Wordpress WP插件选项页面-输入字段注册

我尝试为我的WP插件创建一个选项页面来编辑插件设置。。。 以wordpress.org上的一些示例代码为例，到目前为止，它在选择字段（'Diaspora'、'Dislater'）上运行良好

但我无法让输入文本字段（“localecode”）以相同的方式工作（请参见代码）

我做错了什么？如何以自动预注册默认值（'de_de.UTF8'）的相同方式显示输入字段

<?php
/**
 * custom option and settings
 */
function wpj_settings_init() {
    // Register a new setting for "wpj" page.
    register_setting( 'wpj', 'wpj_options' );
 
    // Register a new section in the "wpj" page.
    add_settings_section(
        'wpj_section_developers',
        __( 'Basic Configuration', 'wpj' ), 'wpj_section_developers_callback',
        'wpj'
    );
 
    // Register fields in the "wpj_section_developers" section, inside the "wpj" page.
       add_settings_field(
        'wpj_field_localecode', // As of WP 4.6 this value is used only internally.
                                // Use $args' label_for to populate the id inside the callback.
            __( 'Locale Code', 'wpj' ),
        'wpj_field_localcode_cb',
        'wpj',
        'wpj_section_developers',
        array(
            'label_for'         => 'wpj_field_localecode',
            'class'             => 'wpj_row',
            'wpj_custom_data' => 'custom',
        )
    );
    
    add_settings_field(
        'wpj_field_diaspora', // As of WP 4.6 this value is used only internally.
                                // Use $args' label_for to populate the id inside the callback.
            __( 'Diaspora', 'wpj' ),
        'wpj_field_diaspora_cb',
        'wpj',
        'wpj_section_developers',
        array(
            'label_for'         => 'wpj_field_diaspora',
            'class'             => 'wpj_row',
            'wpj_custom_data' => 'custom',
        )
    );
    add_settings_field(
        'wpj_field_postpone', // As of WP 4.6 this value is used only internally.
                                // Use $args' label_for to populate the id inside the callback.
            __( 'Postpone Holidays', 'wpj' ),
        'wpj_field_postpone_cb',
        'wpj',
        'wpj_section_developers',
        array(
            'label_for'         => 'wpj_field_postpone',
            'class'             => 'wpj_row',
            'wpj_custom_data' => 'custom',
        )
    );

}
 
/**
 * Register wpj_settings_init to the admin_init action hook.
 */
add_action( 'admin_init', 'wpj_settings_init' );
 
 
/**
 * Custom option and settings:
 *  - callback functions
 */
 
 
/**
 * Developers section callback function.
 *
 * @param array $args  The settings array, defining title, id, callback.
 */
function wpj_section_developers_callback( $args ) {
    ?>
    <p id="<?php echo esc_attr( $args['id'] ); ?>"><?php esc_html_e( 'Edit your basic plugin settings here:', 'wpj' ); ?></p>
    <?php
}

/**
 * Locale code field callback function.
 */
function wpj_field_localecode_cb( $args ) {
    // Get the value of the setting we've registered with register_setting()
    $options = get_option( 'wpj_options' );
    ?>
<input
id="<?php echo esc_attr( $args['label_for'] ); ?>"
name="wpj_options[<?php echo esc_attr( $args['label_for'] ); ?>]"
data-custom="<?php echo esc_attr( $args['wpj_custom_data'] ); ?>"
size="8" type="text" value="de_DE.UTF8" />
<p class="description">
        <?php esc_html_e( 'Edit your country locale (this affects the language of weekday and month names).', 'wpj' ); ?>
    </p>
    <?php
}


/**
 * Diaspora field callback function.
 */
function wpj_field_diaspora_cb( $args ) {
    // Get the value of the setting we've registered with register_setting()
    $options = get_option( 'wpj_options' );
    ?>
    <select
            id="<?php echo esc_attr( $args['label_for'] ); ?>"
            data-custom="<?php echo esc_attr( $args['wpj_custom_data'] ); ?>"
            name="wpj_options[<?php echo esc_attr( $args['label_for'] ); ?>]">
        <option value="true" <?php echo isset( $options[ $args['label_for'] ] ) ? ( selected( $options[ $args['label_for'] ], 'true', false ) ) : ( '' ); ?>>
            <?php esc_html_e( 'Yes', 'wpj' ); ?>
        </option>
        <option value="false" <?php echo isset( $options[ $args['label_for'] ] ) ? ( selected( $options[ $args['label_for'] ], 'false', false ) ) : ( '' ); ?>>
            <?php esc_html_e( 'No', 'wpj' ); ?>
        </option>
    </select>
    <p class="description">
        <?php esc_html_e( 'Select "Yes" if you live in Galut, outside Israel or "No" if you live at Eretz Israel (this affects the durarion of some holidays).', 'wpj' ); ?>
    </p>
    <?php
}
/**
 * Postpone on Saturday field callback function.
 */
function wpj_field_postpone_cb( $args ) {
    // Get the value of the setting we've registered with register_setting()
    $options = get_option( 'wpj_options' );
    ?>
    <select
            id="<?php echo esc_attr( $args['label_for'] ); ?>"
            data-custom="<?php echo esc_attr( $args['wpj_custom_data'] ); ?>"
            name="wpj_options[<?php echo esc_attr( $args['label_for'] ); ?>]">
        <option value="true" <?php echo isset( $options[ $args['label_for'] ] ) ? ( selected( $options[ $args['label_for'] ], 'true', false ) ) : ( '' ); ?>>
            <?php esc_html_e( 'Yes', 'wpj' ); ?>
        </option>
        <option value="false" <?php echo isset( $options[ $args['label_for'] ] ) ? ( selected( $options[ $args['label_for'] ], 'false', false ) ) : ( '' ); ?>>
            <?php esc_html_e( 'No', 'wpj' ); ?>
        </option>
    </select>
    <p class="description">
        <?php esc_html_e( 'Postbone holiday if it falls on a saturday.', 'wpj' ); ?>
    </p>
    <?php
}
 
/**
 * Add the top level menu page.
 */
function wpj_options_page() {
    add_menu_page(
        'WP Jewify It',
        'WP Jewify It Options',
        'manage_options',
        'wpj',
        'wpj_options_page_html'
    );
}
 
 
/**
 * Register our wpj_options_page to the admin_menu action hook.
 */
add_action( 'admin_menu', 'wpj_options_page' );
 
 
/**
 * Top level menu callback function
 */
function wpj_options_page_html() {
    // check user capabilities
    if ( ! current_user_can( 'manage_options' ) ) {
        return;
    }
 
    // add error/update messages
 
    // check if the user have submitted the settings
    // WordPress will add the "settings-updated" $_GET parameter to the url
    if ( isset( $_GET['settings-updated'] ) ) {
        // add settings saved message with the class of "updated"
        add_settings_error( 'wpj_messages', 'wpj_message', __( 'Settings Saved', 'wpj' ), 'updated' );
    }
 
    // show error/update messages
    settings_errors( 'wpj_messages' );
    ?>
    <div class="wrap">
        <h1><?php echo esc_html( get_admin_page_title() ); ?></h1>
        <form action="options.php" method="post">
            <?php
            // output security fields for the registered setting "wpj"
            settings_fields( 'wpj' );
            // output setting sections and their fields
            // (sections are registered for "wpj", each field is registered to a specific section)
            do_settings_sections( 'wpj' );
            // output save settings button
            submit_button( 'Save Settings' );
            ?>
        </form>
    </div>
    <?php
}