--- loncom/homework/radiobuttonresponse.pm	2004/10/04 17:41:01	1.94
+++ loncom/homework/radiobuttonresponse.pm	2005/01/10 19:21:57	1.98
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # mutliple choice style responses
 #
-# $Id: radiobuttonresponse.pm,v 1.94 2004/10/04 17:41:01 matthew Exp $
+# $Id: radiobuttonresponse.pm,v 1.98 2005/01/10 19:21:57 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -118,12 +118,17 @@ sub storesurvey {
     my $response = $ENV{'form.HWVAL_'.$Apache::inputtags::response['-1']};
     &Apache::lonxml::debug("Here I am!:$response:");
     if ( $response !~ /[0-9]+/) { return ''; }
+    my $part = $Apache::inputtags::part;
     my $id = $Apache::inputtags::response['-1'];
     my @whichfoils=@{ $Apache::response::foilgroup{'names'} };
     my %responsehash;
     $responsehash{$whichfoils[$response]}=$response;
-    $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}=&Apache::lonnet::hash2str(%responsehash);
-    $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}='SUBMITTED';
+    my $responsestr=&Apache::lonnet::hash2str(%responsehash);
+    $Apache::lonhomework::results{"resource.$part.$id.submission"}=
+	$responsestr;
+    my %previous=&Apache::response::check_for_previous($responsestr,$part,$id);
+    my $ad=$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}='SUBMITTED';
+    &Apache::response::handle_previous(\%previous,$ad);
     &Apache::lonxml::debug("submitted a $response<br />\n");
     return '';
 }
@@ -307,6 +312,9 @@ sub whichfoils {
 		&Apache::lonxml::error(&HTML::Entities::encode("No valid value assigned ($Apache::response::foilgroup{$name.'.value'}) for foil $name in <foilgroup>",'<>&"'));
 	    }
 	}
+	if (!$havetrue && $Apache::lonhomework::type ne 'survey') {
+	    &Apache::lonxml::error("There are no true statements available.<br />");
+	}
     } else {
 	my $current=0;
 	&Apache::lonhomework::showhash(%Apache::response::foilgroup);
@@ -562,6 +570,9 @@ sub start_foil {
     my $result='';
     if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') {
 	&Apache::lonxml::startredirection;
+	if ($target eq 'analyze') {
+	    &Apache::response::check_if_computed($token,$parstack,$safeeval,'value');
+	}
     } elsif ($target eq 'edit') {
 	$result=&Apache::edit::tag_start($target,$token);
 	$result.=&Apache::edit::text_arg('Name:','name',$token);
@@ -595,7 +606,10 @@ sub end_foil {
 	my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
 	if ($value ne 'unused') {
 	    my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
-	    if (!$name) { $name=$Apache::lonxml::curdepth; }
+	    if (!$name) {
+		&Apache::lonxml::error("Foils without names exist. This can cause problems to malfunction.");
+		$name=$Apache::lonxml::curdepth;
+	    }
 	    if (defined($Apache::response::foilnames{$name})) {
 		&Apache::lonxml::error(&mt("Foil name <b><tt>[_1]</tt></b> appears more than once. Foil names need to be unique.",$name));
 	    }