Question

I am trying to connect many socket.io clients for different URLs in Node.js like so :

app.get('/:id',function(req,res){
io.of('/'+id).on('connection',function(socket){
    socket.emit('hello');

})
});

This works however there is a problem :

When a browser refreshs the page http://localhost:3000/xyz for example, the event socket.emit gets fired two times.

If someone accesses the page http://localhost:3000/xyz 10 times, then the event fires 10 times.

This is not good because everytime the user visits that page, the socket events will be fired n+1 times.

What should be done so that I can register sockets to different URLs and at the same time not have this anomaly .

Another thing :

If I do this :

var sock;

io.of('/'+xyz).on('connection',function(socket){
    sock=socket;

})


app.get('/:id',function(req,res){
    sock.emit('hello');

})

If I use the above code then the socket doesn’t get saved succesfully to the sock variable in time. What that means is , I have to do a setInterval of about 1000 .. so that the

sock=socket 

line gets fired.

Please help me.

Answer 1

Because with this, in each request to http://localhost:3000/id, you register a new handler, you should be doing that once, not at every request.

app.get('/:id',function(req,res){
    io.of('/'+id).on('connection',function(socket){
        socket.emit('hello');

    })
});