RTCPeerConnection.oniceconnectionstatechange

The RTCPeerConnection.oniceconnectionstatechange property is an event handler which specifies a function to be called when the iceconnectionstatechange event is fired on an RTCPeerConnection instance. This happens when the state of the connection's ICE agent, as represented by the iceConnectionState property, changes.

Syntax

RTCPeerConnection.oniceconnectionstatechange = eventHandler;

Value

This event handler can be set to function which is passed a single input parameter: an Event object describing the iceconnectionstatechange event which occurred. Your code can look at the value of RTCPeerConnection.iceconnectionstate to determine what the new state is.

Example

The example below watches the state of the ICE agent for a failure or unexpected closure and takes appropriate action, such as presenting an error message or attempting to restart the ICE agent.

pc.oniceconnectionstatechange = function(event) {
  if (pc.iceconnectionstate === "failed" ||
      pc.iceconnectionstate === "disconnected" ||
      pc.iceconnectionstate === "closed") {
    // Handle the failure
};

Of course, "disconnected" and "closed" don't necessarily indicate errors; these can be the result of normal ICE negotiation, so be sure to handle these properly (if at all).

Specifications

Browser compatibility

[1] Though this property is not prefixed, the interface it belongs to was until Chrome 56.

[2] Although this property isn't prefixed, the RTCPeerConnection interface is prefixed as MozRTCPeerConnection until Firefox 44.

See also

• The iceconnectionstatechange event and its type, Event.