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# Tips & Tricks | ||
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> RTCMultiConnection v3 tips and tricks for advance users! | ||
## `Object.observe` | ||
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`Object.observe` has been removed since `v3.2.95`. So you've to manually update-extra-data or set stream-end-handlers: | ||
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```javascript | ||
connection.extra.something = 'something'; | ||
connection.updateExtraData(); | ||
``` | ||
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## Attach External Stream | ||
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When attaching external streams: | ||
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```javascript | ||
connection.attachStreams.push(yourExternalStrea); | ||
connection.setStreamEndHandler(yourExternalStrea); | ||
``` | ||
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## Change User ID | ||
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Change userid using this method: | ||
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```javascript | ||
connection.changeUserId('your-new-userid'); | ||
``` | ||
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## ReUse Socket.io | ||
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* https://github.com/muaz-khan/RTCMultiConnection/issues/170#issuecomment-223758688 | ||
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## Record Videos | ||
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```html | ||
<script src="https://cdn.WebRTC-Experiment.com/RecordRTC.js"></script> | ||
<script> | ||
var listOfRecorders = {}; | ||
connection.onstream = function(event) { | ||
var recorder = RecordRTC(event.stream, { | ||
type: 'video', | ||
recorderType: MediaStreamRecorder | ||
}); | ||
recorder.startRecording(); | ||
listOfRecorders[event.streamid] = recorder; | ||
}; | ||
btnStopRecording.onclick = function() { | ||
var streamid = prompt('Enter stream-id'); | ||
if(!listOfRecorders[streamid]) throw 'Wrong stream-id'; | ||
var recorder = listOfRecorders[streamid]; | ||
recorder.stopRecording(function() { | ||
var blob = recorder.getBlob(); | ||
window.open( URL.createObjectURL(blob) ); | ||
// or upload to server | ||
var formData = new FormData(); | ||
formData.append('file', blob); | ||
$.post('/server-address', formData, serverCallback); | ||
}); | ||
}; | ||
</script> | ||
``` | ||
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## Record All Videos In Single File | ||
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Not Supported yet. | ||
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## Record Audio along with Screen | ||
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```javascript | ||
connection.session = { | ||
audio: true, | ||
screen: true | ||
}; | ||
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connection.onstream = function(event) { | ||
if(connection.attachStreams.length <= 1) return; | ||
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var screenStream, audioStream; | ||
connection.attachStreams.forEach(function(stream) { | ||
if(stream.isScreen) screenStream = true; | ||
if(stream.isAudio) audioSTream = true; | ||
}); | ||
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if(!screenStream || !audioStream) return; | ||
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var audioPlusScreenStream = new MediaStream(); | ||
audioPlusScreenStream.addTrack( screenStream.getVideoTracks()[0] ); | ||
audioPlusScreenStream.addTrack( audioStream.getAudioTracks()[0] ); | ||
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var recorder = RecordRTC(audioPlusScreenStream, { | ||
type: 'video', | ||
recorderType: MediaStreamRecorder | ||
}); | ||
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recorder.startRecording(); | ||
}; | ||
``` | ||
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## Share RoomID in the URL | ||
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There are two possible methods: | ||
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1. Share room-id as URL-hash | ||
2. Share room-id as URL-query-parameters | ||
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```javascript | ||
var roomid = 'xyz'; | ||
connection.open(roomid, function() { | ||
var urlToShare = 'https://yourDomain.com/room.html#' + roomid; | ||
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// or second technique | ||
var urlToShare = 'https://yourDomain.com/room.html?roomid=' + roomid; | ||
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window.open(urlToShare); | ||
}); | ||
``` | ||
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Now target users can read room-id as following: | ||
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```javascript | ||
if(location.hash.length > 1) { | ||
var roomid = location.hash.replace('#', ''); | ||
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// auto join room | ||
connection.join(roomid); | ||
} | ||
``` | ||
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Or read URL-query-parameters: | ||
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```javascript | ||
(function() { | ||
var params = {}, | ||
r = /([^&=]+)=?([^&]*)/g; | ||
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function d(s) { | ||
return decodeURIComponent(s.replace(/\+/g, ' ')); | ||
} | ||
var match, search = window.location.search; | ||
while (match = r.exec(search.substring(1))) | ||
params[d(match[1])] = d(match[2]); | ||
window.params = params; | ||
})(); | ||
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if(params.roomid) { | ||
// auto join room | ||
connection.join(params.roomid); | ||
} | ||
``` | ||
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If you want to hide HTML for non-moderators or for users that are MERELY expected to join a room: | ||
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```javascript | ||
if(params.roomid || location.hash.length > 1) { // whatever condition suits you | ||
$('.moderators-sections').hide(); | ||
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// or simple javascript | ||
Array.prototype.slice.call(document.querySelectorAll('.moderators-sections')).forEach(function(div) { | ||
div.style.display = 'none'; | ||
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// or | ||
div.parentNode.removeChild(div); | ||
}); | ||
} | ||
``` | ||
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PHP/ASPNET-MVC/Ruby developers can easily omit or remove those "redundant" HTML parts before serving the HTML to the browser. | ||
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Remember, both `open, join, or openOrJoin` all these methods supports second-callback-parameter, which means that either you joined or opened the room. E.g. `connection.open('roomid', successCallback);` | ||
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## Detect Presence | ||
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RTCMultiConnection v2 users should check this wiki-page: https://github.com/muaz-khan/RTCMultiConnection/wiki/Presence-Detection | ||
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v3 users should check this API (`connection.checkPresence`): | ||
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* https://github.com/muaz-khan/RTCMultiConnection/blob/master/docs/api.md#checkpresence | ||
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v3 users can get list of existing public-rooms using this API (`connection.getPublicModerators`): | ||
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* https://github.com/muaz-khan/RTCMultiConnection/blob/master/docs/api.md#getpublicmoderators | ||
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However v2 users can use `connection.onNewSession` event: http://www.rtcmulticonnection.org/docs/onNewSession/ | ||
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* https://twitter.com/WebRTCWeb i.e. @WebRTCWeb | ||
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## License | ||
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[RTCMultiConnection](https://github.com/muaz-khan/RTCMultiConnection) is released under [MIT licence](https://github.com/muaz-khan/RTCMultiConnection/blob/master/LICENSE.md) . Copyright (c) [Muaz Khan](http://www.MuazKhan.com/). |