Woocommerce hook on address field change [closed]

There is a similar question on StackOverflow, check the answer there. Hope this will help you.

Here is the code you can use:

add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' );

function custom_override_checkout_fields( $fields ) {

    $fields['shipping']['custom_field'] = array(
        'label' => 'Custom field',
        'required' => 1,
        'class' => array ('address-field', 'update_totals_on_change' )
    );

    return $fields;
}

Basically what is important here is the class 'update_totals_on_change'. From here Woocommerce will handle everything by its functionality.