The closing event is sent to an RTCDataChannel just before the channel begins the process of shutting down its underlying data transport.

This event is not cancelable and does not bubble.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("closing", (event) => {});

onclosing = (event) => {};

A generic Event.

While the closing event is sent to the channel just before beginning to close the channel's data transport, the close event is sent once the closing process is complete.

This example updates a connection status interface when the closing event arrives.

First, an example using addEventListener():

dataChannel.addEventListener("closing", (ev) => {
  myConnectionStatus.icon = closingIcon;
  myConnectionStatus.text = "Connection closing";
});

You can also set the onclosing event handler property directly:

pc.onclosing = (ev) => {
  myConnectionStatus.icon = closingIcon;
  myConnectionStatus.text = "Connection closing";
};

• WebRTC API
• Signaling and video calling