Delayed AJAX requests

dojo.delayedXhr.js

define('delayable-xhr', [
  'dojo/request/xhr',
  'dojo/request/util',
  'dojo/Deferred'
], function (
  xhr,
  util,
  Deferred
) {
  'use strict';

  var delayableXhr = function(url, options) {
    var canceler = function () {
      window.clearTimeout(timeout);
      xhrPromise && xhrPromise.cancel();
    };
    var def = new Deferred(canceler);
    var xhrPromise;
    var timeout;

    if(!options || !options.delay) {
      return xhr(url, options);
    }

    timeout = window.setTimeout(function () {
      xhrPromise = xhr(url, options).then(function () {
        def.resolve.apply(this, arguments);
      }, function () {
        def.reject.apply(this, arguments);
      });
    }, options.delay);

    return def.promise;
  }
  
  // ".get", ".post", ".put" and ".del", just like regular xhr
  util.addCommonMethods(delayableXhr);
  
  return delayableXhr;

});

jquery.delayedXhr.js

(function ($) {
  'use strict';
  
  $.delayableAjax = function (options) {
    var args = arguments;
    var def = $.Deferred();
    var promise = def.promise();
    var timeout;
    var xhrPromise;

    def.abort = promise.abort = function () {
      window.clearTimeout(timeout);
      xhrPromise && xhrPromise.abort();
    };

    if(args.length !== 1) {
       return $.ajax.apply(this, args);
    }

    if(!options || !options.delay) {
      return $.ajax(options);
    }

    timeout = window.setTimeout(function () {
      xhrPromise = $.ajax(options).done(function () {
        def.resolveWith(this, arguments);
      }).fail(function () {
        def.rejectWith(this, arguments);
      });      
    }, options.delay);

    return promise;
  };

}(jQuery));