How to use Express post request to emit Socket.io or Sockjs?
I know this question is kind of awkward, but the problem comes from Samsung TV 2010 / 2011 SmartTV (and blue ray player; of course 2012 emulator working fine). I ported the simple chatting examples come from the source and package to SmartTV app. Both of them fall back to JSONP polling, but from SmartTV app only could emit / push to server once. Receiving the message from server could be multiple times without any problem. After looking for the answer in Samsung D forum (of course nothing there), I think the fastest way to work around this issue is to deploy an Express server, taking the post data and JSON.parse, then emit Socket.io / Sockjs internally inside the server itself.
Could anybody show me an easy sample code so I could start from there? Thanks a lot.
I quickly make code, but seems it doesn't work:
lib/server.js
var express = require('express')
, app = express.createServer()
, io = require('socket.io').listen(app);
app.listen(80);
app.use(express.bodyParser());
app.get('/', function (req, res) {
res.sendfile('/var/www/mpgs_lite_v3/index.html');
});
app.post('/', function(req, res){
console.log(req.body);
io.sockets.emit('my other event', req.body);
res.redirect('back');
});
io.sockets.on('connection', function (socket) {
//socket.emit('news', { hello: 'world' });
socket.on('my other event', function (data) {
console.log(data);
});
});
index.html
<html>
<head>
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io.connect('http://localhost');
socket.on('news', function (data) {
console.log(data);
socket.emit('my other event', { my: 'data' });
});
</script>
</head>
<body>
<form method="post" action="/">
<input type="hidden" name="_method" value="put" />
<input type="text" name="user[name]" />
<input type="text" name="user[email]" />
<input type="submit" value="Submit" />
</form>
</body>
</html>
'my other event' seems not receive anything.
Answer
UPDATE: I updated the example for you to make it more complete. I didn't have an app.listen before, and here is also a client side script which shows that it, indeed, works fine:
<!doctype html>
<html>
<head>
<script src="//www.google.com/jsapi"></script>
<script src="/socket.io/socket.io.js"></script>
<script>google.load("jquery", "1.7.1")</script>
<script>
var socket = io.connect("localhost", {port: 3000});
socket.on("foo", function(message) { console.log("foo: ", message) });
$(function() {
$("button").click(function() {
$.post("/foo", { message: $("input").val() });
});
});
</script>
</head>
<body>
<input type=text>A message</input>
<button>Click me!</button>
</body>
</html>
And the server, now with an app.listen directive:
var express = require("express"),
app = express.createServer(),
io = require("socket.io").listen(app)
index = require("fs").readFileSync(__dirname + "/index.html", "utf8");
app.use(express.bodyParser());
app.get("/", function(req, res, next) {
res.send(index);
});
app.post("/foo", function(req, res, next) {
io.sockets.emit("foo", req.body);
res.send({});
});
app.listen(3000);
Usage:
node app.js
Navigate to http://localhost:3000/ and click the button. Check your console for output.