ExtendableMessageEvent.ports
The ports
read-only property of the ExtendableMessageEvent
interface returns the array containing the MessagePort
objects representing the ports of the associated message channel (the channel the message is being sent through.)
Syntax
var myPorts = extendableMessageEvent.ports;
Value
An array of MessagePort
objects.
Examples
When the following code is used inside a service worker to respond to a push messages by sending the data received via PushMessageData
to the main context via a channel message, the event object of onmessage
will be a ExtendableMessageEvent
.
var port; self.addEventListener('push', function(e) { var obj = e.data.json(); if(obj.action === 'subscribe' || obj.action === 'unsubscribe') { port.postMessage(obj); } else if(obj.action === 'init' || obj.action === 'chatMsg') { port.postMessage(obj); } }); self.onmessage = function(e) { port = e.ports[0]; }
Specifications
Specification |
---|
Service Workers 1 # extendablemessage-event-ports |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
ports |
51 |
17 |
45
Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
|
No |
38 |
11.1 |
51 |
51 |
45 |
41 |
11.3 |
5.0 |
See also
© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ExtendableMessageEvent/ports