Club Drupal

/**

 * Add a global variable which determines if the window is being unloaded.

 *

 * This is primarily used by Drupal.displayAjaxError().

 */

Drupal.beforeUnloadCalled = false;

$(window).bind('beforeunload pagehide', function () {

    Drupal.beforeUnloadCalled = true;

});

/**

 * Displays a JavaScript error from an Ajax response when appropriate to do so.

 */

Drupal.displayAjaxError = function (message) {

  // Skip displaying the message if the user deliberately aborted (for example,

  // by reloading the page or navigating to a different page) while the Ajax

  // request was still ongoing. See, for example, the discussion at

  // http://stackoverflow.com/questions/699941/handle-ajax-error-when-a-user-clicks-refresh.

  if (!Drupal.beforeUnloadCalled) {

    alert(message);

  }

};