javascript - implement Nodejs app in already existing website -

i want place chatroom i've crated in node.js existing website. node.js has been installed lamp server , i've tried app uploading root directory , testing works accessing typing address site followed port :3000

inside vpns www/html directory have folder called chat want become chat website.

in here have file called index.php serves me login , register page , when logged in redirected home.php, location want nodejs chat placed.

my page looks this:

the whitespace can see under blue bar place want chat appear.

so first of question how node.js application run in target area , question how make node application visible in specific area.

to make things simple i've reduced code socket.io example chat code.

var app = require('express')();  var http = require('http').server(app);  var io = require('socket.io')(http);    app.get('/', function(req, res){    res.sendfile(__dirname + '/chat.html');    //behlver itne senda html igentligen kan bara skriva hela fuckign koden     // min home.php fil tillsammans med alla scripts etc etc  });    io.on('connection', function(socket){    socket.on('chat message', function(msg){      io.emit('chat message', msg);    });  });    http.listen(3000, function(){    console.log('listening on *:3000');  });

and html document sends called chat.html looks simple this:

<div class="chatwrapper">  	<ul id="messages">  	  		  	</ul>  	<form action="">        <input id="m" autocomplete="off" /><button>send</button>      </form>  </div>    <script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>  <script src="/socket.io/socket.io.js"></script>  <script src="http://code.jquery.com/jquery-1.11.1.js"></script>  <script>    var socket = io();    $('form').submit(function(){      socket.emit('chat message', $('#m').val());      $('#m').val('');      return false;    });    socket.on('chat message', function(msg){      $('#messages').append($('<li>').text(msg));    });  </script>

i'd put iframe on chat.php page points node chat.html.

<iframe src="http://example.com:3000/chat.html"></iframe>

https://developer.mozilla.org/en-us/docs/web/html/element/iframe