A statechange event occurs when the RTCIceTransport changes state. The state can be used to determine how far through the process of examining, verifying, and selecting a valid candidate pair is prior to successfully connecting the two peers for WebRTC communications.

This event is not cancelable and does not bubble.

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

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

onstatechange = (event) => {};

A generic Event.

Given an RTCPeerConnection, pc, the following code creates an event handler that calls a function named handleFailure() if the ICE transport enters a failure state.

let iceTransport = pc.getSenders()[0].transport.iceTransport;

iceTransport.addEventListener(
  "statechange",
  (ev) => {
    if (iceTransport.state === "failed") {
      handleFailure(pc);
    }
  },
  false,
);

The same code, using the onstatechange event handler property, looks like this:

let iceTransport = pc.getSenders()[0].transport.iceTransport;

iceTransport.onstatechange = (ev) => {
  if (iceTransport.state === "failed") {
    handleFailure(pc);
  }
};

• WebRTC API
• WebRTC connectivity

• gatheringstatechange
• selectedcandidatepairchange

• negotiationneeded
• signalingstatechange
• iceconnectionstatechange
• icegatheringstatechange
• connectionstatechange