Want to allow users to select quantity and add products to their WooCommerce cart without refreshing the page? Use AJAX and a little PHP to make it seamless.

How to Add AJAX Cart with Quantity in WooCommerce

Step 1: Create a JS File

Start by making a JavaScript file named custom-ajax-add-to-cart.js inside your theme or plugin folder. Paste this code inside:

(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('success 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);

Step 2: Load the Script in functions.php

Add this function in your functions.php:

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

Step 3: Add Quantity in Loop Template

Insert quantity input fields in your product loop:

<?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" min="1" step="1">
      </div>
      <button type="submit" class="button">Add to Cart</button>
    </form>
  </div>

<?php endwhile; ?>

Step 4: Save and Verify

Test your new setup on the WooCommerce shop page. Items should add to the cart dynamically.

Tips

Ensure the AJAX setting is enabled under WooCommerce → Settings → Products → General. Template changes may require adjustments.