ShowEmotionsHelper.js

({
    getGiphyImage : function( emotion, callback ) {
        var xhr = new XMLHttpRequest();
        xhr.open( "GET", "https://api.giphy.com/v1/gifs/search?api_key=B9pfrx9wtMXmdLnVaJ6vllAW7uTqaHvO&q=" + emotion + "&limit=1", false )
        xhr.onreadystatechange = function() {
            if( this.readyState === 4 ) {
                var jsonResp = JSON.parse( this.response );
                
                var gifUrl = jsonResp.data[0].images.downsized.url;
                
                callback( gifUrl );
            }
        };
        xhr.send();
    }
})