DataChannel.js » A WebRTC Library for Data Sharing & WebSync as Signaling GateWay!

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How to use WebSync for Signaling?

var channel = new DataChannel();

// ------------------------------------------------------------------
// start-using WebSync for signaling
var channels = {};
var username = Math.round(Math.random() * 60535) + 5000;

var client = new fm.websync.client('websync.ashx');

client.setAutoDisconnect({
    synchronous: true
});

client.connect({
    onSuccess: function () {
        client.join({
            channel: '/chat',
            userId: username,
            userNickname: username,
            onReceive: function (event) {
                var message = JSON.parse(event.getData().text);
                if (channels[message.channel] && channels[message.channel].onmessage) {
                    channels[message.channel].onmessage(message.message);
                }
            }
        });
    }
});

channel.openSignalingChannel = function (config) {
    var channel = config.channel || this.channel;
    channels[channel] = config;

    if (config.onopen) setTimeout(config.onopen, 1000);
    return {
        send: function (message) {
            client.publish({
                channel: '/chat',
                data: {
                    username: username,
                    text: JSON.stringify({
                        message: message,
                        channel: channel
                    })
                }
            });
        }
    };
};
// end-using WebSync for signaling
// ------------------------------------------------------------------

// check existing sessions
channel.connect('channel-name');

// open new session
document.getElementById('open-new-session').onclick = function() {
    channel.open('channel-name');
};

DataChannel.js Features:

1. Direct messages — to any user using his `user-id`
2. Eject/Reject any user — using his `user-id`
3. Leave any room (i.e. data session) or close entire session using `leave` method
4. File size is limitless!
5. Text message length is limitless!
6. Size of data is also limitless!
7. Fallback to firebase/socket.io/websockets/etc.
8. Users' presence detection using `onleave`
9. Latency detection
10. Multi-longest strings/files concurrent transmission

How to use DataChannel.js?

<script src="https://www.webrtc-experiment.com/DataChannel.js"> </script>

<input type="text" id="chat-input" disabled 
       style="font-size: 2em; width: 98%;"><br />
<div id="chat-output"></div>

<script>
    var chatOutput = document.getElementById('chat-output');
    var chatInput = document.getElementById('chat-input');
    chatInput.onkeypress = function(e) {
        if (e.keyCode != 13) return;
        channel.send(this.value);
        chatOutput.innerHTML = 'Me: ' + this.value + '<hr />' 
                             + chatOutput.innerHTML;
        this.value = '';
    };
</script>

<script>
    var channel = new DataChannel('Session Unique Identifier');

    channel.onopen = function(userid) {
        chatInput.disabled = false;
        chatInput.value = 'Hi, ' + userid;
        chatInput.focus();
    };

    channel.onmessage = function(message, userid) {
        chatOutput.innerHTML = userid + ': ' + message + '<hr />' 
                             + chatOutput.innerHTML;
    };

    channel.onleave = function(userid) {
        chatOutput.innerHTML = userid + ' Left.<hr />' 
                             + chatOutput.innerHTML;
    };
</script>