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The OnClientNodeExpanded client-side event occurs after a parent node expands to display child nodes.

Calling the client-side expand() or set_expanded(true) method does not fire OnClientNodeExpanding and OnClientNodeExpanded client-side events. More information is available here.

The event handler receives parameters:

  1. The TreeView instance that fired the event.

  2. Event arguments with functions:

  • get_node() retrieves a reference to the clicked on node.

  • get_domEvent() retrieves a DOM event object of the node expand.

The example below displays the text for the parent node and a count of child nodes.

<telerik:RadTreeView RenderMode="Lightweight" ID="RadTreeView1" runat="server" 
function ClientNodeExpanded(sender, eventArgs) {
    var node = eventArgs.get_node();
    alert("Parent node " +
            node.get_text() +
            " is expanded to show " +
            + " child nodes");

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