イベントをキャンセルすると、自動ポストバックを無効にし、クリックしたノードの NavigationUrl への移動を無効にします。
WebDataTree1.ClientEvents.NodeClick = "WebDataTree_NodeClick"
WebDataTree1.ClientEvents.NodeClick = "WebDataTree_NodeClick";
// The client event 'NodeClick' takes two parameters sender and e // sender is the object which is raising the event // e is the DataTreeNodeEventArgs function WebDataTree_NodeClick(sender, e) { //Gets the node object that is clicked var node = e.getNode(); //Gets the text of the node var nodeText = node.get_text(); alert("Node '" + nodeText + "' is clicked!"); }