CODEWITHSUNDEEP
javascriptnode.jssocketsexpresssocket.io
Romain Braun
Romain Braun

Reputation: 3684

Socket.io : Get Client sessionID at any point

I know how to retrieve the client sessionID when the user connects.

But I'd like to retrieve it at any time, for example when the client clicks on something, I would like to be able to know who clicked, what their sessionID was.

socket.sessionID doesn't work, nor does socket.handshake.sessionID

For example :

I have this express route :

.get('/result/:survey', function(req, res) {
    res.redirect('/result/'+req.params.survey+'/1');
})

Just before the redirection, I'd like to make the user join a socket room, and also get their sessionID. How could I possibly do that ? According to the doc, it would be socket.join('room') but I doubt socketonly represents the connection I have with the client, and not with the other clients. Maybe I'm just having trouble understanding sockets !

Upvotes: 7

Views: 16439

Answers (4)

Alex
Alex

Reputation: 79

I'm using socket.io version 2.0.4 and you can access the client id at any point in time by using this.id in a handler. For example:

socket.on('myevent',myhandler);
function myhandler(){
    console.log('current client id: '+this.id);
}

Apparently the handler function is executed in the Socket context itself, which similarly will give you access to other self-properties like client (connected Client object), request (current Request object being processed), etc. You can see the full API here https://socket.io/docs/server-api/#socket

Upvotes: 0

JanS
JanS

Reputation: 2075

As of version 1.0, you get the client's sessionid this way:

var socket = io();
socket.on('connect', function(){
    var sessionid = socket.io.engine.id;
    ...
});

Upvotes: 19

robertklep
robertklep

Reputation: 203241

I'm not sure exactly what you mean, because "when the client clicks on something" assumes that you mean 'client-side' (where you can use socket.socket.sessionid) but "store it in an array of clients" assumes you mean 'server-side' (where you can access it as socket.id).

Client-side:

var socket = io.connect();
socket.on('connect', function() {
  var sessionid = socket.socket.sessionid;
  ...
});

Server-side:

io.sockets.on('connection', function(socket) {
  var sessionid = socket.id;
  ...
});

Upvotes: 3

Luke W
Luke W

Reputation: 8924

I store client id's in server side event handlers simply with:

// server.js
io.sockets.on('connection', function (client) {
  client.on('event_name', function (_) {
    var clientId = this.id;
  }
}

Upvotes: 0

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