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The OnClientItemExpand client-side event occurs after the user has expanded a panel item.

The event handler receives two parameters:

  1. The instance of the panel bar firing the event.

  2. An eventArgs parameter containing the following methods:

    • get_item returns a reference to the RadPanelItem that has been expanded.

    • get_domEvent() returns the DOM event object.

    function OnClientItemExpand(sender, args) {
        alert("The " + args.get_item().get_text() + " item has been expanded");
<telerik:radpanelbar id="RadPanelBar1" runat="server" onclientitemexpand="OnClientItemExpand">

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