gridresponse.php

См. документацию.

<?php
 
namespace Bitrix\Main\Grid\UI;
 
use Bitrix\Main\Application;
use Bitrix\Main\Engine\Response\Json;
use CMain;

class GridResponse implements \Bitrix\Main\Grid\GridResponse
{
    private array $messages = [];
    private mixed $payload = null;

    public function addMessage(string $message, string $type): void
    {
        $this->messages[] = [
            'TYPE' => $type,
            'TEXT' => $message,
        ];
    }

    public function setPayload(mixed $payload): void
    {
        $this->payload = $payload;
    }

    public function isSendable(): bool
    {
        return !(
            empty($this->messages) && empty($this->payload)
        );
    }

    public function send(): void
    {
        global $APPLICATION;

 
        $APPLICATION->RestartBuffer();
 
        // TODO: fix JS code for correct work without messages
        $responseData = [
            'messages' => $this->messages,
        ];
        if (!empty($this->payload))
        {
            $responseData['payload'] = $this->payload;
        }
 
        $response = new Json($responseData);
 
        Application::getInstance()->end(200, $response);
    }
}