WebSocket: open event

The open event is fired when a connection with a WebSocket is opened.

Bubbles No
Cancelable No
Interface Event
Event handler property onopen

Examples

// Create WebSocket connection.
const socket = new WebSocket('ws://localhost:8080');

// Connection opened
socket.addEventListener('open', (event) => {
  socket.send('Hello Server!');
});

Specifications

Specification
HTML Standard (HTML)
# event-open

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
open_event
4
12
7
10
12.1
5
≤37
18
7
12.1
4.2
1.0

See also

© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/open_event