The OnClientDropDownOpening client-side event occurs before the drop-down list opens.
The event handler receives two parameters:
- The instance of the combobox firing the event.
- An eventArgs parameter containing the following methods:
- set_cancel lets you prevent the drop-down from opening.
- get_domEvent() returns the DOM event object of the drop-down opening.
The example below shows how to prevent the drop-down list from opening when there are no items to be displayed:
| [ASP.NET] OnClientDropDownOpening |
 Copy Code |
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<script language="javascript" type="text/javascript">
function OnClientDropDownOpening(sender, eventArgs)
{
if(sender.get_items().get_count() == 0)
eventArgs.set_cancel(true);
}
</script>
<telerik:RadComboBox
ID="RadComboBox1"
runat="server"
OnClientDropDownOpening="OnClientDropDownOpening">
</telerik:RadComboBox>
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See Also