Ajax.Responders.register

Ajax.Responders.register({
onCreate: function() {
  new Effect.Appear('ajax_loader', { duration: 0.3, to: 0.5 });
  },
onComplete: function(request, transport, json) {
  if (0 == Ajax.activeRequestCount) {
    new Effect.Fade('ajax_loader', { duration: 0.3, from: 0.5 });
  }
  if(!request.success()) {
    var errorMapping = $H({
      400: ['Bad Request', 'The request contains bad syntax or cannot be fulfilled.'],
      401: ['Authorization Required', 'You need to authenticate to access this page.'],
      403: ['Forbidden', 'The request was a legal request, but the server is refusing to respond to it.'],
      404: ['Page Not Found', 'The requested resource could not be found.'],
      405: ['Method Not Allowed', 'A request was made of a resource using a request method not supported by that resource; for example, using GET on a form which requires data to be presented via POST, or using PUT on a read-only resource.'],
      406: ['Not Acceptable', 'The action you tried to perform on this resource was considered unacceptable.'],
      415: ['Unsupported Media Type', 'The media type you are requesting is unsupported.'],
      422: ['Unprocessable Entity', 'The request was well-formed but was unable to be followed due to semantic errors.'],
      500: ['Application Error', 'An error occurred in the application code. Report sent.'],
      503: ['Service not available', 'The webserver did not respond to the request.'],
      505: ['HTTP Version Not Supported', 'The requested version is not available on this server.']
    });

    var errorMessage = errorMapping.get(transport.status) || ['Unknown Error', 'An error occurred, but could not be determined correctly.'];

    if (transport.responseJSON && transport.responseJSON.error)
       errorMessage = [transport.responseJSON.error.title, transport.responseJSON.error.message]

    var notifyUser = new GrowlNotifier({
      title: errorMessage[0],
      message: errorMessage[1],
      image: "/images/elements/growl_warning.png",
      type: 'error'
    });
  }
}
});

The Window.Growl Script.aculo.us mod is a modified version of Daniel Mota's Window.Growl adapted for the Script.aculo.us framework.

Growl.Smoke({
  title: "Growl.Smoke Script.aculo.us mod",
  text: "http://blog.var.cc/static/growl/",
  image: "image/var-logo-60.png",
  duration: 2.0
});

http://blog.var.cc/static/growl/
http://pastie.org/818221