Adding Meta Boxes to Custom Post Type not working

Question

I've tried many things to fix this, I'm fairly new to coding a plugin but I can't seem to get this to work.

I have created a custom post type ("Book") perfectly fine. Now I'm trying to add meta-boxes into it. I can't seem to get the coding to connect to each other properly.

I've tried adding the slugs of each meta box to the "support", I've tried various instances of function and add_meta_box as well as putting different things under "register_meta_box_cb" and nothing I'm doing seems to be working.

Any help is appreciated.

// Register Custom Post Type
function post_type_book() {


    $args = array(
        'label'                 => __( 'book', 'author_station' ),
        'description'           => __( 'Custom Book Entry', 'author_station' ),
        'supports'              => array('title'),
        'taxonomies'            => array( 'genres', 'series', 'tags' ),
         'register_meta_box_cb' => ('as_add_book' ),
        'labels'                => $labels,
        'hierarchical'          => false,
        'public'                => true,
        'show_ui'               => true,
        'show_in_menu'          => false,
        'menu_position'         => 20,
        'show_in_admin_bar'     => true,
        'show_in_nav_menus'     => true,
        'can_export'            => true,
        'has_archive'           => true,
        'exclude_from_search'   => false,
        'publicly_queryable'    => true,
         'rewrite' => array('slug' => 'Book'),
        'capability_type'       => 'page',

    );
    register_post_type( 'as_book', $args );

}

function as_add_book( $meta_boxes ) {
    add_meta_box(
        'add_meta_boxes',
        array( $this, 'as_add_book_boxes' ));

     $types = array('post', 'page', 'book');

   if (in_array($types)) {
      add_meta_box(
        'as_add_book',
        'add_meta_boxes',
        'Book',
        'as_add_book_callback',
        $types,
        'normal',
        'high'
      );

   }
    $prefix = 'as_';


    $meta_boxes[] = array(
        'id' => 'as_add_book',
        'title' => esc_html__( 'Book', 'author_station_book' ),
        'pages'=> array('as_book'),
        'context' => 'advanced',
        'priority' => 'high',
        'autosave' => 'false',
        'fields' => array(
            array(
                'id' => $prefix . 'book_cover',
                'type' => 'image',
                'name' => esc_html__( 'Book Cover', 'author_station_book' ),
            ),
            array(
                'id' => $prefix . 'book_title',
                'type' => 'text',
                'name' => esc_html__( 'Title', 'author_station_book' ),
            ),

    );

    return $meta_boxes;
}
add_filter( 'rwmb_meta_boxes', 'as_add_book' );

aqib luqmaan aqib luqmaan · Accepted Answer · 2020-05-16T20:57:49

add_action( 'add_meta_boxes', 'my_custom_meta_box' ) );
function my_custom_meta_box(){

  $args = array();

  add_meta_box(
    'my_metabox_id',
    __( 'My Meta Box', 'my_textdomain' ), // Title
    'my_callback_function',               // Callback function that renders the content of the meta box
    'post',                               // Admin page (or post type) to show the meta box on
    'side',                               // Context where the box is shown on the page
    'high',                               // Priority within that context
    $args                                 // Arguments to pass the callback function, if any
  );
}


function my_callback_function( $args ){

  //The markup for your meta box goes here

}

Adding Meta Boxes to Custom Post Type not working

1 Answers