Can't set the default value of some fields in checkout page - wordpress

Question

I want to put user's previous data at the checkout page fields by default in my website which based on woocommerce. I cant set value for first name, last name and phone fields, although I can set value for other fields. How can I solve this problem?

Answer 1

Looking at the WC_Checkout class (/includes/class-wc-checkout.php), it contains a get_value method that is responsible for the default methods in the form.
This method has a filter woocommerce_checkout_get_value that you can use to override the default value that is loaded for each field.
Here's an example that overrides both the first name (both billing and shipping) and the last name:
add_filter('woocommerce_checkout_get_value', function( $value, $input ) {
// first check if user is logged in
if ( is_user_logged_in() ) {
$current_user = wp_get_current_user();
switch ($input) {
case 'billing_first_name':
case 'shipping_first_name':
$value = 'Jack'; // fixed default
break;
case 'billing_last_name':
case 'shipping_last_name':
$value = $current_user->user_lastname; // use lastname from user profile
break;
default:
// don't change if we don't have substituting data
break;
}
}
return $value;
},10 ,2 );
In the same method there's also a filter default_checkout_{form_field} that would let you check existing values first (the former is a short-circuit that prevents the normal default from loading), ex:
add_filter('default_checkout_billing_first_name', 'woocommerce_override_default_checkout_values', 10, 2 );
add_filter('default_checkout_billing_last_name', 'woocommerce_override_default_checkout_values', 10, 2 );
add_filter('default_checkout_shipping_first_name', 'woocommerce_override_default_checkout_values', 10, 2 );
add_filter('default_checkout_shipping_last_name', 'woocommerce_override_default_checkout_values', 10, 2 );
function woocommerce_override_default_checkout_values( $value, $input ) {
// first check if user is logged in
if ( is_user_logged_in() ) {
// only load if value is empty
if (empty($value)) {
// read your own
$value = '...';
}
}
return $value;
}