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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/connectionstatechange_event below:

RTCPeerConnection: connectionstatechange event - Web APIs

Baseline 2023

Newly available

The connectionstatechange event is sent to the onconnectionstatechange event handler on an RTCPeerConnection object after a new track has been added to an RTCRtpReceiver which is part of the connection. The new connection state can be found in connectionState, and is one of the string values: new, connecting, connected, disconnected, failed, or closed.

This event is not cancelable and does not bubble.

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

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

onconnectionstatechange = (event) => { }

A generic Event.

For an RTCPeerConnection named peerConnection, this example uses addEventListener() to handle changes to the connectivity of the WebRTC session. It calls an app-defined function called setOnlineStatus() to update a status display.

peerConnection.addEventListener(
  "connectionstatechange",
  (event) => {
    switch (peerConnection.connectionState) {
      case "new":
      case "connecting":
        setOnlineStatus("Connecting…");
        break;
      case "connected":
        setOnlineStatus("Online");
        break;
      case "disconnected":
        setOnlineStatus("Disconnecting…");
        break;
      case "closed":
        setOnlineStatus("Offline");
        break;
      case "failed":
        setOnlineStatus("Error");
        break;
      default:
        setOnlineStatus("Unknown");
        break;
    }
  },
  false,
);

You can also create a handler for the connectionstatechange event using the RTCPeerConnection.onconnectionstatechange property:

peerConnection.onconnectionstatechange = (ev) => {
  switch (peerConnection.connectionState) {
    case "new":
    case "connecting":
      setOnlineStatus("Connecting…");
      break;
    // …
    default:
      setOnlineStatus("Unknown");
      break;
  }
};

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