WooCommerce - Inject JS Code in Footer

function add_custom_js_to_footer() {
?>
    <script type="text/javascript">
        jQuery(document).ready(function($){
            document.addEventListener('dndmfu_completed', function(event){
                var totalFile = event.detail.total;
                if( totalFile > 0 ){
                    jQuery('input[name="quantity"]').val( totalFile );
                }
            });
        });
    </script>
<?php
}
add_action('wp_footer', 'add_custom_js_to_footer');