NavigationPageLoadedEvent example

throw new CategoryNotFoundException($category->getId());
        }

        $this->loadMetaData($category, $page, $context->getSalesChannel());
        $page->setNavigationId($category->getId());

        if ($category->getCmsPage()) {
            $page->setCmsPage($category->getCmsPage());
        }

        $this->eventDispatcher->dispatch(
            new NavigationPageLoadedEvent($page, $context, $request)
        );

        if ($page->getMetaInformation()) {
            $canonical = ($navigationId === $context->getSalesChannel()->getNavigationCategoryId())
                ? $this->seoUrlReplacer->generate('frontend.home.page')
                : $this->seoUrlReplacer->generate('frontend.navigation.page', ['navigationId' => $navigationId]);

            $page->getMetaInformation()->setCanonical($canonical);
        }

        return $page;
    }