OnGroupCollapsing

Sys.CancelEventArgs OnGroupCollapsing Property

To get or set property values for client API properties, you must call property accessor methods that are named with the get_ and set_ prefixes. For example, to get or set a value for a property such as cancel, you call the get_cancel or set_cancel.

This event is fired before a group is collapsed.

Example:

<telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server">
    <ClientSettings>
        <ClientEvents OnGroupCollapsing="GroupCollapsing" />
    </ClientSettings>
</telerik:RadGrid>

function GroupCollapsing(sender, eventArgs) {
    alert("GroupCollapsing is being fired");
}