Update cart when modifying the item quantity

This code snippet will allow you to update the cart by only updating the quantities, without needing to click “Update Cart”.

<?php 

add_action('wp_head', function(){
    
    $css_code = <<<CSS
    <style>
    .woocommerce-notices-wrapper div.woocommerce-message[role=alert] {
        display: none;
    }
    
    .woocommerce button[name="update_cart"] {
        display: none !important;
    }
    </style>
CSS;
    $js_code = <<<JS
        <script type="text/javascript">
        jQuery(document).ready(function(){
            var wpcbScrollToNotices;
        
            jQuery(document).ajaxComplete(function (e) {
                jQuery.scroll_to_notices = wpcbScrollToNotices;
            });
            
            jQuery('.woocommerce').on('change', 'input.qty', function(){
            
                wpcbScrollToNotices = jQuery.scroll_to_notices;
                jQuery.scroll_to_notices = function( scrollElement ) {
                    return false;
            	};
            	
            	setTimeout(function(){
            	    jQuery('button[name="update_cart"]').trigger('click');    
            	}, 200);
                
            
            });
        });
        </script>
JS;
    echo $css_code;
    echo $js_code;
});