--- loncom/interface/lonstatistics.pm	2003/10/23 15:12:45	1.88
+++ loncom/interface/lonstatistics.pm	2003/12/24 21:54:58	1.92
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonstatistics.pm,v 1.88 2003/10/23 15:12:45 matthew Exp $
+# $Id: lonstatistics.pm,v 1.92 2003/12/24 21:54:58 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -48,6 +48,7 @@ Main handler for statistics and chart.
     use Apache::loncoursedata;
     use Apache::lonhtmlcommon;
     use Apache::lonproblemanalysis;
+    use Apache::lonsubmissiontimeanalysis;
     use Apache::lonproblemstatistics;
     use Apache::lonstudentassessment;
     use Apache::lonpercentage;
@@ -79,6 +80,7 @@ use Apache::loncommon;
 use Apache::loncoursedata;
 use Apache::lonhtmlcommon;
 use Apache::lonproblemanalysis();
+use Apache::lonsubmissiontimeanalysis();
 use Apache::lonproblemstatistics();
 use Apache::lonstudentassessment();
 use Apache::lonpercentage;
@@ -1048,6 +1050,11 @@ sub CreateMainMenu {
                      short_description => 
     &mt('Detailed statistics and graphs of student performance on problems.'),
                  },
+                   { internal_name => 'submissiontime_analysis',
+                     name => &mt('Submission Time Analysis'),
+                     short_description => 
+    &mt('Display and analysis of submission times on assessments.'),
+                 },
 #                   { internal_name => 'student_assessment',
 #                     name => &mt('Problem Status Chart'),
 #                     short_description => 
@@ -1098,21 +1105,11 @@ sub handler {
         }
     }
     #
-    # Set document type for header only
-    if($r->header_only) {
-        if ($ENV{'browser.mathml'}) {
-            $r->content_type('text/xml');
-        } else {
-            $r->content_type('text/html');
-        }
-        &Apache::loncommon::no_cache($r);
-        $r->send_http_header;
-        return OK;
-    }
-    #
     # Send the header
-    $r->content_type('text/html');
+    &Apache::loncommon::no_cache($r);
+    &Apache::loncommon::content_type($r,'text/html');
     $r->send_http_header;
+    if ($r->header_only) { return OK; }
     #
     # Extract form elements from query string
     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
@@ -1151,16 +1148,16 @@ sub handler {
             &Apache::loncoursedata::delete_caches($ENV{'requres.course.id'});
         }
         #
-        # Set up the statistics and chart environment
-        &PrepareClasslist();
-        &PrepareCourseData($r);
-        #
         # Begin form output
         $r->print('<form name="Statistics" ');
         $r->print('method="post" action="/adm/statistics">');
         $r->rflush();
         #
         my $GoToPage = $ENV{'form.reportSelected'};
+        #
+        # Set up the statistics and chart environment
+        &PrepareCourseData($r);
+        #
         $r->print('<input type="hidden" name="reportSelected" value="'.
                   $GoToPage.'">');
         if($GoToPage eq 'activitylog') {
@@ -1169,6 +1166,8 @@ sub handler {
             &Apache::lonproblemstatistics::BuildProblemStatisticsPage($r,$c);
         } elsif($GoToPage eq 'problem_analysis') {
             &Apache::lonproblemanalysis::BuildProblemAnalysisPage($r,$c);
+        } elsif($GoToPage eq 'submissiontime_analysis') {
+            &Apache::lonsubmissiontimeanalysis::BuildSubmissionTimePage($r,$c);
         } elsif($GoToPage eq 'student_assessment') {
             &Apache::lonstudentassessment::BuildStudentAssessmentPage($r,$c);
         } elsif($GoToPage eq 'DoDiffGraph' || $GoToPage eq 'PercentWrongGraph') {