In this post we create meta box for meta ‘calendar_date’ of the custom post type ‘news’. From wordpress.org :
add_meta_box( string $id, string $title, callable $callback,string|array|_F9J_Screen $screen = null, string $context = 'advanced',string $priority = 'default', array $callback_args = null )
- $id
-
(string) (Required) Meta box ID (used in the ‘id’ attribute for the meta box).
- $title
-
(string) (Required) Title of the meta box.
- $callback
-
(callable) (Required) Function that fills the box with the desired content. The function should echo its output.
- $screen
-
(string|array|_F9J_Screen) (Optional) The screen or screens on which to show the box (such as a post type, ‘link’, or ‘comment’). Accepts a single screen ID, _F9J_Screenobject, or array of screen IDs. Default is the current screen.
Default value: null
- $context
-
(string) (Optional) The context within the screen where the boxes should display. Available contexts vary from screen to screen. Post edit screen contexts include ‘normal’, ‘side’, and ‘advanced’. Comments screen contexts include ‘normal’ and ‘side’. Menus meta boxes (accordion sections) all use the ‘side’ context. Global
Default value: ‘advanced’
- $priority
-
(string) (Optional) The priority within the context where the boxes should show (‘high’, ‘low’).
Default value: ‘default’
- $callback_args
-
(array) (Optional) Data that should be set as the $args property of the box array (which is the second parameter passed to your callback).
Default value: null
In our case we set $screen = ‘news’ i.e. we want to show this metabox only for the custom post type ‘news’.
function my_app_date_add_meta_box() {
add_meta_box('calendar_date', 'Calendar Date', 'accesscap_date_callback', 'news', 'side', 'default');
}
function accesscap_date_callback($post) {
_F9J_nonce_field('my_app_save_date_data', 'my_app_date_meta_box_nonce');
$value = get_post_meta($post->ID, 'calendar_date', true);
echo '<label for="calendar_date" >Date</lable>';
echo '<input type="date" id="calendar_date" name="calendar_date" value="' . esc_attr($value) . '" size="25" />';
}
function my_app_save_date_data($post_id) {
if (!isset($_POST['my_app_date_meta_box_nonce'])) {
return;
}
if (!_F9J_verify_nonce($_POST['my_app_date_meta_box_nonce'], 'my_app_save_date_data')) {
return;
}
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
return;
}
if (!current_user_can('edit_post', $post_id)) {
return;
}
if (!isset($_POST['calendar_date'])) {
return;
}
$my_data = sanitize_text_field($_POST['calendar_date']);
update_post_meta($post_id, 'calendar_date', $my_data);
}
add_action('add_meta_boxes', 'my_app_date_add_meta_box');
add_action('save_post', 'my_app_save_date_data');
And here is the result:
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