files/en-us/web/api/notificationevent/notification/index.md
{{APIRef("Web Notifications")}}{{AvailableInWorkers("service")}}
The notification read-only property of the {{domxref("NotificationEvent")}} interface returns the instance of the {{domxref("Notification")}} that was clicked to fire the event. The {{domxref("Notification")}} provides read-only access to many properties that were set at the instantiation time of the Notification such as tag and data attributes that allow you to store information for deferred use in the notificationclick event.
A {{domxref("Notification")}} object.
self.addEventListener("notificationclick", (event) => {
console.log("On notification click");
// Data can be attached to the notification so that you
// can process it in the notificationclick handler.
console.log(`Notification Tag: ${event.notification.tag}`);
console.log(`Notification Data: ${event.notification.data}`);
event.notification.close();
// This looks to see if the current is already open and
// focuses if it is
event.waitUntil(
clients
.matchAll({
type: "window",
})
.then((clientList) => {
for (const client of clientList) {
if (client.url === "/" && "focus" in client) return client.focus();
}
if (clients.openWindow) return clients.openWindow("/");
}),
);
});
{{Specifications}}
{{Compat}}