WebSocket: open event
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers.
The open event is fired when a connection with a WebSocket is opened.
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 Standard # dom-websocket-onopen |
Browser compatibility
BCD tables only load in the browser