/**
* Listing the active users for ajax.
* Entering 'forum#XX' (or any last part of 'forum' with #XX) looks for
* member of the XX ID without username.
* Entering integer looks for member with XX in username or empty username
* and that ID.
* @param string $q Username query
* @return string|\yii\web\Response
*/
public function actionFieldlist($q = null)
{
if (!Yii::$app->request->isAjax) {
return $this->redirect(['default/index']);
}
return User::getMembersList($q);
}