--- loncom/interface/lonnavdisplay.pm	2014/05/22 12:25:32	1.22.4.5
+++ loncom/interface/lonnavdisplay.pm	2019/02/03 22:19:06	1.22.4.9
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Navigate Maps Display Handler
 #
-# $Id: lonnavdisplay.pm,v 1.22.4.5 2014/05/22 12:25:32 raeburn Exp $
+# $Id: lonnavdisplay.pm,v 1.22.4.9 2019/02/03 22:19:06 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -38,7 +38,7 @@ use Apache::lonhtmlcommon();
 use Apache::lonnet;
 use Apache::lonlocal;
 use Apache::londocs();
-#use Time::HiRes qw( gettimeofday tv_interval );
+use Apache::lonuserstate;
 
 sub handler {
     my $r = shift;
@@ -47,14 +47,9 @@ sub handler {
 
 sub real_handler {
     my $r = shift;
-    #my $t0=[&gettimeofday()];
     # Handle header-only request
     if ($r->header_only) {
-        if ($env{'browser.mathml'}) {
-            &Apache::loncommon::content_type($r,'text/xml');
-        } else {
-            &Apache::loncommon::content_type($r,'text/html');
-        }
+        &Apache::loncommon::content_type($r,'text/html');
         $r->send_http_header;
         return OK;
     }
@@ -67,50 +62,85 @@ sub real_handler {
         return REDIRECT;
     }
 
-    # Send header, don't cache this page
-    if ($env{'browser.mathml'}) {
-        &Apache::loncommon::content_type($r,'text/xml');
-    } else {
+# ------------------------------------------------------------ Get query string
+    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['sort',
+                                                                  'showOnlyHomework',
+                                                                  'postsymb','register']);
+    # Check if course needs to be re-initialized
+    my $loncaparev = $r->dir_config('lonVersion');
+    my ($result,@reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
+    my %prog_state=();
+    my $closure;
+
+    if ($result eq 'switch') {
+        &Apache::loncommon::content_type($r,'text/html');
+        $r->send_http_header;
+        $r->print(&Apache::loncommon::check_release_result(@reinit));
+        return OK;
+    } elsif ($result eq 'update') {
+        my $cid = $env{'request.course.id'};
+        my $cnum = $env{'course.'.$cid.'.num'};
+        my $cdom = $env{'course.'.$cid.'.domain'};
         &Apache::loncommon::content_type($r,'text/html');
+        $r->send_http_header;
+        &startpage($r);
+        my $preamble = '<div id="LC_update_'.$cid.'" class="LC_info">'.
+                       '<br />'.
+                       &mt('Your course session is being updated because of recent changes by course personnel.').
+                       ' '.&mt('Please be patient.').'<br /></div>'.
+                       '<div style="padding:0;clear:both;margin:0;border:0"></div>';
+        $closure = <<ENDCLOSE;
+<script type="text/javascript">
+// <![CDATA[
+\$("#LC_update_$cid").hide('slow');
+// ]]>
+</script>
+ENDCLOSE
+        %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
+        &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
+        $r->rflush();
+        my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum",\%prog_state,$r);
+        &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished'));
+        if ($ferr) {
+            &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+            $r->print($closure.&Apache::loncommon::end_page());
+            my $requrl = $r->uri;
+            $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
+            $env{'user.reinit'} = 1;
+            return HTTP_NOT_ACCEPTABLE;
+        }
     }
-    &Apache::loncommon::no_cache($r);
-
-    my %toplinkitems=();
 
     # Create the nav map
     my $navmap = Apache::lonnavmaps::navmap->new();
 
     if (!defined($navmap)) {
+        if ($result eq 'update') {
+            &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+            $r->print($closure.&Apache::loncommon::end_page());
+        }
         my $requrl = $r->uri;
         $env{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
         $env{'user.reinit'} = 1;
         return HTTP_NOT_ACCEPTABLE;
     }
-    $r->send_http_header;
 
-# ------------------------------------------------------------ Get query string
-    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['sort','showOnlyHomework','postsymb','register']);
-    
-# ----------------------------------------------------- Force menu registration
-    # Header
-    my $course_type = &Apache::loncommon::course_type();
-    my $title = $course_type . ' Contents';
-    my ($start_page,$args);
-    if ($env{'form.register'}) {
-        $args = {'force_register' => $env{'form.register'}};
-        $start_page = &Apache::loncommon::start_page($title,undef,$args);
+    if ($result eq 'update') {
+        $r->rflush();
+        &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+        $r->print($closure);
+        $r->rflush();
     } else {
-        my $brcrum = [{href => '/adm/navmaps',
-                       text => &mt($course_type . ' Contents'),
-                       no_mt => 1},
-                     ];
-        $args = {'bread_crumbs' => $brcrum};
-        $start_page = &Apache::loncommon::start_page($title,undef,$args);
+        # Send header, don't cache this page
+        &Apache::loncommon::content_type($r,'text/html');
+        $r->send_http_header;
+        &startpage($r);
     }
-    $r->print($start_page.
-              '<script type="text/javascript">window.focus();</script>');
+
     &startContentScreen($r,'navmaps');
-    $r->rflush();
+    unless ($result eq 'update') {
+        $r->rflush();
+    }
 
     # Check that it's defined
     if (!($navmap->courseMapDefined())) {
@@ -121,6 +151,7 @@ sub real_handler {
         return OK;
     }
 
+    my %toplinkitems=();
     my @resources = $navmap->retrieveResources();
     my $sequenceCount = 0;
     my $problemCount = 0;
@@ -197,7 +228,7 @@ sub real_handler {
                      ."</span>");
         }
     } else {
-        my $link = 'navmaps?jumpToFirstHomework';
+        my $link = '/adm/navmaps?jumpToFirstHomework';
         if ($env{'form.register'}) {
             $link .= '&amp;register='.$env{'form.register'}; 
         }
@@ -220,7 +251,7 @@ sub real_handler {
         $filterFunc = sub { my $res = shift; 
                             return $res->completable() || $res->is_map();
                         };
-        my $link = 'navmaps?sort='.$env{'form.sort'};
+        my $link = '/adm/navmaps?sort='.$env{'form.sort'};
         if ($env{'form.register'}) {
             $link .= '&amp;register='.$env{'form.register'};
         }
@@ -232,7 +263,7 @@ sub real_handler {
         $env{'form.condition'} = 1;
 	$resource_no_folder_link = 1;
     } else {
-        my $link = 'navmaps?sort='.$env{'form.sort'}.'&amp;showOnlyHomework=1';
+        my $link = '/adm/navmaps?sort='.$env{'form.sort'}.'&amp;showOnlyHomework=1';
         if ($env{'form.register'}) {
             $link .= '&amp;register='.$env{'form.register'};
         }
@@ -287,8 +318,6 @@ sub real_handler {
             $r->print("<p><span class=\"LC_info\">".&mt("This course is empty.")."</span></p>");
         }
     }
-    #my $td=&tv_interval($t0);
-    #$r->print("<br />$td");
     &endContentScreen($r);
     $r->print(&Apache::loncommon::end_page());
     $r->rflush();
@@ -296,6 +325,33 @@ sub real_handler {
     return OK;
 }
 
+sub startpage {
+    my ($r) = @_;
+# ----------------------------------------------------- Force menu registration
+    # Header
+    my $course_type = &Apache::loncommon::course_type();
+    my $title = $course_type . ' Contents';
+    my ($start_page,$args);
+    if ($env{'form.register'}) {
+        $args = {'force_register' => $env{'form.register'}};
+        $start_page = &Apache::loncommon::start_page($title,undef,$args);
+    } else {
+        my $brcrum = [{href => '/adm/navmaps',
+                       text => &mt($course_type . ' Contents'),
+                       no_mt => 1},
+                     ];
+        $args = {'bread_crumbs' => $brcrum};
+        $start_page = &Apache::loncommon::start_page($title,undef,$args);
+    }
+    $r->print($start_page.
+              '<script type="text/javascript">'."\n".
+              '// <![CDATA['."\n".
+              'window.focus();'."\n".
+              '// ]]>'."\n".
+              '</script>');
+    return;
+}
+
 sub startContentScreen {
     my ($r,$mode)=@_;