HiddenViewHelper.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.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

class HiddenViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Form\AbstractFormFieldViewHelper {

    protected $tagName = 'input';

    public function initializeArguments() {
        parent::initializeArguments();
        $this->registerUniversalTagAttributes();
    }

    public function render() {
        $name = $this->getName();
        $this->registerFieldNameForFormTokenGeneration($name);

        $this->tag->addAttribute('type', 'hidden');
        $this->tag->addAttribute('name', $name);
        $this->tag->addAttribute('value', $this->getValue());

        return $this->tag->render();
    }
}