Socket.io : Get Client sessionID at any point
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; ...});
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; ...});
I store client id's in server side event handlers simply with:
// server.jsio.sockets.on('connection', function (client) { client.on('event_name', function (_) { var clientId = this.id; }}