RTCIceTransport: selectedcandidatepairchange event

A selectedcandidatepairchange event is sent to an RTCIceTransport when the ICE agent selects a new pair of candidates that describe the endpoints of a viable connection.

The pair of candidates is in turn described by an RTCIceCandidatePair object which contains one RTCIceCandidate representing the local end of the connection, and another representing the remote end of the connection.

Together, the candidates can be used to establish a connection to be used by the RTCIceTransport, and, by extension, by an RTCPeerConnection.

Bubbles No
Cancelable No
Interface Event
Event handler property onselectedcandidatepairchange

Examples

This example creates an event handler for selectedcandidatepairchange that updates a display providing the user information about the progress of the ICE negotiation for an RTCPeerConnection called pc.

let iceTransport = pc.getSenders[0].transport.iceTransport;
let localProtoElem = document.getElementById("local-protocol");
let remoteProtoElem = document.getElementById("remote-protocol");

iceTransport.addEventListener("selectedcandidatepairchange", ev => {
  let pair = iceTransport.getSelectedCandidatePair();
  localProtoElem.innerText = pair.local.protocol.toUpperCase();
  remoteProtoElem.innerText = pair.remote.protocol.toUpperCase();
}, false)

This can also be done by setting the onselectedcandidatepairchange event handler property directly.

let iceTransport = pc.getSenders[0].transport.iceTransport;
let localProtoElem = document.getElementById("local-protocol");
let remoteProtoElem = document.getElementById("remote-protocol");

iceTransport.onselectedcandidatepairchange = ev => {
  let pair = iceTransport.getSelectedCandidatePair();
  localProtoElem.innerText = pair.local.protocol.toUpperCase();
  remoteProtoElem.innerText = pair.remote.protocol.toUpperCase();
}

Specifications

Specification
WebRTC 1.0: Real-Time Communication Between Browsers (WebRTC 1.0)
# event-icetransport-selectedcandidatepairchange

Browser compatibility

BCD tables only load in the browser

See also