Cart Delivery Fee

cart_delivery_fee.php

<?php
add_action('wp_ajax_myCartDeliveryFee', 'myCartDeliveryFee');
add_action('wp_ajax_nopriv_myCartDeliveryFee', 'myCartDeliveryFee');

function myCartDeliveryFee() {
    $fee = isset($_POST['delivery_fee']) && !empty($_POST['delivery_fee']) ? filter_input(INPUT_POST, 'delivery_fee') : 0;
    session_start();
    $_SESSION['cart_fee_val'] = floatval(str_replace('$', '', $fee));
}

add_action('woocommerce_cart_calculate_fees', 'woo_add_cart_fee');

function woo_add_cart_fee() {
    session_start();
    $extracost = $_SESSION['cart_fee_val'];
    WC()->cart->add_fee('Deivery Fee', $extracost);
}
?>

<script>
function setDeliveryFee(fee) {
    $.ajax({
        type: "POST",
        url: $('html').data('admin'),
        data: 'action=myCartDeliveryFee&delivery_fee=' + fee,
        success: function (resp) {
            $('.cart_form [name="update_cart"]:eq(0)').removeAttr('disabled').click();
        }
    });
}
</script>