WordPress窗口小部件未显示在(AdminPanel)上

我试图使小部件显示某些内容, 但未在admin-> appearance部分显示。下面的代码我写在functions.php文件下面的功能正在工作, 除了小部件。像菜单, 图标, 工作正常, 我累了要制作小部件。在座的任何人都可以帮助我。并预先感谢。

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< ?phpclass jpen_Category_List_Widget extends WP_Widget {// php classnames and widget name/description addedfunction __construct() {$widget_options = array('classname' => 'jpen_category_list_widget', 'description' => 'Add a nicely formatted list of categories to your sidebar.'); parent::__construct( 'jpen_category_list_widget', 'Simple Blog Theme Category List', $widget_options ); }// create the widget outputfunction widget( $args, $instance ) {$title = apply_filters( 'widget_title', $instance[ 'title' ] ); $categories = get_categories( array('orderby' => 'name', 'order'=> 'ASC') ); $cat_count = 0; $cat_col_one = []; $cat_col_two = []; foreach( $categories as $category ) {$cat_count ++; $category_link = sprintf( '< li class="list-unstyled"> < a href="http://www.srcmini.com/%1$s" alt="%2$s"> %3$s< /a> < /li> ', esc_url( get_category_link( $category-> term_id ) ), esc_attr( sprintf( __( 'View all posts in %s', 'textdomain' ), $category-> name ) ), esc_html( $category-> name )); if ($cat_count % 2 != 0 ) {$cat_col_one[] = $category_link; } else {$cat_col_two[] = $category_link; }}echo $args['before_widget'] . $args['before_title'] . $title . $args['after_title']; ?> < div class="row"> < div class="col-lg-6"> < ?phpforeach( $cat_col_one as $cat_one ) {echo $cat_one; } ?> < /div> < div class="col-lg-6"> < ?php foreach( $cat_col_two as $cat_two ) {echo $cat_two; } ?> < /div> < /div> < ?phpecho $args['after_widget']; }function form( $instance ) { $title = ! empty( $instance['title'] ) ? $instance['title'] : ''; ?> < p> < label for="< ?php echo $this-> get_field_id( 'title' ); ?> "> Title:< /label> < input type="text" id="< ?php echo $this-> get_field_id( 'title' ); ?> " name="< ?php echo $this-> get_field_name( 'title' ); ?> " value="http://www.srcmini.com/< ?php echo esc_attr( $title ); ?>" /> < /p> < p> This widget displays all of your post categories as a two-column list (or a one-column list when rendered responsively).< /p> < ?php }// Update database with new infofunction update( $new_instance, $old_instance ) { $instance = $old_instance; $instance[ 'title' ] = strip_tags( $new_instance[ 'title' ] ); return $instance; }}// register the widgetfunction jpen_register_widgets() { register_widget( 'jpen_Category_List_Widget' ); }add_action( 'widgets_init', 'jpen_register_widgets' ); ////////////////////add_theme_support('menu'); function register_newtheme_menu(){register_nav_menus(array('main-menu'=> _('Main Menu'))); }add_action('init', 'register_newtheme_menu'); function add_menuclass($ulclass) {return preg_replace('/< a /', '< a class="navigation-link w-nav-link" ', $ulclass); }add_filter('wp_nav_menu', 'add_menuclass'); function theme_prefix_setup() { add_theme_support( 'custom-logo', array('height'=> 100, 'width'=> 400, 'flex-width' => true, ) ); }add_action( 'after_setup_theme', 'theme_prefix_setup' ); ?>

#1 纳德姆
仅在该小部件菜单出现在管理面板区域中之后, 才需要在functions.php文件中添加register_sidebar。
有关更多信息, 你可以访问下面的链接。 https://codex.wordpress.org/Function_Reference/register_sidebar
例如将下面的代码粘贴到你的functions.php文件中

function customtheme_widgets_init() { register_sidebar( array( 'name'=> __( 'Sidebar', 'customtheme' ), 'id'=> 'sidebar-1', 'description'=> __( 'Add widgets here to appear in your sidebar.', 'customtheme' ), 'before_widget' => '< section id="%1$s" class="widget %2$s"> ', 'after_widget'=> '< /section> ', 'before_title'=> '< h2 class="widget-title"> ', 'after_title'=> '< /h2> ', ) ); add_action( 'widgets_init', 'customtheme_widgets_init' );

【WordPress窗口小部件未显示在(AdminPanel)上】希望对你有帮助。