--- loncom/interface/lonnavmaps.pm	2018/01/31 14:05:12	1.541
+++ loncom/interface/lonnavmaps.pm	2018/04/14 17:52:43	1.542
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Navigate Maps Handler
 #
-# $Id: lonnavmaps.pm,v 1.541 2018/01/31 14:05:12 raeburn Exp $
+# $Id: lonnavmaps.pm,v 1.542 2018/04/14 17:52:43 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -3481,6 +3481,71 @@ sub usedVersion {
     return $self->navhash("version_$linkurl");
 }
 
+sub isFirstResource {
+    my $self = shift;
+    my $map = shift;
+    my $symb = shift;
+    return unless (ref($map));
+    my $isfirst;
+    my $firstResource = $map->map_start();
+    if (ref($firstResource)) {
+        if ((!$firstResource->is_map()) && ($firstResource->src() ne ''))  {
+            if ($firstResource->symb() eq $symb) {
+                $isfirst = 1;
+            } else {
+                $isfirst = 0;
+            }
+        } else {
+            my $it = $self->getIterator($firstResource,undef,undef,1);
+            while ( my $res=$it->next()) {
+                if ((ref($res)) && ($res->src() ne '') && (!$res->is_map())) {
+                    if ($res->symb() eq $symb) {
+                        $isfirst = 1;
+                    } else {
+                        $isfirst = 0;
+                    }
+                    last;
+                }
+            }
+        }
+    }
+    return $isfirst;
+}
+
+sub isLastResource {
+    my $self = shift;
+    my $map = shift;
+    my $symb = shift;
+    return unless (ref($map));
+    my $islast;
+    my $lastResource = $map->map_finish();
+    if (ref($lastResource)) {
+        if ((!$lastResource->is_map()) && ($lastResource->src() ne ''))  {
+            if ($lastResource->symb() eq $symb) {
+                $islast = 1;
+            } else {
+                $islast = 0;
+            }
+        } else {
+            my $currRes = $self->getBySymb($symb);
+            if (ref($currRes)) {
+                my $it = $self->getIterator($currRes,undef,undef,1);
+                while ( my $res=$it->next()) {
+                    if ((ref($res)) && ($res->src() ne '') && (!$res->is_map())) {
+                        if ($res->symb() eq $symb) {
+                            $islast = 1;
+                        } else {
+                            $islast = 0;
+                        }
+                        last;
+                    }
+                }
+            }
+        }
+    }
+    return $islast;
+}
+
 1;
 
 package Apache::lonnavmaps::iterator;