WindowClient.focus

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

Client.focus().then(function(WindowClient) {
  // do something with your WindowClient once it has been focused
});

Parameters

None.

Returns

A Promise that resolves to the existing WindowClient.

Example

self.addEventListener('notificationclick', function(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(function(clientList) {
    for (var i = 0; i < clientList.length; i++) {
      var client = clientList[i];
      if (client.url == '/' && 'focus' in client)
        return client.focus();
    }
    if (clients.openWindow)
      return clients.openWindow('/');
  }));
});

Specifications

Specification	Status	Comment
Service Workers The definition of 'focus()' in that specification.	Working Draft	Initial definition.

Browser compatibility

[1] Service workers (and Push) have been disabled in the Firefox 45 Extended Support Release (ESR.)