Attach a function to be executed whenever an AJAX request fails. The XMLHttpRequest and settings used for that request are passed as arguments to the callback. A third argument, an exception object, is passed if an exception occured while processing the request. The function to execute. Show a message when an AJAX request fails. $("#msg").ajaxError(function(request, settings){ $(this).append("<li>Error requesting page " + settings.url + "</li>"); });