The OnClientItemsRequesting client-side event occurs when EnableLoadOnDemand is True and the listbox is about to send a server-side request to load more items. This event fires before the items are added to the listbox' Items collection.

The event handler receives two parameters:

  1. The instance of the listbox firing the event.

  2. An eventArgs parameter containing the following methods:

  • get_context returns a context object (implements IDictionary) that is passed to the server-side code that handles the request for items.

  • set_cancel lets you prevent the items request.

This event can be used to cancel the load-on-demand request.

<script type="text/javascript">
    var shouldCancelEvent = true;
    function OnClientItemsRequesting(sender, eventArgs) {

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