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Current File : //home/rtorresani/www/vendor/magento/module-offline-shipping/Block/Adminhtml/Form/Field/Export.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\OfflineShipping\Block\Adminhtml\Form\Field;

/**
 * Export CSV button for shipping table rates
 *
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Export extends \Magento\Framework\Data\Form\Element\AbstractElement
{
    /**
     * @var \Magento\Backend\Model\UrlInterface
     */
    protected $_backendUrl;

    /**
     * @param \Magento\Framework\Data\Form\Element\Factory $factoryElement
     * @param \Magento\Framework\Data\Form\Element\CollectionFactory $factoryCollection
     * @param \Magento\Framework\Escaper $escaper
     * @param \Magento\Backend\Model\UrlInterface $backendUrl
     * @param array $data
     */
    public function __construct(
        \Magento\Framework\Data\Form\Element\Factory $factoryElement,
        \Magento\Framework\Data\Form\Element\CollectionFactory $factoryCollection,
        \Magento\Framework\Escaper $escaper,
        \Magento\Backend\Model\UrlInterface $backendUrl,
        array $data = []
    ) {
        parent::__construct($factoryElement, $factoryCollection, $escaper, $data);
        $this->_backendUrl = $backendUrl;
    }

    /**
     * @return string
     */
    public function getElementHtml()
    {
        /** @var \Magento\Backend\Block\Widget\Button $buttonBlock  */
        $buttonBlock = $this->getForm()->getParent()->getLayout()->createBlock(
            \Magento\Backend\Block\Widget\Button::class
        );

        $params = ['website' => $buttonBlock->getRequest()->getParam('website')];

        $url = $this->_backendUrl->getUrl("*/*/exportTablerates", $params);
        $data = [
            'label' => __('Export CSV'),
            'onclick' => "setLocation('" .
            $url .
            "conditionName/' + $('carriers_tablerate_condition_name').value + '/tablerates.csv' )",
            'class' => '',
        ];

        $html = $buttonBlock->setData($data)->toHtml();
        return $html;
    }
}