Update Cart Automatically

/**

 * Update Cart Automatically on Quantity Change

 *

 * @author Misha Rudrastyh

 * @url https://rudrastyh.com/woocommerce/remove-update-cart-button.html

 */

add_action( 'wp_head', function() {

	?><style>

	.woocommerce button[name="update_cart"],

	.woocommerce input[name="update_cart"] {

		display: none !important;

	}</style><?php

} );

add_action( 'wp_footer', function() {

	?><script>

	jQuery( function( $ ) {

		let timeout;

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

			if ( timeout !== undefined ) {

				clearTimeout( timeout );

			}

			timeout = setTimeout(function() {

				$("[name='update_cart']").trigger("click"); // trigger cart update

			}, 1000 ); // 1 second delay, half a second (500) seems comfortable too

		});

	} );

	</script><?php

} );