Is there a javascript callback for the ajax action (when you change the shipping) on the woocommerce checkout? And how do you hook into that callback?
Add a checkbox on the WooCommerce checkout page. If you’re not comfortable using hooks, you can also customize your checkout page using plugins. There are many tools out there but we recommend these two: Checkout Manager for WooCommerce: With more than 70,000 active installations, this is one of the most popular checkout plugins for WooCommerce.
Add a validation function to your functions.php file. Select any field and the Advanced tab. Besides the built-in validation rules, you will also see your own rules: Number, URL, Length. Add a Website field and choose URL validation method. Go to WooCommerce checkout, enter an invalid URL in the field and place the order.
You can use these checkout hooks to edit notes, add some content before the billing fields, before order review or after the checkout form, apply some logic to increase the price or limit users by role, and much more. WooCommerce hooks work exactly like WordPress native hooks.
Where woocommerce_after_checkout_billing_form is the hook and QuadLayers_callback_function is the function we create to add our custom scripts. Filter hooks, on the other hand, work in the same way but they need to receive and return a parameter in the function. For example:
jQuery( document ).on( 'updated_checkout', function() {
console.log( 'here goes a action' );
} );
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