RadioElement.php

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<?php
namespace TYPO3\CMS\Form\Domain\Model\Element;

class RadioElement extends \TYPO3\CMS\Form\Domain\Model\Element\AbstractElement {

    protected $allowedAttributes = array(
        'accesskey' => '',
        'alt' => '',
        'checked' => '',
        'class' => '',
        'dir' => '',
        'disabled' => '',
        'id' => '',
        'lang' => '',
        'name' => '',
        'style' => '',
        'tabindex' => '',
        'title' => '',
        'type' => 'radio',
        'value' => ''
    );

    protected $mandatoryAttributes = array(
        'name',
        'id'
    );

    protected $acceptsParentName = TRUE;

    public function checkFilterAndSetIncomingDataFromRequest() {
        if ($this->value === '') {
            $this->value = (string) $this->getElementId();
            $this->setAttribute('value', $this->value);
        }
        if ($this->requestHandler->has($this->getName())) {
            $submittedValue = $this->requestHandler->getByMethod($this->getName());
            if ($submittedValue === $this->value) {
                $this->setAttribute('checked', 'checked');
            }
        } elseif ($this->requestHandler->hasRequest()) {
            $this->attributes->removeAttribute('checked');
        }
        return $this;
    }

}