hello guys, pada post kali ini saya akan memnbahas tentang Node.JS dan membuat aplikasi chatting menggunakan platform ini :)
Node.js adalah sebuah platform dibangun di Chrome Javascript runtime easily building fast, scalable network applications. Node.js menggunakan model event-driven, non-blocking I/O yang membuatnya ringan dan efisien, cocok untuk real-time aplikasi yang berjalan di perangkat yang didistribusikan. Javascript adalah bahasa berbasis event-driven, dan Node.js menggunakan ini untuk keuntungan menghasilkan server yang scalable. Menggunakan arsitektur yang disebut event-loop. Nah berikut sedikit video persentasi Ryan Dahl :
Nah langsung aja kita mulai. Pertama -tama tentu saja silahkan download Node.JS di sini http://nodejs.org.. Sebelum mulai kita butuh node package manager(npm) yaitu Socket.IO. Apa itu Socket.IO ? berikut penjelasan singkatnya :
"Socket.IO aims to make realtime apps possible in every browser and mobile device, blurring the differences between the different transport mechanisms. It's care-free realtime 100% in JavaScript." sumber : http://socket.io
Nah sekarang langsung saja install Node.JS dan run, lalu tulis perintah ini : npm install socket.io
var app = require('http').createServer(handler)
, io = require('socket.io').listen(app)
, fs = require('fs')
var usernames={};
app.listen(9999);
function handler (req, res) {
//console.log(req);
fs.readFile(__dirname + '/index4.html',
function (err, data) {
if (err) {
res.writeHead(500);
return res.end('Error loading index.html');
}
res.writeHead(200);
res.end(data);
});
}
io.sockets.on('connection', function(socket){
console.log("Connection " + socket.id + " accepted.");
console.log(socket.handshake.foo == true); // writes `true`
console.log(socket.handshake.address.address); // writes 127.0.0.1
socket.on('adduser', function(username){
// store the username in the socket session for this client
socket.username = username;
// add the client's username to the global list
usernames[username] = socket.id;
// send client to room 1
console.log(username+' has connected to the server');
socket.broadcast.emit('updatechat', ' has connected',username);
});
// now that we have our connected 'socket' object, we can
// define its event handlers
socket.on('message', function(message){
// we tell the client to execute 'updatechat' with 2 parameters
io.sockets.emit('updatechat', message,socket.id);
console.log("Received message: " + message + " - from client " + socket.username);
});
socket.on('pmessage',function(message){
// This works and sends message to all clients
//io.sockets.emit("updatechat",message,socket.username);
console.log(usernames[message] + " " + socket.id + " to " + message);
// THIS DOESNOT
io.sockets.socket(usernames[message]).emit("updatechat","Ping" + message,socket.username);
});
socket.on('disconnect', function(){
io.sockets.emit('usersleft', socket.username);
delete usernames[socket.username];
//socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
console.log("Connection " + socket.id + " terminated.");
});
});
Selanjutnya kita buat untuk script di sisi client-nya :
<!doctype html>
<html>
<head>
<title>Socket.io Test</title>
<script src="/json.js"></script> <!-- for ie -->
<script src="/socket.io/socket.io.js"></script>
</head>
<body>
<script>
var firstconnect = true;
var socket;
function connect() {
if(firstconnect) {
socket = io.connect(null);
socket.on('message', function(data){ message(data); });
socket.on('connect', function(){
socket.emit('adduser', prompt("What's your name?"));
status_update("Connected to Server");
});
socket.on('disconnect', function(){ status_update("Disconnected from Server"); });
socket.on('reconnect', function(){ status_update("Reconnected to Server"); });
socket.on('reconnecting', function( nextRetry ){ status_update("Reconnecting in "
+ nextRetry + " seconds"); });
socket.on('reconnect_failed', function(){ message("Reconnect Failed"); });
socket.on('updatechat', function (message,socketid) {
document.getElementById('rec').innerHTML += "Socketid :" + socketid+" Broadcast says: " + message + " <br>";
//$('#conversation').append('<b>'+username + ':</b> ' + data + '<br>');
});
socket.on('usersleft', function (socketid) {
document.getElementById('rec').innerHTML += "<b>Socketid :" + socketid+" has been left</b><br>";
});
firstconnect = false;
}
else {
socket.socket.reconnect();
}
}
function disconnect() {
socket.disconnect();
}
function message(data) {
document.getElementById('message').innerHTML = "Server says: " + data;
}
function status_update(txt){
document.getElementById('status').innerHTML = txt;
}
function esc(msg){
return msg.replace(/</g, '<').replace(/>/g, '>');
}
function send() {
socket.emit('message',document.getElementById('andy').value);
};
function pingID(id)
{
socket.emit('pmessage',document.getElementById('andy2').value);
}
</script>
<h1>Socket.io Test</h1>
<div><p id="status">Not Connected</p></div>
<div><p id="message"></p></div>
<button id="connect" onClick='connect()'/>Connect</button>
<button id="disconnect" onClick='disconnect()'>Disconnect</button>
<input type="text" id="andy" />
<button id="send" onClick='send()'/>Send Message</button>
<input type="text" id="andy2" />
<button id="send" onClick='pingID()'/>pingID Message</button>
</hr>
<div><p id="rec"></p></div>
</body>
</html>
Untuk langkah terakhir mari kita jalankan script yang di atas. Silahkan ketika node <nama_file_server>
Dan simple aplikasi chatting sudah jadi :
Sumber :
http://psitsmike.com/2011/09/node-js-and-socket-io-chat-tutorial/
Node: Up and Running
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