[Update cart without button] #woo

update-cart.html

<!-- Update woocommerce cart after quantity change without clicking the button -->

<style>
.woocommerce button[name="update_cart"],
.woocommerce input[name="update_cart"] {
	display: none;
}
</style>

<script>
var timeout;

jQuery( function( $ ) {
	$('.woocommerce').on('change', 'input.qty', function(){

		if ( timeout !== undefined ) {
			clearTimeout( timeout );
		}

		timeout = setTimeout(function() {
			$("[name='update_cart']").trigger("click");
		}, 1000 ); // 1 second delay, half a second (500) seems comfortable too

	});
} );
</script>