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node.js request handler wont call a function

i am taking first steps in node.js and came across an issue when trying to rout request my server receives.
i have the following files in my project, all in the same level of hierarchy:
server.js:
var http = require('http');
var url = require('url');
function start(route,handle){
function onRequest(request, response) {
var pathname = url.parse(request.url).pathname;
console.log("Request for " + pathname + " received");
route(handle,pathname);
response.writeHead(200, {"Content-Type": "text/plain"});
response.write("Hello World");
response.end();
}
http.createServer(onRequest).listen(8888);
console.log("Server has started.")
}
exports.start = start;
requestHandlers.js:
function start(){
console.log("Request handler 'start' was called");
}
function upload(){
console.log("Request handler 'upload' was called");
}
exports.start = start;
exports.upload = upload;
router.js:
function route(handle,pathname){
console.log("About to route a request for" + pathname );
if (typeof handle[pathname] === 'function'){
handle[pathname];
} else {
console.log('No request handler found for' + pathname);
}
}
exports.route = route;
and the last one is index.js:
var server = require('./server');
var router = require('./router');
var requestHandlers = require('./requestHandlers');
var handle = {};
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
server.start(router.route,handle);
when i type in my browser the URL "localhot:8888/start" for example, i get this in the console:
Server has started.
Request for /upload received
About to route a request for/upload
Request for /favicon.ico received
About to route a request for/favicon.ico
No request handler found for/favicon.ico
but why want i see the console.log i expected to see from the upload() or start()functions?
thx!

It could be because you never invoke your start or upload functions. Try adding some parentheses after handle[pathname] in router.js like this:
function route(handle,pathname){
console.log("About to route a request for" + pathname );
if (typeof handle[pathname] === 'function'){
handle[pathname]();
} else {
console.log('No request handler found for' + pathname);
}
}
exports.route = route;
Hope this helps.

node.js redirection not working to add username

I am working on a Team Treehouse project that builds a dynamic website with Node.js. The user enters in a username into the search field and it displays the user's avatar, number of badges earned and the number of JavaScript points. For some reason when I enter in the user name and click search the page just goes blank. I think there might be something wrong with the 303 redirection in my router.js file. I'm still fairly new to coding so any insight would be very helpful. Here are each of my js files.
/*****app.js file******/
var router = require('./router.js');
//Problem: We need a simple way to look at a user's badge count and JavaScript points from a web browser
//Solution: Use Node.js to perform the profile look ups and serve our templates via HTTP
//Create a web server
var http = require('http');
http.createServer(function (request, response) {
router.home(request, response);
router.user(request, response);
}).listen(3000);
console.log('Server running at http://<workspace-url>');
/*****router.js file******/
var Profile = require("./profile.js");
var renderer = require('./renderer');
var querystring = require('querystring');
var commonHeader = {'Content-Type': 'text/html'};
// Handle the HTTP route GET / and POST / i.e. Home
function home(request, response) {
//if url == "/" && GET
if (request.url === '/'){
if (request.method.toLowerCase() === "get") {
//show search
console.log(request.url);
response.writeHead(200, commonHeader);
renderer.view('header', {}, response);
renderer.view('search', {}, response);
renderer.view('footer', {}, response);
response.end();
}
else {
//if url == "/" && POST
//get the post data from body
request.on('data', function(postBody){
//extract the username
var query = querystring.parse(postBody.toString());
//redirect to /:username
response.writeHead(303, {'Location': '/' + query.username });
response.end();
});
}
}
}
// Handle the HTTP route for GET /:username i.e. /chalkers
function user(request, response) {
//if url == "/...."
var username = request.url.replace('/', '');
if(user.name.length > 0){
response.writeHead(200, commonHeader);
renderer.view('header', {}, response);
//get json from Treehouse
var studentProfile = new Profile(username);
//on "end"
studentProfile.on("end", function(profileJSON){
//show profile
//Store the values which we need
var values = {
avatarUrl: profileJSON.gravatar_url,
username: profileJSON.profile_name,
badges: profileJSON.badges.length,
javascriptPoints: profileJSON.points.JavaScript
}
//Simple response
renderer.view('profile', values, response);
renderer.view('footer', {}, response);
response.end();
});
//on "error"
studentProfile.on("error", function(error){
//show error
renderer.view('error', {errorMessage: error.message}, response);
renderer.view('search', {}, response);
renderer.view('footer', {}, response);
response.end();
});
}
}
module.exports.home = home;
module.exports.user = user;
/*****profile.js file*******/
var EventEmitter = require("events").EventEmitter;
var http = require("http");
var util = require("util");
/**
* An EventEmitter to get a Treehouse students profile.
* #param username
* #constructor
*/
function Profile(username) {
EventEmitter.call(this);
profileEmitter = this;
//Connect to the API URL (http://teamtreehouse.com/username.json)
var request = http.get("http://teamtreehouse.com/" + username + ".json", function(response) {
var body = "";
if (response.statusCode !== 200) {
request.abort();
//Status Code Error
profileEmitter.emit("error", new Error("There was an error getting the profile for " + username + ". (" + http.STATUS_CODES[response.statusCode] + ")"));
}
//Read the data
response.on('data', function (chunk) {
body += chunk;
profileEmitter.emit("data", chunk);
});
response.on('end', function () {
if(response.statusCode === 200) {
try {
//Parse the data
var profile = JSON.parse(body);
profileEmitter.emit("end", profile);
} catch (error) {
profileEmitter.emit("error", error);
}
}
}).on("error", function(error){
profileEmitter.emit("error", error);
});
});
}
util.inherits( Profile, EventEmitter );
module.exports = Profile;
/*****renderer.js file*******/
var fs = require('fs');
function mergeValues(values, content) {
//Cycle over the keys
for(var key in values) {
//Replace all the {{key}} with the value from the values object
content = content.replace('{{' + key + '}}', values[key]);
}
//return merged content
return content;
}
function view(templateName, values, response) {
//Read from the template file
var fileContents = fs.readFileSync('./views/' + templateName + '.html', {encoding: 'utf8'});
//Insert values in to the content
fileContents = mergeValues(values, fileContents);
//Write out the contents to the response
response.write(fileContents);
}
module.exports.view = view;

Treehouse changed from http to https and so this example code doesn't work any longer. The reason for that is in the profile.js file. You are making calls for an http site and it doesn't exist. You need to change the code (only in profile.js) to make it connect to the https site instead.
var http = require("http");
should be changed to
var https = require("https");
and with that all references to the variable in your profile.js code should be changed to https.
As well as the hard-coded URL start:
var request = http.get("http://teamtreehous...
should be
var request = https.get("https://teamtreehous...
That should resolve the problem. Good luck!

In order to get your code in the profile.js file to run, you need to change some instances of the "http" module to "https" but, and this is important, not all instances.
What needs to remain http is the the status code error on the profile.js page. This line of code is correct:
profileEmitter.emit("error", new Error("There was an error getting the profile for " + username + ". (" + http.STATUS_CODES[response.statusCode] + ")"));
But all other instances of the http module need to change to https. For example, these lines are correct:
var url = "https://teamtreehouse.com/" + username + ".json";
var request = https.get(url, function(response){
Remember to require both modules at the top of profile.js page
var http = require("http");
var https = require("https");

Static HTTP File Server in NodeJs: Sometimes external .js and .css files load properly, sometimes they don't?

Edit: I know using express or whatever would be easier, but this is all a learning exercise, so sorry if this is all massively convoluted, haha!
Edit 2: It appears (after adding a few console logs for debugging) that it seems the problem has something to do with the fact that when the browser makes one request to the server (say, for style.css), it makes another request (e.g. for login-fail.js) before completing the response for the first request. It seems these multiple requests from the browser cause some sort of problem, each subsequent request preventing the previous from completing. Yikes, I need help.
Edit 3: After some debugging, it appears that the pathname variable does not change its value upon each request. For some reason, pathname's value persists over each request and this makes every request's response the same - stranger still, the value for uri changes over each request (and the uri is what gives the pathname its value...) still trying to find out why this bizarre behaviour is happening.
So I've been having this problem when the server makes requests for external .js and .css files linked to specific .html files. The responses are always inconsistent. For instance, sometimes the code will run perfectly, other times the css will load and not the js, sometimes both, sometimes neither. I am not able to determine whether this is because my code is synchronous, or for some other reason. Here is my code:
Server.js
//Module requires
var http = require("http"),
fs = require("fs"),
path = require('path'),
url = require('url'),
invoke = require("./invoke");
//Object "MIMETYPES"
//Maps relationships between file extensions and their respective MIME Content-Types
var MIMETYPES = {
".html": "text/html",
".jpeg": "image/jpeg",
".jpg": "image/jpeg",
".png": "image/png",
".js": "text/javascript",
".css": "text/css"
};
//Object "invokeOptions"
//Options passed to Invoke() function for POST requests
var invokeOptions = {
postData : "",
uri : ""
}
var PORT = 8888;
//HTTP Server Begin
http.createServer(function(req, res) {
var uri = url.parse(req.url).pathname;
pathname = path.resolve(__dirname, "..") + uri;
console.log("Recieved " + req.method + " request for : " + uri);
invokeOptions.uri = uri;
//GET requests wrapper
if (req.method == "GET"){
//Invoke() function handler for GET requests
if (path.extname(pathname) == ""){
invoke.invoke(invokeOptions, req, res);
return;
}
//Static file server for GET requests
fs.exists(pathname, function(exists) {
if(!exists) {
console.log("Requested file \'" + pathname + "\' doesn't exist.");
res.writeHead(404, {'Content-Type': 'text/plain'});
res.write('404 Not Found\n');
res.end();
return;
}
var contentType = MIMETYPES[path.extname(pathname)];
res.writeHead(200, {"Content-Type" : contentType});
console.log("Current URI: " + uri + " has content type: " + contentType);
fs.createReadStream(pathname).pipe(res);
return;
});
}
//POST requests wrapper
if (req.method == "POST"){
var postData = "";
req.on("data", function(postPacket) {
postData += postPacket;
});
req.on("end", function() {
invokeOptions.postData = postData;
invoke.invoke(invokeOptions, req, res);
return;
});
}
}).listen(PORT);
console.log ("Server listening on port: " + PORT);
Invoke.js - This handles requests for non-files, that is requests for functions on the server
var fs = require("fs"),
querystring = require("querystring"),
path = require("path");
function invoke (options, req, res){
process.stdout.write("Invoking function --> ");
if (options.uri == "/"){
console.log("Index");
res.writeHead(200, {"Content-Type" : "text/html"});
fs.createReadStream("../index.html").pipe(res);
return;
}
if (options.uri == "/login"){
console.log("Login");
fs.readFile(path.resolve("../users.json"), "UTF-8", function(err, data){
if (err) throw err;
var json = JSON.parse(data);
var user = querystring.parse(options.postData).username,
password = querystring.parse(options.postData).password;
console.log("Submitted Username: " + user + "\nSubmitted Password: " + password);
if (json.users[0].username == user && json.users[0].password == password){
res.writeHead(200, {"Content-Type" : "text/html"});
fs.createReadStream("../app.html").pipe(res);
return;
}
else {
res.writeHead(300, {"Content-Type" : "text/html"});
fs.createReadStream("../login-fail.html").pipe(res);
return;
}
});
}
else {
console.log("Error! Bad request.");
res.writeHead(400, {"Content-Type" : "text/plain"});
res.end("Error 400: Bad Request. \nThere is no function corresponding to that request.");
}
}
exports.invoke = invoke;
Login-fail.js - This is the code that hardly ever loads
$(document).ready(function() {
var current = 3;
var countdown = $(".countdown");
function down (){
current--;
if (current != 0){
countdown.text(current);
}
else {
clearInterval(interval);
window.location.replace("./");
}
}
var interval = setInterval(down, 1000);
});
Basically, the index.html file is a form which accepts a username and password, compares the submitted POST data to a json file, and if it matches the hashes in the json file it requests app.html, otherwise it requests login-fail.html. When the login-html file is called, it has linked to it css and js which when requested hardly ever run!
Also, I thought it should be noted that the console.logs for "content-type" when requesting the css is 'text/javascript' when it doesn't work. Any help would be massively appreciated!

Holy crap.
Pathname wasn't being declared as a variable each request, because I used a ; instead of a ,
I'll go die now ladies and gents.

The relative paths you're using in your login-fail.html are probably not resolving correctly because the URL path doesn't change (/login), so the browser is looking for /login/css/style.css and /login/js/login-fail.js. Try modifying your login-fail.html to use absolute paths instead of relative paths.

Node.js request data event not firing. What am I doing wrong?

It seems like the data event on the request object is not firing, or I can't wire it up right in order to get anything from it. I am getting the end event just fine, and all the urls are working. I have looked on forums and documentation, and when I look at my code it seems like it should work. I am using Node version 0.10.12.
I am new. I am trying to get a simple server going in node. I was following The Node Beginner Book. Most of this code comes from there, with some very small modifications. I have already tried the code straight from the book.
Here is the code I am working with now.
index.js
var server = require("./server");
var router = require("./router");
var requestHandlers = require("./requestHandlers");
var handle = {};
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
if (process.argv[2] !== undefined && process.argv[2] !== null) {
server.start(router.route, handle, process.argv[2]);
} else {
server.start(router.route, handle);
}
router.js
route = function(handle, pathname, response, postData) {
if (typeof handle[pathname] === "function") {
handle[pathname](response, postData);
} else {
response.writeHead(404, {"Content-Type": "text/plain"});
response.end("404 Not found");
}
}
exports.route = route;
server.js
var http = require('http');
var url = require('url');
var portToUse = 8888;
start = function(route, handle, port) {
if (port !== undefined && port !== null && typeof parseInt(port) === 'number' && port > 1000 && port < 10000) {
console.log('You passed in the port number %d.', port);
portToUse = port;
}
http.createServer(function(request, response) {
var postData = '';
var pathname = url.parse(request.url).pathname;
console.log('Request for %s received.', pathname);
route(handle, pathname, response);
request.setEncoding('utf8');
// I have tried both .on and .addListener
request.on('data', function(postDataChunk) {
postData += postDataChunk;
console.log('Received POST data chunk %s.', postData);
});
request.on('end', function(postDataChunk) {
console.log(postDataChunk);
route(handle, pathname, response, postData);
});
}).listen(portToUse);
console.log('The server listening on %d.', portToUse);
}
exports.start = start;
requestHandlers.js
var exec = require('child_process').exec;
start = function(response, postData) {
var body = '<!doctype html>' +
'<html lang="en">' +
'<head>' +
'<meta charset="UTF-8">' +
'<title>Upload Server</title>' +
'</head>' +
'<body>' +
'<form action="/upload">' +
'<textarea name="text" id="text-area" cols="40" rows="20"></textarea>' +
'<input type="submit" value="Submit text">' +
'</form>' +
'</body>' +
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.end(body);
}
upload = function(response, postData) {
response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('You\'ve sent: ' + postData);
}
exports.start = start;
exports.upload = upload;
Thanks in advance.

You need to add your data listener before you call route. Reason being, in your handlers you are calling response.end. When you do this, node checks if there are any data listeners on the socket, and if not, it will dump the existing request data, as it figures it's no longer needed.

setting up a basic node.js server

I am trying to set up a basic node.js server and am getting an error I cannot figure out. I have 4 files: index.js, server.js, router.js, requestHandlers.js
index.js
var server = require("./server");
var router = require("./router");
var requestHandlers = ("./requestHandlers");
var handle = {}
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
server.start(router.route, handle);
server.js
var http = require('http');
var url = require("url");
function start(route, handle) {
function onRequest(request, response) {
var pathname = url.parse(request.url).pathname;
console.log("Request for " + pathname + " received"); // 2nd log-- works fine
route(handle, pathname);
response.writeHead(200, {'Content-Type': 'text/plain'});
response.write('Hello World');
response.end();
}
http.createServer(onRequest).listen(8888);
console.log("Server has started."); //1st log -- works fine
};
exports.start = start;
router.js
function route(handle, pathname) {
console.log("About to route a request for " + pathname); //3rd log -- works fine
console.log(handle); // THIS IS THE PROBLEM returns ---> { '/': undefined, '/start': undefined, '/upload': undefined }
console.log(pathname); //works fine -- returns "/"
console.log(typeof handle[pathname]); //undefined
if (typeof handle[pathname] === 'function') {
handle[pathname](); //never called because above evaluates to undefined
}
else {
console.log("No request handler found for " + pathname);
}
}
exports.route = route;
requestHandlers.js //code never gets here
function start () {
console.log("Request handler 'start' was called")
}
function upload () {
console.log("Request handler 'upload' was called")
}
exports.start = start;
exports.upload = upload;
I have gone over this 100 times and feel pretty confident about what it's doing, so hopefully there is just some small thing I am missing. thanks!

I think you accidentally forgot the verb (require).
var requestHandlers = require("./requestHandlers");