基于 Woocommerce 中产品类别的条件自定义结帐字段

我正在使用 woocommerce 作为一个非营利组织的网站，该网站出售课程门票和活动门票。当有人报名参加课程时，需要列出他们的紧急联系信息并同意免责。当他们购买活动门票时，非营利组织不需要紧急联系信息或责任免除。所以......他们希望这些字段仅在该人使用课程门票结帐时才出现在 woocommerce 结账上。合理？

几个月前，当他们第一次将类添加到网站时，我想出了如何添加自定义字段和自定义责任发布。我在 woocommerce 中创建了一个“class”产品类别，并创建了一个函数来测试购物车中属于该类别的任何产品，这样我就可以有条件地显示这些字段。

所有这些函数都在我的functions.php 文件中，我现在正在运行条件语句来检查每个函数中的“类”类别。我需要帮助学习如何检查“类”类别一次，然后运行显示字段的函数，验证字段，将数据添加到数据库并生成新的订单电子邮件。合理？

这是我目前所拥有的：

// Add fields for Emergency Contact & Medical Information to the checkout page
add_action('woocommerce_after_order_notes', 'customise_checkout_field');

function customise_checkout_field($checkout)
{

    // Check to see if there is a class in the cart
    // function is at the end
    $class_in_cart = is_conditional_product_in_cart( 'class' );

    // There is a class in the cart so show additional fields
    if ( $class_in_cart === true ) {

    echo '<div id="customise_checkout_field"><h3>' . __('Emergency Contact & Medical Information') . '</h3>';
    woocommerce_form_field('emergency_contact', array(
        'type' => 'text',
        'class' => array(
            'emergency-contact form-row-wide'
        ) ,
        'label' => __('Emergency Contact') ,
        'placeholder' => __('Please enter first & last name') ,
        'required' => true,
    ) , $checkout->get_value('emergency_contact'));
    woocommerce_form_field('emergency_contact_relationship', array(
        'type' => 'text',
        'class' => array(
            'emergency-contact-relationship form-row-wide'
        ) ,
        'label' => __('What is your relationship with this person?') ,
        'placeholder' => __('Example: Mother') ,
        'required' => true,
    ) , $checkout->get_value('emergency_contact_relationship'));
    woocommerce_form_field('emergency_contact_phone', array(
        'type' => 'text',
        'class' => array(
            'emergency-contact-phone form-row-wide'
        ) ,
        'label' => __('What is their phone number?') ,
        'placeholder' => __('(555) 555-5555') ,
        'required' => true,
    ) , $checkout->get_value('emergency_contact_phone'));
    woocommerce_form_field('medical_medicine', array(
        'type' => 'textarea',
        'class' => array(
            'medical-medicine form-row-wide'
        ) ,
        'label' => __('Do you have any medical conditions and are you taking any medications we need to be aware of?') ,
        'placeholder' => __('If not please write in "none"') ,
        'required' => true,
    ) , $checkout->get_value('medical_medicine'));
    echo '</div>';
    }
}

// Process emergency contact fields

add_action('woocommerce_checkout_process', 'custom_checkout_fields_process');

function custom_checkout_fields_process() {
    // Check to see if there is a class in the cart
    $class_in_cart = is_conditional_product_in_cart( 'class' );

    // There is a class in the cart so show additional fields
    if ( $class_in_cart === true ) {

        // if the field is set, if not then show an error message.
        if (!$_POST['emergency_contact']) wc_add_notice(__('Please list an emergency contact.') , 'error');
        if (!$_POST['emergency_contact_relationship']) wc_add_notice(__('Please indicate your relationship with your emergency contact.') , 'error');
        if (!$_POST['emergency_contact_phone']) wc_add_notice(__('Please list a phone number for your emergency contact.') , 'error');
        if (!$_POST['medical_medicine']) wc_add_notice(__('Please list any medications or write in "none".') , 'error');
    }
}

// Add emergency contact information to the database

add_action('woocommerce_checkout_update_order_meta', 'custom_checkout_fields_update_order_meta');

function custom_checkout_fields_update_order_meta($order_id) {
    // Check to see if there is a class in the cart
    $class_in_cart = is_conditional_product_in_cart( 'class' );

    // There is a class in the cart so show additional fields
    if ( $class_in_cart === true ) {
        if (!empty($_POST['emergency_contact'])) {
            update_post_meta($order_id, 'emergency_contact', sanitize_text_field($_POST['emergency_contact']));
        }
        if (!empty($_POST['emergency_contact_relationship'])) {
            update_post_meta($order_id, 'emergency_contact_relationship', sanitize_text_field($_POST['emergency_contact_relationship']));
        }
        if (!empty($_POST['emergency_contact_phone'])) {
            update_post_meta($order_id, 'emergency_contact_phone', sanitize_text_field($_POST['emergency_contact_phone']));
        }
        if (!empty($_POST['medical_medicine'])) {
            update_post_meta($order_id, 'medical_medicine', sanitize_text_field($_POST['medical_medicine']));
        }
    }
}

// Add the emergency contact fields to order email

add_filter( 'woocommerce_email_order_meta_keys', 'my_custom_checkout_field_order_meta_keys' );
function my_custom_checkout_field_order_meta_keys( $keys ) {
    // Check to see if there is a class in the cart
    $class_in_cart = is_conditional_product_in_cart( 'class' );

    // There is a class in the cart so show additional fields
    if ( $class_in_cart === true ) {
        echo '<h2>Emergency Contact & Medical Information:</h2>';
        $keys['Emergency Contact'] = 'emergency_contact';
        $keys['Emergency Contact Relationship'] = 'emergency_contact_relationship';
        $keys['Emergency Contact Phone'] = 'emergency_contact_phone';
        $keys['Medical Conditions & Medications'] = 'medical_medicine';
        return $keys;
    } // end class in cart condition
}

/*-----------------------------------------------------------------------------------------------------------------------------------------------*/

// Add custom checkboxes to woocommerce checkout page for Photo Release, Mailing List & Release of Liability
// add_action( 'woocommerce_after_order_notes', 'custom_checkout_fields' );
add_action( 'woocommerce_review_order_before_submit', 'custom_checkout_fields' );
function custom_checkout_fields() {
    echo '<div id="custom_checkout_fields">
    <h3>Mailing Lists</h3>
    <p>Mailing List boilerplate';

    woocommerce_form_field( 'mailing_consent', array(
        'type'      => 'checkbox',
        'class'     => array('input-checkbox'),
        'label'     => __('Please add me to Nonprofit\'s electronic and paper mailing lists.'),
        'required'  => false,
        'clear'     => true,
        'default'   => 1 //This will pre-select the checkbox
    ),  WC()->checkout->get_value( 'mailing_consent' ) );

    // Check to see if there is a class in the cart
    $class_in_cart = is_conditional_product_in_cart( 'class' );

    // There is a class in the cart so show additional fields
    if ( $class_in_cart === true ) {

        echo '<h3>Photo Release</h3>
        <p>Photo Release Boilerplate</p>';

        woocommerce_form_field( 'photo_consent', array(
            'type'      => 'checkbox',
            'class'     => array('input-checkbox'),
            'label'     => __('I agree to the Photo Release as outlined above.'),
            'required'  => false,
            'clear'     => true,
            'default'   => 1 //This will pre-select the checkbox
        ),  WC()->checkout->get_value( 'photo_consent' ) );

        echo '<h3>Release of Liability</h3>
        <p>Release of Liability Boilerplate</p>';

        woocommerce_form_field( 'liability_release', array(
            'type'      => 'checkbox',
            'class'     => array('input-checkbox'),
            'label'     => __('I agree to the Photo Release as outlined above.'),
            'required'  => true,
            'clear'     => true,
            'default'   => 1 //This will pre-select the checkbox
        ),  WC()->checkout->get_value( 'liability_release' ) );

    } // end class in cart condition

    echo '</div>';
}

// Show notice if customer doesn't check the Release of Liability checkbox
add_action( 'woocommerce_checkout_process', 'liability_release_not_given' );

function liability_release_not_given() {
    // Check to see if there is a class in the cart
    $class_in_cart = is_conditional_product_in_cart( 'class' );

    // There is a class in the cart so show additional fields
    if ( $class_in_cart === true ) {
        if ( ! (int) isset( $_POST['liability_release'] ) ) {
            wc_add_notice( __( 'You must agree to the Release of Liability to register for this class.  Please contact us with any questions.' ), 'error' );
        }
    } // end class in cart condition
}

// Save the custom checkout field in the order meta, when checkbox has been checked
add_action( 'woocommerce_checkout_update_order_meta', 'custom_checkout_field_update_order_meta', 10, 1 );
function custom_checkout_field_update_order_meta( $order_id ) {

    if ( ! empty( $_POST['mailing_consent'] ) )
        update_post_meta( $order_id, 'mailing_consent', $_POST['mailing_consent'] );

    if ( ! empty( $_POST['photo_consent'] ) )
        update_post_meta( $order_id, 'photo_consent', $_POST['photo_consent'] );

    if ( ! empty( $_POST['liability_release'] ) )
        update_post_meta( $order_id, 'liability_release', $_POST['liability_release'] );
}

/*-----------------------------------------------------------------------------------------------------------------------------------------------*/

// Display custom field results on the order edit page (backend)
// for various liability fields

add_action( 'woocommerce_admin_order_data_after_billing_address', 'display_custom_field_on_order_edit_pages', 10, 1 );
function display_custom_field_on_order_edit_pages( $order ){

    $mailing_consent = get_post_meta( $order->get_id(), 'mailing_consent', true );
    if( $mailing_consent == 1 )
        echo '<p>' . $order->billing_first_name . ' ' . $order->billing_last_name . ' agreed to the be added to Nonprofit\'s mailing lists.</p>';

    $photo_consent = get_post_meta( $order->get_id(), 'photo_consent', true );
    if( $photo_consent == 1 )
        echo '<p>' . $order->billing_first_name . ' ' . $order->billing_last_name . ' agreed to the Photo Release.</p>';

    $liability_release = get_post_meta( $order->get_id(), 'liability_release', true );
    if( $liability_release == 1 )
        echo '<p>' . $order->billing_first_name . ' ' . $order->billing_last_name . ' agreed to the Release of Liability.</p>';
}


/**
 * Check if Class is In cart
 *
 * https://wordimpress.com/create-conditional-checkout-fields-woocommerce/
 * https://businessbloomer.com/woocommerce-check-product-category-cart/
 *
 * @param $product_id
 *
 * @return bool
 */
function is_conditional_product_in_cart( $category_name ) {
    //Check to see if user has a class in their cart
    global $woocommerce;

    //flag no class in cart
    $class_in_cart = false;

    foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {
        $_product = $values['data'];

    //  if ( $_product->cat === $category_id ) {
        //  //class is in cart!
            //$class_in_cart = true;

        if (has_term ( $category_name, 'product_cat', $_product->get_id() ) ) {
            //class is in cart!
            $class_in_cart = true;
        }
    }

    return $class_in_cart;

}

正如你可能知道的那样，我从网络上的各种来源将其拼凑在一起，我意识到这有点混乱。目前的条件语句：

// Check to see if there is a class in the cart
$class_in_cart = is_conditional_product_in_cart( 'class' );

// There is a class in the cart so show additional fields
if ( $class_in_cart === true ) {

每个函数都会重复。我知道这效率不高，但我不知道如何解决它。我想做的是这样的：

1. 测试“class”类别的产品
2. 如果是“class”，则运行所有功能来显示和处理紧急联系人字段以及照片发布和责任字段发布
3. 无论购物车中是否有“类别”，都显示“加入邮件列表”协议，并无论如何处理该字段。

我尝试将所有内容包装在另一个函数中，但这破坏了代码。也许最好将其移至插件中？

感谢您提供的任何想法和帮助。

首先，您使用的条件函数代码确实很旧、过时并且不管用当购物车商品是产品变体时（对于可变产品也是如此）。下面是紧凑且有效的条件函数......
它可以使用任何产品类别术语 ID、slug、名称或值数组：

function is_product_cat_in_cart( $categories ) {
    foreach ( WC()->cart->get_cart() as $cart_item ) {
        if (has_term ( $categories, 'product_cat', $cart_item['product_id'] ) )
            return true;
    }
    return false;
}

现在，您的其余代码有很多错误或很小的错误。

它还使用过时或已弃用的挂钩，例如：

• woocommerce_checkout_update_order_meta取而代之的是一个非常合适的钩子。
• woocommerce_email_order_meta_keys很长时间以来已被弃用。

您还可以将一些代码合并到相同的挂钩函数中。

您不需要到处都使用条件函数。它只是结账字段条件显示所需要的。

这是您重新访问的代码（适用于 woocommerce 版本 3 及更高版本）:

// Add fields for Emergency Contact & Medical Information to the checkout page
add_action('woocommerce_after_order_notes', 'customise_checkout_field', 20, 1 );
function customise_checkout_field( $checkout ){
    $domain = 'woocommerce';

    // There is a class in the cart so show additional fields
    if ( is_product_cat_in_cart( 'class' ) ):

    echo '<div id="customise_checkout_field">
    <h3>' . __( 'Emergency Contact & Medical Information', $domain ) . '</h3>';

    woocommerce_form_field( 'emergency_contact', array(
        'type'          => 'text',
        'class'         => array( 'emergency-contact form-row-wide' ),
        'label'         => __( 'Emergency Contact', $domain ) ,
        'placeholder'   => __( 'Please enter first & last name', $domain ),
        'required'      => true,
    ), $checkout->get_value('emergency_contact') );

    woocommerce_form_field( 'emergency_contact_relationship', array(
        'type'          => 'text',
        'class'         => array( 'emergency-contact-relationship form-row-wide' ),
        'label'         => __( 'What is your relationship with this person?', $domain ),
        'placeholder'   => __( 'Example: Mother', $domain ) ,
        'required'      => true,
    ), $checkout->get_value('emergency_contact_relationship') );

    woocommerce_form_field( 'emergency_contact_phone', array(
        'type'          => 'text',
        'class'         => array( 'emergency-contact-phone form-row-wide' ),
        'label'         => __( 'What is their phone number?', $domain ),
        'placeholder'   => __( '(555) 555-5555', $domain ),
        'required'      => true,
    ), $checkout->get_value('emergency_contact_phone') );

    woocommerce_form_field( 'medical_medicine', array(
        'type'          => 'textarea',
        'class'         => array( 'medical-medicine form-row-wide' ) ,
        'label'         => __( 'Do you have any medical conditions and are you taking any medications we need to be aware of?', $domain ),
        'placeholder'   => __( 'If not please write in "none"', $domain ),
        'required'      => true,
    ) , $checkout->get_value('medical_medicine') );
    echo '</div>';

    endif;
}

// Add custom checkboxes to woocommerce checkout page for Photo Release, Mailing List & Release of Liability
add_action( 'woocommerce_review_order_before_submit', 'custom_checkout_fields' );
function custom_checkout_fields() {
    $checkout = WC()->checkout;
    $domain   = 'woocommerce';

    echo '<div id="custom_checkout_fields">
    <h3>'.__( 'Mailing Lists', $domain ).'</h3>
    <p>'.__( 'Mailing List boilerplate', $domain ).'</p>';

    woocommerce_form_field( 'mailing_consent', array(
        'type'      => 'checkbox',
        'class'     => array('input-checkbox'),
        'label'     => __( 'Please add me to Nonprofit\'s electronic and paper mailing lists.', $domain ),
        'required'  => false,
        'clear'     => true,
        'default'   => 1 //This will pre-select the checkbox
    ),  $checkout->get_value( 'mailing_consent' ) );

    // There is a class in the cart so show additional fields
    if ( is_product_cat_in_cart( 'class' ) ):

    echo '<h3>'.__( 'Photo Release', $domain ).'</h3>
    <p>'.__( 'Photo Release Boilerplate', $domain ).'</p>';

    woocommerce_form_field( 'photo_consent', array(
        'type'      => 'checkbox',
        'class'     => array('input-checkbox'),
        'label'     => __( 'I agree to the Photo Release as outlined above.', $domain ),
        'required'  => false,
        'clear'     => true,
        'default'   => 1 //This will pre-select the checkbox
    ),  $checkout->get_value( 'photo_consent' ) );

    echo '<h3>'.__( 'Release of Liability', $domain ).'</h3>
    <p>'.__( 'Release of Liability Boilerplate', $domain ).'</p>';

    woocommerce_form_field( 'liability_release', array(
        'type'      => 'checkbox',
        'class'     => array('input-checkbox'),
        'label'     => __( 'I agree to the Photo Release as outlined above.', $domain ),
        'required'  => true,
        'clear'     => true,
        'default'   => 1 //This will pre-select the checkbox
    ),  $checkout->get_value( 'liability_release' ) );

    endif;

    echo '</div>';
}

// Custom checkout fields validation
add_action('woocommerce_checkout_process', 'custom_checkout_fields_process');
function custom_checkout_fields_process() {
    $domain = 'woocommerce';

    if ( isset($_POST['emergency_contact']) && empty($_POST['emergency_contact']) )
        wc_add_notice( __( 'Please list an emergency contact.', $domain ) , 'error' );

    if ( isset($_POST['emergency_contact_relationship']) && empty($_POST['emergency_contact']) )
        wc_add_notice( __( 'Please indicate your relationship with your emergency contact.', $domain ), 'error' );

    if ( isset($_POST['emergency_contact_phone']) && empty($_POST['emergency_contact']) )
        wc_add_notice( __( 'Please list a phone number for your emergency contact.', $domain ), 'error' );

    if ( isset($_POST['medical_medicine']) && empty($_POST['emergency_contact']) )
        wc_add_notice( __( 'Please list any medications or write in "none".', $domain ), 'error' );

    // Other checkout fields
    if ( ! isset( $_POST['liability_release'] ) && ! $_POST['liability_release'] && isset($_POST['photo_consent']) )
        wc_add_notice( __( 'You must agree to the Release of Liability to register for this class.  Please contact us with any questions.', $domain ), 'error' );
}

// Save custom checkout fields in the order meta data
add_action( 'woocommerce_checkout_create_order', 'custom_checkout_fields_in_order_meta_data', 20, 2 );
function custom_checkout_fields_in_order_meta_data( $order, $data ) {

    if ( isset($_POST['emergency_contact']) && ! empty($_POST['emergency_contact']) )
        $order->update_meta_data( 'emergency_contact', sanitize_text_field($_POST['emergency_contact']) );

    if ( isset($_POST['emergency_contact_relationship']) && ! empty($_POST['emergency_contact_relationship']) )
        $order->update_meta_data( 'emergency_contact_relationship', sanitize_text_field($_POST['emergency_contact_relationship']) );

    if ( isset($_POST['emergency_contact_phone']) && ! empty($_POST['emergency_contact_phone']) )
        $order->update_meta_data( 'emergency_contact_phone', sanitize_text_field($_POST['emergency_contact_phone']) );

    if ( isset($_POST['medical_medicine']) && ! empty($_POST['medical_medicine']) )
        $order->update_meta_data( 'medical_medicine', sanitize_text_field($_POST['medical_medicine']) );

    if ( isset($_POST['mailing_consent']) && ! empty($_POST['mailing_consent']) )
        $order->update_meta_data( 'mailing_consent', '1' );

    if ( isset( $_POST['photo_consent']) && ! empty($_POST['photo_consent']) )
        $order->update_meta_data( 'photo_consent', '1' );

    if ( isset( $_POST['liability_release']) && ! empty($_POST['liability_release']) )
        $order->update_meta_data( 'liability_release', '1' );
}

// Add the emergency contact fields to email notifications
add_filter( 'woocommerce_email_order_meta_fields', 'custom_checkout_field_email_order_meta', 20, 3 );
function custom_checkout_field_email_order_meta( $fields, $sent_to_admin, $order ) {
    $domain = 'woocommerce';

    if( ! $order->get_meta( 'emergency_contact' ) )
        return $fields; // Exit if not set in the order

    echo '<h2>'.__( 'Emergency Contact & Medical Information', $domain ).'</h2>';

    $fields[] = array( 'label' => __( 'Emergency contact', $domain ),
        'value' => $order->get_meta( 'emergency_contact' ) );

    $fields[] = array( 'label' => __( 'Emergency Contact Relationship', $domain ),
        'value' => $order->get_meta( 'emergency_contact_relationship' ) );

    $fields[] = array( 'label' => __( 'Emergency Contact Phone', $domain ),
        'value' => $order->get_meta( 'emergency_contact_phone' ) );

    $fields[] = array( 'label' => __( 'Medical Conditions & Medications', $domain ),
        'value' => $order->get_meta( 'medical_medicine' ) );

    return $fields;
}

// Display some custom checkout fields in Order edit pages
add_action( 'woocommerce_admin_order_data_after_billing_address', 'display_custom_field_on_order_edit_pages', 20, 1 );
function display_custom_field_on_order_edit_pages( $order ){
    $domain = 'woocommerce';

    $billing_name = $order->get_billing_first_name().' '.$order->get_billing_last_name();

    if( $order->get_meta('mailing_consent') )
        echo '<p>' . $billing_name . __( ' agreed to the be added to Nonprofit\'s mailing lists.', $domain ).'</p>';

    if( $order->get_meta('photo_consent') )
        echo '<p>' . $billing_name . __( ' agreed to the Photo Release.', $domain ).'</p>';

    if( $order->get_meta('liability_release') )
        echo '<p>' . $billing_name . __( ' agreed to the Release of Liability.', $domain ).'</p>';
}

代码位于活动子主题（或活动主题）的 function.php 文件中。经过测试并有效。

结论：如果某些代码在 function.php 文件中不起作用，那么它在插件中也不会更好地工作。但如果您愿意，可以将其添加到插件中。