You need to download ajaxify-cart.liquid and upload your snippets folder then include the ajaxify-cart snippet in your theme by copy and paste the code below in your theme.liquid file right above your closing </body> tag:

{% include 'ajaxify-cart' %}

No configuration is necessary, but if you want to change a few things, go your ajaxify-cart.liquid and find Shopify.AjaxifyCart and var _config = {} you will changes your Text and Selection id or Shopify.AjaxifyCart.init() method is called, by passing to it a configuration object.

Things you can change:

Things you can change:

• addToCartBtnLabel

  Final label on add that cart button after the ajax request, so that you can add more. You could change that to 'Added to bag' for example. Default is Add to cart.

• addedToCartBtnLabel

  Label on add to cart button that shows for howLongTillBtnReturnsToNormal milliseconds after item has been added to the cart. Default is Thank you!.

• addingToCartBtnLabel

  Label on add to cart button while item is being added to the cart. Default is Adding....

• soldOutBtnLabel

  Label on add to cart button when all of the item's stock is in the cart. Default is Sold Out.

• howLongTillBtnReturnsToNormal

  Time during which the add to cart button label is addedToCartBtnLabel. Default is 2000. In milliseconds.

• cartCountSelector

  CSS selector for the element on the page that contains the cart count to update after Ajax request.

• cartTotalSelector

  CSS selector for the element on the page that contains the cart total to update after Ajax request.

• feedbackPosition

  Where to position the feedback after the Ajax request. There are 3 possible values:

  • aboveForm for top of add to cart form,
  • belowForm for below the add to cart form, and
  • nextButton for next to add to cart button.

  The default is nextButton.

The configuration object can contain any of the above.

Example, Also you use this thing like button text changes wish to use 'Added to bag' as button label when the item has been added to the cart, use the following code:

Shopify.AjaxifyCart.init({ 
  addedToCartBtnLabel: 'Added to bag' 
});