OnClientNodeDragStart
The OnClientNodeDragStart client-side event is called each time the user begins to drag a node.
The event handler receives parameters:
The TreeView** instance that fired the event.
Event arguments with functions:
get_node() retrieves a reference to the clicked on node.
set_cancel() - call this function to specify whether the event should be canceled (true) or not (false).
get_domEvent() retrieves a DOM event object of the node dragging.
get_htmlElement() retrieves the element of the dragged node.
get_sourceNodes() returns an array of all the nodes being dragged (Useful when MultipleSelect is True).
The example below demonstrates getting the current x and y coordinates of the mouse while the node is being dragged.
function ClientNodeDragStart(sender, eventArgs) {
var node = eventArgs.get_node();
if (node.get_level() == 0) {
var myDiv = document.getElementById("myDiv");
myDiv.innerHTML = "Cannot drag " +
node.get_text() +
" at level " +
node.get_level();
eventArgs.set_cancel(true);
}
}