OptionElement.php

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

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

    protected $allowedAttributes = array(
        'class' => '',
        'disabled' => '',
        'id' => '',
        'label' => '',
        'lang' => '',
        'selected' => '',
        'style' => '',
        'title' => '',
        'value' => ''
    );

    protected $mandatoryAttributes = array();

    protected $parentName;

    public function getData() {
        return $this->data;
    }

    public function setParentName($parentName) {
        $this->parentName = $parentName;
        $this->checkFilterAndSetIncomingDataFromRequest();
        return $this;
    }

    public function checkFilterAndSetIncomingDataFromRequest() {
        if ($this->value === '') {
            $this->value = (string) $this->getElementId();
            $this->setAttribute('value', $this->value);
        }
        if (!empty($this->parentName)) {
            if ($this->requestHandler->has($this->parentName)) {
                $submittedValue = $this->requestHandler->getByMethod($this->parentName);
                if (is_array($submittedValue) && in_array($this->value, $submittedValue)) {
                    $this->setAttribute('selected', 'selected');
                } elseif ($submittedValue === $this->value) {
                    $this->setAttribute('selected', 'selected');
                } elseif (is_array($submittedValue) && in_array('on', $submittedValue)) {
                    $this->setAttribute('selected', 'selected');
                } else {
                    $this->attributes->removeAttribute('selected');
                }
            } elseif ($this->requestHandler->hasRequest()) {
                $this->attributes->removeAttribute('selected');
            }
        }
        return $this;
    }

}