ServiceWorkerContainer.controller

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The controller read-only property of the ServiceWorkerContainer interface returns a ServiceWorker object if its state is activated (the same object returned by ServiceWorkerRegistration.active). This property returns null if the request is a force refresh (Shift + refresh) or if there is no active worker.

Syntax

var myController = navigator.serviceWorker.controller;

Value

A ServiceWorker object.

Example

if ('serviceWorker' in navigator) {
  // Do a one-off check to see if a service worker's in control.
  if (navigator.serviceWorker.controller) {
    console.log('This page is currently controlled by:',
      navigator.serviceWorker.controller);
  } else {
    console.log('This page is not currently controlled ' +
      'by a service worker.');
  }
} else {
  console.log('Service workers are not supported.');
}

Specifications

Specification Status Comment
Service Workers
The definition of 'ServiceWorkerRegistration.controller' in that specification.
Working Draft Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support40

161

17

442 No27 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support4040 ?4427 No4.0

1. From version 16: this feature is behind the Enable service workers preference.

2. Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR).

Document Tags and Contributors

Last updated by: fscholz,