--- loncom/homework/response.pm	2007/03/15 02:52:16	1.160
+++ loncom/homework/response.pm	2007/04/18 00:19:37	1.163
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # various response type definitons response definition
 #
-# $Id: response.pm,v 1.160 2007/03/15 02:52:16 albertel Exp $
+# $Id: response.pm,v 1.163 2007/04/18 00:19:37 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -447,6 +447,9 @@ sub end_customresponse {
 	$result .= &Apache::response::answer_part('customresponse',$answer);
 	$result .= &Apache::response::answer_footer('customresponse');
     }
+    if ($target eq 'web') {
+	&setup_prior_tries_hash(\&format_prior_response_math);
+    }
     if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || 
 	$target eq 'tex' || $target eq 'analyze') {
 	&Apache::lonxml::increment_counter(&Apache::response::repetition());
@@ -459,6 +462,11 @@ sub end_customresponse {
     return $result;
 }
 
+sub format_prior_response_custom {
+    my ($mode,$answer) =@_;
+    return '<span class="LC_prior_custom">'.
+	    &HTML::Entities::encode($answer,'"<>&').'</span>';
+}
 
 sub start_mathresponse {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
@@ -536,6 +544,10 @@ sub end_mathresponse {
 	    }
 	}
     }
+    if ($target eq 'web') {
+	&setup_prior_tries_hash(\&format_prior_response_math);
+    }
+
     pop(@Apache::lonxml::namespace);
     pop(@Apache::response::custom_answer);
     pop(@Apache::response::custom_answer_type);
@@ -544,6 +556,12 @@ sub end_mathresponse {
     return $result;
 }
 
+sub format_prior_response_math {
+    my ($mode,$answer) =@_;
+    return '<span class="LC_prior_math">'.
+	    &HTML::Entities::encode($answer,'"<>&').'</span>';
+}
+
 sub implicit_multiplication {
     my ($expression)=@_;
 # Escape scientific notation, so 3e8 does not become 3*e*8
@@ -697,7 +715,7 @@ sub setup_params {
     if ($env{'request.state'} eq 'construct') { return; }
     my %paramlist=();
     foreach my $key (keys(%Apache::lonnet::packagetab)) {
-	if ($key =~ /^$tag/) {
+	if ($key =~ /^\Q$tag\E/) {
 	    my ($package,$name) = split(/&/,$key);
 	    $paramlist{$name}=1;
 	}
@@ -1095,6 +1113,33 @@ sub check_status {
     return 2;
 }
 
+sub setup_prior_tries_hash {
+    my ($func,$data) = @_;
+    my $part = $Apache::inputtags::part;
+    my $id   = $Apache::inputtags::response[-1];	
+    foreach my $i (1..$Apache::lonhomework::history{'version'}) {
+	my $sub_key   = "$i:resource.$part.$id.submission";
+	next if (!exists($Apache::lonhomework::history{$sub_key}));
+	my @other_data;
+	foreach my $datum (@{ $data }) {
+	    if (ref($datum)) {
+		push(@other_data,$datum);
+	    } else {
+		my $info_key = "$i:resource.$part.$id.$datum";
+		push(@other_data,$Apache::lonhomework::history{$info_key});
+	    }
+	}
+
+	my $output =
+	    &$func('grade',
+		   $Apache::lonhomework::history{$sub_key},
+		   \@other_data);
+	if (defined($output)) {
+	    $Apache::inputtags::submission_display{$sub_key} = $output;
+	}
+    }
+}
+
 1;
 __END__