FIX: Removing Non-Visible Items from an HTML SELECT Box Causes General Protection Fault (GPF) (239657)

MORE INFORMATION

This is a generic example of the code used in such an instance:

<FORM NAME="myform">
<SELECT NAME="widget" SIZE="3" MULTIPLE>
<OPTION>111111</OPTION>
<OPTION>222222</OPTION>
<OPTION>333333</OPTION>
<OPTION>444444</OPTION>
<OPTION>555555</OPTION>
<OPTION>666666</OPTION>
<OPTION>777777</OPTION>
<OPTION>888888</OPTION>
<OPTION>999999</OPTION>
</SELECT>
<INPUT TYPE="BUTTON" VALUE="Crash or not" ONCLICK="RemoveSelectedItems()">
</FORM>
				

Here is the script code to remove the selected items that causes GPF.

<SCRIPT LANGUAGE="JavaScript">

   function RemoveSelectedItems()
   {
      var i

      for ( i = document.myform.widget.options.length - 1; i >= 0; --i )
      {
         if (  document.myform.widget.options[ i ].selected )
         {
           document.myform.widget.options[ i ] = null
         }
      }
   }

</SCRIPT>
				

To reproduce the problem, you need to select at least four items in this sample and then click the "Crash or not" button.

The root of the problem is removing the selected items. The workaround is to deselect the items, and save the list of selections in a temporary array.

The following is an example of how this might be coded:

<SCRIPT LANGUAGE="JavaScript">

   function RemoveSelectedItems()
   {
      var i, cnt
      var mywidget
      var selArray = new Array()

      myWidget= document.myform.widget

      for ( i = myWidget.options.length - 1; i >= 0; --i )
      {
         if (  myWidget.options[ i ].selected )
         {
            myWidget.options[i].selected = false
            selArray[selArray.length]=i
            //document.myform.widget.options[ i ]=null
         }
      }

      for ( i =  0 ; i <= selArray.length; i++ )
      {
         myWidget.options[ selArray[i] ]=null
      }
   }

</SCRIPT>