Send additional data on socket connection

Question

How to best send additional data upon socket connection?

Client:

socket.on('connect',function(){  //I'd like set some values and pass them up to the node server. }); 

Node.js Server:

io.on('connection', function(client){ //I'd like to get the data here. }); 

For example sending a user name or email address etc.

Answer 1

I have a different approach - emit an event right after connecting, with the data:

socket.on('connect',function(){      // Send ehlo event right after connect:     socket.emit('ehlo', data); });  io.on('connection', function(client){     // Receive ehlo event with data:     client.on('ehlo', function(data) {     }); }); 

You can hold a variable/object, and say, when there is no ehlo event with data, the other events are ignored until ehlo is sent.

If this does not satisfy, you can send data right when connecting, I won't copy the code but it is in this answer: https://stackoverflow.com/a/13940399/1948292

Answer 2

You should send your data either in connect or on create:

var s = io('http://216.157.91.131:8080/', { query: "foo=bar" }); s.connect();  var c = io.connect('http://216.157.91.131:8080/', { query: "foo=bar" }); 

With the new version of socket.io, on server is where the things have been changed:

var io = require('socket.io')(server);  io.use(function(socket, next) {   var handshakeData = socket.request;   console.log("middleware:", handshakeData._query['foo']);   next(); });