How to Dynamically Update WooCommerce Header Cart Items Count Using AJAX?

Ajaxify Header Cart Items Count in WooCommerce

Identifying the Need

In WooCommerce integrated WordPress themes, updating the header cart items count without reloading the page is a common challenge. jQuery offers a solution, but questions arise when items can be added in multiple quantities.

Utilizing AJAX to Retrieve Total Count

To dynamically retrieve the total cart count from PHP sessions using jQuery, a reloadCart.php file is created to echo the value:

<code class="php"><?php require('../../../wp-blog-header.php');
global $woocommerce;
echo $woocommerce->cart->get_cart_contents_count();
?></code>

AJAX Implementation

However, attempts to make AJAX calls to this file using jQuery's get(), post(), or ajax() functions have been unsuccessful.

Improved Approach

Instead of relying on a reload, WooCommerce offers a dedicated woocommerce_add_to_cart_fragments action hook that supports Ajax.

HTML Integration

Embed the cart count in the header with a unique ID or class:

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

PHP Code

Implement the following code in the theme's function.php file or a plugin:

<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;
}

Replace #mini-cart-count with .mini-cart-count if using a class.

jQuery Refresh

If additional jQuery refresh is required:

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

or

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

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