Action can be canceled.
WebDataTree1.ClientEvents.NodeCollapsing = "WebDataTree_NodeCollapsing"
WebDataTree1.ClientEvents.NodeCollapsing = "WebDataTree_NodeCollapsing";
// The client event 'NodeCollapsing' takes two parameters sender and e // sender is the object which is raising the event // e is the DataTreeNodeEventArgs function WebDataTree_NodeCollapsing (sender ,e) { //Gets the node object that is collapsing var node = e.getNode(); //Gets the text of the node var nodeText = node.get_text(); if (!confirm("Are you sure you want to collapse the node '" + nodeText + "'?")) //Cancels the NodeCollapsing event e.set_cancel(true); }
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2