WebSocket.addEventListener(event, handler)
Set up handler functions for various events on the WebSocket connection. You can define multiple handlers for the same event.
Example
A k6 script that demonstrates how to add multiple event listeners for the WebSocket message
connection event.
import { WebSocket } from 'k6/experimental/websockets';
export default function () {
const ws = new WebSocket('ws://localhost:10000');
ws.binaryType = "arraybuffer";
ws.onopen = () => {
console.log('connected');
ws.send(Date.now().toString());
};
ws.onmessage = () => {
console.log('onmessage event handler!');
};
// Multiple event handlers on the same event
ws.addEventListener('message', () => {
console.log('addEventListener event handler!');
ws.close();
});
}
The preceding example uses a WebSocket echo server, which you can run with the following command:
$ docker run --detach --rm --name ws-echo-server -p 10000:8080 jmalloc/echo-server