Maximum Checked Items

[Nick]

Hi, I was wondering how you set the maximum number of selections a user can make when the ComboBox is set to checkboxes="True" ? 

Thanks in advance.

[Princy]

Hello,

Try the following javascript.
JS:

<script type="text/javascript">
 function OnClientItemChecking(sender, args)
  {
    if (sender.get_checkedItems().length == 5)
   {
     alert("count exceeded");
     args.set_cancel(true);
   }
 }
</script>

Thanks,
Princy.

[Ivana]

Hi Nick,

There is no built-in functionality, which controls the number of checked items, in the RadComboBox. This, however, could be easily implemented using the client-side API of the control.
Here is an example showing how it could be achieved:

function clientItemChecking(sender, args)
{
    var checkedItems = sender.get_checkedItems().length;
    if (checkedItems >= 2 && (args.get_item().get_checked() == false))
    {
        args.set_cancel(true);
    }
}

<telerik:RadComboBox runat="server" ID="RadComboBox1" CheckBoxes="true" OnClientItemChecking="clientItemChecking">
    <Items>
        <telerik:RadComboBoxItem Text="Berlin" Value="Berlin" />
        <telerik:RadComboBoxItem Text="Paris" Value="Paris" />
        <telerik:RadComboBoxItem Text="Rome" Value="Rome" />
        <telerik:RadComboBoxItem Text="London" Value="London" />
    </Items>
</telerik:RadComboBox>

I hope this helps.

Kind regards,
Ivana
the Telerik team