ServiceWorkerMessageEvent
This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The ServiceWorkerMessageEvent
interface of the ServiceWorker API
contains information about an event sent to a ServiceWorkerContainer
target. This extends the default message
event to allow setting a ServiceWorker
object as the source of a message. The event object is accessed via the handler function of a message
event, when fired by a message received from a service worker.
This interface inherits from the Event
interface.
Constructor
ServiceWorkerMessageEvent.ServiceWorkerMessageEvent()
- Creates a new
ServiceWorkerMessageEvent
object instance.
Properties
Inherits properties from its parent, Event
.
ServiceWorkerMessageEvent.data
Read only- Returns the event's data. It can be any data type.
ServiceWorkerMessageEvent.origin
Read only- Returns the origin of the service worker's environment settings object.
ServiceWorkerMessageEvent.lastEventId
Read only- Represents, in server-sent events, the last event ID of the event source.
ServiceWorkerMessageEvent.source
Read only- Returns a reference to the service worker that sent the message.
ServiceWorkerMessageEvent.ports
Read only- Returns an array of
MessagePort
objects.
Methods
Inherits methods from its parent, Event
.
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); handleChannelMessage(e.data); } mySW = reg.active; mySW.postMessage('hello', [channel.port2]); });
Specifications
Specification | Status | Comment |
---|---|---|
Service Workers The definition of 'ServiceWorkerMessageEvent' in that specification. |
Working Draft | Initial definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 45.0 | 44.0 (44.0)[1] | No support | 24 | No support |
Feature | Android | Android Webview | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|---|
Basic support | No support | No support | (Yes) | (Yes) | No support | ? | No support | 45.0 |
[1] Service workers (and Push) have been disabled in the Firefox 45 Extended Support Release (ESR.)
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/serviceworkermessageevent