HiddenElement.php

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

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

    protected $allowedAttributes = array(
        'class' => '',
        'id' => '',
        'lang' => '',
        'name' => '',
        'style' => '',
        'type' => 'hidden',
        'value' => ''
    );

    protected $mandatoryAttributes = array(
        'name'
    );

    public function checkFilterAndSetIncomingDataFromRequest() {
        if ($this->requestHandler->has($this->getName())) {
            $value = $this->requestHandler->getByMethod($this->getName());
            $value = $this->filter->filter($value);
            $this->attributes->addAttribute('value', $value);
        }
        return $this;
    }

}