productpanel.php

<?php
 
namespace Bitrix\Catalog\Grid\Panel\UI;
 
use Bitrix\Catalog\Grid\Panel\UI\Item\ChangePricesActionsItem;
use Bitrix\Main\Filter\Filter;
use Bitrix\Main\Grid\GridRequest;
use Bitrix\Main\Grid\GridResponse;
use Bitrix\Main\Grid\Panel\Panel;
use Bitrix\Main\Grid\UI\Response\GridResponseFactory;
use Bitrix\Main\Result;
 
class ProductPanel extends Panel
{
    public function processRequest(GridRequest $request, ?Filter $filter = null): ?GridResponse
    {
        $result = parent::processRequest($request, $filter);
        if (isset($result))
        {
            return $result;
        }
 
        $actionId = $request->getHttpRequest()->getPost('action');
        if ($actionId === 'change_price')
        {
            $action = $this->getActionById(ChangePricesActionsItem::getId());
            if (isset($action))
            {
                $result = $action->processRequest($request->getHttpRequest(), false, $filter);
                if ($result instanceof Result)
                {
                    return (new GridResponseFactory)->createFromResult($result);
                }
            }
        }
 
        return null;
    }
}