The controller
read-only property of the ServiceWorkerContainer
interface returns a ServiceWorker
object if its state is activating
or 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 WorkersThe 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.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chrome
Full support 40 |
Edge Full support 17 Full support 17 Full support 16 Disabled' From version 16: this feature is behind the |
Firefox Full support 44 Full support 44 Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API. |
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.
ServiceWorkerContainer.controller by Mozilla Contributors is licensed under CC-BY-SA 2.5.