The OnClientItemsRequestFailed client-side event occurs when an error has occurred while loading elements using the load-on-demand mechanism.

The event handler receives two parameters:

  1. The instance of the listbox firing the event.

  2. An eventArgs parameter containing the following methods:

  • get_errorMessage returns the error message.

  • set_cancel lets you prevent the default error message from displaying.

You can use this event to display the default error message, or to cancel the event, in order to display a custom error message.

<script type="text/javascript">
    function OnClientItemsRequestFailed(sender, eventArgs) {

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