Woocommerce: Run PHP function on cart update [duplicate] - php

Question

This question already has an answer here:
Display message based on cart items count in WooCommerce cart
(1 answer)
Closed 3 years ago.
I want to display a message on my WooCommerce Cart Page, that tells my customers, how much they need to purchase to get a free gift.
I already got the following code which works, but I have one problem.
When customers update their cart or the quantity the following code does not update (because the page does not reload).
<?php $e_cart = WC()->cart->cart_contents_total * 1.25;?>
<?php $e_cart_remaining = 300 - $e_cart; ?>
<?php
if ( $e_cart < 300 ) {
echo "Get a free gift, when you purchase for ${e_cart_remaining} more.";
}?>
So the problem is, that if a customers has goods for 250 in his cart the message will say: "Purchase for 50 more to get a free gift". (Because you will get a free gift at 300). But if they change the quantity of one of the products the text still says 50. (Because the page have not updated)
How do i trigger this script or block of code every time the cart is updated?
Thank you very much.

Answer 1

To display a custom message on cart page based on cart amount, use the following:
// On cart page only
add_action( 'woocommerce_check_cart_items', 'custom_total_item_quantity_message' );
function custom_total_item_quantity_message() {
$e_cart = WC()->cart->cart_contents_total * 1.25;
$e_cart_remaining = 300 - $e_cart;
if( is_cart() && $e_cart < 300 ){
wc_print_notice( sprintf( __("Get a free gift, when you purchase for %s more.", "woocommerce"), $e_cart_remaining ), 'notice' );
}
}
Code goes in function.php file of your active child theme (or active theme).