--- rat/lonpageflip.pm	2017/06/26 01:57:11	1.96
+++ rat/lonpageflip.pm	2017/11/16 13:42:01	1.97
@@ -2,7 +2,7 @@
 #
 # Page flip handler
 #
-# $Id: lonpageflip.pm,v 1.96 2017/06/26 01:57:11 raeburn Exp $
+# $Id: lonpageflip.pm,v 1.97 2017/11/16 13:42:01 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -299,6 +299,28 @@ sub check_http_req {
     return $usehttp;
 }
 
+sub reinited_js {
+    my ($url,$cid,$timeout) = @_;
+    if (!$timeout) {
+        $timeout = 0;
+    }
+    return <<"END";
+<script type="text/javascript">
+// <![CDATA[
+setTimeout(function() {
+    var newurl = '$url';
+    if (document.getElementById('LC_update_$cid')) {
+        document.getElementById('LC_update_$cid').style.display = 'none';
+    }
+    if ((newurl !== null) && (newurl !== '') && (newurl !== 'undefined')) {
+        window.location.href = "$url";
+    }
+}, $timeout);
+// ]]>
+</script>
+END
+}
+
 # ================================================================ Main Handler
 
 sub handler {
@@ -315,6 +337,7 @@ sub handler {
   my %cachehash=(); 
   my $multichoice=0;
   my %multichoicehash=();
+  my %prog_state=();
   my ($redirecturl,$redirectsymb,$enc,$anchor);
   my $next='';
   my $hostname = $r->hostname();
@@ -372,8 +395,20 @@ sub handler {
                       untie(%hash);
                   }
               }
+              &Apache::loncommon::content_type($r,'text/html');
+              $r->send_http_header;
+              $r->print(&Apache::loncommon::start_page('Content Changed'));
+              my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" 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>';
+              %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
+              &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
               my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
+              &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished'));
               if ($ferr) {
+                  &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
                   my $requrl = $r->uri;
                   $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
                   $env{'user.reinit'} = 1;
@@ -396,9 +431,16 @@ sub handler {
           } else {
               $furl=&Apache::lonnet::absolute_url().$furl;
           }
-	  &Apache::loncommon::content_type($r,'text/html');
-	  $r->header_out(Location => $furl);
-	  return REDIRECT;
+          if ($reinitcheck eq 'update') {
+              &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+              $r->print(&reinited_js($furl,$env{'request.course.id'},100));
+              $r->print(&Apache::loncommon::end_page());
+              return OK;
+          } else {
+	      &Apache::loncommon::content_type($r,'text/html');
+	      $r->header_out(Location => $furl);
+	      return REDIRECT;
+          }
       }
       if ($direction eq 'return') { 
 # -------------------------------------------------------- Return to last known
@@ -427,9 +469,15 @@ sub handler {
          } else {
              $newloc=&Apache::lonnet::absolute_url().$newloc
          }
-	 &Apache::loncommon::content_type($r,'text/html');
-	 $r->header_out(Location => $newloc);
-	 return REDIRECT;
+         if ($reinitcheck eq 'update') {
+             $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
+             $r->print(&Apache::loncommon::end_page());
+             return OK;
+         } else {
+	     &Apache::loncommon::content_type($r,'text/html');
+	     $r->header_out(Location => $newloc);
+	     return REDIRECT;
+         }
       }
 #
 # Is the current URL on the map? If not, start with last known URL
@@ -447,11 +495,18 @@ sub handler {
          if ($last) {
 	     $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
 	 } else {
-	     &Apache::loncommon::content_type($r,'text/html');
-	     $r->header_out(Location => 
-			    &Apache::lonnet::absolute_url().
-			    '/adm/navmaps');
-	     return REDIRECT;
+             my $newloc = &Apache::lonnet::absolute_url().
+                          '/adm/navmaps'; 
+             if ($reinitcheck eq 'update') {
+                 &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+                 $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
+                 $r->print(&Apache::loncommon::end_page());
+                 return OK;
+             } else {
+	         &Apache::loncommon::content_type($r,'text/html');
+	         $r->header_out(Location => $newloc); 
+	         return REDIRECT;
+             }
          }
       }
 # ------------------------------------------- Do we have any idea where we are?
@@ -548,9 +603,16 @@ sub handler {
                           $url .= $anchor;
                       }
                   }
-                  &Apache::loncommon::content_type($r,'text/html');
-                  $r->header_out(Location => $url);
-                  return REDIRECT;
+                  if ($reinitcheck eq 'update') {
+                      &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+                      $r->print(&reinited_js($url,$env{'request.course.id'},100)); 
+                      $r->print(&Apache::loncommon::end_page());
+                      return OK;
+                  } else {
+                      &Apache::loncommon::content_type($r,'text/html');
+                      $r->header_out(Location => $url);
+                      return REDIRECT;
+                  }
 	      } else {
 # --------------------------------------------------------- There was a problem
                   &Apache::loncommon::content_type($r,'text/html');
@@ -653,12 +715,23 @@ ENDSTART
 	      }
 	  } else {
 # ------------------------------------------------- Problem, could not tie hash
+              if ($reinitcheck eq 'update') {
+                  &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+                  $r->print(&Apache::loncommon::end_page());
+              } 
               $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
               return HTTP_NOT_ACCEPTABLE; 
           }
       } else {
 # ---------------------------------------- No, could not determine where we are
-	  $r->internal_redirect('/adm/ambiguous');
+          my $newloc = '/adm/ambiguous';
+          if ($reinitcheck eq 'update') {
+              &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+              $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
+              $r->print(&Apache::loncommon::end_page());
+          } else {
+	      $r->internal_redirect($newloc);
+          }
           return OK;
       }
   } else {