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The OnClientNodeEditing client-side event is called when editing is completed and before the OnClientNodeEdit event fires. This event can be canceled.

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 node being edited. You can call get_text() from this node reference to get the "old" text prior to editing.

  • get_newText() returns the new text entered by the user.

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

  • set_cancel() - call this function to specify whether the event should be canceled (true) or not (false).

The example below demonstrates preventing non-numeric entry to a node.

<telerik:RadTreeView RenderMode="Lightweight" ID="RadTreeView1" 

function ClientNodeEditing(sender, eventArgs) {
    var node = eventArgs.get_node();
    var oldText = node.get_text();
    var newText = eventArgs.get_newText()

    if (!IsNumeric(newText)) {
        alert("New entry must be numeric.");

function IsNumeric(text) {
    var ValidChars = "0123456789.";
    var IsNumber = true;
    var Char;
    for (i = 0; i < text.length && IsNumber == true; i++) {
        Char = text.charAt(i);
        if (ValidChars.indexOf(Char) == -1) {
            IsNumber = false;
    return IsNumber;

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