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