extension.php

См. документацию.

<?php
 
namespace Bitrix\Main\Engine\Response\Render;
 
use Bitrix\Main\Engine\Response\Render\Exception\InvalidConfigExtensionException;
use Bitrix\Main\Web\Json;
use CUtil;
 
final class Extension extends Base
{
    public function __construct(
        private string $extension,
        private array $params = [],
        bool $withSiteTemplate = true,
    )
    {
        parent::__construct($withSiteTemplate);
    }
 
    protected function renderContent(): void
    {
        $html = null;
        $controllerEntryPoint = $this->getControllerEntryPoint();
 
        if ($controllerEntryPoint)
        {
            $containerId = uniqid('render_container_');
            $selector = CUtil::JSEscape('#' . $containerId);
 
            $jsonParams = Json::encode($this->params);
 
            $html = join('', [
                "<div id='{$containerId}'></div>",
                "<script>BX.ready(() => { {$controllerEntryPoint}('{$selector}', {$jsonParams}) });</script>",
            ]);
        }
        else
        {
            throw new InvalidConfigExtensionException(
                $this->extension,
                '`controllerEntrypoint` is not defined in extension config',
            );
        }
 
        \Bitrix\Main\UI\Extension::load($this->extension);
 
        echo $html;
    }
 
    private function getControllerEntryPoint(): ?string
    {
        $config = \Bitrix\Main\UI\Extension::getConfig($this->extension);
        if (isset($config['controllerEntrypoint']))
        {
            if (!is_string($config['controllerEntrypoint']))
            {
                throw new InvalidConfigExtensionException(
                    $this->extension,
                    '`controllerEntrypoint` in config must be a string with JS function name',
                );
            }
 
            return $config['controllerEntrypoint'];
        }
 
        return null;
    }
}