Improve your WooCommerce UX by allowing customers to select quantity and add products using AJAX without a full page refresh. Here’s how to set it up.

AJAX Add to Cart with Quantity – Quick Setup Guide

1. JavaScript for AJAX Cart

Create custom-ajax-add-to-cart.js in your theme or plugin directory. Use this:

(function ($) {
  function handleAjaxAddToCart() {
    $(document).on('submit', 'form.cart', function (e) {
      e.preventDefault();

      var $form = $(this);
      var quantity = $form.find('input[name="quantity"]').val();
      var data = $form.serialize();

      $.ajax({
        type: 'POST',
        url: wc_add_to_cart_params.ajax_url,
        data: data + '&add-to-cart=' + $form.data('product_id'),
        beforeSend: function () {
          $form.removeClass('added-to-cart').addClass('loading');
        },
        complete: function () {
          $form.removeClass('loading');
        },
        success: function (response) {
          if (response && response.fragments) {
            $.each(response.fragments, function (key, value) {
              $(key).replaceWith(value);
            });
          }
        },
      });
    });
  }

  $(document).ready(function () {
    handleAjaxAddToCart();
  });
})(jQuery);

2. Register Script in Theme

Include the file using this code in functions.php:

function register_ajax_cart_script() {
  if (is_shop()) {
    wp_enqueue_script('ajax-cart-script', get_stylesheet_directory_uri() . '/custom-ajax-add-to-cart.js', array('jquery'), '1.0', true);
  }
}
add_action('wp_enqueue_scripts', 'register_ajax_cart_script');

3. Product Loop Update

Edit your shop page template to insert quantity fields:

<?php while (have_posts()) : the_post(); $product = wc_get_product(get_the_ID()); ?>

  <div <?php wc_product_class('product-item'); ?>>
    <form class="cart" data-product_id="<?php echo esc_attr(get_the_ID()); ?>">
      <div class="quantity">
        <input type="number" name="quantity" value="1" class="input-text qty text" step="1" min="1">
      </div>
      <button type="submit" class="button">Add to Cart</button>
    </form>
  </div>

<?php endwhile; ?>

4. Testing Time

Reload your WooCommerce shop, pick a quantity, and click “Add to Cart.” The item will be added without reloading the page.

Useful Note

Enable archive AJAX cart buttons via WooCommerce → Settings → Products. If you’re using a heavily customized theme, you may need to tweak templates.