RTCPeerConnection.onsignalingstatechange

The onsignalingstatechange property of the RTCPeerConnection interface is an EventHandler which specifies a function to be called when the signalingstatechange event occurs on an RTCPeerConnection interface. The function receives as input the event object, of type Event; this event is sent when the value of RTCPeerConnection.signalingState changes, as the result of a call to either setLocalDescription() or setRemoteDescription().

Syntax

RTCPeerConnection.onsignalingstatechange = errorHandler;

Value

Set this to a function which you provide that receives an Event object as input; this contains the signalingstatechange event. This event object doesn't provide details about what changed, but you can examine the signalingState property to determine what the new state is.

Example

This snippet shows a handler for signalingstatechange that looks for the "have-local-pranswer" signaling state—indicating that a remote offer has been received and a local description of type "pranswer" has been applied in response.

pc.onsignalingstatechange = function(event) {
  if (pc.signalingState === "have-local-pranswer") {
    // setLocalDescription() has been called with an answer
  }
};

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
onsignalingstatechangeChrome Full support 28Edge Full support 15Firefox Full support 22IE No support NoOpera Full support 43
Notes
Full support 43
Notes
Notes Promise-based version.
No support 37 — 43
Safari Full support 11WebView Android Full support YesChrome Android Full support 28Firefox Android Full support 44Opera Android Full support 43
Notes
Full support 43
Notes
Notes Promise-based version.
No support 37 — 43
Safari iOS Full support YesSamsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support
See implementation notes.
See implementation notes.

See also