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.)
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.)
An array of MessagePort
objects.
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
.
js
let port; self.addEventListener("push", (e) => { const 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 = (e) => { port = e.ports[0]; };
Specification |
---|
Service Workers # extendablemessage-event-ports |
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 | 44 | No | 38 | 11.1 | 51 | 51 | 44 | 41 | 11.3 | 5.0 |
© 2005–2023 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