WebSocket: open event

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.

addEventListener('open', (event) => { })

onopen = (event) => { }

Event type

A generic Event.

Examples

// 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

See also