Removing JQuery's dependency from the preloading image with promises code described here : http://www.bennadel.com/blog/2597-preloading-images-in-angularjs-with-promises.htm

vanilla-preloader

loadImageLocation: function loadImageLocation(imageLocation) {

            var preloader = this;


            var _onLoadHandler = function(event) {

                // Since the load event is asynchronous, we have to
                // tell AngularJS that something changed.
                $rootScope.$apply(
                    function() {

                        preloader.handleImageLoad(event.target.src);

                        // Clean up object reference to help with the
                        // garbage collection in the closure.
                        preloader = image = event = null;

                    }
                );
                this.onload = null;
                this.onerror = null;
            };
            var _onErrorHandler = function(event) {
                // Since the load event is asynchronous, we have to
                // tell AngularJS that something changed.
                $rootScope.$apply(
                    function() {

                        preloader.handleImageError(event.target.src);

                        // Clean up object reference to help with the
                        // garbage collection in the closure.
                        preloader = image = event = null;

                    }
                );
                this.onload = null;
                this.onerror = null;

            };
            // When it comes to creating the image object, it is critical that
            // we bind the event handlers BEFORE we actually set the image
            // source. Failure to do so will prevent the events from proper
            // triggering in some browsers.
            var image = new Image();

            //Attach the loading event to the _onLoadHandler function
            image.onload = _onLoadHandler;

            //Attach the error event to the _onErrorHandler function
            image.onerror = _onErrorHandler;

            image.src = imageLocation;

        }