In Cartface we have used Ajax framework to create a rich user experience by developing the shopping cart section using this technology. The attractive user interface, easy-to-understand flow and fast performance has made the section stand out among the popular shopping sites.
The data-ajax-handler and data-ajax-update gives the user the freedom to make any changes, like increasing the quantity of product in the cart page without going back and then proceeding forth again and still you can see it reflected in the final price along with other details.
Ajax framework makes the process of sending request to server simple and thus update the page asynchronously. If you want you can improve the user experience by making changes in the code. However, before proceeding, please note that, this is a highly sensitive code and without professional knowledge you are suggested not to make any change.