This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The read-only property
RTCPeerConnection.iceGatheringState returns an enum of type
RTCIceGatheringState that describes connection's ICE gathering state. This lets you detect, for example, when collection of ICE candidates has finished.
You can detect when the value of this property changes by watching for an event of type
var state = RTCPeerConnection.iceGatheringState;
The possible values are those of an enum of type
RTCIceGatheringState enum defines string constants which reflect the current status of ICE gathering, as returned using the
RTCPeerConnection.iceGatheringState property. You can detect when this value changes by watching for an event of type
||The peer connection was just created and hasn't done any networking yet.|
||The ICE agent is in the process of gathering candidates for the connection.|
||The ICE agent has finished gathering candidates. If something happens that requires collecting new candidates, such as a new interface being added or the addition of a new ICE server, the state will revert to "gathering" to gather those candidates.|
var pc = new RTCPeerConnection(); var state = pc.iceGatheringState;
|WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'RTCPeerConnection.iceGatheringState' in that specification.
|Working Draft||Initial specification.|
|Feature||Chrome||Edge||Firefox (Gecko)||Internet Explorer||Opera||Safari|
|Basic support||(Yes)||(Yes)||22 (22) ||No support||(Yes)||?|
|Feature||Android Webview||Chrome for Android||Edge||Firefox Mobile (Gecko)||IE Mobile||Opera Mobile||Safari Mobile|
|Basic support||(Yes)||(Yes)||(Yes)||22.0 (22) ||No support||?||?|
 Though this property is not prefixed, the interface it belongs to was until Chrome 56.
 Though this property is not prefixed, the interface it belongs to is, until Firefox 44.