UrlKeyRenderer.php

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<?php
namespace Magento\CatalogUrlRewrite\Block;

use Magento\Store\Model\ScopeInterface;

class UrlKeyRenderer extends \Magento\Catalog\Block\Adminhtml\Form\Renderer\Fieldset\Element
{
    const XML_PATH_SEO_SAVE_HISTORY = 'catalog/seo/save_rewrites_history';

    protected $_elementFactory;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Data\Form\Element\Factory $elementFactory,
        array $data = []
    ) {
        $this->_elementFactory = $elementFactory;
        parent::__construct($context, $data);
    }

    public function getElementHtml()
    {
        $element = $this->getElement();
        if (!$element->getValue()) {
            return parent::getElementHtml();
        }
        $element->setOnkeyup("onUrlkeyChanged('" . $element->getHtmlId() . "')");
        $element->setOnchange("onUrlkeyChanged('" . $element->getHtmlId() . "')");

        $data = ['name' => $element->getData('name') . '_create_redirect', 'disabled' => true];
        $hidden = $this->_elementFactory->create('hidden', ['data' => $data]);
        $hidden->setForm($element->getForm());

        $storeId = $element->getForm()->getDataObject()->getStoreId();
        $data['html_id'] = $element->getHtmlId() . '_create_redirect';
        $data['label'] = __('Create Permanent Redirect for old URL');
        $data['value'] = $element->getValue();
        $data['checked'] = $this->_scopeConfig->isSetFlag(
            self::XML_PATH_SEO_SAVE_HISTORY,
            ScopeInterface::SCOPE_STORE,
            $storeId
        );
        $checkbox = $this->_elementFactory->create('checkbox', ['data' => $data]);
        $checkbox->setForm($element->getForm());

        return parent::getElementHtml() . '<br/>' . $hidden->getElementHtml() . $checkbox->getElementHtml()
            . $checkbox->getLabelHtml();
    }
}