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MDN / 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 [` {{APIRef(“WebSockets API”)}}{{AvailableInWorkers}}

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

Syntax

Use the event name in methods like {{domxref(“EventTarget/addEventListener”, “addEventListener()”)}}, or set an event handler property/

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

onopen = (event) => { }

Event type

A generic {{domxref(“Event”)}}/

Examples

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

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

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

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

Syntax

Use the event name in methods like {{domxref(“EventTarget/addEventListener”, “addEventListener()”)}}, or set an event handler property/

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

onopen = (event) => { }

Event type

A generic {{domxref(“Event”)}}/

Examples

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

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

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

Examples

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

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

Specifications

Browser compatibility

See also