Alphabet characters only for billing and shipping names in WooCommerce

Question

How can I restrict only alphabet characters in the billing first name, billing last name, shipping first name and shipping last name in WooCommerce checkout?

I am trying the following in the my Child Theme's functions.php file and it is causing the checkout section to not appear when I go to checkout in WooCommerce. Please advise.

add_filter('woocommerce_checkout_fields', 'custom_override_checkout_fields');

function custom_override_checkout_fields($fields) {
    $fields['billing']['billing_first_name'] = array(
        'label' => __('First name', 'woocommerce'),
        'placeholder' => _x('First name', 'placeholder', 'woocommerce'),
        'required' => false,
        'clear' => false,
        'type' => 'text',
        'class' => array(
            'alpha'
        )
    );
}

Place return $fields before the final closing curly brace of the custom_override_checkout_fields function. — Spartacus

Raunak Gupta Raunak Gupta · Accepted Answer · 2017-03-17T03:35:04

You can do this by validating checkout form submit at server side by using woocommerce_checkout_process hook, and PHP ctype_alpha() function.

Here is the code:

add_action('woocommerce_checkout_process', 'wh_alphaCheckCheckoutFields');

function wh_alphaCheckCheckoutFields() {
    $billing_first_name = filter_input(INPUT_POST, 'billing_first_name');
    $billing_last_name = filter_input(INPUT_POST, 'billing_last_name');
    $shipping_first_name = filter_input(INPUT_POST, 'shipping_first_name');
    $shipping_last_name = filter_input(INPUT_POST, 'shipping_last_name');
    $ship_to_different_address = filter_input(INPUT_POST, 'ship_to_different_address');

    if (empty(trim($billing_first_name)) || !ctype_alpha($billing_first_name)) {
        wc_add_notice(__('Only alphabets are alowed in <strong>Billing First Name</strong>.'), 'error');
    }
    if (empty(trim($billing_last_name)) || !ctype_alpha($billing_last_name)) {
        wc_add_notice(__('Only alphabets are alowed in <strong>Billing Last Name</strong>.'), 'error');
    }
    // Check if Ship to a different address is set, if it's set then validate shipping fields.
    if (!empty($ship_to_different_address)) {
        if (empty(trim($shipping_first_name)) || !ctype_alpha($shipping_first_name)) {
            wc_add_notice(__('Only alphabets are alowed in <strong>Shipping First Name</strong>.'), 'error');
        }
        if (empty(trim($shipping_last_name)) || !ctype_alpha($shipping_last_name)) {
            wc_add_notice(__('Only alphabets are alowed in <strong>Shipping Last Name</strong>.'), 'error');
        }
    }
}

Code goes in functions.php file of your active child theme (or theme). Or also in any plugin PHP files.
Code is tested and works.

Hope this helps!

Alphabet characters only for billing and shipping names in WooCommerce

1 Answers