DeprecatedThis feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Important: In modern browsers, this property has been deprecated. Service worker messages will now use the MessageEvent
interface, for consistency with other web messaging features.
The source read-only property of the ServiceWorkerMessageEvent
returns a reference to the ServiceWorker
object of the associated service worker that sent the message.
Syntax
var mySource = ServiceWorkerMessageEventInstance.source;
Value
A ServiceWorker
or MessagePort
object.
Examples
When the following code is used inside the main thread to set up a message channel between it and a service worker for sending messages between the two, the event object of onmessage
will be a ServiceWorkerMessageEvent
.
navigator.serviceWorker.ready.then(function(reg) {
...
// set up a message channel to communicate with the SW
var channel = new MessageChannel();
channel.port1.onmessage = function(e) {
console.log(e.source);
handleChannelMessage(e.data);
}
mySW = reg.active;
mySW.postMessage('hello', [channel.port2]);
});
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 45 |
Edge Full support 17 Full support 17 Full support 16 Disabled' From version 16: this feature is behind the |
Firefox No support 44 — 55 No support 44 — 55 Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
Notes' In Firefox 55 and later, the standard |
IE
No support No |
Opera
Full support 24 |
Safari
No support No |
WebView Android
No support No |
Chrome Android
Full support 45 |
Firefox Android
No support 44 — 55 |
Opera Android
Full support 24 |
Safari iOS
No support No |
Samsung Internet Android
Full support 4.0 |
Legend
- Full support
- Full support
- No support
- No support
- Deprecated. Not for use in new websites.'
- Deprecated. Not for use in new websites.
- See implementation notes.'
- See implementation notes.
- User must explicitly enable this feature.'
- User must explicitly enable this feature.
See also
ServiceWorkerMessageEvent.source by Mozilla Contributors is licensed under CC-BY-SA 2.5.