For example suppose client side I have a JavaScript function
function getLocation() {
var latitude = ...;
var longitude = ...;
}
The coordinates are retrieved using a function call to Google or similar. How can I transmit this information to my Node.js server?
The easiest way? Set up Express and have your client side code communicate via Ajax (for example, using jQuery).
(function() {
var app, express;
express = require("express");
app = express.createServer();
app.configure(function() {
app.use(express.bodyParser());
return app.use(app.router);
});
app.configure("development", function() {
return app.use(express.errorHandler({
dumpExceptions: true,
showStack: true
}));
});
app.post("/locations", function(request, response) {
var latitude, longitude;
latitude = request.body.latitude;
longitude = request.body.longitude;
return response.json({}, 200);
});
app.listen(80);
}).call(this);
On the client side, you might call it like this:
var latitude = 0
, longitude = 0; // Set from form
$.post({
url: "http://localhost/locations",
data: {latitude: latitude, longitude: longitude},
success: function (data) {
console.log("Success");
},
dataType: "json"
});
Note this code is simply an example; you'll have to work out the error handling, etc.
Hope that helps.
By making an HTTP request, just like you would with any other server side program in a web application.
You could do this with the XMLHttpRequest object , or by generating a <form>
and then submitting it, or a variety of other methods.
If you need (soft) real-time capabilities, I recommend using the Socket.io library . With socket, node can also push data to your client side scripts.
I think that NowJS will be a perfect fit for you. Example:
// On the Node.JS server
var nowjs = require("now");
var everyone = nowjs.initialize(httpServer);
everyone.now.getServerInfo = function(callback){
db.doQuery(callback);
}
// In the browser
<script>
now.getServerInfo(function(data){
// data contains the query results
});
</script>
You can put variables and functions in a common namespace (ie the now
object), from the client to the server and the other way around.
I think you need RPC . The node modules section also has a section covering RPC . I think you should have a look at DNode . Have a look at the DNode on the browser section .
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