--- loncom/homework/optionresponse.pm	2008/12/10 21:48:21	1.157
+++ loncom/homework/optionresponse.pm	2010/02/05 21:38:41	1.161
@@ -1,7 +1,7 @@
 # LearningOnline Network with CAPA
 # option list style responses
 #
-# $Id: optionresponse.pm,v 1.157 2008/12/10 21:48:21 raeburn Exp $
+# $Id: optionresponse.pm,v 1.161 2010/02/05 21:38:41 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -190,13 +190,14 @@ sub end_foilgroup {
 
     my $TeXlayout=&Apache::lonxml::get_param('TeXlayout',$parstack,$safeeval,
 					     -2,0);
+    my $checkboxvalue=&Apache::lonxml::get_param('checkboxvalue',$parstack,$safeeval);
     if ($target eq 'tex' && $tex_option_switch eq 'nochoice') {@opt=();}
     &Apache::lonxml::debug("Options are $#opt");
     my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
     my $randomize = &Apache::lonxml::get_param('randomize',$parstack,
 					       $safeeval,'-2');
     if ($target eq 'web' || $target eq 'tex') {
-      $result.=&displayfoils($target,$max,$randomize,$TeXlayout,@opt);
+      $result.=&displayfoils($target,$max,$randomize,$TeXlayout,$checkboxvalue,@opt);
       $Apache::lonxml::post_evaluate=0;
     } elsif ( $target eq 'answer') {
       $result.=&displayanswers($max,$randomize,@opt);
@@ -359,6 +360,15 @@ sub displayanswers {
     return $result;
 }
 
+sub check_box_opt {
+    my ($target,$checkboxvalue,@opt)=@_;
+# Check if we are in checkbox mode: checkboxvalue specified, on web, only two options.
+# If so, return "checked" value
+    if ($#opt!=1) { return ''; }
+    if ($target ne 'web') { return ''; }
+    return $checkboxvalue;
+}
+
 sub check_for_invalid {
     my ($names,$options) = @_;
     my %bad_names;
@@ -381,7 +391,7 @@ sub check_for_invalid {
 }
 
 sub displayfoils {
-  my ($target,$max,$randomize,$TeXlayout,@opt)=@_;
+  my ($target,$max,$randomize,$TeXlayout,$checkboxvalue,@opt)=@_;
   if (!defined(@{ $Apache::response::foilgroup{'names'} })) {return;}
   my @names = @{ $Apache::response::foilgroup{'names'} };
   my @truelist;
@@ -427,6 +437,11 @@ sub displayfoils {
     my $temp=1;
     my %lastresponse=&Apache::lonnet::str2hash($Apache::lonhomework::history{"resource.$part.$id.submission"});
     my $internal_counter=$Apache::lonxml::counter;
+    my $checkboxopt=&check_box_opt($target,$checkboxvalue,@opt);
+    if ($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*$/) {
@@ -439,7 +454,8 @@ sub displayfoils {
       my $lastopt=$lastresponse{$name};
       my $optionlist="<option></option>\n";
 
-      if($target eq 'tex' and $env{'form.pdfFormFields'} eq 'yes') {
+      if($target eq 'tex' and $env{'form.pdfFormFields'} eq 'yes'
+         && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
           my $fieldname = $env{'request.symb'}.'&part_'.$Apache::inputtags::part.'&optionresponse'.'&HWVAL_'.$Apache::inputtags::response['-1'].':'.$temp;
           $optionlist =  &Apache::lonxml::print_pdf_start_combobox($fieldname);
       }
@@ -447,13 +463,15 @@ sub displayfoils {
       foreach my $option (@opt) {
 	  my $escopt=&HTML::Entities::encode($option,'\'"&<>');
           if ($option eq $lastopt) {
-              if ($target eq 'tex' && $env{'form.pdfFormFields'} eq 'yes') {
+              if ($target eq 'tex' && $env{'form.pdfFormFields'} eq 'yes'
+                  && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
                   $optionlist .= &Apache::lonxml::print_pdf_add_combobox_option($option);
               } else {
                   $optionlist.="<option value='".$escopt."' selected=\"selected\">$option</option>\n";
               }
           } else {
-              if ($target eq 'tex' && $env{'form.pdfFormFields'} eq 'yes') {
+              if ($target eq 'tex' && $env{'form.pdfFormFields'} eq 'yes'
+                  && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
                   $optionlist .= &Apache::lonxml::print_pdf_add_combobox_option($option);
               } else {
                   $optionlist.="<option value='".$escopt."'>$option</option>\n";
@@ -462,10 +480,34 @@ sub displayfoils {
       }
       if ($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>';
 	  }
@@ -516,9 +558,9 @@ sub displayfoils {
 		  '\end{enumerate} \vskip -8 mm \strut ';
 	      $internal_counter++;
 	  }
-          if ($target eq 'tex' && $env{'form.pdfFormFields'} eq 'yes') {
-              $text =~ s/.*indent(.*)$/$1/;
-              $text = $1;
+          if ($target eq 'tex' && $env{'form.pdfFormFields'} eq 'yes'
+              && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
+              $text =~ s/\\item//m;
               $result .= " $optionlist ". &Apache::lonxml::print_pdf_end_combobox($text).'\strut \\\\';
               $temp++;
           }