This is documentation for the next version of K6. For the latest stable release, go to the latest version.
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