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 Workers The 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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
onmessage | Chrome Full support 40 | Edge Full support ≤79 | Firefox
Full support
44
| 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.