update-cart-item-ajax.js

(function($){
  $(document).ready(function(){
    $('.prefix-cart-notes').on('change keyup paste',function(){
      $('.cart_totals').block({
        message: null,
        overlayCSS: {
          background: '#fff',
          opacity: 0.6
       }
      });
     var cart_id = $(this).data('cart-id');
     $.ajax(
        {
          type: 'POST',
          url: prefix_vars.ajaxurl,
          data: {
            action: 'prefix_update_cart_notes',
            security: $('#woocommerce-cart-nonce').val(),
            notes: $('#cart_notes_' + cart_id).val(),
            cart_id: cart_id
          },
          success: function( response ) {
            $('.cart_totals').unblock();
          }
        }
      )
    });
  });
})(jQuery);

This event is not firing after we hit the update cart. when the cart page is loaded initially, everything works fine, but when we change the quantity of the item and hit the Update Cart button, the cart is updated. after that, the text changes are not saved.