Web/API/WindowClient

The WindowClient interface of the ServiceWorker API represents the scope of a service worker client that is a document in a browsing context, controlled by an active worker. The service worker client independently selects and uses a service worker for its own loading and sub-resources.

Methods

WindowClient inherits methods from its parent interface, Client.

WindowClient.focus(): Gives user input focus to the current client.
WindowClient.navigate(): Loads a specified URL into a controlled client page.

Properties

WindowClient inherits properties from its parent interface, Client.

WindowClient.focused Read only: A boolean that indicates whether the current client has focus.
WindowClient.visibilityState Read only: Indicates the visibility of the current client. This value can be one of "hidden", "visible", or "prerender".

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) {
        client.focus();
        break;
      }
    }
    if (clients.openWindow)
      return clients.openWindow('/');
  }));
});

Specifications

Specification	Status	Comment
Service WorkersThe definition of 'WindowClient' in that specification.	Working Draft	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`WindowClient` Experimental'	Chrome Full support 42	Edge Full support ≤18	Firefox Full support 44 Notes' Full support 44 Notes' Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No support No	Opera ?	Safari No support No	WebView Android No support No	Chrome Android Full support 42	Firefox Android Full support 44	Opera Android ?	Safari iOS No support No	Samsung Internet Android Full support 4.0
`ancestorOrigins`	Chrome ?	Edge ?	Firefox ?	IE No support No	Opera ?	Safari No support No	WebView Android No support No	Chrome Android ?	Firefox Android ?	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?
`focus` Experimental'	Chrome Full support 42	Edge Full support ≤18	Firefox Full support 44 Notes' Full support 44 Notes' Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No support No	Opera ?	Safari No support No	WebView Android No support No	Chrome Android Full support 42	Firefox Android Full support 44	Opera Android ?	Safari iOS No support No	Samsung Internet Android Full support 4.0
`focused` Experimental'	Chrome Full support 42	Edge Full support ≤18	Firefox Full support 44 Notes' Full support 44 Notes' Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No support No	Opera ?	Safari No support No	WebView Android No support No	Chrome Android Full support 42	Firefox Android Full support 44	Opera Android ?	Safari iOS No support No	Samsung Internet Android Full support 4.0
`navigate` Experimental'	Chrome Full support 49	Edge Full support ≤18	Firefox Full support 44 Notes' Full support 44 Notes' Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No support No	Opera ?	Safari No support No	WebView Android No support No	Chrome Android Full support 49	Firefox Android Full support 44	Opera Android ?	Safari iOS No support No	Samsung Internet Android Full support 4.0
`visibilityState` Experimental'	Chrome Full support 42	Edge Full support ≤18	Firefox Full support 44 Notes' Full support 44 Notes' Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No support No	Opera ?	Safari No support No	WebView Android No support No	Chrome Android Full support 42	Firefox Android Full support 44	Opera Android ?	Safari iOS No support No	Samsung Internet Android Full support 4.0

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.
See implementation notes.': See implementation notes.