RadioViewHelper.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 RadioViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Form\AbstractFormFieldViewHelper {

    protected $tagName = 'input';

    public function initializeArguments() {
        parent::initializeArguments();
        $this->registerTagAttribute('disabled', 'string', 'Specifies that the input element should be disabled when the page loads');
        $this->registerArgument('errorClass', 'string', 'CSS class to set if there are errors for this view helper', FALSE, 'f3-form-error');
        $this->overrideArgument('value', 'string', 'Value of input tag. Required for radio buttons', TRUE);
        $this->registerUniversalTagAttributes();
    }

    public function render($checked = NULL) {
        $this->tag->addAttribute('type', 'radio');

        $nameAttribute = $this->getName();
        $valueAttribute = $this->getValue();
        if ($checked === NULL && $this->isObjectAccessorMode()) {
            if ($this->hasMappingErrorOccurred()) {
                $propertyValue = $this->getLastSubmittedFormData();
            } else {
                $propertyValue = $this->getPropertyValue();
            }

            // no type-safe comparison by intention
            $checked = $propertyValue == $valueAttribute;
        }

        $this->registerFieldNameForFormTokenGeneration($nameAttribute);
        $this->tag->addAttribute('name', $nameAttribute);
        $this->tag->addAttribute('value', $valueAttribute);
        if ($checked) {
            $this->tag->addAttribute('checked', 'checked');
        }

        $this->setErrorClassAttribute();

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