WooCommerce：添加/显示产品或变化自定义字段无处不在

Question

目前正在使用WordPress 5.1.1和WooCommerce 3.5.7。我的WooCommerce商店有大约500种产品，由简单和多变的产品组成。

每个产品自然都有一个SKU，但每个产品也有一个称为“商品代码”的唯一ID代码。我向特定行业销售特定产品。

我已经在我的functions.php文件中添加了简单和可变产品的自定义字段的代码，目前效果很好。

我的问题是，我试图让“商品代码”出现在购物车、退房、发票和电子邮件的产品标题下。

我在网上阅读了各种教程来帮助我，但我并不知道，因为每个教程都以不同的方式做类似的事情。大多数教程假设用户已经通过前端输入了数据，但我的数据是预设的。

我用来帮助我的教程是：

• https://businessbloomer.com/woocommerce-add-custom-field-product-variation/
• https://www.liquidweb.com/blog/custom-fields-woocommerce-products/
• https://www.tychesoftwares.com/how-to-add-custom-fields-to-woocommerce-products-subsequently-through-the-order-cycle/

<?php
// Add WooCommerce Custom Field for Commodity Code
function vp_add_commodity_code() {
  $args = array(
    'id' => 'vp_commodity_code',
    'label' => __( 'Commodity Code', 'woocommerce' ),
    'placeholder' => __( 'Enter Commodity Code here', 'woocommerce' ),
    'desc_tip' => true,
    'description' => __( 'This field is for the Commodity Code of the product.', 'woocommerce' ),
  );
  woocommerce_wp_text_input( $args );
}
add_action( 'woocommerce_product_options_sku', 'vp_add_commodity_code' );


// Save Commodity Code into WooCommerce Database
function vp_save_commodity_code( $post_id ) {
  // grab the Commodity Code
  $sku = isset( $_POST[ 'vp_commodity_code' ] ) ? sanitize_text_field( $_POST[ 'vp_commodity_code' ] ) : '';

  // grab the product
  $product = wc_get_product( $post_id );

  // save the Commodity Code custom field
  $product->update_meta_data( 'vp_commodity_code', $sku );
  $product->save();
}
add_action( 'woocommerce_process_product_meta', 'vp_save_commodity_code' );

// Display Commodity Code on the Frontend
function vp_display_commodity_code() {
    global $post;
    // Check for the Commodity Code value
    $product = wc_get_product( $post->ID );
    $title = $product->get_meta( 'vp_commodity_code' );
    if( $title ) {
    // Only display the field if we've got a value for the field title
    printf(
    '<div class="vpcommoditycode-wrapper"><strong>Commodity Code: </strong>%s</div>',
    esc_html( $title )
    );
    }
   }
   add_action( 'woocommerce_before_add_to_cart_button', 'vp_display_commodity_code' );


// Add custom field input @ Product Data > Variations > Single Variation

add_action( 'woocommerce_variation_options_pricing', 'comcode_add_custom_field_to_variations', 10, 3 ); 

function comcode_add_custom_field_to_variations( $loop, $variation_data, $variation ) {
woocommerce_wp_text_input( array(
    'id' => 'custom_field[' . $loop . ']',
    'class' => 'short',
    'label' => __( 'Community Code', 'woocommerce' ),
    'value' => get_post_meta( $variation->ID, 'custom_field', true ),
    'placeholder' => __( 'Enter Commodity Code here', 'woocommerce' ),
    'desc_tip' => true,
    'description' => __( 'This field is for the Commodity Code of the product.', 'woocommerce' ),
)
);
}

// Save custom field on product variation

add_action( 'woocommerce_save_product_variation', 'comcode_save_custom_field_variations', 10, 2 );

function comcode_save_custom_field_variations( $variation_id, $i ) {
$custom_field = $_POST['custom_field'][$i];
if ( isset( $custom_field ) ) update_post_meta( $variation_id, 'custom_field', esc_attr( $custom_field ) );
}

// Store custom field value into variation data

add_filter( 'woocommerce_available_variation', 'comcode_add_custom_field_variation_data' );

function comcode_add_custom_field_variation_data( $variations ) {
$variations['custom_field'] = '<div class="woocommerce_custom_field"><strong>Commodity Code: </strong><span>' . get_post_meta( $variations[ 'variation_id' ], 'custom_field', true ) . '</span></div>';
return $variations;
}
?>

可以某种PHP/WooCommerce天才帮助我在这里请提供代码或指向我的教程，将帮助我或名称的第三方WordPress插件，将这样做。

Answer 1

我已经重新访问并完成了您现有的代码，例如，它不适用于产品变化...这将：

• 在库存选项卡下的管理产品上显示自定义字段
• 在管理产品的变化选项卡下为每个变化显示自定义字段
• 保存产品和产品变化的自定义字段值
• 在单个产品页面上显示自定义字段值（也为每个选定的变化）
• 在购物车和结账页面上显示自定义字段值
• 将自定义字段值保存为订单项元数据
• 在管理订单上显示自定义字段值
• 在订单和电子邮件通知上显示自定义字段

代码：

// Admin: Add custom field
add_action('woocommerce_product_options_sku', 'vp_add_commodity_code' );
function vp_add_commodity_code(){

    woocommerce_wp_text_input( array(
        'id'          => '_commodity_code',
        'label'       => __('Commodity Code', 'woocommerce' ),
        'placeholder' => __('Enter Commodity Code here', 'woocommerce' ),
        'desc_tip'    => true,
        'description' => __('This field is for the Commodity Code of the product.', 'woocommerce' ),
    ) );
}

// Admin: Save custom field value for simple product inventory options
add_action('woocommerce_admin_process_product_object', 'vp_product_save_commodity_code', 10, 1 );
function vp_product_save_commodity_code( $product ){
    if( isset($_POST['_commodity_code']) )
        $product->update_meta_data( '_commodity_code', sanitize_text_field($_POST['_commodity_code']) );
}

// Admin: Add custom field in product variations options pricing
add_action( 'woocommerce_variation_options_pricing', 'vp_add_variation_commodity_code', 10, 3 );
function vp_add_variation_commodity_code( $loop, $variation_data, $variation ){

   woocommerce_wp_text_input( array(
        'id'          => '_commodity_code['.$loop.']',
        'label'       => __('Commodity Code', 'woocommerce' ),
        'placeholder' => __('Enter Commodity Code here', 'woocommerce' ),
        'desc_tip'    => true,
        'description' => __('This field is for the Commodity Code of the product.', 'woocommerce' ),
        'value'       => get_post_meta( $variation->ID, '_commodity_code', true )
    ) );
}

// Admin: Save custom field value from product variations options pricing
add_action( 'woocommerce_save_product_variation', 'save_barcode_variations', 10, 2 );
function save_barcode_variations( $variation_id, $i ){
    if( isset($_POST['_commodity_code'][$i]) ){
        update_post_meta( $variation_id, '_commodity_code', sanitize_text_field($_POST['_commodity_code'][$i]) );
    }
}

// Frontend: Display Commodity Code on product
add_action( 'woocommerce_before_add_to_cart_button', 'vp_product_display_commodity_code' );
function vp_product_display_commodity_code() {
    global $product;

    if( $value = $product->get_meta( '_commodity_code' ) ) {
        echo '<div class="vp-ccode-wrapper"><strong>' . __("Commodity Code", "woocommerce") .
        ': </strong>'.esc_html( $value ).'</div>';
    }
}

// Frontend: Display Commodity Code on product variations
add_filter( 'woocommerce_available_variation', 'vp_variation_display_commodity_code', 10, 3 );
function vp_variation_display_commodity_code( $data, $product, $variation ) {

    if( $value = $variation->get_meta( '_commodity_code' ) ) {
        $data['price_html'] .= '<p class="vp-ccode"><small><strong>' . __("Commodity Code", "woocommerce") .
        ': </strong>'.esc_html( $value ).'</small></p>';
    }

    return $data;
}

// Frontend: Display Commodity Code on cart
add_filter( 'woocommerce_cart_item_name', 'vp_cart_display_commodity_code', 10, 3 );
function vp_cart_display_commodity_code( $item_name, $cart_item, $cart_item_key ) {
    if( ! is_cart() )
        return $item_name;

    if( $value = $cart_item['data']->get_meta('_commodity_code') ) {
        $item_name .= '<br><small class="vp-ccode"><strong>' . __("Commodity Code", "woocommerce") .
            ':</strong> ' . esc_html( $value ) . '</small>';
    }
    return $item_name;
}

// Frontend: Display Commodity Code on checkout
add_filter( 'woocommerce_checkout_cart_item_quantity', 'vp_checkout_display_commodity_code', 10, 3 );
function vp_checkout_display_commodity_code( $item_qty, $cart_item, $cart_item_key ) {
    if( $value = $cart_item['data']->get_meta('_commodity_code') ) {
        $item_qty .= '<br><small class="vp-ccode"><strong>' . __("Commodity Code", "woocommerce") .
            ':</strong> ' . esc_html( $value ) . '</small>';
    }
    return $item_qty;
}

// Save Commodity Code to order items (and display it on admin orders)
add_filter( 'woocommerce_checkout_create_order_line_item', 'vp_order_item_save_commodity_code', 10, 4 );
function vp_order_item_save_commodity_code( $item, $cart_item_key, $cart_item, $order ) {
    if( $value = $cart_item['data']->get_meta('_commodity_code') ) {
        $item->update_meta_data( '_commodity_code', esc_attr( $value ) );
    }
    return $item_qty;
}

// Frontend & emails: Display Commodity Code on orders
add_action( 'woocommerce_order_item_meta_start', 'vp_order_item_display_commodity_code', 10, 4 );
function vp_order_item_display_commodity_code( $item_id, $item, $order, $plain_text ) {
    // Not on admin
    //if( is_admin() ) return;

    if( $value = $item->get_meta('_commodity_code') ) {
        $value = '<strong>' . __("Commodity Code", "woocommerce") . ':</strong> ' . esc_attr( $value );

        // On orders
        if( is_wc_endpoint_url() )
            echo '<div class="vp-ccode"><small>' . $value . '</small></div>';
        // On Emails
        else
            echo '<div style="font-size:11px;padding-top:6px">' . $value . '</div>';
    }
}

代码进入活动子主题（或活动主题）的function.php文件。测试和工作。