Display a custom field under short description in Woocommerce single product pages

Question

In woocommerce I am using some code to add a Metabox with a custom field in product edit pages.

How can I display the value of this custom field under short description in single product pages?

Here is my code:

add_action ('add_meta_boxes','add_info_meta_box');
function add_info_meta_box()
{
    add_meta_box('new_meta', 'info','info_meta_fields_output','product', 'side');
}


function info_meta_fields_output($post)
{
    $new_meta = get_post_meta($post->ID,'_new_meta',true);
    echo ('<label for="new_meta"> Custom Text </label>');
    echo ('<input type="text" id="new_meta" name="new_meta" value="'.esc_attr($new_meta).'"/>');
}

add_action('save_post','save_info_meta_box');
function save_info_meta_box($post_id)
{
    $new_meta=sanitize_text_field($_POST['new_meta']);
    update_post_meta ($post_id,'_new_meta',$new_meta);
}


// Displaying the value on single product pages
function meta_product($product_id) {

    $new_meta2 = get_post_meta(get_the_ID(),'_new_meta', true);
    echo ('<p id="value-on-single-product">' . $new_meta2 . '</p>');
}
add_action('woocommerce_single_product_summary', 'meta_product',30);

But it doesn't display the custom field value.

Answer 1

Updated (added a 2nd custom field as asked in comments)

You should try the following, that will set your custom field in product general tab Metabox and will display this custom field value under product short description:

// Add the custom field
add_action( 'woocommerce_product_options_general_product_data', 'add_custom_field_to_general_product_metabox' );
function add_custom_field_to_general_product_metabox() {
    global $post;

    // Get the selected value
    $value = get_post_meta( $post->ID, '_new_meta', true );
    if( empty( $value ) ) $value = ''; // Default value

    woocommerce_wp_text_input( array(
        'id'       => 'new_meta',
        'label'    => __( 'Thông tin thêm', 'woocommerce' ),
        'placeholder'       => __( '', 'woocommerce' ),
        'description'       => __( '', 'woocommerce' ),
        'value'   => $value, // Displaying the selected value
    ) );


    // Get the selected value
    $value2 = get_post_meta( $post->ID, '_new_meta2', true );
    if( empty( $value2 ) ) $value2 = ''; // Default value

    woocommerce_wp_text_input( array(
        'id'       => 'new_meta2',
        'label'    => __( 'Thông tin thêm', 'woocommerce' ),
        'placeholder'       => __( '', 'woocommerce' ),
        'description'       => __( '', 'woocommerce' ),
        'value'   => $value2, // Displaying the selected value
    ) );
}

// Save the custom field
add_action( 'woocommerce_process_product_meta', 'save_custom_field_to_general_product_metabox' );
function save_custom_field_to_general_product_metabox( $post_id ){

    if( isset( $_POST['new_meta'] ) )
        update_post_meta( $post_id, '_new_meta', esc_attr( $_POST['new_meta'] ) );

    if( isset( $_POST['new_meta2'] ) )
        update_post_meta( $post_id, '_new_meta2', esc_attr( $_POST['new_meta2'] ) );
}


// Displaying the custom field value (on single product pages under short description)
add_action('woocommerce_single_product_summary', 'display_custom_meta_field_value', 25 );
function display_custom_meta_field_value() {
    global $product;

    $custom_field = get_post_meta( $product->get_id(),'_new_meta', true );
    if( ! empty( $custom_field ) )
        echo  '<p id="value-on-single-product">' . $custom_field . '</p>';

    $custom_field2 = get_post_meta( $product->get_id(),'_new_meta2', true );
    if( ! empty( $custom_field2 ) )
        echo '<p id="value-on-single-product">' . $custom_field2 . '</p>';
}

Code goes in function.php file of your active child theme (or active theme).

Tested and works.