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Notifications
You can send two types on notifications to the users.
Notification bar is displayed in specific situations as a message bar appearing at the bottom of the page.
It appears to whoever is doing a specific operation in the back office.

Custom notifications are sent to a specific user.
They appear in their profile in the back office.

Notification bars
Notifications are displayed as a message bar in the back office.
There are four types of notifications: info, success, warning and error.
Displaying notifications from PHP
To send a notification from PHP, inject the TranslatableNotificationHandlerInterface into your class.
|  | $this->notificationHandler->info(
    /** @Desc("Notification text") */
    'example.notification.text',
    [],
    'domain'
);
 | 
To have the notification translated, provide the message strings in the translation files under the correct domain and key.
Displaying notifications from front end
To create a notification from the front end (in this example, of type info), use the following code:
|  | const eventInfo = new CustomEvent('ibexa-notify', {
    detail: {
        label: 'info',
        message: 'Notification text'
    }
});
 | 
Dispatch the event with document.body.dispatchEvent(eventInfo);.
Create custom notifications
You can send your own custom notifications to the user which are displayed in the user menu.
To create a new notification you must use the createNotification(Ibexa\Contracts\Core\Repository\Values\Notification\CreateStruct $createStruct) method from Ibexa\Contracts\Core\Repository\NotificationService.
Example:
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39 | <?php declare(strict_types=1);
namespace App\EventListener;
use Ibexa\Contracts\Core\Repository\Events\Content\PublishVersionEvent;
use Ibexa\Contracts\Core\Repository\NotificationService;
use Ibexa\Contracts\Core\Repository\Values\Notification\CreateStruct;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
final class ContentPublishEventListener implements EventSubscriberInterface
{
    private NotificationService $notificationService;
    public function __construct(NotificationService $notificationService)
    {
        $this->notificationService = $notificationService;
    }
    public static function getSubscribedEvents()
    {
        return [PublishVersionEvent::class => 'onPublishVersion'];
    }
    public function onPublishVersion(PublishVersionEvent $event): void
    {
        $data = [
            'content_name' => $event->getContent()->getName(),
            'content_id' => $event->getContent()->id,
            'message' => 'published',
        ];
        $notification = new CreateStruct();
        $notification->ownerId = $event->getContent()->contentInfo->ownerId;
        $notification->type = 'ContentPublished';
        $notification->data = $data;
        $this->notificationService->createNotification($notification);
    }
}
 | 
To display the notification, write a renderer and tag it as a service.
The example below presents a renderer that uses Twig to render a view:
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37 | <?php
declare(strict_types=1);
namespace App\Notification;
use Ibexa\Contracts\Core\Repository\Values\Notification\Notification;
use Ibexa\Core\Notification\Renderer\NotificationRenderer;
use Symfony\Component\Routing\RouterInterface;
use Twig\Environment;
class MyRenderer implements NotificationRenderer
{
    protected Environment $twig;
    protected RouterInterface $router;
    public function __construct(Environment $twig, RouterInterface $router)
    {
        $this->twig = $twig;
        $this->router = $router;
    }
    public function render(Notification $notification): string
    {
        return $this->twig->render('@ibexadesign/notification.html.twig', ['notification' => $notification]);
    }
    public function generateUrl(Notification $notification): ?string
    {
        if (array_key_exists('content_id', $notification->data)) {
            return $this->router->generate('ibexa.content.view', ['contentId' => $notification->data['content_id']]);
        }
        return null;
    }
}
 | 
You can add the template that is defined above in the render() method to one of your custom bundles:
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27 | {% extends '@ibexadesign/account/notifications/list_item.html.twig' %}
{% trans_default_domain 'custom_notification' %}
{% set wrapper_additional_classes = 'css-class-custom' %}
{% block icon %}
    <span class="type__icon">
        <svg class="ibexa-icon ibexa-icon--review">
            <use xlink:href="{{ ibexa_icon_path('view') }}"></use>
        </svg>
    </span>
{% endblock %}
{% block notification_type %}
    <span class="type__text">
        {{ 'Notice'|trans|desc('Notice') }}
    </span>
{% endblock %}
{% block message %}
    {% embed '@ibexadesign/ui/component/table/table_body_cell.html.twig' with { class: 'ibexa-notifications-modal__description' } %}
        {% block content %}
            <p class="description__text">{{ notification.data.content_name }} {{ notification.data.message }}</p>
        {% endblock %}
    {% endembed %}
{% endblock %}
 | 
Finally, you need to add an entry to config/services.yaml:
|  | services:
    App\Notification\MyRenderer:
        tags:
            - { name: ibexa.notification.renderer, alias: ContentPublished }
 | 
Notification timeout
To define the timeout for hiding Back-Office notification bars, per notification type, use the ibexa.system.<scope>.notifications.<notification_type>.timeout configuration key:
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12 | ibexa:
    system:
        admin:
            notifications:
                error:
                    timeout: 0
                warning:
                    timeout: 0
                success:
                    timeout: 5000
                info:
                    timeout: 0
 | 
The values shown above are the defaults.
0 means the notification doesn't hide automatically.