Syntax
Use the event name in methods like addEventListener(), or set an event handler property.
js
addEventListener("open", (event) => { })
onopen = (event) => { }
Event type
A generic Event.
Examples
js
// Create WebSocket connection.
const socket = new WebSocket("ws://localhost:8080");
// Connection opened
socket.addEventListener("open", (event) => {
socket.send("Hello Server!");
});
Specifications
| Specification |
|---|
| WebSockets # dom-websocket-onopen |