<?php
function wporg_add_custom_box() {
$screens = [ 'post', 'wporg_cpt' ];
foreach ( $screens as $screen ) {
add_meta_box(
'wporg_box_id', // Unique ID
'Custom Meta Box Title', // Box title
'wporg_custom_box_html', // Content callback, must be of type callable
$screen // Post type
);
}
}
add_action( 'add_meta_boxes', 'wporg_add_custom_box' );
function wporg_custom_box_html( $post ) {
$value = get_post_meta( $post->ID, '_wporg_meta_key', true );
?>
<label for="wporg_field">Description for this field</label>
<select name="wporg_field" id="wporg_field" class="postbox">
<option value="">Select something...</option>
<option value="aaaaaaaaaaagggggggggghhhhhhhhhh" <?php selected( $value, 'aaaaaaaaaaagggggggggghhhhhhhhhh' ); ?>>aaaaaaaaaaagggggggggghhhhhhhhhh</option>
<option value="else" <?php selected( $value, 'else' ); ?>>Else</option>
</select>
<?php
}
function wporg_save_postdata( $post_id ) {
if ( array_key_exists( 'wporg_field', $_POST ) ) {
update_post_meta(
$post_id,
'_wporg_meta_key',
$_POST['wporg_field']
);
}
}
add_action( 'save_post', 'wporg_save_postdata' );
function wporg_meta_box_scripts() {
// Get current admin screen, or null.
$screen = get_current_screen();
// Verify admin screen object before use.
if ( is_object( $screen ) ) {
// Enqueue only for specific post types.
if ( in_array( $screen->post_type, [ 'post', 'wporg_cpt' ], true ) ) {
wp_enqueue_script( 'wporg_meta_box_script', plugin_dir_url( __FILE__ ) . 'admin/meta-boxes/js/admin.js', [ 'jquery' ], '1.0.0', true );
wp_localize_script(
'wporg_meta_box_script',
'wporg_meta_box_obj',
[
'url' => admin_url( 'admin-ajax.php' ),
]
);
}
}
}
add_action( 'admin_enqueue_scripts', 'wporg_meta_box_scripts' );
?>
