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Sorting a drop down list box

Posted on 2000-02-28
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Last Modified: 2010-04-09
How can I sort a combo box after adding items to it dynamically?
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Question by:wariar
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3 Comments
 
LVL 33

Accepted Solution

by:
knightEknight earned 50 total points
ID: 2565591
<HTML>
<HEAD>
<SCRIPT language='javascript'>
function optswap( cboListBox, i, j )
{
   if ( i == j )
   {
      return (false);
   }

   with ( cboListBox )
   {
      var opttxt = options[i].text
      var optval = options[i].value
      var optsel = options[i].selected

      options[i].text      = options[j].text;
      options[i].value   = options[j].value;
      options[i].selected   = options[j].selected;

      options[j].text      = opttxt;
      options[j].value   = optval;
      options[j].selected   = optsel;
   }

   return (true);
}


function SortListBox( cboListBox, start, end )
{
   // quick-sort algorithm for listbox widgets
   if ( start+1 < end )
   {
      var prevlow = start;

      for ( var i=start+1; i<end; ++i )
      {
         if ( cboListBox.options[i].text.toUpperCase() < cboListBox.options[start].text.toUpperCase() )
         {
            optswap( cboListBox, i, ++prevlow );
         }
      }

      optswap( cboListBox, start, prevlow );

      SortListBox( cboListBox, start, prevlow );
      SortListBox( cboListBox, prevlow+1, end );
   }
}
</script>
</head>
<BODY>
<FORM name='myform'>
<SELECT name='myselect' size='6'>
 <OPTION>Frank</option>
 <OPTION>Ralph</option>
 <OPTION>Hank</option>
 <OPTION>Fred</option>
 <OPTION>Abe</option>
 <OPTION>Gabe</option>
 <OPTION>John</option>
 <OPTION>Jim</option>
 <OPTION>ZIggy</option>
 <OPTION>Iggy</option>
</select>
<INPUT type='button' value='Sort' onClick='SortListBox( this.form.myselect, 0, this.form.myselect.options.length-1 );'>
</form>
</body>
</html>
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LVL 33

Expert Comment

by:knightEknight
ID: 2565629
OOPS!  One little typo -- in the onClick of the sort button, change the last parameter from:  options.length-1    to just:  options.length   -- that should do it.
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Author Comment

by:wariar
ID: 2565848
Thanks! It is what I was looking for.
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