WooCommerce: Update shipping costs on checkout using ajax

woocommerce_update_shipping_costs.php

<script type="text/javascript">
  /* in order to update info on your checkout page you need to trigger update_checkout function
     so add this in your javascript file for your theme or plugin
  */
  
  jQuery('body').trigger('update_checkout');
  
  /* what this does is update the order review table but what it doesn't do is update shipping costs;
     the calculate_shipping function of your shipping class will not be called again;
     so if you were like me and you made a shipping method plugin and you had to change costs based on payment method then
     this is the only way to ensure it does just that
  */
</script>

<?php
# add this in your plugin file and that's it, the calculate_shipping method of your shipping plugin class will be called again
function action_woocommerce_checkout_update_order_review($array, $int)
{
    WC()->cart->calculate_shipping();
    return;
}
add_action('woocommerce_checkout_update_order_review', 'action_woocommerce_checkout_update_order_review', 10, 2);
?>

not working for me :(

That doesn't work anymore, use add_filter( 'woocommerce_package_rates', 'change_rates', 10, 2 ); instead. Where "change rates" is a function.

Example:
<script type="text/javascript">jQuery('body').trigger('update_checkout');</script>
and

add_filter( 'woocommerce_package_rates', 'change_rates', 10, 2 );
function change_rates( $rates, $packages ) {
  foreach ( $rates as $rate ) {
            $rate->label = "Delivery";
            $rate->cost = 40;
   }
 return $rates
}

Below code will update Shipping costs immediately when Postcode value changes.

$('#billing_postcode').on('input', function() { $('body').trigger('update_checkout', { update_shipping_method: true }); });

That doesn't work anymore, use add_filter( 'woocommerce_package_rates', 'change_rates', 10, 2 ); instead. Where "change rates" is a function.

Example:
<script type="text/javascript">jQuery('body').trigger('update_checkout');</script>
and

add_filter( 'woocommerce_package_rates', 'change_rates', 10, 2 );
function change_rates( $rates, $packages ) {
  foreach ( $rates as $rate ) {
            $rate->label = "Delivery";
            $rate->cost = 40;
   }
 return $rates
}

If I instead wish to invoke my custom shipping method to recalculate shipping costs, how do I do that please?

Thanks! This code jQuery('body').trigger('update_checkout'); saved me the time of research 😃

That is not working. In source woocommerce mention to this docs
https://gist.github.com/woogists/271654709e1d27648546e83253c1a813

Put this code to functions.php to solve this

function wc_shipping_rate_cache_invalidation( $packages ) {
	foreach ( $packages as &$package ) {
		$package['rate_cache'] = wp_rand();
	}

	return $packages;
}
add_filter( 'woocommerce_cart_shipping_packages', 'wc_shipping_rate_cache_invalidation', 100 );

Thanks @PhongGCS, it really works.