RTCIceTransport: statechange event

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.

Bubbles No
Cancelable No
Interface Event
Event handler property RTCIceTransport.onstatechange


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") {
}, 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") {


Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'statechange' in that specification.
Candidate Recommendation

Browser compatibility

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See also