how calculate automatically the price of some woocommerce selected products - function

Question

Im trying to get the total price depend by selected products.
ex.
3 products images (woocommerce classic layout)
clicking for ex.on 2 products I get the sum of the price in a box below which then takes me to the cart.
But I don't know how to solve this problem (in html I get nothing), here's the function and the script.
function calculate_total_price() {
// ID array of the selected products from the page
$selected_products = $_POST['selected_products'];
// Initialize the total price to 0
$total = 0;
// foreach selected product ID
foreach ($selected_products as $product_id) {
// get the product ID
$product = wc_get_product($product_id);
// Add the total price
$total += $product->get_price();
}
// Return the total price
return $total;
}
jQuery(document).ready(function($) {
// click and calculate
$('#calculate-total-button').click(function(e) {
e.preventDefault();
// ID array of the selected products
var selected_products = [];
$('.selected-product').each(function() {
selected_products.push($(this).data('product-id'));
});
// send this ajax request to the function
$.ajax({
url: '/wp-admin/admin-ajax.php',
type: 'POST',
data: {
action: 'calculate_total_price',
selected_products: selected_products
},
success: function(total) {
// Display the total price on the page
$('#total-price').text(total);
}
});
});
});
Many thanks