显示 WooCommerce 从自定义字段中选择的变体附加费用

Question

根据产品自定义字段在 Woocommerce 中启用特定费用答案，我有以下代码：

// Create and display Backend Product custom field
add_action('woocommerce_product_options_general_product_data', 'ba_adding_custom_product_general_field');
function ba_adding_custom_product_general_field()
{
    global $woocommerce, $post;
    echo '<div class="options_group">';

    // Custom fields will be created here...

    woocommerce_wp_text_input(array(
        'id' => '_number_field',
        'label' => __('Environmental fee', 'woocommerce'),
        'placeholder' => '',
        'description' => __('Enter the custom value here.', 'woocommerce'),
        'type' => 'number',
        'custom_attributes' => array(
            'step' => 'any',
            'min' => '0'
        )
    ));

    echo '</div>';
}

// Save the submitted data from Backend Product custom field
add_action('woocommerce_process_product_meta', 'ba_saving_custom_product_general_field');
function ba_saving_custom_product_general_field($post_id)
{

    // Get the submitted value
    $woocommerce_number_field = isset($_POST['_number_field']) ? $_POST['_number_field'] : '';

    // Create/Update the submitted value in postmeta table for this product
    update_post_meta($post_id, '_number_field', esc_attr($woocommerce_number_field));
}

// Adding a custom fee to cart based on a product custom field value calculation
add_action('woocommerce_cart_calculate_fees', 'ba_custom_cart_fee');
function ba_custom_cart_fee($cart_object)
{
    // Initializing variables
    $fee = 0;

    // Iterating through each cart items
    foreach ($cart_object->get_cart() as $cart_item) {
        $item_fee = 0;

        if ($cart_item['variation_id'] > 0) {
            // If it's a variation, get its custom field value
            $item_id = $cart_item['variation_id'];
            $item_fee = get_post_meta($item_id, '_number_field_variation', true);
        } else {
            // If it's a simple product, get its custom field value
            $item_id = $cart_item['product_id'];
            $item_fee = get_post_meta($item_id, '_number_field', true);
        }

        // Adding the calculation to the fee
        $fee += $cart_item['quantity'] * $item_fee;
    }

    // Adding fee to cart if it's not zero
    if ($fee != 0) {
        $cart_object->add_fee(__('Handling fee', 'woocommerce'), $fee, true, 'standard');
    }
}

// Adding custom text on product page for the custom fee
add_action('woocommerce_single_product_summary', 'ba_display_custom_product_text', 25);
function ba_display_custom_product_text()
{
    global $product;

    // Getting the corresponding product custom field value
    $item_fee = get_post_meta($product->get_id(), '_number_field', true);

    // Getting the currency symbol
    $currency_symbol = get_woocommerce_currency_symbol();

    // Displaying custom text if fee is set
    if ($item_fee) {
        echo '<p style="margin-top: 10px; color: red;">You pay ' . $item_fee . ' ' . $currency_symbol . ' warranty for this product.</p>';
    }
}

// Create and display Backend Product custom field for variations
add_action('woocommerce_product_after_variable_attributes', 'ba_adding_custom_variation_field', 10, 3);
function ba_adding_custom_variation_field($loop, $variation_data, $variation)
{
    woocommerce_wp_text_input(array(
        'id' => '_number_field_variation[' . $variation->ID . ']',
        'label' => __('Environmental fee', 'woocommerce'),
        'placeholder' => '',
        'description' => __('Enter the custom value here.', 'woocommerce'),
        'type' => 'number',
        'custom_attributes' => array(
            'step' => 'any',
            'min' => '0'
        ),
        'value' => get_post_meta($variation->ID, '_number_field_variation', true)
    ));
}

// Save the submitted data from Backend Product custom field for variations
add_action('woocommerce_save_product_variation', 'ba_saving_custom_variation_field', 10, 2);
function ba_saving_custom_variation_field($variation_id, $i)
{
    if (isset($_POST['_number_field_variation'][$variation_id])) {
        update_post_meta($variation_id, '_number_field_variation', sanitize_text_field($_POST['_number_field_variation'][$variation_id]));
    }
}

// Adding custom text on product loop for the custom fee
add_action('woocommerce_after_shop_loop_item', 'ba_display_custom_product_text_loop', 9);
function ba_display_custom_product_text_loop()
{
    global $product;

    // Getting the corresponding product custom field value
    $item_fee = get_post_meta($product->get_id(), '_number_field', true);

    // Getting the currency symbol
    $currency_symbol = get_woocommerce_currency_symbol();

    // Displaying custom text if fee is set
    if ($item_fee) {
        echo '<p style="margin-top: 10px; color: red;">You pay ' . $item_fee . ' ' . $currency_symbol . ' warranty for this product.</p>';
    }
}

该代码允许我为简单和可变产品（包括变体）添加费用。税金总额显示在购物车和结帐中。在商店和产品页面上，会显示每件商品的费用金额。如何使可变产品显示所选变体的费用？ 我尝试使用 用选定的变体描述替换 WooCommerce 产品简短描述答案，但我没有设法使其发挥作用。

Answer 1

自 WooCommerce 3 以来，您的代码有点过时，有一些错误。我已经完全修改了您的代码，添加了缺少的代码以显示所选变体保修费。

// add an input number field to Admin Product edit pages
add_action('woocommerce_product_options_general_product_data', 'add_admin_product_warranty_fee_field');
function add_admin_product_warranty_fee_field() {
    echo '<div class="options_group">';

    woocommerce_wp_text_input( array(
        'id'                => '_warranty_fee',
        'type'              => 'number',
        'label'             => __('Environmental fee', 'woocommerce'),
        'placeholder'       => '',
        'description'       => __('Enter the custom value here.', 'woocommerce'),
        'desc_tip'          => 'true',
        'custom_attributes' => array( 'step' => 'any', 'min' => '0' )
    ) );

    echo '</div>';
}

// Save input number field value from product edit page
add_action('woocommerce_admin_process_product_object', 'save_admin_product_warranty_fee_field_value');
function save_admin_product_warranty_fee_field_value( $product ) {
    $product->update_meta_data('_warranty_fee', isset($_POST['_warranty_fee']) ? esc_attr($_POST['_warranty_fee']) : '');
}

// add an input number field to Admin product variations settings
add_action('woocommerce_variation_options_pricing', 'add_admin_variation_warranty_fee_field', 10, 3);
function add_admin_variation_warranty_fee_field($loop, $variation_data, $variation) {    
    $variation_object = wc_get_product($variation->ID);

    echo '<div class="custom-variation-field">';

    woocommerce_wp_text_input(array(
        'id'                => "_warranty_fee[{$loop}]",
        'type'              => 'number',
        'label'             => __('Environmental fee', 'woocommerce'),
        'placeholder'       => '',
        'description'       => __('Enter the custom value here.', 'woocommerce'),
        'desc_tip'          => 'true',
        'wrapper_class'     => 'form-row form-row-wide',
        'custom_attributes' => array( 'step' => 'any', 'min' => '0' ),
        'value'             => $variation_object->get_meta('_warranty_fee'),
    ));

    echo '</div>';
}

// Save input number field value from product variation settings
add_action( 'woocommerce_admin_process_variation_object', 'save_admin_variation_custom_fields', 10, 2 );
function save_admin_variation_custom_fields( $variation, $i ) {
    $variation->update_meta_data('_warranty_fee', isset($_POST['_warranty_fee'][$i]) ? esc_attr($_POST['_warranty_fee'][$i]) : '');
}

// Add the variation formatted warranty fee price to the form data
add_filter( 'woocommerce_available_variation', 'available_variation_formatted_price_per_unit', 10, 3 );
function available_variation_formatted_price_per_unit( $data, $product, $variation ) {
    if ($item_fee = $variation->get_meta('_warranty_fee')) {
        $data['warranty_fee'] = '<p style="margin-top: 10px; color: red;">' . 
        sprintf( __('You pay %s warranty for this product.', 'woocommerce'), 
        wp_strip_all_tags( wc_price($item_fee) ) ) . '</p>';
    }
    return $data;
}

// Display the selected
add_action( 'woocommerce_after_variations_form', 'variations_form_warranty_fee_js', 10 );
function variations_form_warranty_fee_js() {
    global $product; ?>
    <script>
    jQuery( function($){
        const originalFee = $('.warranty-fee').html()
        $('form.cart').on('show_variation', function(event, data) {
            if ( data.warranty_fee !== undefined ) {
                $('.warranty-fee').html( data.warranty_fee );
            } else {
                $('.warranty-fee').html( originalFee );
            }
        }).on('hide_variation', function(){
            $('.warranty-fee').html( originalFee );
        });
    });
    </script>
    <?php
}

// Display warranty fee on product page
add_action('woocommerce_single_product_summary', 'display_single_product_warranty_fee', 25);
function display_single_product_warranty_fee() {
    global $product;

    echo '<div class="warranty-fee">';

    if ( $item_fee = $product->get_meta('_warranty_fee') ) {
        echo '<p style="margin-top: 10px; color: red;">' . sprintf( 
        __('You pay %s warranty for this product.', 'woocommerce'), 
        wp_strip_all_tags( wc_price($item_fee) ) ) . '</p>';
    }
    echo '</div>';
}

// Adding a custom fee to cart based on a product custom field value calculation
add_action('woocommerce_cart_calculate_fees', 'add_custom_cart_fee');
function add_custom_cart_fee($cart) {
    $fee = 0; // Initializing variables

    // Loop through cart items
    foreach ($cart->get_cart() as $item) {
        $item_fee = $item['data']->get_meta('_warranty_fee');

        if ( $item['variation_id'] > 0 && ! $item_fee ) {
            $parent_product = wc_get_product($item['product_id']);
            $item_fee       = $parent_product->get_meta('_warranty_fee');
        }

        if ( $item_fee > 0 ) {
            $fee += $item['quantity'] * $item_fee;
        }
    }

    // Adding fee to cart if it's not zero
    if ( $fee > 0 ) {
        $cart->add_fee(__('Handling fee', 'woocommerce'), $fee, true, 'standard');
    }
}

代码位于子主题的functions.php 文件中（或插件中）。已测试并有效。

Answer 2

我设法修改了@LoicTheAztec 的代码并使其几乎按照我想要的方式工作。我仍然遇到的问题：如果我没有在产品级别设置附加费（保修）（将该字段留空），则索引中会显示零欧元附加费的消息。为了不显示该消息，我必须在编辑产品时按删除键（尽管没有填写任何内容）。我没有找到任何解决方案来在未填写字段的情况下不显示该文本。此问题仅发生在可变产品上（即使对于那些没有在变体中添加额外费用的产品）。

我的代码：

// add an input number field to Admin product edit pages
add_action('woocommerce_product_options_general_product_data', 'add_admin_product_warranty_fee_field');
function add_admin_product_warranty_fee_field() {
    echo '<div class="options_group">';

    woocommerce_wp_text_input( array(
        'id'                => '_warranty_fee',
        'type'              => 'number',
        'label'             => __('Environmental fee', 'woocommerce'),
        'placeholder'       => '',
        'description'       => __('Enter the custom value here.', 'woocommerce'),
        'desc_tip'          => 'true',
        'custom_attributes' => array( 'step' => 'any', 'min' => '0' )
    ) );

    echo '</div>';
}

// Save input number field value from product edit page
add_action('woocommerce_admin_process_product_object', 'save_admin_product_warranty_fee_field_value');
function save_admin_product_warranty_fee_field_value( $product ) {
    $product->update_meta_data('_warranty_fee', isset($_POST['_warranty_fee']) ? esc_attr($_POST['_warranty_fee']) : '');
}

// add an input number field to Admin product variations settings
add_action('woocommerce_variation_options_pricing', 'add_admin_variation_warranty_fee_field', 10, 3);
function add_admin_variation_warranty_fee_field($loop, $variation_data, $variation) {    
    $variation_object = wc_get_product($variation->ID);
    
    echo '<div class="custom-variation-field">';
    
    // Field for warranty fee
    woocommerce_wp_text_input(array(
        'id'                => "_warranty_fee[{$loop}]",
        'type'              => 'number',
        'label'             => __('Environmental fee', 'woocommerce'),
        'placeholder'       => '',
        'description'       => __('Enter the custom value here.', 'woocommerce'),
        'desc_tip'          => 'true',
        'wrapper_class'     => 'form-row form-row-first',
        'custom_attributes' => array( 'step' => 'any', 'min' => '0' ),
        'value'             => $variation_object->get_meta('_warranty_fee'),
    ));
    
    echo '</div>';
}

// Save input number field value from product variation settings
add_action( 'woocommerce_admin_process_variation_object', 'save_admin_variation_custom_fields', 10, 2 );
function save_admin_variation_custom_fields( $variation, $i ) {
    $variation->update_meta_data('_warranty_fee', isset($_POST['_warranty_fee'][$i]) ? esc_attr($_POST['_warranty_fee'][$i]) : '');
}

// Add the variation formatted warranty fee price to the form data
add_filter( 'woocommerce_available_variation', 'available_variation_formatted_price_per_unit', 10, 3 );
function available_variation_formatted_price_per_unit( $data, $product, $variation ) {
    if ($item_fee = $variation->get_meta('_warranty_fee')) {
        $data['warranty_fee'] = '<p style="margin-top: 10px; color: red;">' . 
        sprintf( __('You pay %s warranty for this product.', 'woocommerce'), 
        wp_strip_all_tags( wc_price($item_fee) ) ) . '</p>';
    }
    return $data;
}

// Display the selected
add_action( 'woocommerce_after_variations_form', 'variations_form_warranty_fee_js', 10 );
function variations_form_warranty_fee_js() {
    global $product; ?>
    <script>
    jQuery( function($){
        const originalFee = $('.warranty-fee').html()
        $('form.cart').on('show_variation', function(event, data) {
            if ( data.warranty_fee !== undefined ) {
                $('.warranty-fee').html( data.warranty_fee );
            } else {
                $('.warranty-fee').html( originalFee );
            }
        }).on('hide_variation', function(){
            $('.warranty-fee').html( originalFee );
        });
    });
    </script>
    <?php
}

// Display warranty fee on product page
add_action('woocommerce_single_product_summary', 'display_single_product_warranty_fee', 25);
function display_single_product_warranty_fee() {
    global $product;

    echo '<div class="warranty-fee">';

    // Check if product is variable and variation is selected
    if ($product->is_type('variable') && ! isset($_REQUEST['variation_id'])) {
        // Do nothing if it's a variable product and no variation is selected
    } else {
        if ($item_fee = $product->get_meta('_warranty_fee')) {
            echo '<p style="margin-top: 10px; color: red;">' . sprintf( 
            __('You pay %s warranty for this product.', 'woocommerce'), 
            wp_strip_all_tags( wc_price($item_fee) ) ) . '</p>';
        }
    }
    echo '</div>';
}

// Adding a custom fee to cart based on a product custom field value calculation
add_action('woocommerce_cart_calculate_fees', 'add_custom_cart_fee');
function add_custom_cart_fee($cart) {
    $fee = 0; // Initializing variables

    // Loop through cart items
    foreach ($cart->get_cart() as $item) {
        $item_fee = $item['data']->get_meta('_warranty_fee');

        if ( $item['variation_id'] > 0 && ! $item_fee ) {
            $parent_product = wc_get_product($item['product_id']);
            $item_fee       = $parent_product->get_meta('_warranty_fee');
        }

        if ( $item_fee > 0 ) {
            $fee += $item['quantity'] * $item_fee;
        }
    }

    // Adding fee to cart if it's not zero
    if ( $fee > 0 ) {
        $cart->add_fee(__('Handling fee', 'woocommerce'), $fee, true, 'standard');
    }
}

// Display warranty fee on shop page
add_filter('woocommerce_loop_add_to_cart_link', 'display_shop_page_warranty_fee', 10, 2);
function display_shop_page_warranty_fee($link, $product) {
    $item_fee = $product->get_meta('_warranty_fee');

    if ($item_fee) {
        $warranty_text = sprintf(__('Warranty: %s', 'woocommerce'), wp_strip_all_tags(wc_price($item_fee)));
        $link = '<span class="warranty-fee-text" style="color: red;">' . $warranty_text . '</span><br/>' . $link;
    }

    return $link;
}