--- loncom/homework/optionresponse.pm	2009/05/04 13:42:50	1.158
+++ loncom/homework/optionresponse.pm	2010/02/05 20:54:33	1.160
@@ -1,7 +1,7 @@
 # LearningOnline Network with CAPA
 # option list style responses
 #
-# $Id: optionresponse.pm,v 1.158 2009/05/04 13:42:50 onken Exp $
+# $Id: optionresponse.pm,v 1.160 2010/02/05 20:54:33 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -359,6 +359,11 @@ sub displayanswers {
     return $result;
 }
 
+sub check_box_opt {
+# Check if we are in checkbox mode. If so, return "checked" value
+    return '';
+}
+
 sub check_for_invalid {
     my ($names,$options) = @_;
     my %bad_names;
@@ -427,6 +432,11 @@ sub displayfoils {
     my $temp=1;
     my %lastresponse=&Apache::lonnet::str2hash($Apache::lonhomework::history{"resource.$part.$id.submission"});
     my $internal_counter=$Apache::lonxml::counter;
+    my $checkboxopt=&check_box_opt();
+    if ($checkboxopt) {
+       $result.='<br />'.&mt('Choices: ').'<b>'.$opt[0].','.$opt[1].'</b>. '.
+                &mt('Select all that are <b>[_1]</b>.',$checkboxopt);
+    }
     foreach $name (@whichopt) {
       my $text=$Apache::response::foilgroup{$name.'.text'};
       if ($text!~/^\s*$/) {
@@ -465,10 +475,34 @@ sub displayfoils {
       }
       if ($target ne 'tex') {
 	  if ($Apache::lonhomework::type ne 'exam') {
-	      $optionlist='<select onchange="javascript:setSubmittedPart(\''.
+# we are on the web, this is not an exam, and the problem can be answered
+              if ($checkboxopt) {
+# generate checkboxes
+                  my $fieldname=$Apache::inputtags::response['-1'].':'.$temp;
+                  my $altopt=$opt[0];
+                  if ($opt[0] eq $checkboxopt) {
+                     $altopt=$opt[1];
+                  }
+                  my $defopt=$lastopt;
+                  unless ($defopt) { $defopt=$altopt; }
+                  my $escdefopt=&HTML::Entities::encode($defopt,'\'"&<>');
+                  my $esccheckboxopt=&HTML::Entities::encode($checkboxopt,'\'"&<>');
+                  my $escaltopt=&HTML::Entities::encode($altopt,'\'"&<>');
+# checkboxopt is how the box is labelled
+# altopt is the alternative option
+# lastopt is what the user submitted before
+# defopt is what the field is going to start out with: either previous choice or altopt
+# fieldname is this input field's name after HWVAL_
+                  $optionlist='<input type="hidden" name="HWVAL_'.$fieldname.'" value="'.$escdefopt.'" />'.
+                  '<input type="checkbox" name="HWCHK_'.$fieldname.'" onclick="javascript:if (this.form.elements[\'HWCHK_'.
+                  $fieldname.'\'].checked) { this.form.elements[\'HWVAL_'.$fieldname.'\'].value=\''.$esccheckboxopt.'\'; } else { this.form.elements[\'HWVAL_'.$fieldname.'\'].value=\''.$escaltopt.'\'; };setSubmittedPart(\''.$part.'\');"'.($defopt eq $checkboxopt?' checked="checked"':'')." />\n";
+              } else {
+# classic selection list
+	          $optionlist='<select onchange="javascript:setSubmittedPart(\''.
 		  $part.'\');" name="HWVAL_'.
 		  $Apache::inputtags::response['-1'].':'.$temp.'">'.
 		  $optionlist."</select>\n";
+              }
 	  } else {
 	      $optionlist='<u>'.('&nbsp;'x10).'</u>';
 	  }