public function setValidator($validator = null)
 {
     if (count($this->getValidators()) === 0 && $validator instanceof FormHandler\Validator\FunctionCallable && is_array($validator->getCallable())) {
         $callable = $validator->getCallable();
         //detect if it is an optional validator
         if ($callable[0] instanceof Validator && substr($callable[1], 0, 1) !== '_') {
             parent::setValidator(new \FormHandler\Validator\NotEmpty());
         }
     }
     return parent::setValidator(FormHandler::parseValidator($validator, $this));
 }
/*
 * Copyright (C) 2015 FormHandler
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 *
 * @author Marien den Besten
 */
include '../src/Loader.php';
use FormHandler\FormHandler;
\FormHandler\Configuration::set('fhtml_dir', '../src/FHTML/');
$form = new FormHandler();
\FormHandler\Field\Temperature::set($form, 'Temperature', 'tem')->allowEmpty(true);
//process all form results, needs to be done before any output has been done
$form_html = $form->flush();
//below is code to show the form
echo 'Test for temperature field disabling. <hr>';
echo $form_html;