Adding Metaboxes - rogerlos/cmb2-metatabs-options GitHub Wiki

You can add metaboxes to a CMO options page by:

• Adding boxes to an array which you inject into the class via the boxes argument, see the "Quick Example". This array can contain either/mixed CMB2 metabox objects or CMB2 metabox id strings.
• Adding boxes directly to the class (ie, "hard coding" them), doing so within the cmb2_metaboxes() method
• Adding boxes elsewhere in your program in the usual CMB2 fashion, as long as you do so before calling new Cmb2_Metatabs_Options().

If you use the final option, you still need to heed the following "rules":

Important: There are two parameters you must add to your metaboxes for them to display and save successfully on your options page.

Consider this simple box:

$cmb = new_cmb2_box(
    array(
		'id' => 'test_metabox',
		'title' => __( 'Test Metabox', 'cmb2' ),
		'show_on' => array(
		     'key' => 'options-page',
		     'value' => array( 'your_option_name', ),
		),
	)
);
$cmb->object_type( 'options-page' );

Note the show_on argument and its value, an array:

'show_on' => array(
	'key' => 'options-page',
	'value' => array( 'your_option_name', ),
)

The first argument, key, must be exactly as shown, "options-page"; this is the trigger CMB2 uses to save "settings" instead of "metadata".

The second argument, value, is a plain array containing the options page id (or multiple ids, if you want to share the box on multiple options pages--you cannot, unfortunately, share metaboxes between "post editors" and "options pages" because of this internal CMB2 distinction between options and metadata).

The last line in our sample:

$cmb->object_type( 'options-page' );

Explicitly sets the object-type for this box. If you skip this, the initial load of the options page will not show your saved values--your metaboxes will display, but saved values will not be shown in your fields. (I believe this is a minor bug in CMB2, but it's easily worked around.)