The message
event is fired on a Worker
object when the worker's parent receives a message from its worker (i.e. when the worker sends a message using DedicatedWorkerGlobalScope.postMessage()
).
Bubbles | No |
---|---|
Cancelable | No |
Interface | MessageEvent |
Event handler property | onmessage |
Examples
This code creates a new worker and listens to messages from it using addEventListener()
:
const worker = new Worker("static/scripts/worker.js");
worker.addEventListener('message', (event) => {
console.log(`Received message from worker: ${event.data}`)
});
Alternatively, it could listen using the onmessage
event handler property:
const worker = new Worker("static/scripts/worker.js");
worker.onmessage = (event) => {
console.log(`Received message from worker: ${event.data}`)
};
The worker posts messages using self.postMessage()
:
// static/scripts/worker.js
self.postMessage('I\'m alive!');
Specifications
Specification | Status |
---|---|
HTML Living Standard | Living Standard |
Browser compatibility
BCD tables only load in the browser
See also
- Related events:
messageerror
. DedicatedWorkerGlobalScope.postMessage()
.