The message
event is fired on a BroadcastChannel
object when a message arrives on that channel.
The message
event is fired on a BroadcastChannel
object when a message arrives on that channel.
Use the event name in methods like addEventListener()
, or set an event handler property.
js
addEventListener("message", (event) => { }) onmessage = (event) => { }
A MessageEvent
. Inherits from Event
.
In addition to the properties listed below, properties from the parent interface, Event
, are available.
data
Read only
The data sent by the message emitter.
origin
Read only
A string representing the origin of the message emitter.
lastEventId
Read only
A string representing a unique ID for the event.
source
Read only
A message event source, which is either a WindowProxy, a MessagePort
, or a ServiceWorker
object representing the message emitter.
ports
Read only
An array of MessagePort
objects representing the ports associated with the channel the message is being sent through (where appropriate, e.g. in channel messaging or when sending a message to a shared worker).
In this example there's a "sender" <iframe>
that broadcasts the contents of a <textarea>
when the user clicks a button. There are two "receiver" iframes that listen to the broadcast message and write the result into a <div>
element.
js
const channel = new BroadcastChannel("example-channel"); const messageControl = document.querySelector("#message"); const broadcastMessageButton = document.querySelector("#broadcast-message"); broadcastMessageButton.addEventListener("click", () => { channel.postMessage(messageControl.value); });
js
const channel = new BroadcastChannel("example-channel"); channel.addEventListener("message", (event) => { received.textContent = event.data; });
js
const channel = new BroadcastChannel("example-channel"); channel.addEventListener("message", (event) => { received.textContent = event.data; });
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
message_event |
54 | 79 | 38 | No | 41 | 15.4 | 54 | 54 | 38 | 41 | 15.4 | 6.0 |
messageerror
.
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https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel/message_event