added_to_cart.php

add_action('wp_footer','custom_jquery_add_to_cart_script');
function custom_jquery_add_to_cart_script(){
        ?>
            <script type="text/javascript">
                // Ready state
                (function($){ 

                    $( document.body ).on( 'added_to_cart', function(){
                        console.log('EVENT: added_to_cart');
                    });

                })(jQuery); 
            </script>
        <?php
}