Web Development with AngularJS, NodeJS and ExpressJS
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A presentation given by me during an invited lecture at FEUP. Topics covered: The MEAN Stack (MongoDB, ExpressJS, AngularJS and NodeJS NodeJS (High-performance Javascript-based runtime environment) ExpressJS (An MVC web applications framework) AngularJS (Google framework for client apps in the browser) Live coding session + questions
![Route (JS)
GET /users/all ->
function(req,res)
{
//1. Fetch from DB
User.findAll(
…
//2. Render view
res.render(
‘users/all’,
{
users : users
}
);
}
[
{
"id" : 1,
"username" : "joao",
"firstname" : "João",
"surname" : "Rocha"
}
]
<html>
<h1>Viewing users</h1>
<% for (var user in
users… )
{ %>
Username : <%=user.
username%>
First Name:
<%=users.firstname%>
<% } %>
</html>
Model Route View
Client requests http://127.0.0.1:3000/users/all
Return Object array](https://image.slidesharecdn.com/angularexpresslbaw2016-160429145718/85/Web-Development-with-AngularJS-NodeJS-and-ExpressJS-11-320.jpg)
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Web Development with AngularJS, NodeJS and ExpressJS
- 1. Laboratory of Databases and Web Applications Web development using Express, Node, Angular João Rocha da Silva (FEUP InfoLab, room I123) Contact: [email protected]
- 2. Contents 1. The MEAN Stack 2. NodeJS High-performance Javascript-based runtime environment 3. ExpressJS An MVC web applications framework 4. AngularJS Google framework for client apps in the browser 5. Live coding session + questions
- 3. Javascript across the whole stack Image from https://codegeekk. wordpress.com/2015/03/07/explore- mean-stack-at-2015/
- 4. NodeJS
- 5. NodeJS ● JavaScript “on the server side” ● Built on Google’s Chrome V8 Javascript engine ○ Compiles JavaScript code to native machine code instead of interpreting in real time ● Vibrant open-source community ○ Huge ecosystem of free libraries
- 6. NodeJS (continued) ● Single thread, event-driven ○ Asynchronous, nonblocking I/O (i.e. not blocking the main thread) ○ Numerous & simultaneous I/O operations become faster ● Very low memory consumption vs PHP, for example ○ Single process ○ Many more simultaneous connections per server instance ○ Node sleeps when there is nothing to be done ● Multicore support also available for clusters In https://nodejs.org/en/about/ http://blog.soulserv.net/tag/node-js-vs-php/
- 7. // Load the http module to create an http server. var http = require('http'); // Configure our HTTP server to respond with Hello World to all requests. var server = http.createServer(function (request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.end("Hello Worldn"); }); // Listen on port 8000, IP defaults to 127.0.0.1 server.listen(8000); // Put a friendly message on the terminal console.log("Server running at http://127.0.0.1:8000/"); In https://nodejs.org/en/about/
- 8. ExpressJS
- 10. id username firstname surname 1 joao João Rocha Example: Listing all users Database table
- 11. Route (JS) GET /users/all -> function(req,res) { //1. Fetch from DB User.findAll( … //2. Render view res.render( ‘users/all’, { users : users } ); } [ { "id" : 1, "username" : "joao", "firstname" : "João", "surname" : "Rocha" } ] <html> <h1>Viewing users</h1> <% for (var user in users… ) { %> Username : <%=user. username%> First Name: <%=users.firstname%> <% } %> </html> Model Route View Client requests http://127.0.0.1:3000/users/all Return Object array
- 12. Database Querying API Model instancesModel Object-Relational Mapping (ORM) for NodeJS ● User “Class” “One for each DB table” ● Instances “One for each table row”
- 13. Sequelize is a promise-based ORM for Node.js and io. js. It supports the dialects PostgreSQL, MySQL, MariaDB, SQLite and MSSQL and features solid transaction support, relations, read replication and more. Sequelize API Docs: http://docs.sequelizejs. com/en/latest/api/model/#findalloptions- promisearrayinstance
- 14. Lots of libraries on the ecosystem Package manager for the web CSS, JS, HTML, Images... Bower Package manager for NodeJS Libraries Node Package Manager
- 15. AngularJS
- 16. AngularJS ● HTML is good for presenting information ○ But NOT good for storing it ● jQuery uses the DOM to store information, and you need to set and get by element ID (usually) ○ Huge side effects as the code grows and different parts of the web page are modified at the same time by many events ○ Harder and harder to debug and maintain ● No one likes to maintain spaghetti code...
- 17. ● Angular separates business logic and data from the presentation ○ Services and Factories for data access and storage ○ Views for presentation ○ Controllers are the “glue” between data and presentation ○ Routes switch between Views (Single Page Application) AngularJS (cont’d)
- 19. AngularJS + ExpressJS are good friends ● Excellent for supporting Mobile Apps + Web site ○ Implement a single JSON-based API ○ Consume JSON on mobile devices ○ Same JSON can be used to generate HTML on the client ○ No need to test two separate APIs, because the site itself uses the “mobile” API
- 21. Code for this presentation available at https://github.com/silvae86/lbaw_2016_tutorial João Rocha da Silva is just finishing an Informatics Engineering PhD at FEUP. He specializes on research data management, applying the latest Semantic Web Technologies to the adequate preservation and discovery of research data assets. He is experienced in many programming languages (Javascript-Node, PHP with MVC frameworks, Ruby on Rails, J2EE, etc etc) running on the major operating systems (everyday Mac user). Regardless of language, he is a quick learner that can adapt to any new technology quickly and effectively.