--- loncom/interface/lonstatistics.pm	2008/11/10 13:20:14	1.143
+++ loncom/interface/lonstatistics.pm	2023/09/07 23:58:32	1.156.2.8.2.1
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonstatistics.pm,v 1.143 2008/11/10 13:20:14 jms Exp $
+# $Id: lonstatistics.pm,v 1.156.2.8.2.1 2023/09/07 23:58:32 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -28,22 +28,7 @@
 #
 ###
 
-=pod
-
-=head1 NAME
-
-lonstatistics
-
-=head1 SYNOPSIS
-
-Main handler for statistics and chart.
-
-This is part of the LearningOnline Network with CAPA project
-described at http://www.lon-capa.org.
-
-=over 4
 
-=cut
 
 package Apache::lonstatistics;
 
@@ -79,35 +64,9 @@ use Apache::lonpercentage;
 use Apache::lonstudentsubmissions();
 use Apache::lonsurveyreports();
 use Apache::longradinganalysis();
+use Apache::lonquickgrades();
 use LONCAPA;
 
-#######################################################
-#######################################################
-
-=pod
-
-=item Package Variables
-
-=item @FullClasslist The full classlist
-
-=item @Students The students we are concerned with for this invocation
-
-=item @Sections The sections available in this class
-
-=item @Groups The groups available in the class
-
-=item $curr_student The student currently being examined
-
-=item $prev_student The student previous in the classlist
-
-=item $next_student The student next in the classlist
-
-=over
-
-=cut 
-
-#######################################################
-#######################################################
 #
 # Classlist variables
 #
@@ -115,43 +74,7 @@ my $curr_student;
 my $prev_student;
 my $next_student;
 
-#######################################################
-#######################################################
-
-=pod
-
-=item &clear_classlist_variables()
-
-undef the following package variables:
-
-=over
-
-=item @FullClasslist
-
-=item @Students
-
-=item @Sections
-
-=item @Groups
-
-=item %StudentData
-
-=item @StudentDataOrder
-
-=item @SelectedStudentData
-
-=item $curr_student
-
-=item $prev_student
-
-=item $next_student
-
-=back
-
-=cut
 
-#######################################################
-#######################################################
 sub clear_classlist_variables {
     undef(@FullClasslist);
     undef(@Students);
@@ -164,45 +87,7 @@ sub clear_classlist_variables {
     undef($next_student);
 }
 
-#######################################################
-#######################################################
-
-=pod
-
-=item &PrepareClasslist()
-
-Build up the classlist information.  The classlist information is kept in
-the following package variables:
-
-=over
-
-=item @FullClasslist
-
-=item @Students
-
-=item @Sections
-
-=item @Groups 
-
-=item %StudentData
-
-=item @SelectedStudentData
-
-=item $curr_student
-
-=item $prev_student
-
-=item $next_student
-
-=back
-
-$curr_student, $prev_student, and $next_student may not be defined, depending
-upon the calling context.
-
-=cut
 
-#######################################################
-#######################################################
 sub PrepareClasslist {
     my %Sections;
     &clear_classlist_variables();
@@ -377,19 +262,7 @@ sub PrepareClasslist {
     return;
 }
 
-#######################################################
-#######################################################
 
-=pod
-
-=item get_selected_sections
-
-Returns an array of the selected sections
-
-=cut
-
-#######################################################
-#######################################################
 sub get_selected_sections {
     my @selected_sections = 
 	&Apache::loncommon::get_env_multiple('form.Section');
@@ -407,19 +280,7 @@ sub get_selected_sections {
     return @selected_sections;
 }
 
-#######################################################
-#######################################################
-                                                                                    
-=pod
-                                                                                    
-=item get_selected_groups
-                                                                                    
-Returns an array of the selected groups
-                                                                                    
-=cut
-                                                                                    
-#######################################################
-#######################################################
+
 sub get_selected_groups {
     my @selected_groups =
         &Apache::loncommon::get_env_multiple('form.Group');
@@ -433,21 +294,8 @@ sub get_selected_groups {
     return @selected_groups;
 }
                                                                                     
-=pod
 
-=item &section_and_enrollment_description
 
-Returns a string describing the currently selected section(s), group(s) and 
-access status.  
-
-Inputs: mode = 'plaintext' or 'localized'  (defaults to 'localized')
-    'plaintext' is used for example in Excel spreadsheets.
-Returns: scalar description string.
-
-=cut
-
-#######################################################
-#######################################################
 sub section_and_enrollment_description {
     my ($mode) = @_;
     if (! defined($mode)) { $mode = 'localized'; }
@@ -472,8 +320,8 @@ sub section_and_enrollment_description {
     return $description;
 }
 
-#######################################################
-#######################################################
+
+
 
 sub section_or_group_text {
     my ($mode,$type,@items) = @_;
@@ -516,101 +364,33 @@ sub section_or_group_text {
 }
 
 
-=pod
-
-=item get_students
-
-Returns a list of the selected students
-
-=cut
-
-#######################################################
-#######################################################
 sub get_students {
     if (! @Students) {
-        &PrepareClasslist()
+        &PrepareClasslist();
     }
     return @Students;
 }
 
-#######################################################
-#######################################################
-
-=pod
-
-=item &current_student()
-
-Returns a pointer to a hash containing data about the currently
-selected student.
 
-=cut
 
-#######################################################
-#######################################################
 sub current_student { 
     return $curr_student;
 }
 
-#######################################################
-#######################################################
-
-=pod
-
-=item &previous_student()
-
-Returns a pointer to a hash containing data about the student prior
-in the list of students.  Or something.  
 
-=cut
 
-#######################################################
-#######################################################
 sub previous_student { 
     return $prev_student;
 }
 
-#######################################################
-#######################################################
 
-=pod
-
-=item &next_student()
 
-Returns a pointer to a hash containing data about the next student
-to be viewed.
-
-=cut
-
-#######################################################
-#######################################################
 sub next_student { 
     return $next_student;
 }
 
-##############################################
-##############################################
-
-=pod 
-
-=item &StudentDataSelect($elementname,$status,$numvisible,$selected)
-
-Returns html for a selection box allowing the user to choose one (or more) 
-of the fields of student data available (fullname, username, id, section, etc)
-
-=over 4
-
-=item $elementname The name of the HTML form element
-
-=item $status 'multiple' or 'single' selection box
 
-=item $numvisible The number of options to be visible
 
-=back
-
-=cut
-
-##############################################
-##############################################
 sub StudentDataSelect {
     my ($elementname,$status,$numvisible)=@_;
     if ($numvisible < 1) {
@@ -621,51 +401,37 @@ sub StudentDataSelect {
     my $Str = "\n";
     $Str .= '<select name="'.$elementname.'" ';
     if ($status ne 'single') {
-        $Str .= 'multiple="true" ';
+        $Str .= 'multiple="multiple" ';
     }
     $Str .= 'size="'.$numvisible.'" >'."\n";
     #
     # Deal with 'all'
-    $Str .= '    <option value="all" ';
+    $Str .= '    <option value="all"';
     foreach (@SelectedStudentData) {
         if ($_ eq 'all') {
-            $Str .= 'selected ';
+            $Str .= ' selected="selected"';
             last;
         }
     }
-    $Str .= ">all</option>\n";
+    $Str .= '>'.&mt('all')."</option>\n";
     #
     # Loop through the student data fields
     foreach my $item (@StudentDataOrder) {
-        $Str .= '    <option value="'.$item.'" ';
+        $Str .= '    <option value="'.$item.'"';
         foreach (@SelectedStudentData) {
             if ($item eq $_ ) {
-                $Str .= 'selected ';
+                $Str .= ' selected="selected"';
                 last;
             }
         }
-        $Str .= '>'.$item."</option>\n";
+        $Str .= '>'.&mt($item)."</option>\n";
     }
     $Str .= "</select>\n";
     return $Str;
 }
 
-#######################################################
-#######################################################
 
-=pod
-
-=item &get_selected_maps($elementname)
 
-Input: Name of the <select> form element used to specify the maps.
-
-Returns: Array of symbs of selected maps or the description 'all'.
-   If form.$elementname does not exist, 'all' is returned.
-
-=cut
-
-#######################################################
-#######################################################
 sub get_selected_maps {
     my ($elementname) = @_;
     my @selected_maps = 
@@ -681,25 +447,8 @@ sub get_selected_maps {
 }
 
 
-#######################################################
-#######################################################
-
-=pod
-
-=item &selected_sequences_with_assessments
-
-Retrieve the sequences which were selected by the user to show.  
-
-Input: $mode: scalar.  Either 'selected' or 'all'.  If not specified,
-    'selected' is used.
-
-Returns: an array containing a navmap object and navmap resources, 
-    or an array containing a scalar with an error message.
 
-=cut
 
-#######################################################
-#######################################################
 sub selected_sequences_with_assessments {
     my ($mode) = @_;
     $mode = 'selected' if (! defined($mode));
@@ -717,7 +466,7 @@ sub selected_sequences_with_assessments
 
     my @sequences_with_assessments;
     foreach my $sequence (@sequences) {
-	if ($navmap->hasResource($sequence,sub { shift->is_problem(); },0,1)){
+	if ($navmap->hasResource($sequence,sub { shift->is_gradable(); },0,1)){
             push(@sequences_with_assessments,$sequence);
         }
     }
@@ -739,31 +488,7 @@ sub selected_sequences_with_assessments
     return $navmap,@sequences_to_show;
 }
 
-##############################################
-##############################################
-
-=pod 
-
-=item &map_select($elementname,$status,$numvisible,$restriction) 
-
-Returns html for a selection box allowing the user to choose one (or more) 
-of the sequences in the course.  The values of the sequences are the symbs.
-If the top sequence is selected, the value 'top' will result.
-
-=over 4
-
-=item $elementname The name of the HTML form element
-
-=item $status 'multiple' or 'single' selection box
-
-=item $numvisible The number of options to be visible
-
-=back
-
-=cut
 
-##############################################
-##############################################
 sub map_select {
     my ($elementname,$status,$numvisible)=@_;
     if ($numvisible < 1) {
@@ -777,16 +502,16 @@ sub map_select {
     my $form = "\n";
     $form .= '<select name="'.$elementname.'" ';
     if ($status ne 'single') {
-        $form .= 'multiple="true" ';
+        $form .= 'multiple="multiple" ';
     }
     $form .= 'size="'.$numvisible.'" >'."\n";
     #
     # Put in option for 'all'
-    $form .= '    <option value="all" ';
+    $form .= '    <option value="all"';
     if ($selected_maps[0] eq 'all') {
-        $form .= 'selected ';
+        $form .= ' selected="selected"';
     }
-    $form .= ">all</option>\n";
+    $form .= '>'.&mt('all').'</option>'."\n";
     #
     # Loop through the sequences
     my @sequences = &selected_sequences_with_assessments('all');
@@ -797,10 +522,10 @@ sub map_select {
         $navmap = shift(@sequences);
     }
     foreach my $seq (@sequences){
-        $form .= '    <option value="'.$seq->symb.'" ';
+        $form .= '    <option value="'.$seq->symb.'"';
         foreach (@selected_maps) {
             if ($seq->symb eq $_) {
-                $form .= 'selected ';
+                $form .= ' selected="selected"';
                 last;
             }
         }
@@ -810,31 +535,7 @@ sub map_select {
     return $form;
 }
 
-##############################################
-##############################################
-
-=pod 
-
-=item &SectionSelect($elementname,$status,$numvisible) 
-
-Returns html for a selection box allowing the user to choose one (or more) 
-of the sections in the course.  
-
-Uses the package variables @Sections
-=over 4
-
-=item $elementname The name of the HTML form element
-
-=item $status 'multiple' or 'single' selection box
-
-=item $numvisible The number of options to be visible
 
-=back
-
-=cut
-
-##############################################
-##############################################
 sub SectionSelect {
     my ($elementname,$status,$numvisible)=@_;
     if ($numvisible < 1) {
@@ -846,20 +547,25 @@ sub SectionSelect {
         &PrepareClasslist()
     }
     #
+    # Make sure course's student table is up to date
+    if (@Sections) {
+        &Apache::loncoursedata::ensure_current_sections();
+    }
+    #
     # Build the form element
     my $Str = "\n";
     $Str .= '<select name="'.$elementname.'" ';
     if ($status ne 'single') {
-        $Str .= 'multiple="true" ';
+        $Str .= 'multiple="multiple" ';
     }
     $Str .= 'size="'.$numvisible.'" >'."\n";
     #
     # Loop through the sequences
     foreach my $s (@Sections) {
-        $Str .= '    <option value="'.$s.'" ';
+        $Str .= '    <option value="'.$s.'"';
         foreach (&get_selected_sections()) {
             if ($s eq $_) {
-                $Str .= 'selected ';
+                $Str .= ' selected="selected"';
                 last;
             }
         }
@@ -869,31 +575,7 @@ sub SectionSelect {
     return $Str;
 }
 
-##############################################
-##############################################
-                                                                                    
-=pod
-                                                                                    
-=item &GroupSelect($elementname,$status,$numvisible)
-                                                                                    
-Returns html for a selection box allowing the user to choose one (or more)
-of the groups in the course.
-                                                                                    
-Uses the package variables @Groups
-=over 4
-                                                                                    
-=item $elementname The name of the HTML form element
-                                                                                    
-=item $status 'multiple' or 'single' selection box
-                                                                                    
-=item $numvisible The number of options to be visible
-                                                                                    
-=back
-                                                                                    
-=cut
-                                                                                    
-##############################################
-##############################################
+
 sub GroupSelect {
     my ($elementname,$status,$numvisible)=@_;
     if ($numvisible < 1) {
@@ -905,20 +587,28 @@ sub GroupSelect {
         &PrepareClasslist();
     }
     #
+    # Make sure course's groupnames and studentgroups tables
+    # are up to date.
+    #
+    if (@Groups) {
+        &Apache::loncoursedata::ensure_current_groups();
+        &Apache::loncoursedata::ensure_current_students_groups();
+    }
+    #
     # Build the form element
     my $Str = "\n";
     $Str .= '<select name="'.$elementname.'" ';
     if ($status ne 'single') {
-        $Str .= 'multiple="true" ';
+        $Str .= 'multiple="multiple" ';
     }
     $Str .= 'size="'.$numvisible.'" >'."\n";
     #
     # Loop through the groups
     foreach my $s (@Groups) {
-        $Str .= '    <option value="'.$s.'" ';
+        $Str .= '    <option value="'.$s.'"';
         foreach my $group (&get_selected_groups()) {
             if ($s eq $group) {
-                $Str .= 'selected ';
+                $Str .= ' selected="selected"';
                 last;
             }
         }
@@ -928,8 +618,8 @@ sub GroupSelect {
 }
 
 
-##################################################
-##################################################
+
+
 sub DisplayClasslist {
     my ($r)=@_;
     &Apache::lonhtmlcommon::add_breadcrumb
@@ -938,7 +628,7 @@ sub DisplayClasslist {
     # Output some of the standard interface components
     my $Str;
     $Str .= &Apache::lonhtmlcommon::breadcrumbs('Select One Student');
-    $Str .= '<p><table cellspacing="5">'."\n";
+    $Str .= '<table cellspacing="5">'."\n";
     $Str .= '<tr>';
     $Str .= '<th align="center"><b>'.&mt('Sections').'</b></th>';
     $Str .= '<th align="center"><b>'.&mt('Groups').'</b></th>';
@@ -956,7 +646,7 @@ sub DisplayClasslist {
         '</td>';
     
     $Str .= '</tr>'.$/;
-    $Str .= '</table></p>';
+    $Str .= '</table>';
     $Str .= '<input type="submit" name="selectstudent" value="'.
         &mt('Update Display').'" />';
     $r->print($Str);
@@ -1014,13 +704,13 @@ sub DisplayClasslist {
     }
 
     $Str .= '<h2>'.&mt('Select One Student').'</h2>'
-           .'<p>'.&mt("Click on a student's name or username to view their chart").'</p>'
+           .'<p>'.&mt("Click on a student's name or username to view their chart.").'</p>'
            .&Apache::loncommon::start_data_table()
            .&Apache::loncommon::start_data_table_header_row();
     foreach my $field (@Fields) {
         $Str .= '<th><a href="/adm/statistics?'.
-            'reportSelected=student_assessment&'.
-            'selectstudent=1&'.
+            'reportSelected=student_assessment&amp;'.
+            'selectstudent=1&amp;'.
             'sort='.$field.'">'.&mt($field).
             '</a></th>';
     }
@@ -1035,15 +725,19 @@ sub DisplayClasslist {
             if ($field eq 'fullname' || $field eq 'username') {
                 $Str .= '<a href="/adm/statistics?reportSelected=';
                 $Str .= &escape('student_assessment');
-                $Str .= '&sort='.&escape($env{'form.sort'});
-                $Str .= '&SelectedStudent=';
+                $Str .= '&amp;sort='.&escape($env{'form.sort'});
+                $Str .= '&amp;SelectedStudent=';
                 $Str .= &escape($sname).'">';
-                $Str .= $student->{$field}.'&nbsp';
+                $Str .= $student->{$field};
                 $Str .= '</a>';
             } elsif ($field eq 'status') {
                 $Str .= &mt($student->{$field});
             } else {
-                $Str .= $student->{$field};
+                if ($student->{$field} eq 'none') {
+                    $Str .= &mt('none')
+                } else {
+                    $Str .= $student->{$field};
+                }
             }
             $Str .= '</td>';
         }
@@ -1057,84 +751,65 @@ sub DisplayClasslist {
     return;
 }
 
-##############################################
-##############################################
+
+
 sub CreateMainMenu {
     #
     # Define menu data
-    my @reports = ({ internal_name => 'problem_statistics',
-                     name => &mt('Overall Problem Statistics'),
-                     short_description => 
-    &mt('Student performance statistics on all problems.'),
-                 },
-                   { internal_name => 'problem_analysis',
-                     name => &mt('Detailed Problem Analysis'),
-                     short_description => 
-    &mt('Detailed statistics and graphs of student performance on problems.'),
-                 },
-                   { internal_name => 'submissiontime_analysis',
-                     name => &mt('Submission Time Plots'),
-                     short_description => 
-    &mt('Display and analysis of submission times on assessments.'),
-                 },
-                   { internal_name => 'student_submission_reports',
-                     name => &mt('Student Submission Reports'),
-                     short_description => 
-    &mt('Prepare reports of student submissions.'),
-                 },
-                   { internal_name => 'survey_reports',
-                     name => &mt('Survey Reports'),
-                     short_description => 
-    &mt('Prepare reports on survey results.'),
-                 },
-                   { internal_name => 'correct_problems_plot',
-                     name => &mt('Correct Problems Plot'),
-                     short_description => 
-    &mt('Display a histogram of student performance in the course.'),
-                 },
-#                   { internal_name => 'grading_analysis',
-#                     name => &mt('Detailed Grading Analysis'),
-#                     short_description => 
-#    &mt('Display statistics about who graded who.'),
-#                 },
-#                   { internal_name => 'student_assessment',
-#                     name => &mt('Problem Status Chart'),
-#                     short_description => 
-#    &mt('Brief view of each students performance in course.'),
-#                 },
-                   # 'percentage'  => 'Correct-problems Plot',
-                   # 'activitylog' => 'Activity Log',
-                   );
-    #
-    # Create the menu
-    my $Str;
-    $Str .= '<h2>'.&mt('Please select a report to generate').'</h2>';
-    foreach my $reportdata (@reports) {
-        $Str .='    <h3><a href="/adm/statistics?reportSelected='.
-            $reportdata->{'internal_name'}.'" >'.
-            $reportdata->{'name'}."</a></h3>\n";
-        $Str .= '    '.('&nbsp;'x8).$reportdata->{'short_description'}.
-            "\n";
-    }
-    $Str .="</dl>\n";
-    #
-    return $Str;
+    my @reports = (
+	    {categorytitle => 'Statistics and Analyses',
+         items => [
+            {url => '/adm/statistics?reportSelected=problem_statistics',
+			 permission => 'F',
+             icon => 'document-open.png',
+             linktext => ('Overall Problem Statistics'),
+             linktitle => ('Student performance statistics on all problems.')},
+       
+            {url => '/adm/statistics?reportSelected=problem_analysis',
+			 permission => 'F',
+             icon => 'prob_ana.png',
+             linktext => ('Detailed Problem Analysis'),
+             linktitle => ('Detailed statistics and graphs of student performance on problems.')},
+         ]},
+        {categorytitle => 'Plots',
+         items => [
+            {url => '/adm/statistics?reportSelected=submissiontime_analysis',
+			 permission => 'F',
+             icon => 'subtimpl.png',
+             linktext => ('Submission Time Plots'),
+             linktitle => ('Display and analysis of submission times on assessments.')},
+      
+            {url => '/adm/statistics?reportSelected=correct_problems_plot',
+			 permission => 'F',
+             icon => 'coprplot.png',
+             linktext => ('Correct Problems Plot'),
+             linktitle => ('Display a histogram of student performance in the course.')},
+         ]},
+        {categorytitle => 'Reports',
+         items => [
+            {url => '/adm/statistics?reportSelected=student_submission_reports',
+			 permission => 'F',
+             icon => 'edit-copy.png',
+             linktext => ('Student Submission Reports'),
+             linktitle => ('Prepare reports of student submissions.')},
+                    
+            {url => '/adm/statistics?reportSelected=survey_reports',
+			 permission => 'F',
+             icon => 'survey_rep.png',
+			 linktext => ('Survey Reports'),
+             linktitle => ('Prepare reports on survey results.')},
+         ]});
+    
+return &Apache::lonhtmlcommon::generate_menu(@reports);
+ 
 }
 
-##############################################
-##############################################
+
+
 sub handler {
     my $r=shift;
     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 $loaderror; }
-    #
     # Check for access
     if (! &Apache::lonnet::allowed('vgr',$env{'request.course.id'})) {
         $env{'user.error.msg'}=
@@ -1157,6 +832,8 @@ sub handler {
     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
                                             ['sort','reportSelected',
                                              'SelectedStudent']);
+    my $GoToPage = $env{'form.reportSelected'};
+
     #
     # Give the LON-CAPA page header
     my $style = <<ENDSTYLE;
@@ -1167,9 +844,39 @@ sub handler {
     td.essay          { border: 1px solid gray; }
 </style>
 ENDSTYLE
+
+    my $head_extra = $style;
+    if (($env{'form.reportSelected'} eq 'student_submission_reports') &&
+        ($env{'form.renderprob'})) {
+        my @Symbs = &Apache::lonstathelpers::get_selected_symbs('problemchoice');
+        if (scalar(@Symbs) == 1) {
+            $head_extra .= &Apache::loncommon::css_links($Symbs[0]);
+        }
+    } elsif ($env{'form.reportSelected'} eq 'submissiontime_analysis') {
+        my ($navmap,$current_problem) =
+            &Apache::lonsubmissiontimeanalysis::get_current_problem();
+        if (ref($current_problem) eq 'HASH') {
+            my $symb = $current_problem->{'symb'};
+            if ($symb) {
+                $head_extra .= &Apache::loncommon::css_links($symb);
+            }
+        }
+    } elsif (($env{'form.reportSelected'} eq 'problem_analysis') &&
+              ($env{'form.show_prob'})) {
+        my $problem_types = &Apache::lonproblemanalysis::analyzable_types();
+        my ($navmap,$current_problem) =
+            &Apache::lonproblemanalysis::get_current_problem($problem_types);
+        if (ref($current_problem) eq 'HASH') {
+            my $symb = $current_problem->{'symb'};
+            my $res = $current_problem->{'resource'};
+            if ($symb) {
+                $head_extra .= &Apache::loncommon::css_links($symb);
+            }
+        }
+    }
       
     $r->print(&Apache::loncommon::start_page('Course Statistics and Charts',
-					     $style));
+					     $head_extra));
     $r->rflush();
     # 
     # Either print out a menu for them or send them to a report
@@ -1179,24 +886,23 @@ ENDSTYLE
                                             text =>'Statistics',
                                             faq=>139,
                                             bug=>'Statistics and Charts'});
-    if (! exists($env{'form.reportSelected'}) || 
-        $env{'form.reportSelected'} eq '') {
+    if ($GoToPage eq '') {
         $r->print(&Apache::lonhtmlcommon::breadcrumbs('Statistics Main Page').
                   &CreateMainMenu());
     } else {
     #
         if (! &Apache::lonmysql::verify_sql_connection()) {
             my $serveradmin = $r->dir_config('lonAdmEMail');
-            $r->print('<h2 class="LC_error">'.
+            $r->print('<p class="LC_error">'.
                       &mt('Unable to connect to database!').
-                      '</h2>');
+                      '</p>');
             $r->print('<p>'
                      .&mt('Please notify the server administrator [_1]',
                          ,'<b>'.$serveradmin.'</b>')
                      .'</p>');
             $r->print('<p>'.
                       &mt('Course Statistics and Charts cannot be '.
-                          'retrieved until the database is restarted.  '.
+                          'retrieved until the database is restarted. '.
                           'Your data is intact but cannot be displayed '.
                           'at this time.').'</p>');
             $r->print(&Apache::loncommon::end_page());
@@ -1205,18 +911,18 @@ ENDSTYLE
         #
         # Clean out the caches
         if (exists($env{'form.ClearCache'})) {
-            &Apache::loncoursedata::delete_caches($env{'requres.course.id'});
+            &Apache::loncoursedata::delete_caches($env{'request.course.id'});
         }
         #
         # Begin form output
         $r->print('<form name="Statistics" ');
+        if ($GoToPage eq 'student_submission_reports') {
+            $r->print('onsubmit="return checkanon();" ');
+        }
         $r->print('method="post" action="/adm/statistics">');
         $r->rflush();
-        #
-        my $GoToPage = $env{'form.reportSelected'};
-        #
         $r->print('<input type="hidden" name="reportSelected" value="'.
-                  $GoToPage.'">');
+                  $GoToPage.'" />');
         if($GoToPage eq 'activitylog') {
 #        &Apache::lonproblemstatistics::Activity();
         } elsif($GoToPage eq 'problem_statistics') {
@@ -1275,17 +981,227 @@ ENDSTYLE
 
 1;
 
-#######################################################
-#######################################################
+__END__
 
 =pod
 
+=head1 NAME
+
+lonstatistics
+
+=head1 SYNOPSIS
+
+Main handler for statistics and chart.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+
+=head1 PACKAGE VARIABLES
+
+=over
+
+=item @FullClasslist The full classlist
+
+=item @Students The students we are concerned with for this invocation
+
+=item @Sections The sections available in this class
+
+=item @Groups The groups available in the class
+
+=item $curr_student The student currently being examined
+
+=item $prev_student The student previous in the classlist
+
+=item $next_student The student next in the classlist
+
 =back
 
-=cut
+=head1 SUBROUTINES
 
-#######################################################
-#######################################################
+=over
 
-__END__
+=item &clear_classlist_variables()
+
+undef the following package variables:
+
+=over 4
+
+=item * @FullClasslist
+
+=item * @Students
+
+=item * @Sections
+
+=item * @Groups
+
+=item * %StudentData
+
+=item * @StudentDataOrder
+
+=item * @SelectedStudentData
+
+=item * $curr_student
+
+=item * $prev_student
+
+=item * $next_student
+
+=back
+
+=item &PrepareClasslist()
+
+Build up the classlist information.  The classlist information is kept in
+the following package variables:
+
+=over 4 
+
+=item * @FullClasslist
+
+=item * @Students
+
+=item * @Sections
+
+=item * @Groups 
+
+=item * %StudentData
+
+=item * @SelectedStudentData
+
+=item * $curr_student
+
+=item * $prev_student
+
+=item * $next_student
+
+=back
+
+$curr_student, $prev_student, and $next_student may not be defined, depending
+upon the calling context.
+
+=item get_selected_sections()
+
+Returns an array of the selected sections
+
+=item get_selected_groups()
+                                                                                    
+Returns an array of the selected groups
+
+=item &section_and_enrollment_description()
+
+Returns a string describing the currently selected section(s), group(s) and 
+access status.  
+
+Inputs: mode = 'plaintext' or 'localized'  (defaults to 'localized')
+    'plaintext' is used for example in Excel spreadsheets.
+Returns: scalar description string.
+
+=item section_or_group_text()
+
+=item get_students()
+
+Returns a list of the selected students
+
+=item &current_student()
+
+Returns a pointer to a hash containing data about the currently
+selected student.
+
+=item &previous_student()
+
+Returns a pointer to a hash containing data about the student prior
+in the list of students.  Or something. 
+
+=item &next_student()
+
+Returns a pointer to a hash containing data about the next student
+to be viewed. 
+
+=item &StudentDataSelect($elementname,$status,$numvisible,$selected)
+
+Returns html for a selection box allowing the user to choose one (or more) 
+of the fields of student data available (fullname, username, id, section, etc)
+
+=over 4
+
+=item * $elementname The name of the HTML form element
+
+=item * $status 'multiple' or 'single' selection box
+
+=item * $numvisible The number of options to be visible
+
+=back
+
+=item &get_selected_maps($elementname)
+
+Input: Name of the <select> form element used to specify the maps.
+
+Returns: Array of symbs of selected maps or the description 'all'.
+   If form.$elementname does not exist, 'all' is returned.
+
+=item &selected_sequences_with_assessments()
+
+Retrieve the sequences which were selected by the user to show.  
+
+Input: $mode: scalar.  Either 'selected' or 'all'.  If not specified,
+    'selected' is used.
+
+Returns: an array containing a navmap object and navmap resources, 
+    or an array containing a scalar with an error message.
+
+=item &map_select($elementname,$status,$numvisible,$restriction) 
+
+Returns html for a selection box allowing the user to choose one (or more) 
+of the sequences in the course.  The values of the sequences are the symbs.
+If the top sequence is selected, the value 'top' will result.
+
+=over 4
+
+=item * $elementname The name of the HTML form element
+
+=item * $status 'multiple' or 'single' selection box
+
+=item * $numvisible The number of options to be visible
+
+=back
+
+=item &SectionSelect($elementname,$status,$numvisible) 
+
+Returns html for a selection box allowing the user to choose one (or more) 
+of the sections in the course.  
+
+Uses the package variables @Sections
+
+=over 4
+
+=item * $elementname The name of the HTML form element
+
+=item * $status 'multiple' or 'single' selection box
+
+=item * $numvisible The number of options to be visible
+
+=back
+
+=item &GroupSelect($elementname,$status,$numvisible)
+                                                                                    
+Returns html for a selection box allowing the user to choose one (or more)
+of the groups in the course.
+                                                                                    
+Uses the package variables @Groups
+
+=over 4
+                                                                                    
+=item * $elementname The name of the HTML form element
+                                                                                    
+=item * $status 'multiple' or 'single' selection box
+                                                                                    
+=item * $numvisible The number of options to be visible
+                                                                                    
+=back
+
+=item CreateMainMenu()
+
+=back
+
+=cut