RadComboBox for ASP.NET AJAX

The OnClientItemChecking client-side event occurs when a particular item is about to be checked. This event is fired before the particular item being checked.

The event handler receives two parameters:

1. The instance of the combobox firing the event.

2. An eventArgs parameter containing the following methods:

   • get_item returns the item that is about to be checked.

   • set_cancel lets you prevent the item from checking.

   • get_domEvent() returns the DOM event object.

This example show the item which is about to be checked:

CopyASPX

<script language="javascript" type="text/javascript">

    function OnClientItemChecking(sender, eventArgs) {

        alert("The following items is about to be checked:" + eventArgs.get_item().get_text());

    }
</script>
    <telerik:RadComboBox ID="RadComboBox1" runat="server" OnClientItemChecking="OnClientItemChecking"
    CheckBoxes="true">
    </telerik:RadComboBox>