--- loncom/interface/lonnavdisplay.pm	2025/02/26 19:50:21	1.46
+++ loncom/interface/lonnavdisplay.pm	2025/05/26 19:55:09	1.47
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Navigate Maps Display Handler
 #
-# $Id: lonnavdisplay.pm,v 1.46 2025/02/26 19:50:21 raeburn Exp $
+# $Id: lonnavdisplay.pm,v 1.47 2025/05/26 19:55:09 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -40,6 +40,7 @@ use Apache::lonlocal;
 use Apache::londocs();
 use Apache::lonuserstate;
 use LONCAPA::ltiutils;
+use LONCAPA;
 
 sub handler {
     my $r = shift;
@@ -348,11 +349,57 @@ ENDCLOSE
     # If no resources were printed, print a reassuring message so the
     # user knows there was no error.
     if ($renderArgs->{'counter'} == 0) {
+        my $noresmsg;
         if ($showOnlyHomework) {
-            $r->print("<p><span class=\"LC_info\">".&mt("All homework is currently completed.")."</span></p>");
+            $noresmsg = &mt('All homework is currently completed.');
         } else { # both jumpToFirstHomework and normal use the same: course must be empty
-            $r->print("<p><span class=\"LC_info\">".&mt("This course is empty.")."</span></p>");
+            $noresmsg = &mt('This course is empty.');
+            if (($renderArgs->{'deeplinknolist'}) &&
+                ($env{'request.course.deeponlyprot'})) {
+                my ($linkprot,$currmatch,$othermatches,@names);
+                if ($env{'request.linkprot'}) {
+                    ($linkprot) = split(/:/,$env{'request.linkprot'});
+                }
+                foreach my $launcher (split(/&/,$env{'request.course.deeponlyprot'})) {
+                    my ($name,$itemnums) = split(/:/,$launcher);
+                    my @nums = split(/,/,$itemnums);
+                    if (($linkprot) &&
+                        (grep(/^\Q$linkprot\E$/,@nums))) {
+                        $currmatch = &LONCAPA::unescape($name);
+                        if (@nums > 1) {
+                            $othermatches = 1;
+                        }
+                    } else {
+                        push(@names,&LONCAPA::unescape($name));
+                    }
+                }
+                if ($linkprot) {
+                    if ($currmatch) {
+                        $noresmsg = &mt('No main content available when accessed using the link you followed from [_1].',
+                                        $currmatch);
+                        if ($othermatches) {
+                            $noresmsg = '<br />'.
+                                        &mt('Main content may be available by following a different link from [_1].',
+                                            $currmatch);
+                        }
+                    } else {
+                        $noresmsg = &mt('No main content available using the link you followed.');
+                    }
+                } elsif (@names > 0) {
+                    $noresmsg = &mt('No main content available from direct login to this course.');
+                }
+                if (@names == 1) {
+                    $noresmsg .= '<br />'.
+                                 &mt('Main content is likely available by following links from [_1]',
+                                     $names[0]);
+                } elsif (@names > 1) {
+                    $noresmsg .= '<br />'.
+                                 &mt('Main content is likely available by following links from the following: [_1]',
+                                     join(', ',@names));
+                }
+            }
         }
+        $r->print('<p><span class="LC_info">'.$noresmsg.'</span></p>');
     }
     &endContentScreen($r);
     $r->print(&Apache::loncommon::end_page());