javascript - get room of a socket in socket.io - Stack Overflow

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How do I retrieve the rooms a socket is a member of? I'm using socket.io version 1.4

I tried with this.socket.adapter.rooms but I received this error in the chrome console: Cannot read property 'rooms' of undefined

In my client code I have this method:

send(msg) {
        if(msg != ''){
            var clientInfo = [];
            clientInfo.push(msg);
            clientInfo.push(socket.id);
            clientInfo.push(this.socket.adapter.rooms);
            socket.emit('message', clientInfo);
        }
    }

On my server side:

socket.on('message', function(clientInfo){
        var clientmessage = clientInfo[0];
        var clientid = clientInfo[1];
        var clientroom = clientInfo[2];
        io.to(clientroom).emit('messageSent', clientmessage);
    });

How do I retrieve the rooms a socket is a member of? I'm using socket.io version 1.4

I tried with this.socket.adapter.rooms but I received this error in the chrome console: Cannot read property 'rooms' of undefined

In my client code I have this method:

send(msg) {
        if(msg != ''){
            var clientInfo = [];
            clientInfo.push(msg);
            clientInfo.push(socket.id);
            clientInfo.push(this.socket.adapter.rooms);
            socket.emit('message', clientInfo);
        }
    }

On my server side:

socket.on('message', function(clientInfo){
        var clientmessage = clientInfo[0];
        var clientid = clientInfo[1];
        var clientroom = clientInfo[2];
        io.to(clientroom).emit('messageSent', clientmessage);
    });

• javascript
• node.js
• socket.io

Share Improve this question Follow edited Aug 12, 2016 at 16:08 splunk asked Aug 12, 2016 at 12:59 splunksplunk 6,8151717 gold badges6464 silver badges109109 bronze badges 6

• It's unclear what you're asking. socket.id is a unique string for each socket and also corresponds to a room name that only that socket is in. There's also a list of rooms that a given socket is a member of, but I'm not sure what exactly you're looking for? – jfriend00 Commented Aug 12, 2016 at 15:49
• "There's also a list of rooms that a given socket is a member of"... I'm searching for this. – splunk Commented Aug 12, 2016 at 15:55
• Then, please edit your question to say that's what you're looking for. And, based on your description of the error you are seeing, we need to see a lot more context for your code to understand what this.socket is. Also, there is no "single" room name that a socket might belong to as your question implies. A socket can be in many rooms. – jfriend00 Commented Aug 12, 2016 at 15:57
• And, is this code client side code or server side code? – jfriend00 Commented Aug 12, 2016 at 16:02
• The client-side socket does not know what rooms it is in. That is only server-side info. – jfriend00 Commented Aug 12, 2016 at 16:13

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2 Answers 2

Sorted by: Reset to default 5

Server side, you can get a list of rooms a socket is in with:

socket.rooms

Client side, a socket does not know what rooms it is in. The whole concept of rooms is a server-side concept and all the data structures are maintained there. If a client wanted to know what rooms it was in, it would either have to keep track of what rooms it requested to be a member of or it would have to ask the server what rooms it is in.

There is one oddity about the server-side socket.rooms structure. It is apparently not updated real-time. If you do socket.join("someRoom") and then immediately look at socket.rooms, you will not see the someRoom name listed. But, if you look on process.nextTick() or on setTimeout(), you will see it in socket.rooms. I haven't delved into the socket.io source code to figure out why that is the way it is, but apparently something is only being updated asynchronously.

            Object.keys(socket.rooms).forEach(function(room, idx) {
                if(idx!=0){
                    console.log(idx,"-->",room)
                }
             });

By the above code you can identify all the rooms the socket have joined. You can skip the first room which is in index 0 as it is the default room a socket will connect on connection.

Tested this with SocketIO 1.7 and works well.

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