How to run a javascript event on shopify cart update?

@deron 

To run a JavaScript event on a Shopify cart update, you can use the Shopify AJAX API to detect when the cart has been updated and then trigger your JavaScript event accordingly.

Here's a basic example of how you can achieve this:

1. Create a JavaScript function that you want to run when the cart is updated. For example:

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function onCartUpdate() {
  // Your JavaScript event code here
  console.log("Cart updated!");
}

1. Use the Shopify AJAX Cart API to listen for the cart update event. You can do this by adding an event listener to the 'ajaxCart' object. For example:

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document.addEventListener('DOMContentLoaded', function() {
  // Set up event listener for when the cart is updated
  document.addEventListener('ajaxCart.afterCartLoad', function(event) {
    // Call your function when the cart is updated
    onCartUpdate();
  });
});

1. Place this code in the theme.liquid file or in a separate JavaScript file that is included in your Shopify theme.

Once you have added this code to your theme, your JavaScript event will run every time the cart is updated on your Shopify store. You can customize the 'onCartUpdate' function to perform any actions you want when the cart is updated, such as displaying a confirmation message or updating a counter.