--- loncom/interface/lonindexer.pm	2004/07/15 14:47:31	1.120
+++ loncom/interface/lonindexer.pm	2004/08/01 19:36:33	1.122
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Directory Indexer
 #
-# $Id: lonindexer.pm,v 1.120 2004/07/15 14:47:31 matthew Exp $
+# $Id: lonindexer.pm,v 1.122 2004/08/01 19:36:33 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -662,10 +662,12 @@ sub get_list {
     if ($ENV{'form.updatedisplay'}) {
 	foreach (keys %hash) {
 	    delete $hash{$_} if ($_ =~ /^dirlist_files_/);
+	    delete $hash{$_} if ($_ =~ /^dirlist_timestamp_files_/);
 	}
     }
 
-    if ($hash{'dirlist_files_'.$luri}) {
+    if (defined($hash{'dirlist_files_'.$luri}) &&
+	$hash{'dirlist_timestamp_files_'.$luri}+600 > (time)) {
 	@list = split(/\n/,$hash{'dirlist_files_'.$luri});
     } elsif ($uri=~/\.(page|sequence)\/$/) {
 # is a page or a sequence
@@ -681,6 +683,7 @@ sub get_list {
 # is really a directory
 	@list = &Apache::lonnet::dirlist($uri);
 	$hash{'dirlist_files_'.$luri} = join("\n",@list);
+	$hash{'dirlist_timestamp_files_'.$luri} = time;
     }
     return @list=&match_ext($r,@list);
 }