check items in order

[Alan]

Hi,

How can I have a combobox which us allow to check items only in order. ie it should not allow to check 2nd item if 1st is not checked.

Thanks

[Shinu]

Hi Alan,

Try the following Javascript to achieve your scenario.

JS:

<script type="text/javascript">
   function OnClientItemChecking(sender, args)
    {
      var index = args.get_item().get_index();
      if (index != 0)
      {
        if (!sender.get_items().getItem(index).get_checked())
        {
          if (!sender.get_items().getItem(index - 1).get_checked())
          {
           args.set_cancel(true);
          }
        }
        else
        {
         for (var i = index + 1; i < sender.get_items().get_count(); i++)
          {
           sender.get_items().getItem(i).set_checked(false);
          }
        }
      }
    }
</script>

Thanks,
Shinu.