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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/notificationclick_event below:

ServiceWorkerGlobalScope: notificationclick event - Web APIs

Limited availability

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is only available in Service Workers.

The notificationclick event of the ServiceWorkerGlobalScope interface is fired to indicate that a system notification spawned by ServiceWorkerRegistration.showNotification() has been clicked.

Notifications created on the main thread or in workers which aren't service workers using the Notification() constructor will instead receive a click event on the Notification object itself.

This event is not cancelable and does not bubble.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("notificationclick", (event) => { })

onnotificationclick = (event) => { }

Inherits properties from its ancestors, ExtendableEvent and Event.

NotificationEvent.notification Read only

Returns a Notification object representing the notification that was clicked to fire the event.

NotificationEvent.action Read only

Returns the string ID of the notification button the user clicked. This value returns an empty string if the user clicked the notification somewhere other than an action button, or the notification does not have a button.

You can use the notificationclick event in an addEventListener method:

self.addEventListener("notificationclick", (event) => {
  console.log("On notification click: ", event.notification.tag);
  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("/");
      }),
  );
});

Or use the onnotificationclick event handler property:

self.onnotificationclick = (event) => {
  console.log("On notification click: ", event.notification.tag);
  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("/");
      }),
  );
};

You can handle event actions using event.action within a notificationclick event handler:

navigator.serviceWorker.register("sw.js");
Notification.requestPermission().then((result) => {
  if (result === "granted") {
    navigator.serviceWorker.ready.then((registration) => {
      // Show a notification that includes an action titled Archive.
      registration.showNotification("New mail from Alice", {
        actions: [
          {
            action: "archive",
            title: "Archive",
          },
        ],
      });
    });
  }
});

self.addEventListener(
  "notificationclick",
  (event) => {
    event.notification.close();
    if (event.action === "archive") {
      // User selected the Archive action.
      archiveEmail();
    } else {
      // User selected (e.g., clicked in) the main body of notification.
      clients.openWindow("/inbox");
    }
  },
  false,
);

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