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The OnClientDeleting Client-side event occurs when the item or items are about to be deleted. 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_items() - returns an array of the items selected for deletion

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

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

  • get_domEvent() - returns the DOM event object

The example below shows how to delete an item after the user clicks OK in the confirmation dialog:

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

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