CMB2

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Box Properties ​

When registering a CMB2 metabox/instance, you will pass an array of properties to the new_cmb2_box() function. The possible properties in that array are documented here.

id ​

The id of metabox

'id' => 'my-metabox',


title ​

Metabox title. Title display in the admin metabox. Default is ''.

To keep from registering an actual post-screen metabox, omit the 'title' property from the metabox registration array. (WordPress will not display metaboxes without titles anyway)

This is a good solution if you want to handle outputting your metaboxes/fields elsewhere in the post-screen.

'title' => 'Title of the Metabox',


object_types ​

An array containing post type slugs, or 'user', 'term', 'comment', or 'options-page'. This property is required to have a value.

'object_types' => array( 'page' ),


context ​

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'. (More Info)

For placement in locations outside of a metabox (but in the post/custom-post-type screen), other options include: 'form_top', 'before_permalink', 'after_title', 'after_editor' (More Information) For these alternate locations, if it is preferred that the fields are output without the metabox, then omit the 'title' property from the metabox registration array, and instead add 'remove_box_wrap' => true,.

Comments screen contexts include 'normal' and 'side'. Default is 'normal'.

'context' => 'normal',


priority ​

Priority of the metabox in its context. Default is 'high'. (More Info)

'priority' => 'high',

For the user, term, and options boxes, this priority is used for the hooks used to register the metaboxes. The text version of the priority is converted to an integer. 'high' is converted to 5 (since lower numbers indicate higher hook priorities), 'low' is converted to 20 and all other non-numeric text strings are converted to 10.


show_names ​

Whether to show labels for the fields. Default is true. 'show_names' => false, // Hide the labels


classes ​

This property allows you to optionally add classes to the CMB2 wrapper. This property can take a string, or array.

'classes' => 'additional-class', OR
'classes' => array( 'additional-class', 'another-class' ),


classes_cb ​

Like the classes property, allows adding classes to the CMB2 wrapper, but takes a callback. That callback should return an array of classes. The callback gets passed the CMB2 $properties array as the first argument, and the CMB2 $cmb object as the second argument. Example: 'classes_cb' => 'yourprefix_function_to_add_classes',

php
/**
 * Add classes to the CMB2 wrapper.
 * @param  object $properties The CMB2 box properties.
 * @param  object $cmb        The CMB2 instance.
 */
function yourprefix_function_to_add_classes( $properties, $cmb ) {
	$classes = array(
		'class1',
		'class2',
		// etc...
	);

	return $classes;
}



show_on_cb ​

Callback to determine if metabox should display. The callback gets passed the CMB2 $cmb object. More info: Adding your own show_on filters

'show_on_cb' => 'yourprefix_only_show_for_user_1'

php
/**
 * Only display a box if the current user is 1
 * @param  object $cmb Current box object
 * @return bool          True if current user's ID is 1
 */
function yourprefix_only_show_for_user_1( $cmb ) {
	// Returns true if current user's ID is 1, else false
	return 1 === get_current_user_id();
}

'show_on_cb' => 'yourprefix_show_for_pages_without_template'

php
/**
 * Only display a box if on a page w/o a template assigned.
 * @param  object $cmb Current box object
 * @return bool          
 */
function yourprefix_show_for_pages_without_template( $cmb ) {
	$current_template = get_post_meta( $cmb->object_id(), '_wp_page_template', true );
	return empty( $current_template ) || 'default' === $current_template;
}



show_on ​

Post IDs or page templates to display this metabox. Overrides 'show_on_cb'. More info: Adding your own show_on filters

'show_on' => array( 'id' => 2 ), // Only show on the "about" page


cmb_styles ​

Whether to enqeue CMB2 stylesheet. Default is true.

'cmb_styles' => true,


enqueue_js ​

Whether to enqeue CMB2 Javascript files. Default is true.

'enqueue_js' => true,


fields ​

It is possible to pass an array of field arrays as a box property, but it is generally prefered to use the $cmb->add_field( ... ) method.

'fields' => array( array( ... ) ),


hookup ​

Handles hooking CMB2 forms/metaboxes into the post/attachement/user screens, and handles hooking in and saving those fields. Set to false if you plan on handling the form/field output/saving (via something like cmb2_metabox_form()). Default is true.

'hookup' => true,


save_fields ​

If false, will not save during hookup (see above). Default is true.

'save_fields' => true,


closed ​

Set to true to default metabox being closed. Default is false.

'closed' => false,


taxonomies ​

if object_types is set to 'term', it is required to provide a the taxonomies property, which should be an array of Taxonomies.

'taxonomies' => array( 'category', 'post_tag' ), // Tells CMB2 which taxonomies should have these fields.


new_user_section ​

if object_types is set to 'user', will determine where fields are output in the new-user screen. Options are 'add-existing-user' and 'add-new-user'. Default is 'add-new-user'.

'new_user_section' => 'add-existing-user',


new_term_section ​

if object_types is set to 'term', and set to false, will remove the fields from the new-term screen. Default is true.

'new_term_section' => false,


show_in_rest ​

Determines if/how fields/metabox are available in the REST API. Default is false. (More info)

'show_in_rest' => WP_REST_Server::READABLE, // or WP_REST_Server::ALLMETHODS/WP_REST_Server::EDITABLE


rest_read_capability ​

(since 2.13.0)

Declares who may read this box's data through the REST API, and is only applicable when show_in_rest is readable. Accepts false (no one may read it, administrators included), true (everyone may read it, logged-out visitors included), 'box-capability' (only holders of this box's capability property, falling back to manage_options), or any other capability string such as 'edit_posts' (only holders of the named capability). Default is null, which means CMB2's default policy: these reads are public today, but options-page boxes left unset will require the box capability in a future release. (More info)

The same parameter may be set on an individual field, where it takes precedence over the box's for reads of that field. The cmb2_api_get_box_permissions_check/cmb2_api_get_field_permissions_check filters still run afterward and have the final say.

'rest_read_capability' => 'box-capability',


remove_box_wrap ​

This parameter is for post alternate-context metaboxes only. To output the fields 'naked' (without a postbox wrapper/style):

'remove_box_wrap' => true,


This parameter is for options-page metaboxes only, and is sent along to add_menu_page()/add_submenu_page() to define the menu title.

'menu_title' => 'Site Options',


message_cb ​

This parameter is for options-page metaboxes only, and allows specifying a custom callback for seting the error/success messages. An example has been added to example-functions.php.

'message_cb' => 'yourprefix_options_page_message_callback',

php
/**
 * Callback to define the optionss-saved message.
 *
 * @param CMB2  $cmb The CMB2 object.
 * @param array $args {
 *     An array of message arguments
 *
 *     @type bool   $is_options_page Whether current page is this options page.
 *     @type bool   $should_notify   Whether options were saved and we should be notified.
 *     @type bool   $is_updated      Whether options were updated with save (or stayed the same).
 *     @type string $setting         For add_settings_error(), Slug title of the setting to which
 *                                   this error applies.
 *     @type string $code            For add_settings_error(), Slug-name to identify the error.
 *                                   Used as part of 'id' attribute in HTML output.
 *     @type string $message         For add_settings_error(), The formatted message text to display
 *                                   to the user (will be shown inside styled `<div>` and `<p>` tags).
 *                                   Will be 'Settings updated.' if $is_updated is true, else 'Nothing to update.'
 *     @type string $type            For add_settings_error(), Message type, controls HTML class.
 *                                   Accepts 'error', 'updated', '', 'notice-warning', etc.
 *                                   Will be 'updated' if $is_updated is true, else 'notice-warning'.
 * }
 */
function yourprefix_options_page_message_callback( $cmb, $args ) {
	if ( ! empty( $args['should_notify'] ) ) {

		if ( $args['is_updated'] ) {

			// Modify the updated message.
			$args['message'] = sprintf( esc_html__( '%s &mdash; Updated!', 'cmb2' ), $cmb->prop( 'title' ) );
		}

		add_settings_error( $args['setting'], $args['code'], $args['message'], $args['type'] );
	}
}



parent_slug ​

This parameter is for options-page metaboxes only, and is sent along to add_submenu_page() to define the parent-menu item slug.

'parent_slug' => 'tools.php',


capability ​

This parameter is for options-page metaboxes only, and is sent along to add_menu_page()/add_submenu_page() to define the capability required to view the options page.

'capability' => 'edit_posts',


icon_url ​

This parameter is for options-page metaboxes only, and is sent along to add_menu_page() to define the menu icon. Only applicable if parent_slug is left empty.

'icon_url' => 'dashicons-chart-pie',


position ​

This parameter is for options-page metaboxes only, and is sent along to add_menu_page() to define the menu position. Only applicable if parent_slug is left empty.

'position' => 1,


admin_menu_hook ​

This parameter is for options-page metaboxes only and defaults to 'admin_menu', to register your options-page at the network level:

'admin_menu_hook' => 'network_admin_menu',


display_cb ​

This parameter is for options-page metaboxes only and allows overriding the options page form output.

'display_cb' => 'my_callback_function_to_display_output',


save_button ​

This parameter is for options-page metaboxes only and defines the text for the options page save button. defaults to 'Save'.

'save_button' => 'Save Settings',

Documentation for the CMB2 WordPress developer toolkit.

CMB2 is released under the GPLv2+ license.