Get NowJS http://www.nowjs.com/

###NowJS makes realtime web apps really easy.

Go to Github or Download the master tgz

Install From npm

npm install now or npm install now -g to install globally

NowJS is a Node.js module. The client javascript (now.js) is served by the NowJS server.

NowJS uses the excellent socket.io and node-proxy libraries.

2 Step Setup

1. On the server

var httpServer = require('http').createServer(function(req, response){ /* Serve your static files */ })
httpServer.listen(8080);

var nowjs = require("now");
var everyone = nowjs.initialize(httpServer);

everyone.now.logStuff = function(msg){
    console.log(msg);
}

2. On the client

<script type="text/javascript" src="http://localhost:8080/nowjs/now.js"></script>

<script type="text/javascript">
  now.ready(function(){
    // "Hello World!" will print on server
    now.logStuff("Hello World!");
  });
</script>

FAQ

Q: Can I pass in a callback or closure, for example, if the remote function is asynchronous?

A: Yes. This is 100% supported

Q: How do I use NowJS with Express?

A: Very easily.

var app = express.createServer();
var server = app.listen(3000);
var everyone = require("now").initialize(server);

Q: How do I disable WebSockets or only use xhr-polling?

A: You can specifiy exactly which transports to use as an initialization options as follows:

var nowjs = require("now");
var everyone = nowjs.initialize(yourHttpServer, {socketio: {transports: ['xhr-polling', 'jsonp-polling']}});

*Q: Error: " SyntaxError: Unexpected token " / Can I statically host the now.js file?

A: On the client side, make sure you link to now.js like this

 <script src="http://myserver:myport/nowjs/now.js"></script>

You do not need to host the file /nowjs/now.js. It is automatically hosted by the NowJS using the http server you pass into the .initialize(...) in your server code. If you choose to host now.js yourself, you can, but do not use the version in github repo you MUST save the file at http://myserver:myport/nowjs/now.js and host that, because it is automatically configured for your server.

Further Reading

Now that you have NowJS, try the NowJS User Manual and Quick Chat Example

Have more questions? Please contact us: Email: [email protected]

IRC: #nowjs on freenode

Twitter: @NowJSTeam