Woocommerce update cart with ajax and timeout

woocommerce-update-cart-ajax

/*
 * Original author  Rodolfo Melogli
 * https://businessbloomer.com/woocommerce-automatically-update-cart-quantity-change/
 * Timeout Fork     Martí Fenosa
 * https://martifenosa.com/
 */

add_action( 'wp_footer', 'cart_update' ); 
function cart_update() { 
	if (is_cart()) { ?> 
    		<script type="text/javascript"> 
      			var timeout;
			jQuery('div.woocommerce').on('click', 'input.qty', function(){ 
				if(timeout != undefined){
				  clearTimeout(timeout);
				}
				timeout = setTimeout(function() {
				  jQuery("[name='update_cart']").trigger("click"); 
				}, 500);
			}); 
		</script> 
		<?php 
	} 
}