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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Intro to Node.js ~ Girl Develop It</title>
<meta name="description" content="An introduction to Node.js">
<meta name="author" content="Girl Develop It">
<meta name="apple-mobile-web-app-capable" content="yes" />
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link.rel = 'stylesheet';
link.type = 'text/css';
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<!-- If use the PDF print sheet so students can print slides-->
<link rel="stylesheet" href="css/print/pdf.css" type="text/css" media="print">
<link rel="icon" type="image/x-icon" href="favicon.ico" />
<style>
.reveal section img {
box-shadow: none;
}
</style>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<!-- Opening -->
<section>
<img src="img/circle-gdi-logo.png" alt="GDI Logo" />
<h3>Intro to Node.js Part 2</h3>
</section>
<section>
<h2>The plan</h2>
<ul>
<li>Review last session</li>
<li>MVC overview</li>
<li>APIs!!</li>
</ul>
</section>
<section>
<h2>Node REPL</h2>
</section>
<section>
<h3>Node REPL</h3>
<ul>
<li class="fragment">Read Evaluate Print Loop</li>
<li class="fragment">What happens when you type "node"!</li>
<li class="fragment">Use it to run JS</li>
<li class="fragment">AND you have access to your current node_modules</li>
</ul>
</section>
<section>
<pre>
<code contenteditable class ="javascript">
$ node
> 1 + 2
3
> const express = require('express');
...
> .exit
</code>
</pre>
</section>
<section>
<h2>HTTP Server Basics: Request/Response</h2>
</section>
<section>
<h2>Examples of HTTP requests:</h2>
<ul>
<li class="fragment">GET</li>
<li class="fragment">PUT</li>
<li class="fragment">POST</li>
<li class="fragment">DELETE</li>
<li class="fragment"><a href="https://www.w3.org/Protocols/rfc2616/rfc2616.txt">Behold the holy RFC for more about the HTTP protocol</a></li>
</ul>
</section>
<section>
<h2>And responses?</h2>
<p>They're what you get back from a request 😎</p>
</section>
<section>
<h2>Routes</h2>
<p>"Routes" define how a server should respond to a certain request at a certain end point or path.</p>
<pre>
<code contenteditable class ="javascript">
// app.<HTTP action>
app.get('/', function (req, res) {
res.send('Hello World!');
});
</code>
</pre>
</section>
<section>
<h2>MVC</h2>
<ul>
<li>Model: Data</li>
<li>View: UI</li>
<li>Controller: Switchboard</li>
</ul>
</section>
<section>
<img src="img/MVC.png" />
</section>
<section>
<h2>Controllers</h2>
<p>Our controllers <em>mediate</em> communication between our models and views</p>
</section>
<section>
<h2>Our Home Controller</h2>
<pre>
<code contenteditable class ="javascript">
exports.index = function (req, res) {
res.send('Welcome to the GDI Node Workshop!');
}
</code>
</pre>
</section>
<section>
<h2>Did you realize, our controller is a <em>Node module</em>?</h2>
</section>
<section>
<img src="img/bananadance.gif" />
</section>
<section>
<h2>Node Modules</h2>
<p>A node module is a file, and it exposes things to the outside world with <code>exports</code>
</section>
<section>
<h2>Our Home Controller</h2>
<pre>
<code contenteditable class ="javascript">
exports.index = function (req, res) {
res.send('Welcome to the GDI Node Workshop!');
}
</code>
</pre>
</section>
<section>
<h2>How do we use a module?</h2>
<pre>
<code contenteditable class ="javascript">
var express = require('express');
// var nameWeUseInOurApp = require('someModule');
</code>
</pre>
</section>
<section>
<h2>How our app integrates with our controller</h2>
<pre>
<code contenteditable class ="javascript">
// Tell app.js about the home controller using require
// Node how the ./ tells node to look in our own folder structure vs node_modules
var homeController = require('./controllers/home');
// Routes
app.get('/', homeController.index);
</code>
</pre>
</section>
<section>
<h3>Let's Develop It!<sup>3</sup></h3>
<ul>
<li>Create a new <code>home.js</code> file in a <code>controllers</code> folder.</li>
<li>Move your root route to <code>home.js</code></li>
<li>Update <code>app.js</code> to use your controller.</li>
<li><strong>BONUS</strong>: Add a <code>/*</code> route as a catch-all displays a 404 message.</li>
<li><strong>BONUS</strong>: Create a new route in your home controller for <code>/about</code></li>
</ul>
</section>
<section>
<h2>Templates</h2>
<p>Pass data through to your view</p>
</section>
<section>
<h2>Tell our controller about templates</h2>
<pre>
<code contenteditable class ="javascript">
var path = require('path');
exports.index = function (req, res) {
res.sendFile(path.join(__dirname, '../public', 'templates', 'index.html'));
}
</code>
</pre>
</section>
<section>
<h2>What about CSS? And images?</h2>
<p>We need to tell Express which files we allow the user to access</p>
</section>
<section>
<h2>Add static files to our app</h2>
<pre>
<code contenteditable class ="javascript">
// Serve static files (i.e. images, scripts, styles, templates) from public/ directory
app.use(express.static('public'));
</code>
</pre>
</section>
<section>
<h3>Let's Develop It!<sup>4</sup></h3>
<ul>
<li>Update your home controller to load a template, <code>index.html</code></li>
<li>Create a new route in your home controller for <code>/about</code> if you haven't yet</li>
<li>Associate <code>/about</code> with a new template</li>
<li>Add static assets capability to your app</li>
<li><strong>BONUS</strong>: Add a CSS file and style your page!</li>
</ul>
</section>
<section>
<h2>Jade/Pug View Engine</h2>
<p>Because writing HTML can be a lot! And view engines are great!</p>
<p><a href="http://jade-lang.com/">Check out Pug (formerly known as Jade)'s site for examples and an interactive playground</a></p>
<pre>
<code contenteditable class ="javascript">
// template.pug
h1 Welcome
a(href="somewhere.com") Some cool link!
</code>
</pre>
</section>
<section>
<h2>Pug</h2>
<p>Install & Use Pug</p>
<pre>
<code contenteditable class ="javascript">
npm install --save pug
// in app.js
app.set('view engine', 'pug');
</code>
</pre>
</section>
<section>
<h2>Pug</h2>
<p>Use <code>res.render</code> to use your view engine</p>
<pre>
<code contenteditable class ="javascript">
exports.about = function (req, res) {
res.render('about');
}
</code>
</pre>
</section>
<section>
<h2>How'd it get the file?</h2>
<p>Since we put our <code>about.pug</code> file in <code>views/</code> Express knows where that is and assumes that's what we mean when we say <code>render</code></p>
</section>
<section>
<h2>One more thing! Develop faster!</h2>
<p><code>npm install --save-dev nodemon</code> and update your <code>package.json</code> to use nodemon to run <code>app.js</code>. It will live reload so you don't have to start/stop your server!</p>
</section>
<section>
<h3>Let's Develop It!<sup>5</sup></h3>
<ul>
<li>Install Pug</li>
<li>Add some <code>.pug</code> views to a <code>views</code> folder</li>
<li>Update your routes to use res.render</li>
</ul>
</section>
<section>
<h2>APIs!</h2>
<p>Application Programming Interface</p>
<p class="fragment">AKA computers talk to each other</p>
</section>
<section>
<h2>APIs</h2>
<p>APIs allow us to request data from a service</p>
<p>Some APIs you might want to use</p>
<ul>
<li>Meetup <a href="https://secure.meetup.com/meetup_api/console/">(api console)</a></li>
<li>Twitter</li>
<li>Facebook</li>
</ul>
</section>
<section>
<h2>We can also build our own!!</h2>
</section>
<section>
<h3>Let's Develop It!<sup>6</sup></h3>
<ul>
<li>Download our <a href="https://github.com/dariusk/corpora/blob/master/data/animals/dinosaurs.json">"database" of dinosaurs</a></li>
<li>Create an api controller</li>
<li>Present all the dinosaurs at <code>/api/all</code></li>
<li>Show a dinosaur based on its index in the dinosaurs array at <code>/api/get/:id</code> where id is the index of the dinosaur</li>
<li>Consume your API to create a RDaaS (Random Dinosaur as a Service) page!</li>
</ul>
</section>
<section>
<h2>What we've learned in this course</h2>
<ul>
<li>What is Node</li>
<li>What is npm</li>
<li>Used an npm module</li>
<li>Built a web server</li>
<li>Wrote a Node module</li>
<li>Wrote an API endpoint</li>
</ul>
</section>
<section>
<h2>Where do we go from here?</h2>
<ul>
<li>Import Node modules (browse npm for some ideas) and do some things!</li>
<li>Use a database like <a href="https://www.mongodb.com/">MongoDB</a> or a service like <a href="https://firebase.google.com/">Firebase</a></li>
<li>Deploy your app to Heroku!</li>
</ul>
</section>
<section>
<h1>THE END</h1>
<h3>Don't forget to take the end-of-class survey!</h3>
<p>Exercise solutions at <a href="https://github.com/pselle/Intro-to-Node.js-Exercises" alt="Exercises on GitHub">https://github.com/pselle/Intro-to-Node.js-Exercises</a></p>
</section>
</div>
<footer>
<div class="copyright">
Intro to Node.js -- GDI Philly 🔔 --
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