SelectionChanging プロパティ (DataTreeClientEvents)

// The client event 'SelectionChanging' takes two parameters sender and e
// sender  is the object which is raising the event
// e is the DataTreeSelectionEventArgs
function WebDataTree_SelectionChanging(sender, e) {

    //Get the newly selected tree nodes array
    var newSelectedNodes = e.getNewSelectedNodes();

    //Gets the text of the node at index 0 in the array
    var nodeText = newSelectedNodes[0].get_text();

    if (!confirm("Are you sure you want to select the node '" + nodeText + "'?"))
        //Cancels the SelectionChanging event
        e.set_cancel(true);
        
}