Get the value of a custom checkout field in woocommerce 3

Question

In Woocommerce checkout, I am adding a custom checkout field and here is my code:

add_action( \'woocommerce_before_order_notes\', \'shipping_add_select_chec         


        

Answer 1

For theWC()->customer->billing_country_zone:

• First since Woocommerce 3, properties can be accessed on most all Woocommerce instances objects.
• And "billing_country_zone" is no a default property of WC_Customer instance object.

As it's about checkout fields, instead you should use $checkout argument which is the instance of the WC_Checkout Object. Then there is the appropriated method get_value() to be used on it...

What is that for?
Once the customer has submitted at least one order, the selected value for "billing_country_zone" will be displayed on checkout page.

So you will have to replace the line:

), WC()->customer->billing_country_zone );

by this one:

), $checkout->get_value('billing_country_zone') );

If $checkout variable argument is not defined, you will use WC()->checkout like:

), WC()->checkout->get_value('billing_country_zone') );

---

Now when you will save this custom checkout field value, you will need to save it:

1. As order meta data
2. And also as User meta data

So Here is the complete code (commented):

// Display custom checkout field
add_action( 'woocommerce_before_order_notes', 'display_custom_checkout_field' );
function display_custom_checkout_field( $checkout ) {
    $options = array_merge( [ '' => __( 'Nothing to select' ), ], city_zone() );
    woocommerce_form_field( 'billing_country_zone', array(
            'type'     => 'select',
            'class'    => array( 'form-row-wide', 'address-field', 'update_totals_on_change' ),
            'label'    => __( 'City zone' ),
            'required' => true,
            'options'  => $options
    ), $checkout->get_value('billing_country_zone') );
}

// custom checkout field validation
add_action( 'woocommerce_checkout_process', 'custom_checkout_field_validation' );
function custom_checkout_field_validation() {
    if ( isset( $_POST['billing_country_zone'] ) && empty( $_POST['billing_country_zone'] ) )
        wc_add_notice( __( 'Please select a "City zone".', 'woocommerce' ), 'error' );
}

// Save custom checkout field value as custom order meta data and user meta data too
add_action( 'woocommerce_checkout_create_order', 'custom_checkout_field_update_order_meta', 20, 2 );
function custom_checkout_field_update_order_meta( $order, $data ) {
    if ( isset( $_POST['billing_country_zone'] ) ) {
        // Save custom checkout field value
        $order->update_meta_data( '_billing_country_zone', esc_attr( $_POST['billing_country_zone'] ) );

        // Save the custom checkout field value as user meta data
        if( $order->get_customer_id() )
            update_user_meta( $order->get_customer_id(), 'billing_country_zone', esc_attr( $_POST['billing_country_zone'] ) );
    }
}

Code goes in function.php file of your active child theme (or active theme). tested and works.