jQuery("#product-addtocart-button").on('click', function() {
        var canvas = jQuery('canvas.canvas');
        var canvasImage = canvas[0].toDataURL("image/jpeg", 0.7);

        jQuery.ajax({
          type: "POST",
          dataType: 'json',
          url: UPLOADER_URL,
          data: {
             imgBase64: canvasImage
          }
        }).done(function(response) {
            last_option.val(response.filename);
            console.log("Generated filename", response.filename);
             // TRIGGER ADD TO CART FUNCTION HERE
             // BUT THE ADD TO CART IS BEING TRIGGERED EVEN IF THE AJAX IS NOT YET FINISH
        });

    });