Abandoned
There is a better alternative: https://github.com/rubengc/cmb2-field-ajax-search
CMB2 User Search field
Custom field for CMB2 which adds a user-search dialog for searching/attaching other user IDs with drag & drop support.
Adds a new text field type (with a button), user_search_text that adds a quick user search dialog for saving user IDs to a text input.
Example
Initialize the fields
// Classic CMB2 declaration
$cmb = new_cmb2_box( array(
'id' => 'prefix-metabox-id',
'title' => __( 'Post Info' ),
'object_types' => array( 'post', ), // Post type
) );
// Add new field
$cmb->add_field( array(
'name' => __( 'User(s)' ),
'id' => 'prefix-user',
'type' => 'user_search_text',
'roles' => array( 'administrator', 'author', 'editor' )
) );Show in the frontend
$users = get_post_meta( get_the_ID(), 'prefix-user', true );
$user_split = explode( ',', str_replace( ' ', '', $users ) );
foreach ( $user_split as $user ) {
$user = get_user_by( 'id', $user );
$name = trim( $user->display_name ) ? $user->display_name : $user->user_login;
echo '<b>' . $name . '</b>, ';
}