在后端自动填充 WooCommerce 自定义产品设置选择器

Question

关于我之前在Retrieving WC Custom Field 成功回答的问题，我现在有选择字段并且还想添加自动完成的自定义字段（我还没有对此进行研究）

问题： 1.) 如何自动填充自定义选择字段？

//Adding the custom field select
woocommerce_wp_select( 
array( 
'id' => '_select', 
'label' => __( 'SIM Type', 'woocommerce' ), 
'options' => array(
'one' => __( 'Regular', 'woocommerce' ),
'two' => __( 'Nano', 'woocommerce' ),
'three' => __( 'Micro', 'woocommerce' )
)
)
);

//Saving
$woocommerce_select = $_POST['_select'];
if( !empty( $woocommerce_select ) )
update_post_meta( $post_id, '_select', esc_attr( $woocommerce_select ) );

// Display Custom Field Value
echo get_post_meta( $post->ID, '_select', true );

Answer 1

更新：以编程方式在选择字段中设置 <option>：

1) 您需要存储选项键值的关联数组：

// The associative array to store (once)
$options_array = array(
    '' => __( 'Select a value', 'woocommerce' ), // default empty value
    'one' => __( 'Regular', 'woocommerce' ),
    'two' => __( 'Nano', 'woocommerce' ),
    'three' => __( 'Micro', 'woocommerce' )
);

// Serialize the array as a string
$option_str = maybe_serialize( $options_array );

// Save this array in Wordpress options
update_option( 'my_custom_selector_options', $option_str );

2) 获取和反序列化您的选择器选项：

// Get your options select data
$select_options_str = get_option( 'my_custom_selector_options' );

// Unserialize this data:
$select_options_arr = maybe_unserialize( $select_options_str );

// Get the saved  selected 'value' if it exist
$value = get_post_meta( $post->ID, '_select', true );
if( empty( $value ) ) $value = ''; // When 'value' is not defined

// 
woocommerce_wp_select(
    array(
        'id' => '_select',
        'label' => __( 'SIM Type', 'woocommerce' ),
        'options' => $select_options_arr,
        'value' => $value,
    )
);

所以现在您的字段选择器选项已由您从 WordPress 选项中获得的数据填充。

---

要自动填充 woocommerce_wp_select()，您必须以这种方式添加 'value' key：

## 1. The select (dropdown)

// Get the 'value' data if it exist
$value = get_post_meta( $post->ID, '_select', true );
if( empty( $value ) ) $value = ''; // When 'value' is not defined

woocommerce_wp_select(
    array(
        'id' => '_select',
        'label' => __( 'SIM Type', 'woocommerce' ),
        'options' => array(
            '' => __( 'Select a value', 'woocommerce' ), // Added a default empty value
            'one' => __( 'Regular', 'woocommerce' ),
            'two' => __( 'Nano', 'woocommerce' ),
            'three' => __( 'Micro', 'woocommerce' )
        ),
        'value' => $value, // <===  ===  ===  ===  ===  HERE set the 'value' key (autofill)
    )
);

## ---------------------------------

## 2. SAVING

$woocommerce_select = $_POST['_select'];
// The Default empty value is not saved (added in this condition below)
if( !empty( $woocommerce_select ) || $woocommerce_select  != '' ) 
    update_post_meta( $post_id, '_select', esc_attr( $woocommerce_select ) );

快速测试：
要查看它的实际效果，请将 'value' => $value, 替换为 'value' => 'two',
然后选择的值将是：Nano ...