OnClientDropDownClosing
The OnClientDropDownClosing client-side event occurs before the drop-down list closes.
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 closing.
get_domEvent() returns the DOM event object of the drop-down closing.
The following example uses the OnClientDropDownClosing event to prevent the drop-down list from closing if the prompt item is selected:
<script language="javascript" type="text/javascript">
function OnClientDropDownClosing(sender, eventArgs) {
if (sender.get_text() == "Select An Item") {
eventArgs.set_cancel(true);
}
else {
eventArgs.set_cancel(false);
}
}
</script>
<telerik:radcombobox
id="RadComboBox1"
runat="server"
onclientdropdownclosing="OnClientDropDownClosing">
<Items>
<telerik:RadComboBoxItem runat="server" Text="Select An Item">
</telerik:RadComboBoxItem>
<telerik:RadComboBoxItem runat="server" Text="Item1">
</telerik:RadComboBoxItem>
<telerik:RadComboBoxItem runat="server" Text="Item 2">
</telerik:RadComboBoxItem>
<telerik:RadComboBoxItem runat="server" Text="Item 3">
</telerik:RadComboBoxItem>
</Items>
</telerik:radcombobox>