The onmessage property of the ServiceWorkerGlobalScope
interface is an event handler fired whenever a message
event occurs — when incoming messages are received.
Note: Service workers define the extendable event to allow extending the lifetime of the event. For the message
event, service workers use the ExtendableMessageEvent
interface which extends the ExtendableEvent
interface.
Note: Messages received from service worker contexts (e.g. as the event object of onmessage
) are represented by MessageEvent
objects in modern browsers, for consistency with other web messaging features. (They used to be represented by ServiceWorkerMessageEvent
objects, which have now been deprecated.)
Syntax
serviceWorkerGlobalScope.onmessage = function(extendableMessageEvent) { ... };
Example
self.addEventListener('message', function(messageEvent) {
console.log('Handling message event:', messageEvent);
})
Specifications
Specification | Status | Comment |
Service WorkersThe definition of 'Event Handlers' 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 ≤79 |
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 24 |
Safari
Full support 11.1 |
WebView Android
Full support 40 |
Chrome Android
Full support 40 |
Firefox Android
Full support 44 |
Opera Android
Full support 24 |
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.
ServiceWorkerGlobalScope.onmessage by Mozilla Contributors is licensed under CC-BY-SA 2.5.