WordPress的meta-box不保存和更新

function wporg_add_custom_box(){ $screens = ['product', 'wporg_cpt']; foreach ($screens as $screen) { add_meta_box( 'wporg_box_id', // Unique ID 'Select a Authors Name ', // Box title 'wporg_custom_box_html', // Content callback, must be of type callable $screen// Post type ); } } add_action('edit_form_after_title', 'wporg_add_custom_box'); function wporg_custom_box_html($post){ $value = http://www.srcmini.com/get_post_meta($post-> ID,'_getwriter_id', true); ?> < select name="book_writer_id" id="book_writer_id" class="postbox"> < ?php $type = 'book_authors'; // your post type $args=array( 'post_type' => $type, 'post_status' => 'publish', 'posts_per_page' => -1, 'caller_get_posts'=> 1 ); $my_query = null; $my_query = new WP_Query($args); if( $my_query-> have_posts() ) { while ($my_query-> have_posts()) : $my_query-> the_post(); $id = get_the_ID(); ?> < option value="http://www.srcmini.com/< ?=$id; ?>" < ?php selected($value, $id); ?> > < ?=the_title(); ?> < /option> < ?php endwhile; } wp_reset_query(); // Restore global post data stomped by the_post(). ?> < /select> < ?php } function wporg_save_postdata($post_id) { if (array_key_exists('book_writer_id', $_POST)) { update_post_meta( $post_id, '_getwriter_id', $_POST['book_writer_id'] ); } } add_action('save_post', 'wporg_save_postdata');

#1【WordPress的meta-box不保存和更新】我没有在那里使用save_postdate函数, 为什么, 它不保存值和更新数据

function wporg_add_custom_box(){ $screens = ['product', 'wporg_cpt']; foreach ($screens as $screen) { add_meta_box( 'wporg_box_id', // Unique ID 'Select a Authors Name ', // Box title 'wporg_custom_box_html', // Content callback, must be of type callable $screen// Post type ); } } add_action('edit_form_after_title', 'wporg_add_custom_box'); function wporg_custom_box_html($post) { $value = http://www.srcmini.com/get_post_meta($post-> ID,'_getwriter_id', true); ?> < select name="book_writer_id" id="book_writer_id" class="postbox"> < ?php $type = 'book_authors'; // your post type $args=array( 'post_type' => $type, 'post_status' => 'publish', 'posts_per_page' => -1, 'caller_get_posts'=> 1 ); $my_query = null; $my_query = new WP_Query($args); if( $my_query-> have_posts() ) { while ($my_query-> have_posts()) : $my_query-> the_post(); $id = get_the_ID(); ?> < option value="http://www.srcmini.com/< ?=$id; ?>" < ?php selected($value, $id); ?> > < ?=the_title(); ?> < /option> < ?php endwhile; } wp_reset_query(); // Restore global post data stomped by the_post(). ?> < /select> < ?php }function wporg_save_postdata($post_id) { if (array_key_exists('book_writer_id', $_POST)) { update_post_meta( $post_id, '_getwriter_id', $_POST['book_writer_id'] ); } } add_action('save_post', 'wporg_save_postdata');