Web/API/RTCDataChannel/open event

The WebRTC open event is sent to an RTCDataChannel object's onopen event handler when the underlying transport used to send and receive the data channel's messages is opened or re-opened.

Bubbles	No
Cancelable	No
Interface	RTCDataChannelEvent
Event handler property	onopen

Examples

This example adds to the RTCDataChannel dc a handler for the open event that adjusts the user interface to indicate that a chat window is ready to be used after a connection has been established. It enables the message input box and send button as well as enabling the disconnect button and disabling the connect button. Finally, the message input box is focused so the user can immediately begin to type.

dc.addEventListener("open", ev => {
  messageInputBox.disabled = false;
  sendMessageButton.disabled = false;
  disconnectButton.disabled = false;
  connectButton.disabled = true;

  messageInputBox.focus();

}, false);

This can also be done by directly setting the value of the channel's onopen event handler property.

dc.onopen = ev => {
  messageInputBox.disabled = false;
  sendMessageButton.disabled = false;
  disconnectButton.disabled = false;
  connectButton.disabled = true;

  messageInputBox.focus();
}

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
open event	Chrome Full support 56	Edge Full support ≤79	Firefox Full support Yes	IE No support No	Opera Full support 43	Safari Full support Yes	WebView Android Full support 56	Chrome Android Full support 56	Firefox Android Full support Yes	Opera Android Full support 43	Safari iOS Full support Yes	Samsung Internet Android Full support 6.0

Legend

Full support  

Full support

No support  

No support

See also

• WebRTC API
• A simple RTCDataChannel example
• Related events: message, close, and error

RTCDataChannel: open event by Mozilla Contributors is licensed under CC-BY-SA 2.5.