アクションはキャンセルできます。
WebDataTree1.ClientEvents.NodeExpanding = "WebDataTree_NodeExpanding"
WebDataTree1.ClientEvents.NodeExpanding = "WebDataTree_NodeExpanding";
// The client event 'NodeExpanding' takes two parameters sender and e // sender is the object which is raising the event // e is the DataTreeNodeEventArgs function WebDataTree_NodeExpanding(sender, e) { //Gets the node object that is expanding var node = e.getNode(); //Gets the text of the node var nodeText = node.get_text(); if (!confirm("Are you sure you want to expand the node '" + nodeText + "'?")) //Cancels the NodeExpanding event e.set_cancel(true); }