MDN Web Docs

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

Browser compatibility

See also

Help improve MDN

Yes No

Learn how to contribute

This page was last modified on by MDN contributors.

Read the original on developer.mozilla.org ↗