Making Websites

with JavaScript

 

Katja Durrani

@kdurrani

mail@kdurrani.co.uk

Women Who Code

Bristol

27 Jan 2015

 

Key Features

  • JavaScript outside the browser
  • Contains a library for creating a web server
  • 'Single-threaded, event-based, non-blocking I/O'
  • Suited for real-time applications
  • Modular (CommonJS style)
  • Can be extended via npm package manager

"A development platform built on top of Google's V8 JavaScript virtual machine"

What is NodeJS?

What Node is used for

  • Building APIs
  • Real-time web applications, streaming
  • Building command-line tools
  • Hard-ware hacking

Node is popular

About 90 NodeSchools world-wide!

  • Setting up a server
  • Routing
  • Providing APIs

Main uses for Express

There are some alternative frameworks (Hapi, Koa), but so far Express is the most widely used

The "Hello World" of Node and Express:

Writing a server

var express = require('express')
var app = express()

app.get('/', function (req, res) {
  res.send('Hello World!')
})

var server = app.listen(3000, function () {
  var host = server.address().address
  var port = server.address().port
  console.log('Example app listening at http://%s:%s', host, port)
})

var http = require('http'); 

http.createServer(function (req, res) { 
    res.writeHead(200, {'Content-Type': 'text/plain'}); 
    res.end('Hello World\n'); 
}).listen(8124, "127.0.0.1"); 

console.log('Server running at http://127.0.0.1:8124/');

Node

Express

JS App Workflow Considerations

Structure

Sub-directories for static files, views, routes, models etc.

Dependency Management

Usually via package manager (e.g. npm, bower, composer)

For npm:  Dependencies listed in package.json file

                    

 



npm install         // installs dependencies listed in package.json

npm install <module> --save  // installs new package, saves reference in package.json

JS App Workflow ctd.

Task Automation

Grunt, Gulp

Modularisation

Node uses  CommonJS syntax                  

 

var React = require('react');

var App = {
[...]
}

module.exports = App

You can write node-style modules for the browser, using tools like browserify which compile them for that use

Hosting

You might have to add code to your app for it to run on specific platforms (e.g. OpenShift, AWS, Heroku)

Looking at an example

Real-time Polls App built on MEAN stack

Key Features

  • Markup and display logic are combined inside nestable components
  • 'Virtual DOM and synthetic events'
  • High performance
  • One-way reactive data flow
  • Re-renders whole component on every change
  • JSX preprocessor lets you use HTML-like syntax inside JS

"A JavaScript library for building user interfaces -

the V in MVC"

What is ReactJS?

Example of React Component (before and after compilation to JS)

Playing with ReactJS

Click to get through to the sites

Thank you!

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