How to Ajaxify Header Cart Items Count in WooCommerce?

Ajaxify Header Cart Items Count in WooCommerce

Challenge

In a custom WooCommerce-integrated WordPress theme, an issue arose where a cart items count indicator displayed incorrect values after adding items. The culprit was adding a specific quantity of items to the cart, resulting in the indicator only incrementing by one.

Solution

To address this, we can leverage WooCommerce's dedicated woocommerce_add_to_cart_fragments action hook, which provides Ajax support for updating the cart items count.

Implementation

1. HTML and ID/Class

In the theme's header.php file, we define the HTML element that will display the cart count. It's important to assign a unique ID or class for easy targeting:

<code class="html"><div id="mini-cart-count"><?php echo WC()->cart->get_cart_contents_count(); ?></div></code>

2. PHP Code

Next, we add a function to the functions.php file that uses the hook to update the cart count content dynamically:

<code class="php">add_filter( 'woocommerce_add_to_cart_fragments', 'wc_refresh_mini_cart_count');
function wc_refresh_mini_cart_count($fragments){
    ob_start();
    $items_count = WC()->cart->get_cart_contents_count();
    ?>
    <div id="mini-cart-count"><?php echo $items_count ? $items_count : ' '; ?></div>
    <?php
        $fragments['#mini-cart-count'] = ob_get_clean();
    return $fragments;
}</code>

3. Ajax Update

If you require additional control with jQuery, consider using the wc_fragment_refresh or wc_fragments_refreshed events:

<code class="javascript">$(document.body).trigger('wc_fragment_refresh');</code>

or

<code class="javascript">$(document.body).trigger('wc_fragments_refreshed');</code>

By implementing these changes, the cart items count indicator will accurately reflect the number of items in the cart, even when adding specific quantities of products.

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