Extended.php

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<?php
namespace Magento\Backend\Block\Widget\Grid\Massaction;

class Extended extends \Magento\Backend\Block\Widget
{
    protected $_items = [];

    protected $_template = 'Magento_Backend::widget/grid/massaction_extended.phtml';

    protected $_backendData = null;

    protected $_jsonEncoder;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Json\EncoderInterface $jsonEncoder,
        \Magento\Backend\Helper\Data $backendData,
        array $data = []
    ) {
        $this->_jsonEncoder = $jsonEncoder;
        $this->_backendData = $backendData;
        parent::__construct($context, $data);
    }

    public function _construct()
    {
        parent::_construct();
        $this->setErrorText($this->escapeHtml(__('An item needs to be selected. Select and try again.')));
    }

    public function addItem($itemId, array $item)
    {
        $this->_items[$itemId] = $this->getLayout()->createBlock(
            \Magento\Backend\Block\Widget\Grid\Massaction\Item::class
        )->setData(
            $item
        )->setMassaction(
            $this
        )->setId(
            $itemId
        );

        if ($this->_items[$itemId]->getAdditional()) {
            $this->_items[$itemId]->setAdditionalActionBlock($this->_items[$itemId]->getAdditional());
            $this->_items[$itemId]->unsAdditional();
        }

        return $this;
    }

    public function getItem($itemId)
    {
        if (isset($this->_items[$itemId])) {
            return $this->_items[$itemId];
        }

        return null;
    }

    public function getItems()
    {
        return $this->_items;
    }

    public function getItemsJson()
    {
        $result = [];
        foreach ($this->getItems() as $itemId => $item) {
            $result[$itemId] = $item->toArray();
        }

        return $this->_jsonEncoder->encode($result);
    }

    public function getCount()
    {
        return sizeof($this->_items);
    }

    public function isAvailable()
    {
        return $this->getCount() > 0 && $this->getParentBlock()->getMassactionIdField();
    }

    public function getFormFieldName()
    {
        return $this->getData('form_field_name') ? $this->getData('form_field_name') : 'massaction';
    }

    public function getFormFieldNameInternal()
    {
        return 'internal_' . $this->getFormFieldName();
    }

    public function getJsObjectName()
    {
        return $this->getHtmlId() . 'JsObject';
    }

    public function getGridJsObjectName()
    {
        return $this->getParentBlock()->getJsObjectName();
    }

    public function getSelectedJson()
    {
        if ($selected = $this->getRequest()->getParam($this->getFormFieldNameInternal())) {
            $selected = explode(',', $selected);
            return join(',', $selected);
        }
        return '';
    }

    public function getSelected()
    {
        if ($selected = $this->getRequest()->getParam($this->getFormFieldNameInternal())) {
            $selected = explode(',', $selected);
            return $selected;
        }
        return [];
    }

    public function getApplyButtonHtml()
    {
        return $this->getButtonHtml(__('Submit'), $this->getJsObjectName() . ".apply()");
    }

    public function getJavaScript()
    {
        return " {$this->getJsObjectName()} = new varienGridMassaction('{$this->getHtmlId()}', " .
            "{$this->getGridJsObjectName()}, '{$this->getSelectedJson()}'" .
            ", '{$this->getFormFieldNameInternal()}', '{$this->getFormFieldName()}');" .
            "{$this->getJsObjectName()}.setItems({$this->getItemsJson()}); " .
            "{$this->getJsObjectName()}.setGridIds('{$this->getGridIdsJson()}');" .
            ($this->getUseAjax() ? "{$this->getJsObjectName()}.setUseAjax(true);" : '') .
            ($this->getUseSelectAll() ? "{$this->getJsObjectName()}.setUseSelectAll(true);" : '') .
            "{$this->getJsObjectName()}.errorText = '{$this->getErrorText()}';" . "\n" .
            "window.{$this->getJsObjectName()} = {$this->getJsObjectName()};";
    }

    public function getGridIdsJson()
    {
        if (!$this->getUseSelectAll()) {
            return '';
        }

        $allIdsCollection = clone $this->getParentBlock()->getCollection();

        if ($this->getMassactionIdField()) {
            $massActionIdField = $this->getMassactionIdField();
        } else {
            $massActionIdField = $this->getParentBlock()->getMassactionIdField();
        }

        $gridIds = $allIdsCollection->setPageSize(0)->getColumnValues($massActionIdField);

        if (!empty($gridIds)) {
            return join(",", $gridIds);
        }
        return '';
    }

    public function getHtmlId()
    {
        return $this->getParentBlock()->getHtmlId() . '_massaction';
    }

    public function removeItem($itemId)
    {
        if (isset($this->_items[$itemId])) {
            unset($this->_items[$itemId]);
        }

        return $this;
    }

    public function getUseSelectAll()
    {
        return $this->_getData('use_select_all') === null || $this->_getData('use_select_all');
    }

    public function setUseSelectAll($flag)
    {
        $this->setData('use_select_all', (bool)$flag);
        return $this;
    }
}