promise.delay.usage.js

function ajax(url, settings) {
  var promise;

  // actual call
  promise = $.ajax(url, settings).promise();

  // delay magic
  promise = $.when(promise, $('<div/>').appendTo('body').fadeOut(3000)).pipe(function(value){return value[0];});

  // here you can set generic handlers for success, fail and always
  // e.g.
  //   promise.always(function(){
  //     console.log('AJAX call completed.');
  //   });
  // see http://api.jquery.com/category/deferred-object/ for more info.

  return promise;
}

// example AJAX call
ajax('/example/', { foo: 3, bar: 14 })
  .then(function(o){
    console.log(o.result+ '!');
  })
  .fail(function(){
    console.log(':(');
  });