NodeEditingEntering プロパティ

// The client event 'NodeEditingEntering' takes two parameters sender and e
// sender  is the object which is raising the event
// e is the DataTreeNodeEventArgs
function WebDataTree_NodeEditingEntering(sender, e) {
    //Gets the node object that is entering edit mode
    var node = e.getNode();

    //Gets the text of the node
    var nodeText = node.get_text();

    if (!confirm("Are you sure you want to enter edit mode on the node '" + nodeText + "'?"))
        //Stops the node from entering into edit mode      
        e.set_cancel(true);
      
}