socket.io.js path in nodejs with localhost in windows - node.js

Question

I have installed node.js v0.10.31 and npm v1.4.3 and also installed node-uuid, socket.io and express
I am trying to create a simple chat app, but the socket.io path i referred was so confusing. my installed socket.io path is D:\program files\nodejs\node_modules\socket.io my project files in the localhost in xampp (for php)
referred from tutorials link /socket.io/socket.io.js but my link in
D:\program files\nodejs\node_modules\socket.io\node_modules\socket.io-client\socket.io.js
how can i use to include <script src="/socket.io/socket.io.js"></script> to ??
i have two files in my projectand i copied node_modules folder to project folder from nodejs
app.js
var constants = { court: { width: 600, height: 600 },
paddle: { width: 50, height: 15, delta: 3 },
ball: { radius: 10, deltaLeft: 3, deltaTop: 2, interval: 30 }
};
var state = { paddles: {},
ball: { left: 0, top: 0 },
bottomPaddle: 0,
topPaddle: 0,
leftPaddle: 0,
rightPaddle: 0
};
var serverState = { intervalId: 0,
connections: 0
};
var app = require('http').createServer(handler),
io = require('socket.io').listen(app),
fs = require('fs');
app.listen(80);
function handler (req, res) {
fs.readFile(__dirname + '/index.html',
function readfile_callback(err, data) {
if (err) {
res.writeHead(500);
return res.end('Error loading index.html');
}
res.writeHead(200);
res.end(data);
}
);
};
function calculateBallPosition() {
var left = state.ball.left + constants.ball.deltaLeft;
var top = state.ball.top + constants.ball.deltaTop;
if (left >= constants.court.width) {
left = constants.court.width;
constants.ball.deltaLeft = -constants.ball.deltaLeft;
} else if (left <= 0) {
left = 0;
constants.ball.deltaLeft = -constants.ball.deltaLeft;
}
if (top + constants.ball.radius >= constants.court.height - constants.paddle.height) {
if (state.bottomPaddle &&
left > ( (state.paddles[state.bottomPaddle]/100) * constants.court.width - constants.paddle.width / 2) &&
(left < ( (state.paddles[state.bottomPaddle]/100) * constants.court.width + constants.paddle.width / 2) ) ) {
top = constants.court.height - constants.paddle.height - constants.ball.radius;
constants.ball.deltaTop = -constants.ball.deltaTop;
} else {
//TODO: #1
left = constants.court.width / 2;
top = constants.court.height / 2;
}
} else if (top <= 0) {
top = 0;
constants.ball.deltaTop = -constants.ball.deltaTop;
}
state.ball.left = left;
state.ball.top = top;
};
io.sockets.on('connection', function (socket) {
var paddleAdded = false;
if (!state.bottomPaddle) {
state.bottomPaddle = socket.id;
} else if (!state.topPaddle) {
state.topPaddle = socket.id;
} else if (!state.leftPaddle) {
state.leftPaddle = socket.id;
} else if (!state.rightPaddle) {
state.rightPaddle = socket.id;
} else {
// placeholder for fifth player
return;
}
state.paddles[socket.id] = 50;
socket.emit('environment', { court: { width: constants.court.width,
height: constants.court.height,
},
paddle: { width: constants.paddle.width,
height: constants.paddle.height,
delta: constants.paddle.delta
},
ball: { radius: constants.ball.radius },
player: { id: socket.id }
});
if ( !serverState.intervalId ) {
serverState.intervalId = setInterval( function(){
calculateBallPosition();
}, constants.ball.interval );
}
socket.intervalId = setInterval( function(){
socket.emit('ball', { position: { left: state.ball.left, top: state.ball.top } });
socket.emit('paddles', { positions: state.paddles, sides: {bottom: state.bottomPaddle, top: state.topPaddle, left: state.leftPaddle, right: state.rightPaddle }});
}, constants.ball.interval );
socket.on('paddle', function (data) {
state.paddles[socket.id] = data.left;
});
socket.on('disconnect', function () {
serverState.connections--;
clearInterval( socket.intervalId );
delete state.paddles[socket.id];
if (state.bottomPaddle == socket.id)
state.bottomPaddle = 0;
else if (state.topPaddle == socket.id)
state.topPaddle = 0;
else if (state.leftPaddle == socket.id)
state.leftPaddle = 0;
else if (state.rightPaddle == socket.id)
state.rightPaddle = 0;
if ( serverState.connections == 0 ) {
clearInterval( serverState.intervalId );
serverState.intervalId = 0;
}
console.log('player left');
});
console.log(serverState.connections);
serverState.connections++;
});
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
.topPlayer {
-moz-transform: rotate(180deg);
}
.leftPlayer {
-moz-transform: rotate(270deg);
}
.rightPlayer {
-moz-transform: rotate(90deg);
}
</style>
</head>
<body>
<canvas id="court"></canvas>
<script src="/socket.io/socket.io.js"></script>
<script>
var constants = { court: { width: 0, height: 0, adjusted: false },
colors: { court: "brown", ball: "black", paddle: "orange" },
paddle: { width: 0, height: 0, delta: 0 },
ball: { radius: 0 },
player: { id: 0 }
};
var state = { paddles: {},
ball: { left: 0, top: 0 },
sides: {}
};
var socket = io.connect('http://localhost/pingv1'),
canvas = document.getElementById("court"),
ctx = canvas.getContext('2d');
socket.on('environment', function(data) {
constants.court.width = data.court.width;
constants.court.height = data.court.height;
constants.paddle.delta = data.paddle.delta;
constants.paddle.width = data.paddle.width;
constants.paddle.height = data.paddle.height;
constants.ball.radius = data.ball.radius;
constants.player.id = data.player.id;
});
socket.on('paddles', function(data) {
var paddles = data.positions;
// Overwrite the server's version of my own paddle position
// if I already know where I am so I don't redraw in the old spot.
if (state.paddles[constants.player.id])
paddles[constants.player.id] = state.paddles[constants.player.id];
state.paddles = paddles;
state.sides = data.sides;
if (!constants.court.adjusted) {
constants.court.adjusted = true;
if (state.sides.top == constants.player.id)
canvas.className = 'topPlayer';
else if (state.sides.left == constants.player.id)
canvas.className = 'leftPlayer';
else if (state.sides.right == constants.player.id)
canvas.className = 'rightPlayer';
}
});
socket.on('ball', function (data) {
state.ball.left = data.position.left;
state.ball.top = data.position.top;
drawCanvas();
});
var drawCanvas = function() {
canvas.width = constants.court.width;
canvas.height = constants.court.height;
ctx.fillStyle = constants.colors.court;
ctx.fillRect(0, 0, constants.court.width, constants.court.height);
ctx.fillStyle = constants.colors.paddle;
ctx.fillRect((state.paddles[state.sides.bottom] / 100 * constants.court.width) - (constants.paddle.width / 2),
constants.court.height - constants.paddle.height, constants.paddle.width, constants.paddle.height);
ctx.fillRect((state.paddles[state.sides.top] / 100 * constants.court.width) - (constants.paddle.width / 2),
0, constants.paddle.width, constants.paddle.height);
ctx.fillRect(0, (state.paddles[state.sides.left] / 100 * constants.court.height) - (constants.paddle.height / 2),
constants.paddle.height, constants.paddle.width);
ctx.fillRect(constants.court.width - constants.paddle.height,
(state.paddles[state.sides.right] / 100 * constants.court.height) - (constants.paddle.height / 2),
constants.paddle.height, constants.paddle.width);
ctx.fillStyle = constants.colors.ball;
ctx.beginPath();
ctx.arc( state.ball.left, state.ball.top, constants.ball.radius, 0, Math.PI * 2 );
ctx.fill();
};
var movePaddle = function (delta) {
var newLeft = state.paddles[constants.player.id] + delta;
if (newLeft >= 100)
newLeft = 100;
else if (newLeft <= 0)
newLeft = 0;
if (newLeft != state.paddles[constants.player.id]) {
state.paddles[constants.player.id] = newLeft;
socket.emit('paddle', {left: state.paddles[constants.player.id] });
drawCanvas();
}
};
window.addEventListener('keydown', function onKeyDown(aEvent) {
switch (aEvent.which) {
case 37: // Left
if (state.sides.top == constants.player.id || state.sides.right == constants.player.id) movePaddle(constants.paddle.delta);
else movePaddle(-constants.paddle.delta);
break;
case 39: // Right
if (state.sides.top == constants.player.id || state.sides.right == constants.player.id) movePaddle(-constants.paddle.delta);
else movePaddle(constants.paddle.delta);
break;
}
}, false);
</script>
</body>
</html>
Getting error:
GET http://localhost:3000/socket.io/?EIO=3&transport=polling&t=1423454007198-4 net::ERR_CONNECTION_REFUSED

Answer 1

If you set up socket.io properly with your http server (you don't show us that part of your code), then it automatically handles the request for "/socket.io/socket.io.js" and serves up the socket.io.js file to the client that actually resides elsewhere. In other words, it handles it all for you by intercepting the http request for "/socket.io/socket.io.js" and serving up the desired file from it's location in the node_modules directory that the socket.io server code came from.