This is an amended fragment of Microsoft jQuery Unobtrusive Ajax (http://nuget.org/packages/Microsoft.jQuery.Unobtrusive.Ajax). The change is to the error property, to ensure that it calls .apply() to invoke the function specified by the data-ajax-failure attribute. Previously it did not call .apply() hence the error handler specified by the pag…

jquery.unobtrusive-ajax.errorfix.js

$.extend(options, {
  type: element.getAttribute("data-ajax-method") || undefined,
	url: element.getAttribute("data-ajax-url") || undefined,
	beforeSend: function (xhr) {
		var result;
		asyncOnBeforeSend(xhr, method);
		result = getFunction(element.getAttribute("data-ajax-begin"), ["xhr"]).apply(this, arguments);
		if (result !== false) {
			loading.show(duration);
		}
		return result;
	},
	complete: function () {
		loading.hide(duration);
		getFunction(element.getAttribute("data-ajax-complete"), ["xhr", "status"]).apply(this, arguments);
	},
	success: function (data, status, xhr) {
		asyncOnSuccess(element, data, xhr.getResponseHeader("Content-Type") || "text/html");
		getFunction(element.getAttribute("data-ajax-success"), ["data", "status", "xhr"]).apply(this, arguments);
	},
	error: function () {
		// Ensure the error handling function is invoked using .apply()
		getFunction(element.getAttribute("data-ajax-failure"), ["xhr", "status", "error"]).apply(this, arguments);
	}
});