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
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
controller | Chrome Full support 40 | Edge
Full support
17
| Firefox
Full support
44
| IE No support No | Opera Full support 27 | Safari Full support 11.1 | WebView Android Full support 40 | Chrome Android Full support 40 | Firefox Android Full support 44 | Opera Android Full support 27 | Safari iOS Full support 11.3 | Samsung Internet Android Full support 4.0 |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.