Wednesday, August 5, 2015

Thinking to build Microcontroller Programming practice website

Started looking for the web technology to build a website for microcontroller programming practice.... kind of minimal functionalities available in codeacademy.com

I am not sure whether I can start with node.js for this.

I have seen http://codemirror.net/ and ace-editor as web code editor plugins

http://techslides.com/codemirror-versus-ace-editor


looking for advise from web-programmers


Based on the code left code editor area in C or Python, the LED  connected to port should blink based on program written. The user will have the ability to write 3 or 4 lines code in Micro controller programming in each page in the editor , so that he/she will get a hands-on experience on coding as well real time experience on how LED as connected and architecture of  microcontrollers

Page prototype:


Sunday, August 2, 2015

sample routing programs with Expressjs in Node


There are some difference between express3.X and 4X in usage of app.router and bodyParser

how to avoid below errors in nodejs and expressjs

Most middleware like bodyparser is no longer bundled with Express

means you have not installed bodyparser , you have to install it as below
npm install body-parser

use this site for usage for body-Parser

https://www.npmjs.com/package/body-parser


Difference between express3.X and 4.X

https://scotch.io/bar-talk/expressjs-4-0-new-features-and-upgrading-from-3-0



App.js

ignore the commented lines in the below code

var express = require('express');
var path = require('path');
var http = require('http');
var app = express();
var bodyParser = require('body-parser');
 /*var urlencodedParser = bodyParser.urlencoded({ extended: false });*/
 app.use(bodyParser.urlencoded());
 app.set('port',process.env.PORT || 3000);
 app.set('views',__dirname + '/views');
 app.set('view engine','jade');
 /*app.use(app.router);*/
 /*var people = express.Router();*/
app.use(express.static(path.join(__dirname,'public')));

/*app.get('/about',function(req,res){
  res.send("about naveen");
 });*/
 
app.post('/user',function(req,res){
  res.send("requested user name" + req.body.name);
});
 
/*app.get('/user/:username',function(req,res){
  res.send(" "+ req.params.username + " profile");
 });*/
 /*app.get('/',function(req,res){
  res.send("hello......");
 });*/
 //app.use(express.static(path.join(__dirname, 'public')));
 var server = http.createServer(app).listen(app.get('port'),function(){
      console.log('Express server listening on port' + app.get('port'));
 });

place the file index.html in the Public folder


then start node app.js