在 WooCommerce 中，我需要在结账页面添加一个“billing_legal_person”自定义字段，该字段可以在“个人”和“公司”之间进行选择，以反映客户是否应作为公司或个人纳税。那么，适用的增值税百分比应该根据该 billing_legal_person 选择的内容而不同。
我已成功创建 2 个税级：针对个人的默认（标准）税级和针对公司的新“公司”级。
我还可以使用以下代码成功地以编程方式申请一种税级或另一种税级：
add_filter( 'woocommerce_product_get_tax_class', 'my_set_taxrate_for_billing_legal_person', 10, 2 );
add_filter( 'woocommerce_product_variation_get_tax_class', 'my_set_taxrate_for_billing_legal_person', 10, 2 );
function my_set_taxrate_for_billing_legal_person( $tax_class, $product ) {
// Commenting the line below, standard tax class is applied
$tax_class = 'companies';
return $tax_class;
}
我使用 Checkout Field Editor 插件轻松创建
billing_legal_person在更改我的
billing_legal_personadd_filter( 'woocommerce_checkout_fields', 'my_checkout_fields_trigger_refresh', 9999 );
function my_checkout_fields_trigger_refresh( $fields ) {
$fields['billing']['billing_legal_person']['class'][] = 'update_totals_on_change';
return $fields;
}
我的问题是在
my_set_taxrate_for_billing_legal_person()billing_legal_person如果我检查
WC()->checkout->get_checkout_fields['billing_legal_person']如果我检查
WC()->checkout->checkout->get_value('billing_first_name')WC()->checkout->checkout->get_value('billing_legal_person')NULLbilling_first_namebilling_legal_person所有基于检查的方法
$_POST['billing_legal_person']关于如何从
billing_legal_personmy_set_taxrate_for_billing_legal_person()首先，不要使用结帐字段编辑器插件添加“billing_legal_person”自定义结帐字段，而是我们将使用手动编码的函数。
另外，删除您的
my_set_taxrate_for_billing_legal_person()下面的代码将：
add_filter('woocommerce_billing_fields', 'add_legal_person_billing_field');
function add_legal_person_billing_field( $fields ) {
$fields['billing_company']['class'][] = 'hidden';
$fields['billing_legal_person'] = array(
'label' => __( 'Legal person', 'woocommerce' ),
'type' => 'select',
'options' => [
'' => __("Choose an option", "woocommerce"),
'Person' => __("Person", "woocommerce"),
'Company' => __("Company", "woocommerce"),
],
'required' => true,
'priority' => 25,
);
return $fields;
}
// Validate Billing company field
add_action( 'woocommerce_checkout_process', 'validate_custom_checkout_fields' );
function validate_custom_checkout_fields() {
if ( isset($_POST['billing_legal_person']) && $_POST['billing_legal_person'] === 'Company'
&& isset($_POST['billing_company']) && empty($_POST['billing_company']) ) {
wc_add_notice('Billing company is a required field.', 'error');
}
}
// PHP: Replace "(optional)" with required for Billing company
add_filter( 'woocommerce_form_field' , 'remove_checkout_optional_fields_label', 10, 4 );
function remove_checkout_optional_fields_label( $field, $key, $args, $value ) {
// Only on checkout page
if( ( ( is_checkout() && ! is_wc_endpoint_url() )
|| is_wc_endpoint_url('edit-address') ) && $key === 'billing_company' ) {
$optional = ' <span class="optional">(' . esc_html__( 'optional', 'woocommerce' ) . ')</span>';
$required = ' <abbr class="required" title="required">*</abbr>';
$field = str_replace( $optional, $required, $field );
}
return $field;
}
// Hide Billing company field on checkout page load
add_action('wp_head', 'checkout_legal_person_css');
function checkout_legal_person_css() {
if ( ( is_checkout() && ! is_wc_endpoint_url() ) || is_wc_endpoint_url('edit-address') ) : ?>
<style>
#billing_company_field.hidden {display:none !important;}
</style>
<?php endif;
}
// JavaScript / Ajax: Show/hide billing company and set the tax rate via Ajax
add_action( 'template_redirect' , 'checkout_legal_person_js' );
function checkout_legal_person_js() {
if ( ( is_checkout() && ! is_wc_endpoint_url() ) || is_wc_endpoint_url('edit-address') ) :
$legal_person = WC()->customer->get_meta('billing_legal_person');
if ( is_checkout() && $legal_person ) {
WC()->session->set('legal_person', $legal_person);
}
wc_enqueue_js("
const company = '#billing_company',
companyField = company+'_field',
legalPers = '#billing_legal_person',
isCheckout = ".( is_checkout() ? 'true' : 'false' ).";
function showHideCompanyField( legalPers, companyField ) {
if ( $(legalPers).val() === 'Company' ) {
$(companyField).show();
} else {
$(companyField).hide();
}
}
// On start:
$(legalPers).selectWoo();
$(companyField).addClass('validate-required woocommerce-invalid woocommerce-invalid-required-field');
showHideCompanyField( legalPers, companyField );
$(companyField).removeClass('hidden');
// On Legal Person change: Show/Hide company field
$('form.woocommerce-checkout,.woocommerce-edit-address form').on('change', legalPers, function() {
showHideCompanyField( legalPers, companyField );
if ( isCheckout ) {
$.ajax({
type: 'POST',
url: '".admin_url('admin-ajax.php')."',
data: {
'action': 'legal_person_tax',
'legal_person' : $(legalPers).val(),
},
success: function (response) {
$(document.body).trigger('update_checkout');
console.log(response);
}
});
}
});
");
endif;
}
// PHP AJAX receiver: Set "legal_person" session variable
add_action('wp_ajax_legal_person_tax', 'set_legal_person_tax' );
add_action('wp_ajax_nopriv_legal_person_tax', 'set_legal_person_tax' );
function set_legal_person_tax() {
if ( isset($_POST['legal_person']) && ! empty($_POST['legal_person']) ) {
WC()->session->set('legal_person', esc_attr($_POST['legal_person']));
}
wp_die(esc_attr($_POST['legal_person']));
}
// Dynamically change tax rate based on chosen "legal_person"
add_action('woocommerce_before_calculate_totals', 'define_cart_item_tax_class_for_companies');
function define_cart_item_tax_class_for_companies( $cart )
{
if ((is_admin() && !defined('DOING_AJAX')))
return;
if (did_action('woocommerce_before_calculate_totals') >= 2)
return;
$legal_person = WC()->session->get('legal_person');
$legal_person = $legal_person ? $legal_person : WC()->customer->get_meta('billing_legal_person');
if ( $legal_person === 'Company' ) {
// Loop through cart items and set the updated price
foreach ($cart->get_cart() as $item) {
$item['data']->set_tax_class('companies'); // Set tax class
}
}
}
// Remove session variable when order is placed
add_action('woocommerce_checkout_order_created', 'unset_legal_person_session_variable');
function unset_legal_person_session_variable() {
WC()->session->__unset('legal_person');
}
// Change tax rate if customer is a a company
add_filter( 'woocommerce_product_get_tax_class', 'tax_rate_based_on_chosen_legal_person', 10, 2 );
add_filter( 'woocommerce_product_variation_get_tax_class', 'tax_rate_based_on_chosen_legal_person', 10, 2 );
function tax_rate_based_on_chosen_legal_person( $tax_class, $product ) {
$legal_person = WC()->customer->get_meta('billing_legal_person');
if ( $legal_person === 'Company' ) {
$tax_class = 'companies';
}
return $tax_class;
}
代码位于子主题的functions.php 文件中（或插件中）。已测试并有效。