php - 有条件必填的 WooCommerce 结帐字段

Question

我想要创建一个 WooCommerce 结账字段，该字段仅在选择特定付款(货到付款)时显示。仅当选择货到付款时，才应显示此字段并且仅需要此字段。我已经设法创建该字段并有条件地显示它，但我无法弄清楚如何仅在选择 COD 时才需要它。

/* Only show EAN when COD chosen */

// Conditional Show hide checkout fields based on chosen payment methods
add_action( 'wp_footer', 'conditionally_show_hide_billing_custom_field' );
function conditionally_show_hide_billing_custom_field(){
    // Only on checkout page
     if ( is_checkout() && ! is_wc_endpoint_url() ) :
    ?>
    <script>
        jQuery(function($){
            var a = 'input[name="payment_method"]',
                b = a + ':checked',
                c = '#billing_options_field'; // The checkout field <p> container selector

            // Function that shows or hide checkout fields
            function showHide( selector = '', action = 'show' ){
                if( action == 'show' )
                    $(selector).show( 200, function(){
                        $(this).addClass("validate-required");
                    });
                else
                    $(selector).hide( 200, function(){
                        $(this).removeClass("validate-required");
                    });
                $(selector).removeClass("woocommerce-validated");
                $(selector).removeClass("woocommerce-invalid woocommerce-invalid-required-field");
            }

            // Initialising: Hide if choosen payment method is "cod"
            if( $(b).val() !== 'cod' )
                showHide( c, 'hide' );
            else
                showHide( c );

            // Live event (When payment method is changed): Show or Hide based on "cod"
            $( 'form.checkout' ).on( 'change', a, function() {
                if( $(b).val() !== 'cod' )
                    showHide( c, 'hide' );
                else
                    showHide( c );
            });
        });
    </script>
    <?php
    endif;
}

/* Add extra field and make it required */

add_filter('woocommerce_billing_fields', 'custom_woocommerce_billing_fields');

function custom_woocommerce_billing_fields($fields)
{

    $fields['billing_options'] = array(
        'label' => __('– EAN-nummer – ', 'woocommerce'), // Add custom field label
        'placeholder' => _x('EAN nummer', 'placeholder', 'woocommerce'), // Add custom field placeholder
        'required' => true, // if field is required or not
        'clear' => false, // add clear or not
        'type' => 'text', // add field type
        'class' => array('my-css')    // add class name
    );

    return $fields;
}

Answer 1

add_action('woocommerce_after_checkout_validation', 'woocommerce_after_checkout_validation_alter', 10, 2);

function woocommerce_after_checkout_validation_alter($data, $errors){

    if('cod' !== $data['payment_method']){
        if($errors->get_error_data('billing_options_required')){ // This will contain the error
            $errors->remove('billing_options_required');
        }
    }
    return $data;
}

如果选择的付款方式不是 COD，则从错误对象中删除验证错误。错误对象如下所示。

WP_Error Object
(
    [errors] => Array
        (
            [billing_options_required] => Array
                (
                    [0] => <strong>Billing – EAN-nummer – </strong> is a required field.
                )

        )

    [error_data] => Array
        (
            [billing_options_required] => Array
                (
                    [id] => billing_options
                )

        )

    [additional_data:protected] => Array
        (
        )

)