The open event is fired when a connection with a WebSocket is opened.
The open event is fired when a connection with a WebSocket is opened.
Use the event name in methods like addEventListener(), or set an event handler property.
js
addEventListener("open", (event) => {}); onopen = (event) => {};
A generic Event.
js
// Create WebSocket connection. const socket = new WebSocket("ws://localhost:8080"); // Connection opened socket.addEventListener("open", (event) => { socket.send("Hello Server!"); });
| Specification |
|---|
| WebSockets Standard # dom-websocket-onopen |
| 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 |
5 | 12 | 7 | 10 | 12.1 | 5 | ≤37 | 18 | 7 | 12.1 | 4.2 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/open_event