WindowClient: focus() method

Note: This feature is only available in Service Workers.

The focus() method of the WindowClient interface gives user input focus to the current client and returns a Promise that resolves to the existing WindowClient.

Syntax

js
focus()

Parameters

None.

Return value

A Promise that resolves to the existing WindowClient.

Exceptions

InvalidAccessError DOMException

The promise is rejected with this exception if none of the windows in the app's origin have transient activation.

Security requirements

Examples

js
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("/");
      }),
  );
});

Specifications