Client can only emit once and "force new connection" duplicates the response.

Question

Client can only emit once and "force new connection" duplicates the response.

my client side can only emit once and "force new connection" duplicates the response back to my client. here's my code so you can look it up.

server.js

var app = require('http').createServer()
, io = require('socket.io').listen(app);

app.listen(5000);


io.sockets.on('connection', function(socket) {

   socket.on('sendSheet', function(data) {
      io.sockets.emit('displayData', data);

   });

   socket.on('disconnect', function() {
      io.sockets.emit('user disconnected');
   });
});

client.js

var socket = io.connect('http://localhost:5000', {'force new connection': true});
socket.on('dispatchConnect', function (data) {
    socket.emit('sendSheet', mergedForm);
});

socket.on('displayData', function (data) {
    console.log(data);
});

node.js
socket.io

Answer 1

Read about asynchronous functions in nodejs and try to understand "the node event loop".

Your code is blocking couse your functions are synchronous .

Since an event loop runs in a single thread, it only processes the next event when the callback finishes.

You should never use a blocking function inside a callback, since you’re blocking the event loop and preventing other callbacks - probably belonging to other client connections - from being served.

Here is a async example:

var myAsyncFunction = function(someArg, callback) { // simulate some I/O was done
    setTimeout(function() {  // 1 second later, we are done with the I/O, call the callback
        callback();
    }, 1000)
}