The last feature we will implement is the ability to hang up an in-progress call. This will notify the other user of our intention to close the call and stop transmitting information. It will take just a few additional lines to our JavaScript:
hangUpButton.addEventListener("click", function () {
send({
type: "leave"
});
onLeave();
});
function onLeave() {
connectedUser = null;
theirVideo.src = null;
yourConnection.close();
yourConnection.onicecandidate = null;
yourConnection.onaddstream = null;
setupPeerConnection(stream);
};When the user clicks on the Hang Up button, it will send a message to the other user and destroy the connection locally. There are a few things required to successfully destroy the connection and also allow another call to be made in the future:
- First off, we need to notify our server that we are no longer communicating.
- Secondly, we need to tell
RTCPeerConnectionto close, and this will stop transmitting our stream data to the other user. - Finally, we tell the connection to set up again. This instantiates our connections to the open state so that we can accept new calls.
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