--- loncom/interface/lonstatistics.pm	2003/06/10 19:19:57	1.76
+++ loncom/interface/lonstatistics.pm	2003/08/27 21:33:33	1.79
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonstatistics.pm,v 1.76 2003/06/10 19:19:57 matthew Exp $
+# $Id: lonstatistics.pm,v 1.79 2003/08/27 21:33:33 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -797,6 +797,44 @@ sub SectionSelect {
     return $Str;
 }
 
+###############################################
+###############################################
+
+=pod 
+
+=item &Gather_Student_Data()
+
+Ensures all student data is up to date.
+
+=cut
+
+###############################################
+###############################################
+sub Gather_Student_Data {
+    my ($r) = @_;
+    my $c = $r->connection();
+    #
+    my @Sequences = &Apache::lonstatistics::Sequences_with_Assess();
+    #
+    my @Students = @Apache::lonstatistics::Students;
+    #
+    # Open the progress window
+    my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
+        ($r,'Statistics Compilation Status',
+         'Statistics Compilation Progress', scalar(@Students));
+    #
+    while (my $student = shift @Students) {
+        return if ($c->aborted());
+        my ($status,undef) = &Apache::loncoursedata::ensure_current_data
+            ($student->{'username'},$student->{'domain'},
+             $ENV{'request.course.id'});
+        &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
+                                                 'last student');
+    }
+    &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+    $r->rflush();
+}
+
 ##################################################
 ##################################################
 sub DisplayClasslist {
@@ -805,8 +843,46 @@ sub DisplayClasslist {
     my @Fields = ('fullname','username','domain','id','section');
     #
     my $Str='';
+    if (! @Students) {
+        if ($SelectedSections[0] eq 'all') { 
+            if (lc($ENV{'form.Status'}) eq 'any') {
+                $Str .= '<h2>There are no students in the course.</h2>';
+            } elsif (lc($ENV{'form.Status'}) eq 'active') {
+                $Str .= '<h2>There are no currently enrolled students in '.
+                    'the course.</h2>';
+            } elsif (lc($ENV{'form.Status'}) eq 'expired') {
+                $Str .= '<h2>There are no previously enrolled '.
+                    'students in the course.</h2>';
+            }
+        } else { 
+            my $sections;
+            if (@SelectedSections == 1) {
+                $sections = 'section '.$SelectedSections[0];
+            } elsif (@SelectedSections > 2) {
+                $sections = 'sections '.join(', ',@SelectedSections);
+                $sections =~ s/, ([^,])*$/, and $1/;
+            } else {
+                $sections = 'sections '.join(' and ',@SelectedSections);
+            }
+            if (lc($ENV{'form.Status'}) eq 'any') {
+                $Str .= '<h2>There are no students in '.$sections.'.</h2>';
+            } elsif (lc($ENV{'form.Status'}) eq 'active') {
+                $Str .= '<h2>There are no currently enrolled students '.
+                    'in '.$sections.'.</h2>';
+            } elsif (lc($ENV{'form.Status'}) eq 'expired') {
+                $Str .= '<h2>There are no previously enrolled students '.
+                    'in '.$sections.'.</h2>';
+            }
+        }
+        $Str.= '<a href="/adm/statistics?reportSelected=student_assessment">'.
+            'Return to the chart.</a>';
+        $r->print($Str);
+        $r->rflush();
+        return;
+    }
+
     # "Click" is asinine but it is probably not my place to change the world.
-    $Str .= '<h2>Click on a users name to view their chart</h2>';
+    $Str .= '<h2>Click on a students name or username to view their chart</h2>';
     $Str .= '<table border="0"><tr><td bgcolor="#777777">'."\n";
     $Str .= '<table border="0" cellpadding="3"><tr bgcolor="#e6ffff">'."\n";
     foreach my $field (@Fields) {
@@ -827,7 +903,7 @@ sub DisplayClasslist {
         #
         foreach my $field (@Fields) {
             $Str .= '<td>';
-            if ($field eq 'fullname') {
+            if ($field eq 'fullname' || $field eq 'username') {
                 $Str .= '<a href="/adm/statistics?reportSelected=';
                 $Str .= &Apache::lonnet::escape('student_assessment');
                 $Str .= '&sort='.&Apache::lonnet::escape($ENV{'form.sort'});
@@ -857,26 +933,27 @@ sub CreateMainMenu {
     #
     my $Str = '';
     #
-    $Str .= '<table border="0"><tbody><tr>'."\n";
-    $Str .= '<td align="center"><b>Report:</b></td>'."\n";
-    $Str .= '<td align="center">';
-    $Str .= '<select name="reportSelected" '.
-        'onchange="document.Statistics.submit()">'."\n";
-    foreach (sort(keys(%$reports))) {
-        $Str .= '<option value="'.$_.'"';
-        if($current eq $_) {
-            $Str .= ' selected';
-        }
-        $Str .= '>'.$reports->{$_}.'</option>'."\n";
-    }
-    $Str .= '</select></td>'."\n";
-    #
-    $Str .= '<td>'.('&nbsp;'x30).'</td>';
-    $Str .= '<td align="center">'.
-        '<input type="submit" name="ClearCache" value="Clear Caches" />'.
-            "</td>\n";
-    $Str .= '</tr></tbody></table>'."\n";
-    $Str .= '<hr>'."\n";
+    $Str  = '<input type="hidden" name="reportSelected" value="'.$current.'">';
+#    $Str .= '<table border="0"><tbody><tr>'."\n";
+#    $Str .= '<td align="center"><b>Report:</b></td>'."\n";
+#    $Str .= '<td align="center">';
+#    $Str .= '<select name="reportSelected" '.
+#        'onchange="document.Statistics.submit()">'."\n";
+#    foreach (sort(keys(%$reports))) {
+#        $Str .= '<option value="'.$_.'"';
+#        if($current eq $_) {
+#            $Str .= ' selected';
+#        }
+#        $Str .= '>'.$reports->{$_}.'</option>'."\n";
+#    }
+#    $Str .= '</select></td>'."\n";
+#    #
+#    $Str .= '<td>'.('&nbsp;'x30).'</td>';
+#    $Str .= '<td align="center">'.
+#        '<input type="submit" name="ClearCache" value="Clear Caches" />'.
+#            "</td>\n";
+#    $Str .= '</tr></tbody></table>'."\n";
+#    $Str .= '<hr>'."\n";
     #
     return $Str;
 }
@@ -987,8 +1064,6 @@ END
         &Apache::lonstudentassessment::BuildStudentAssessmentPage($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);
     }