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luk-/index.html

Created October 30, 2011 00:14
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Broadcasting with socket.io
Raw
index.html
<!DOCTYPE html>
<head>
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io.connect('/');
socket.on('bc', function (data) {
console.log(data);
window.document.write(data.bc + '<br />');
});
socket.on('dc', function (data) {
console.log(data);
window.document.write(data.bc + '<br />');
});
</script>
</head>
<body></body>
</html>
Raw
server.js
var app = require('http').createServer(handler);
var io = require('socket.io').listen(app);
var fs = require('fs');
app.listen(80);
function handler (req, res) {
fs.readFile(__dirname + '/index.html',
function (err, data) {
if (err) {
res.writeHead(500);
return res.end('Error 500');
}
res.writeHead(200);
res.end(data);
});
}
var users_connected = {
base: 0,
_add: function (callback)
{
this.base++;
callback(this.base);
},
_sub: function (callback)
{
this.base--;
callback(this.base);
}
}
io.sockets.on('connection', function (socket) {
users_connected._add(function(num){
socket.broadcast.emit('bc', { bc: num });
});
socket.on('disconnect', function () {
users_connected._sub(function(num){
socket.broadcast.emit('dc', { bc: num });
});
});
});
@luk-
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Author

luk- commented Oct 30, 2011

This is a simple example of how socket.io's broadcasting feature functions. Each time an instance of the page is opened or closed on a global level (after the first), it's written to the page.

Example: luk.no.de

Try opening up multiple instances of the page, then watch the first while you close the other tabs.

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