Add class to img if image is portrait or landscape

orientable.js

// html: <img ng-src="image-url.jpg" class="horizontal" orientable />
app.directive('orientable', function () {       
    return {
        link: function(scope, element, attrs) {   
            element.bind("load" , function(e){ 
                // success, "onload" catched
                // now we can do specific stuff:
                if(this.naturalHeight > this.naturalWidth){
                    this.className = "vertical";
                }
            });
        }
    }
});