ErrorsViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Form;

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY 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 the script.                                         *
 * If not, see http://www.gnu.org/licenses/lgpl.html                      *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */
class ErrorsViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    public function render($for = '', $as = 'error') {
        $errors = $this->controllerContext->getRequest()->getErrors();
        if ($for !== '' && $for !== NULL) {
            $propertyPath = explode('.', $for);
            foreach ($propertyPath as $currentPropertyName) {
                $errors = $this->getErrorsForProperty($currentPropertyName, $errors);
            }
        }
        $output = '';
        foreach ($errors as $errorKey => $error) {
            $this->templateVariableContainer->add($as, $error);
            $output .= $this->renderChildren();
            $this->templateVariableContainer->remove($as);
        }
        return $output;
    }

    protected function getErrorsForProperty($propertyName, $errors) {
        foreach ($errors as $error) {
            if ($error instanceof \TYPO3\CMS\Extbase\Validation\PropertyError) {
                if ($error->getPropertyName() === $propertyName) {
                    return $error->getErrors();
                }
            }
        }
        return array();
    }
}