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The OnClientTransferring client-side event occurs when the selected item is about to be transferred to the destination RadListBox. This event can be cancelled.

The event handler receives two parameters:

  1. The instance of the listbox firing the event

  2. An event arguments parameter containing the following methods:

  • get_item() - returns the item that is about to be transferred.

  • get_items() - returns an array of items that are about to be transferred

  • get_sourceListBox() - returns the instance of the source RadListBox which the item currently belongs to

  • get_destinationListBox() - returns the instance of the destination RadListBox where the item is transferring to.

  • set_cancel() - lets you cancel the event and prevent items from being selected.

  • get_domEvent() - returns the DOM event object

The example below shows how to ask the user before transferring the item:

function onClientTransferringHandler(sender, e) {
    if (!confirm("Are you sure?")) {

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