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The OnClientNodeDragStart client-side event is called each time the user begins to drag a node.

The event handler receives parameters:

  1. The TreeView** instance that fired the event.

  2. 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 " +

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