Woocommerce update quantities in cart

woocommerce_update_quantities_in_cart.js

$('body').on('change keyup input', '.quantity_mini input', function () {
		var qtyMiniWrapper = $(this).closest('.quantity_mini'),
			qtyMiniUpdateBtn = qtyMiniWrapper.find('button.update'),
			defaultQty = parseFloat(qtyMiniUpdateBtn.attr('data-default_qty')),
			selectedQty = parseFloat($(this).val());
		
		if( defaultQty !== selectedQty ) {
			qtyMiniUpdateBtn.fadeIn('350');
		} else {
			qtyMiniUpdateBtn.fadeOut('350');
		}
		
	})
	
	$('body').on('click', '.quantity_mini button.update', function () {
		var thisEl = $(this).closest('.quantity_mini').find('input.qty'),
				cartItemKey = thisEl.attr('name'),
				cartItemQty = thisEl.val(),
				thisBtn = $(this);
		
		jQuery.ajax({
			url: mz_obj.ajax_url,
			type: 'post',
			data: {
				action: 'mz_cart_item_change_qty',
				cart_item_key: cartItemKey,
				quantity: cartItemQty,
			},
			beforeSend: function() {
				$('.cart_loader').fadeIn();
			},
			success: function (response) {
				$('.cart_loader').fadeOut();
				//$( document.body ).trigger( 'wc_fragment_refresh' );
				
				if( response.success ) {
					
					thisBtn.fadeOut('350').attr('data-default_qty', parseFloat(cartItemQty));
					
					if(response.data.price != undefined ) {
						thisEl.closest('.woocommerce-mini-cart-item').find('.price').html(response.data.price);
					}
					
					if(response.data.total != undefined ) {
						$('.checkout.wc-forward').html(response.data.total);
						$('.cart_total').html(response.data.total_price);
					}
					
					if ($('body').hasClass('woocommerce-checkout')) {
						$(document.body).trigger('update_checkout');
					}
				}
				
			},
			error: function (errorThrown) {
				console.log(errorThrown);
			}
		});
		
	});

woocommerce_update_quantities_in_cart.php

/*
 * add filter to 'woocommerce_cart_item_quantity' filter.
 * To add custom "update" btn per cart item
 * Priority: 99
 *
 */
add_filter( 'woocommerce_cart_item_quantity', 'mz_woocommerce_cart_item_quantity', 99, 3);
function mz_woocommerce_cart_item_quantity( $product_quantity, $cart_item_key, $cart_item ) {
	
	$default_qty = $cart_item['quantity'];
	$add_html = '<button type="button" data-default_qty="'.$default_qty.'" class="update">'. __('עדכן', 'cs') .'</button>';
	
	return $product_quantity . $add_html;
}

/** AJAX PHP Action **/

add_action( 'wp_ajax_mz_cart_item_change_qty', 'mz_cart_item_change_qty' );
add_action( 'wp_ajax_nopriv_mz_cart_item_change_qty', 'mz_cart_item_change_qty' );
function mz_cart_item_change_qty() {
	
	
	$key = isset($_POST['cart_item_key']) && !empty($_POST['cart_item_key']) ? sanitize_text_field($_POST['cart_item_key']) : false;
	$quantity = isset($_POST['quantity']) && !empty($_POST['quantity']) ? sanitize_text_field($_POST['quantity']) : false;
	
	if( $key && $quantity ) {
		WC()->cart->set_quantity($key, $quantity);
		$cart_item = WC()->cart->get_cart_item($key);
		$_product = $cart_item['data'];
		$data['price'] = WC()->cart->get_product_subtotal( $_product, $cart_item['quantity'] );
		$data['total'] = __('לתשלום', 'cs') . wc_price(WC()->cart->get_cart_contents_total());
		$data['total_price'] = wc_price(WC()->cart->get_cart_contents_total());
	}
	
	wp_send_json_success( $data );
	
	wp_die();
	
}