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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
open eventChrome Full support 56Edge ? Firefox Full support YesIE No support NoOpera Full support 43Safari ? WebView Android Full support 56Chrome Android Full support 56Firefox Android Full support YesOpera Android Full support 43Safari iOS No support NoSamsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

Contributors to this page: mdnwebdocs-bot, Sheppy
Last updated by: mdnwebdocs-bot,