ENV{'form.ReselectColumns'})) {
-        my @reselected = (ref($ENV{'form.ReselectColumns'}) ? 
-                          @{$ENV{'form.ReselectColumns'}}
-                          : ($ENV{'form.ReselectColumns'}));
-        foreach (@reselected) {
-            if(/HeadingColumn/) {
-                push(@headingColumns, $_);
-                $foundColumn = 1;
-            } elsif(/SequenceColumn/) {
-                push(@sequenceColumns, $_);
-                $foundColumn = 1;
-            }
-        }
-    }
-
-    $cache->{'reportKey'} = 'false';
-    if($cache->{'reportSelected'} eq 'Analyze') {
-        $cache->{'reportKey'} = 'Analyze';
-    } elsif($cache->{'reportSelected'} eq 'DoDiffGraph') {
-        $cache->{'reportKey'} = 'DoDiffGraph';
-    } elsif($cache->{'reportSelected'} eq 'PercentWrongGraph') {
-        $cache->{'reportKey'} = 'PercentWrongGraph';
-    }
-
-    if(defined($ENV{'form.DoDiffGraph'})) {
-        $cache->{'reportSelected'} = 'DoDiffGraph';
-        $cache->{'reportKey'} = 'DoDiffGraph';
-    } elsif(defined($ENV{'form.PercentWrongGraph'})) {
-        $cache->{'reportSelected'} = 'PercentWrongGraph';
-        $cache->{'reportKey'} = 'PercentWrongGraph';
-    }
-
-    foreach (keys(%ENV)) {
-        if(/form\.Analyze/) {
-            $cache->{'reportSelected'} = 'Analyze';
-            $cache->{'reportKey'} = 'Analyze';
-            my $data;
-            (undef, $data)=split(':::', $_);
-            $cache->{'AnalyzeInfo'}=$data;
-        } elsif(/form\.HeadingColumn/) {
-            my $value = $_;
-            $value =~ s/form\.//;
-            push(@headingColumns, $value);
-            $foundColumn=1;
-        } elsif(/form\.SequenceColumn/) {
-            my $value = $_;
-            $value =~ s/form\.//;
-            push(@sequenceColumns, $value);
-            $foundColumn=1;
-        }
-    }
-
-    if($foundColumn) {
-        $cache->{'HeadingsFound'} = join(':', @headingColumns);
-        $cache->{'SequencesFound'} = join(':', @sequenceColumns);;
-    }
-    if(!defined($cache->{'HeadingsFound'}) || 
-       $cache->{'DefaultColumns'} ne 'false') {
-        $cache->{'HeadingsFound'}='HeadingColumnFull Name';
-    }
-    if(!defined($cache->{'SequencesFound'}) ||
-       $cache->{'DefaultColumns'} ne 'false') {
-        $cache->{'SequencesFound'}='All Sequences';
-    }
-    $cache->{'DefaultColumns'} = 'false';
-
-    return;
-}
-
 ##################################################
 ##################################################
-
-=pod
-
-=item &SortStudents()
-
-Determines which students to display and in which order.  Which are 
-displayed are determined by their status(active/expired).  The order
-is determined by the sort button pressed (default to username).  The
-type of sorting is username, lastname, or section.
-
-=over 4
-
-Input: $students, $CacheData
-
-$students: A array pointer to a list of students (username:domain)
-
-$CacheData: A pointer to the hash tied to the cached data
-
-Output: \@order
-
-@order: An ordered list of students (username:domain)
-
-=back
-
-=cut
-
-sub SortStudents {
-    my ($cache)=@_;
-
-    my @students = split(':::',$cache->{'NamesOfStudents'});
-    my @sorted1Students=();
-    foreach (@students) {
-        if($cache->{'Status'} eq 'Any' || 
-           $cache->{$_.':Status'} eq $cache->{'Status'}) {
-            push(@sorted1Students, $_);
-        }
-    }
-
-    my $sortBy = '';
-    if(defined($cache->{'sort'})) {
-        $sortBy = ':'.$cache->{'sort'};
-    } else {
-        $sortBy = ':fullname';
-    }
-    my @order = sort { lc($cache->{$a.$sortBy}) cmp lc($cache->{$b.$sortBy}) ||
-                       lc($cache->{$a.':fullname'}) cmp lc($cache->{$b.':fullname'}) } 
-                @sorted1Students;
-
-    return \@order;
-}
-
-=pod
-
-=item &SpaceColumns()
-
-Determines the width of all the columns in the chart.  It is based on
-the max of the data for that column and its header.
-
-=over 4
-
-Input: $students, $studentInformation, $headings, $ChartDB
-
-$students: An array pointer to a list of students (username:domain)
-
-$studentInformatin: The type of data for the student information.  It is
-used as part of the key in $CacheData.
-
-$headings: The name of the student information columns.
-
-$ChartDB: The name of the cache database which is opened for read/write.
-
-Output: None - All data stored in cache.
-
-=back
-
-=cut
-
-sub SpaceColumns {
-    my ($students,$studentInformation,$headings,$cache)=@_;
-
-    # Initialize Lengths
-    for(my $index=0; $index<(scalar @$headings); $index++) {
-        my @titleLength=split(//,$headings->[$index]);
-        $cache->{$studentInformation->[$index].':columnWidth'}=
-            scalar @titleLength;
-    }
-
-    foreach my $name (@$students) {
-        foreach (@$studentInformation) {
-            my @dataLength=split(//,$cache->{$name.':'.$_});
-            my $length=(scalar @dataLength);
-            if($length > $cache->{$_.':columnWidth'}) {
-                $cache->{$_.':columnWidth'}=$length;
-            }
-        }
-    }
-
-    return;
-}
-
-sub PrepareData {
-    my ($c, $cacheDB, $studentInformation, $headings,$r)=@_;
-
-    # Test for access to the cache data
-    my $courseID=$ENV{'request.course.id'};
-    my $isRecalculate=0;
-    if(defined($ENV{'form.Recalculate'})) {
-        $isRecalculate=1;
-    }
-
-    my $isCached = &Apache::loncoursedata::TestCacheData($cacheDB,
-                                                         $isRecalculate);
-    if($isCached < 0) {
-        return "Unable to tie hash to db file.";
-    }
-
-    # Download class list information if not using cached data
-    my %cache;
-    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) {
-        return "Unable to tie hash to db file.";
-    }
-
-#    if(!$isCached) {
-        my $processTopResourceMapReturn=
-            &Apache::loncoursedata::ProcessTopResourceMap(\%cache, $c);
-        if($processTopResourceMapReturn ne 'OK') {
-            untie(%cache);
-            return $processTopResourceMapReturn;
-        }
- #   }
-
-    if($c->aborted()) {
-        untie(%cache);
-        return 'aborted'; 
-    }
-
-    my $classlist=&Apache::loncoursedata::DownloadClasslist($courseID,
-                                                $cache{'ClasslistTimestamp'},
-                                                $c);
-    foreach (keys(%$classlist)) {
-        if(/^(con_lost|error|no_such_host)/i) {
-            untie(%cache);
-            return "Error getting student data.";
-        }
-    }
-
-    if($c->aborted()) {
-        untie(%cache);
-        return 'aborted'; 
-    }
-
-    # Active is a temporary solution, remember to change
-    Apache::loncoursedata::ProcessClasslist(\%cache,$classlist,$courseID,$c);
-    if($c->aborted()) {
-        untie(%cache);
-        return 'aborted'; 
-    }
-
-    &ProcessFormData(\%cache);
-    my $students = &SortStudents(\%cache);
-    &SpaceColumns($students, $studentInformation, $headings, \%cache);
-    $cache{'updateTime:columnWidth'}=24;
-
-    my $download = $cache{'download'};
-    my $downloadAll = $cache{'DownloadAll'};
-    my @allStudents=();
-    if($download ne 'false') {
-        $cache{'download'} = 'false';
-    } elsif($downloadAll ne 'false') {
-        $cache{'DownloadAll'} = 'false';
-        if($downloadAll eq 'sorted') {
-            @allStudents = @$students;
-        } else {
-            @allStudents = split(':::', $cache{'NamesOfStudents'});
-        }
-    }
-
-    untie(%cache);
-
-    if($download ne 'false') {
-        my @who = ($download);
-        if(&Apache::loncoursedata::DownloadStudentCourseData(\@who, 'false',
-                                                             $cacheDB, 'true',
-                                                             'false', $courseID,
-                                                             $r, $c) ne 'OK') {
-            return 'Stop at download individual';
-        }
-    } elsif($downloadAll ne 'false') {
-        if(&Apache::loncoursedata::DownloadStudentCourseData(\@allStudents,
-                                                             'false',
-                                                             $cacheDB, 'true',
-                                                             'true', $courseID,
-                                                             $r, $c) ne 'OK') {
-            return 'Stop at download all';
-        }
-    }
-
-    return ('OK', $students);
-}
-
 sub DisplayClasslist {
     my ($r)=@_;
     #
@@ -1154,13 +783,13 @@
     $Str .= '<table border="0"><tr><td bgcolor="#777777">'."\n";
     $Str .= '<table border="0" cellpadding="3"><tr bgcolor="#e6ffff">'."\n";
     foreach my $field (@Fields) {
-        $Str .= '<th><a href="/adm/statistics?sort='.$field.'">'.$field.
+        $Str .= '<th><a href="/adm/statistics?reportSelected=classlist&sort='.$field.'">'.$field.
             '</a></th>';
     }
     $Str .= '</tr>'."\n";
     #
     my $alternate = 0;
-    foreach my $student (@Students) {
+    foreach my $student (@Students) { # @Students is a package variable
         my $sname = $student->{'username'}.':'.$student->{'domain'};
         if($alternate) {
             $Str .= '<tr bgcolor="#ffffe6">';
@@ -1173,7 +802,7 @@
             $Str .= '<td>';
             if ($field eq 'fullname') {
                 $Str .= '<a href="/adm/statistics?reportSelected=';
-                $Str .= &Apache::lonnet::escape('Student Assessment');
+                $Str .= &Apache::lonnet::escape('student_assessment');
                 $Str .= '&StudentAssessmentStudent=';
                 $Str .= &Apache::lonnet::escape($sname).'">';
                 $Str .= $student->{$field}.'&nbsp';
@@ -1193,240 +822,64 @@
     return;
 }
 
-sub BuildClasslist {
-    my ($cacheDB,$students,$studentInformation,$headings,$r)=@_;
-
-    my %cache;
-    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
-        return '<html><body>Unable to tie database.</body></html>';
-    }
-
-#    my $Ptr = '';
-#    $Ptr .= '<table border="0"><tbody>';
-#    $Ptr .= '<tr><td align="right"><b>Select Sections</b>';
-#    $Ptr .= '</td>'."\n";
-#    $Ptr .= '<td align="left">'."\n";
-#    my @sectionsSelected = split(':',$cache{'sectionsSelected'});
-#    my @sections = split(':',$cache{'sectionList'});
-#    $Ptr .= &Apache::lonhtmlcommon::MultipleSectionSelect(\@sections,
-#                                                          \@sectionsSelected,
-#                                                          'Statistics');
-#    $Ptr .= '</td></tr></table><br>';
-#    $r->print($Ptr);
-#    $r->rflush();
-#    my %mySections = ();
-#    foreach (@sections) { $mySections{$_} = 'True'; }
-#    $r->print("<br>$cache{'sectionsSelected'}<br>");
-
-    my $Str='';
-    $Str .= '<table border="0"><tr><td bgcolor="#777777">'."\n";
-    $Str .= '<table border="0" cellpadding="3"><tr bgcolor="#e6ffff">'."\n";
-
-    my $displayString = '<td align="left"><a href="/adm/statistics?';
-    $displayString .= 'sort=LINKDATA">DISPLAYDATA&nbsp</a></td>'."\n";
-    $Str .= &Apache::lonhtmlcommon::CreateHeadings(\%cache,
-                                                   $studentInformation,
-                                                   $headings, $displayString);
-    $Str .= '</tr>'."\n";
-
-    my $alternate=0;
-    foreach (@$students) {
-#        if ($mySections{$cache{$_.':'.'section'}} ne 'True') {next;}
-        my ($username, $domain) = split(':', $_);
-        if($alternate) {
-            $Str .= '<tr bgcolor="#ffffe6">';
-        } else {
-            $Str .= '<tr bgcolor="#ffffc6">';
-        }
-        $alternate = ($alternate + 1) % 2;
-        foreach my $data (@$studentInformation) {
-            $Str .= '<td>';
-            if($data eq 'fullname') {
-                $Str .= '<a href="/adm/statistics?reportSelected=';
-                $Str .= &Apache::lonnet::escape('Student Assessment');
-                $Str .= '&StudentAssessmentStudent=';
-                $Str .= &Apache::lonnet::escape($cache{$_.':'.$data}).'">';
-                $Str .= $cache{$_.':'.$data}.'&nbsp';
-                $Str .= '</a>';
-            } elsif($data eq 'updateTime') {
-                $Str .= '<a href="/adm/statistics?reportSelected=';
-                $Str .= &Apache::lonnet::escape('Class list');
-                $Str .= '&download='.$_.'">';
-                $Str .= $cache{$_.':'.$data}.'&nbsp';
-                $Str .= '&nbsp</a>';
-            } else {
-                $Str .= $cache{$_.':'.$data}.'&nbsp';
-            }
-
-            $Str .= '</td>'."\n";
-        }
-    }
-
-    $Str .= '</tr>'."\n";
-    $Str .= '</table></td></tr></table>'."\n";
-    $r->print($Str);
-    $r->rflush();
-
-    untie(%cache);
-
-    return;
-}
-
+##############################################
+##############################################
 sub CreateMainMenu {
-    my ($status, $reports)=@_;
-
+    my ($status,$reports,$current)=@_;
+    #
     my $Str = '';
-
+    #
     $Str .= '<table border="0"><tbody><tr>'."\n";
     $Str .= '<td></td>'."\n";
     $Str .= '<td align="center"><b>Select a Report</b></td>'."\n";
     $Str .= '<td align="center"><b>Student Status</b></td></tr>'."\n";
     $Str .= '<tr>'."\n";
+    #
     $Str .= '<td align="center"><input type="submit" name="Refresh" ';
     $Str .= 'value="Update Display" /></td>'."\n";
+    #
     $Str .= '<td align="center">';
-    $Str .= '<select name="reportSelected" onchange="document.';
-    $Str .= 'Statistics.submit()">'."\n";
-
+    $Str .= '<select name="reportSelected" >'."\n";
     foreach (sort(keys(%$reports))) {
-        next if($_ eq 'reportSelected');
-        $Str .= '<option name="'.$_.'"';
-        if($reports->{'reportSelected'} eq $reports->{$_}) {
-            $Str .= ' selected=""';
+        $Str .= '<option value="'.$_.'"';
+        if($current eq $_) {
+            $Str .= ' selected';
         }
         $Str .= '>'.$reports->{$_}.'</option>'."\n";
     }
     $Str .= '</select></td>'."\n";
-
+    #
     $Str .= '<td align="center">';
     $Str .= &Apache::lonhtmlcommon::StatusOptions($status, 'Statistics');
     $Str .= '</td>'."\n";
-
+    #
     $Str .= '</tr></tbody></table>'."\n";
     $Str .= '<hr>'."\n";
-
+    #
     return $Str;
 }
 
-sub BuildStatistics {
-    my ($r)=@_;
-
-    my $c = $r->connection;
-    my @studentInformation=('fullname','section','id','domain','username',
-                            'updateTime');
-    my @headings=('Full Name', 'Section', 'PID', 'Domain', 'User Name',
-                  'Last Updated');
-    my $spacing = '   ';
-
-    my %reports = ('classlist'          => 'Class list',
-                   'problem_statistics' => 'Problem Statistics',
-                   'student_assessment' => 'Student Assessment',
-		   'percentage'         => 'Correct-problems Plot',
-#                   'activitylog'        => 'Activity Log',
-                   'reportSelected'     => 'Class list');
-
-    my %cache;
-    my $courseID=$ENV{'request.course.id'};
-    my $cacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                  "_$ENV{'user.domain'}_$courseID\_statistics.db";
-
-    $r->print(&Apache::lonhtmlcommon::Title('Course Statistics and Charts'));
-
-    my ($returnValue, $students) = &PrepareData($c, $cacheDB,
-                                                \@studentInformation,
-                                                \@headings,$r);
-    if($returnValue ne 'OK') {
-        $r->print($returnValue."\n".'</body></html>');
-        return OK;
-    }
-    if(!$c->aborted()) {
-        &Apache::loncoursedata::CheckForResidualDownload($cacheDB,
-                                                         'true', 'true',
-                                                         $courseID,
-                                                         $r, $c);
-    }
-
-    my $GoToPage;
-    if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
-        $GoToPage = $cache{'reportSelected'};
-        $reports{'reportSelected'} = $cache{'reportSelected'};
-        if(defined($cache{'reportKey'}) &&
-           !exists($reports{$cache{'reportKey'}}) &&
-           $cache{'reportKey'} ne 'false') {
-            $reports{$cache{'reportKey'}} = $cache{'reportSelected'};
-        }
-
-        if(defined($cache{'OptionResponses'})) {
-            $reports{'problem_analysis'} = 'Option Response Analysis';
-        }
-
-        $r->print('<form name="Statistics" ');
-        $r->print('method="post" action="/adm/statistics">');
-        $r->print(&CreateMainMenu($cache{'Status'}, \%reports));
-        $r->rflush();
-        untie(%cache);
-    } else {
-        $r->print('<html><body>Unable to tie database.</body></html>');
-        return OK;
-    }
-
-    if($GoToPage eq 'Activity Log') {
-        &Apache::lonproblemstatistics::Activity();
-    } elsif($GoToPage eq 'Problem Statistics') {
-        &Apache::lonproblemstatistics::BuildProblemStatisticsPage($cacheDB,
-                                                                  $students,
-                                                                  $courseID,
-                                                                  $c,$r);
-    } elsif($GoToPage eq 'Option Response Analysis') {
-        &Apache::lonproblemanalysis::BuildProblemAnalysisPage($cacheDB, $r);
-    } elsif($GoToPage eq 'Student Assessment') {
-        &Apache::lonstudentassessment::BuildStudentAssessmentPage($r, $c);
-    } elsif($GoToPage eq 'Analyze') {
-        &Apache::lonproblemanalysis::BuildAnalyzePage($cacheDB, $students,
-                                                      $courseID, $r);
-    } elsif($GoToPage eq 'DoDiffGraph' || $GoToPage eq 'PercentWrongGraph') {
-        my $courseDescription = $ENV{'course.'.$courseID.'.description'};
-        $courseDescription =~ s/\ /"_"/eg;
-        &Apache::lonproblemstatistics::BuildGraphicChart($GoToPage, $cacheDB,
-                                                         $courseDescription,
-                                                         $students, $courseID,
-                                                         $r, $c);
-    } elsif($GoToPage eq 'Class list') {
-        &DisplayClasslist($r);
-#        &BuildClasslist($cacheDB, $students, \@studentInformation,
-#                        \@headings, $r);
-    } elsif($GoToPage eq 'Correct-problems Plot') {
-	&Apache::lonpercentage::BuildPercentageGraph($cacheDB, $students,
-						     $courseID, $c, $r);
-    }
-
-    $r->print('</form>'."\n");
-    $r->print("\n".'</body>'."\n".'</html>');
-    $r->rflush();
-
-    return OK;
-}
-
-# ================================================================ Main Handler
-
+##############################################
+##############################################
 sub handler {
     my $r=shift;
-
-#    $jr = $r;
-
+    my $c = $r->connection();
+    #
+    # Check for overloading
     my $loaderror=&Apache::lonnet::overloaderror($r);
     if ($loaderror) { return $loaderror; }
     $loaderror=
        &Apache::lonnet::overloaderror($r,
          $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
     if ($loaderror) { return $loaderror; }
-
+    #
+    # Check for access
     unless(&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
         $ENV{'user.error.msg'}=
         $r->uri.":vgr:0:0:Cannot view grades for complete course";
         return HTTP_NOT_ACCEPTABLE;
     }
-
+    #
     # Set document type for header only
     if($r->header_only) {
         if ($ENV{'browser.mathml'}) {
@@ -1438,35 +891,80 @@
         $r->send_http_header;
         return OK;
     }
-
-    unless($ENV{'request.course.fn'}) {
-	my $requrl=$r->uri;
-        $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
-        return HTTP_NOT_ACCEPTABLE;
-    }
-
+    #
+    # Send the header
     $r->content_type('text/html');
     $r->send_http_header;
-
+    #
+    # Extract form elements from query string
     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
-                                            ['sort',
+                                            ['sort','reportSelected',
                                              'StudentAssessmentStudent']);
-
+    if (! exists($ENV{'form.reportSelected'})) {
+        $ENV{'form.reportSelected'} = 'student_assessment';
+    }
+    #
+    # Give the LON-CAPA page header
+    $r->print(&Apache::lonhtmlcommon::Title('Course Statistics and Charts'));
+    $r->rflush();
+    #
+    # Set up the statistics and chart environment
     &PrepareClasslist($r);
-
     &PrepareCourseData($r);
-
-    &BuildStatistics($r);
-
+    #
+    # Begin form output
+    $r->print('<form name="Statistics" ');
+    $r->print('method="post" action="/adm/statistics">');
+    #
+    # Print main menu
+    my %reports = ('classlist'          => 'Class list',
+                   'problem_statistics' => 'Problem Statistics',
+                   'student_assessment' => 'Student Assessment',
+                   'percentage'         => 'Correct-problems Plot',
+                   'option_response'    => 'Option Response Analysis',
+#                   'activitylog'        => 'Activity Log',
+                   );
+    $r->print(&CreateMainMenu($ENV{'form.status'},
+                              \%reports,$ENV{'form.reportSelected'}));
+    $r->rflush();
+    #
+    my $GoToPage = $ENV{'form.reportSelected'};
+    if($GoToPage eq 'activitylog') {
+#        &Apache::lonproblemstatistics::Activity();
+    } elsif($GoToPage eq 'problem_statistics') {
+        &Apache::lonproblemstatistics::BuildProblemStatisticsPage($r,$c);
+    } elsif($GoToPage eq 'option_response') {
+#        &Apache::lonproblemanalysis::BuildProblemAnalysisPage($r,$c);
+    } elsif($GoToPage eq 'student_assessment') {
+        &Apache::lonstudentassessment::BuildStudentAssessmentPage($r,$c);
+    } elsif($GoToPage eq 'DoDiffGraph' || $GoToPage eq 'PercentWrongGraph') {
+#        &Apache::lonproblemstatistics::BuildGraphicChart($r,$c);
+    } elsif($GoToPage eq 'classlist') {
+        &DisplayClasslist($r);
+    } elsif($GoToPage eq 'Correct-problems Plot') {
+#	&Apache::lonpercentage::BuildPercentageGraph($r,$c);
+    }
+    #
+    $r->print("</form>\n");
+    $r->print("</body>\n</html>\n");
+    $r->rflush();
+    #
     return OK;
 }
+
 1;
 
+#######################################################
+#######################################################
+
 =pod
 
 =back
 
 =cut
+
+#######################################################
+#######################################################
 
 __END__
 

--matthew1048630825--