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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>I React Workshop</title>
<meta name="apple-mobile-web-app-capable" content="yes"/>
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent"/>
<meta name="viewport"
content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<link rel="stylesheet" href="reveal.js/css/reveal.css">
<!--<link rel="stylesheet" href="reveal.js/css/theme/white.css" id="theme">-->
<!--<link rel="stylesheet" href="reveal.js/css/theme/black.css" id="theme">-->
<!--<link rel="stylesheet" href="reveal.js/css/theme/night.css" id="theme">-->
<link rel="stylesheet" href="reveal.js/css/theme/simple.css" id="theme">
<!-- Code syntax highlighting -->
<link rel="stylesheet" href="reveal.js/lib/css/zenburn.css">
<style>
/*pre code {*/
/*display: block;*/
/*padding: 0.5em;*/
/*background: #FFFFFF !important;*/
/*color: #000000 !important;*/
/*}*/
.right-img {
margin-left: 10px !important;
float: right;
height: 500px;
}
.todo:before {
content: 'TODO: ';
}
.todo {
color: red !important;
}
code span.line-number {
color: lightcoral;
}
.reveal pre code {
max-height: 1000px !important;
}
.hide {
display: none !important;
}
</style>
<!-- Printing and PDF exports -->
<script>
var link = document.createElement('link');
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match(/print-pdf/gi) ? 'reveal.js/css/print/pdf.css' : 'reveal.js/css/print/paper.css';
document.getElementsByTagName('head')[0].appendChild(link);
</script>
<!--[if lt IE 9]>
<script src="reveal.js/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">
<section>
<h3>React Workshop - Preparation</h3>
<ol>
<li>Install node LTS from https://nodejs.org/en/
<li><code>git clone https://github.com/DJCordhose/react-workshop.git</code></li>
<li><code>npm install</code></li>
<li>cd <code>code/workspace</code></li>
<li><code>npm start</code></li>
<li>open <a href="http://localhost:8080" target="_blank">http://localhost:8080</a></li>
</ol>
<p>Slides: <code>2017_en.html</code>
</p>
</section>
<section>
<h1>React Workshop</h1>
<p>
<small><a href="http://nilshartmann.net">Nils Hartmann</a> / <a href="http://twitter.com/nilshartmann">@nilshartmann</a>
</small>
</p>
<p>
<small><a href="http://zeigermann.eu">Oliver Zeigermann</a> / <a href="http://twitter.com/djcordhose">@DJCordhose</a>
</small>
</p>
<p><small><a href="http://djcordhose.github.io/react-workshop/2017_en.html">
http://djcordhose.github.io/react-workshop/2017_en.html</a></small></p>
</section>
<section>
<h2>"Day" I: Introduction Into React and Redux</h2>
<ul>
<li><a href="#/t0">Part 0: Setup and Introduction into React</a>
<li><a href="#/t1">Part I: React and ES6 Basics</a>
<li><a href="#/t2">Part II: Composing Components</a>
<li><a href="#/t3">Part III: Remote-Calls and Promises</a>
<li><a href="#/t4">Part IV: Introduction to Redux</a>
<li><a href="#/t5">Part V: React Router</a>
</ul>
</section>
<section id="t0">
<h1>Part 0</h1>
<h2>Setup and Introduction into React</h2>
</section>
<section>
<h3>React: Applications from Components</h3>
<ul>
<li class="fragment">Everything is a component, even an Application
<li class="fragment">Components wrap Template and Logic
<li class="fragment">Can be implemented as a class or a function
<li class="fragment">JSX (HTML like) as template language
</ul>
<pre class="fragment"><code data-trim contenteditable>class HelloMessage extends React.Component {
render() {
return <h1 className='title'>Hello, World!</h1>
}
}
</code></pre>
</section>
<section>
<h3>Hello World React</h3>
<a target="_blank" href="code/hello_world/public/index.html">Demo</a>
</section>
<section>
<h3>Hello World React</h3>
<pre><code data-trim contenteditable>class HelloMessage extends React.Component {
render() {
return (<div>
<input ref={input => this.input = input}
onChange={event => this.updateModel(event)}
value={this.state.greeting} />
<p>{this.state.greeting}, World</p>
<button
onClick={() => this.reset()}>
Clear
</button>
</div>);
}</code></pre>
<pre class="fragment"><code contenteditable class="javascript"> constructor(props) {
super(props);
this.state = {greeting: this.props.greeting};
}
updateModel(event) {
this.setState({greeting: event.target.value});
}
reset() {
this.setState({greeting: ""});
this.input.focus();
}
}</code></pre>
</section>
<section>
<h3>ES6: Classes</h3>
<pre class="fragment"><code class="javascript" contenteditable>class Person {
constructor(name) {
this._name = name;
}
get name() {
return this._name;
}
}
class Programmer extends Person {
constructor(name, language) {
super(name);
this.language = language;
}
code() {
return this.name + " codes in " + this.language;
}
}</code></pre>
<pre><code class="javascript" contenteditable>const programmer = new Programmer('Erna', 'JavaScript');
console.log(programmer.code());
console.log(programmer instanceof Programmer); // true
console.log(programmer instanceof Person); // true</code></pre>
</section>
<section>
<h3>ES6: Arrow Functions</h3>
<pre><code class="javascript" contenteditable>const displayInPage = (text) => {
return document.body.innerHTML +=
`${text}<br>`;
};</code></pre>
<pre class="fragment"><code class="javascript" contenteditable>const displayInPage = text => document.body.innerHTML += `${text}<br>`;
</code></pre>
</section>
<section>
<h3>Glue code to start application</h3>
<pre><code data-trim contenteditable>
// index.html
<html>
<body>
<div id="mount"></div>
</body>
<script src="dist/main.js"></script>
</html>
</code></pre>
<pre class="fragment"><code data-trim contenteditable class="javascript">
// main.js
import HelloMessage from './HelloMessage';
const mountNode = document.getElementById('mount');
ReactDOM.render(<HelloMessage greeting="Hello"/>, mountNode);
</code></pre>
<a target="_blank" href="code/hello_world/public/index.html">Run</a>
</section>
<section>
<h2>Build Process</h2>
<ul>
<li>ES6- und JSX-Code must be converted toECMAScript 5
<li>Tools
<ul><li>Babel (Compiler)
<li>Webpack (Bundler)
<li>Webpack Dev Sever (HTTP Server with Hot Reload)
</ul>
</ul>
</section>
<section>
<h2>Webpack and Babel</h2>
<img src="images/webpack-und-babel.png" style="border:0;box-shadow:0 0 0 0"/>
</section>
</section>
<section>
<section>
<h2>Excercise: React Hello-World</h2>
<h3>Getting used to tools and write your first React Application</h3>
</section>
<section>
<h3>Step #1: Start Tool-Chain</h3>
<p>Make sure you performed steps as described in initial setup</p>
<p>If your browser displays 'Hello, World' all is fine
</section>
<section>
<h3>Step #2: Your first React application</h3>
<ul>
<li>Replace the static component (HelloMessage) with the component you have seen in the previous slides
<li>Make experiments
<ul>
<li>Make all input upper case
<li>Display feedback when input has been cleared successfully
</ul>
</li>
</ul>
</section>
</section>
<section id="t1">
<h1>Part I</h1>
<h2>React and ES6 Basics</h2>
<a href="code/schritte/1-detail/public/index.html" target="_blank">Complete Application</a>
</section>
<section>
<h3>Topics</h3>
<ul>
<li>Rendering
<li>Properties and State
<li>Refs
</ul>
</section>
<section>
<h2>ES6-Reference</h2>
<p><a href="http://exploringjs.com/es6/" target="_blank">
http://exploringjs.com/es6/
</a>
</section>
<section>
<h3>React: Rendering</h3>
<ul class="fragment">
<li>Every React Component needs a <code>render</code>-Method (or needs to be a function):</li>
<li>will be called when first displayed into DOM and when state changes</li>
<li>uses HTML like JSX syntax</li>
<li>JSX can contain pure JavaScript in curly braces (<code>{}</code>)
</ul>
<pre class="fragment"><code class="xml" contenteditable data-trim>
class GreetingDetail extends React.Component {
render() {
return (
<div>
<input ref={input => this.input = input}
onChange={event => this.updateModel(event.target.value)}
value={this.state.greeting} />
<p>{this.state.greeting}, World</p>
</div>
);
}
// ...
}
</code></pre>
</section>
<section>
<h3>React: Rendering #2</h3>
<ul class="fragment">
<li>DOM-Events are wrapped in React-Events
<li>React-Events have very simliar API as DOM-Events
<li>No automatic 2-way binding to models
</ul>
<pre class="fragment"><code class="xml" contenteditable data-trim>
class GreetingDetail extends React.Component {
render() {
return (
<div>
<input ref={input => this.input = input}
onChange={event => this.updateModel(event.target.value)}
value={this.state.greeting} />
<p>{this.state.greeting}, World</p>
</div>
);
}
updateModel(greeting) {
this.setState({greeting});
}
// ...
}
</code></pre>
</section>
<section>
<h3>ES6: Extended Object Literals</h3>
<pre><code class="javascript" contenteditable>const name = 'Oma';
const person = {
// ES5: name: name
name
};
console.log(person.name); // Oma
</code></pre>
</section>
<section>
<h2>ES6: Modules, Imports und Exports</h2>
</section>
<section>
<h3>ES6: Export of a single class</h3>
<pre><code class="javascript" contenteditable>// Person.js
class Person {
// ...
}
export default Person;
</code></pre>
</section>
<section>
<h3>ES6: Import</h3>
<pre><code class="javascript" contenteditable>// Programmer.js
import Person from './Person';
export default class Programmer extends Person {
// ...
}
</code></pre>
</section>
<section>
<h3>ES6: Named Export and Import</h3>
<pre><code class="javascript" contenteditable data-trim>// util.js
export function displayInPage(text) {
document.body.innerHTML +=
`${text}<br>` ;
}
// or
export { displayInPage };
</code></pre>
<pre class="fragment"><code class="javascript" contenteditable data-trim>import {displayInPage} from "./util";
displayInPage('Hello, World');
</code></pre>
<!--<pre class="fragment"><code class="javascript" contenteditable data-trim>import {displayInPage as display} from "./util";-->
<!--display('Hello, World');-->
<!--</code></pre>-->
<!--<pre class="fragment"><code class="javascript" contenteditable data-trim>import * as util from "./util";-->
<!--util.displayInPage('Hello, World');-->
<!--</code></pre>-->
</section>
<!--<section>-->
<!--<h2>Neuerungen und Verbesserungen in ES6</h2>-->
<!--</section>-->
<!--<section>-->
<!--<h3>Tagged Template Literals</h3>-->
<!--<p><a target="_blank" href="http://exploringjs.com/es6/ch_template-literals.html#_tagged-templates">-->
<!--Mini-DSLs: Template-Literals mit tag-->
<!--</a>-->
<!--</p>-->
<!--<pre class="fragment"><code class="javascript" contenteditable>function tag(strings, ...values) {-->
<!--console.log(strings);-->
<!--//[ '', ' codes in ', '.' ]-->
<!--console.log(values);-->
<!--//[ 'Oma', 'Haskell' ]-->
<!--return 'whatever you want';-->
<!--}-->
<!--</code></pre>-->
<!--<pre><code class="javascript" contenteditable>const expanded = tag`${person} codes in ${language}.`;-->
<!--console.log(expanded);-->
<!--//whatever you want-->
<!--</code></pre>-->
<!--</section>-->
<section>
<h3>ES6: Destructuring of Objects</h3>
<pre><code class="javascript" contenteditable>const person = {
name: 'Olli',
email: '[email protected]'
};</code></pre>
<pre class="fragment"><code class="javascript" contenteditable>const {name, notThere} = person;
console.log(`name=${name}`);
// name=Olli
console.log(`notThere=${notThere}`);
// notThere=undefined
</code></pre>
<!--<pre class="fragment"><code class="javascript" contenteditable>const {address: {city}} = person;-->
<!--console.log(`city=${city}`);-->
<!--//city=Hamburg-->
<!--</code></pre>-->
</section>
<section>
<h3>ES6: Template Literals</h3>
<p><a target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/template_strings">
String-Literals with Gaps
</a>
</p>
<pre><code class="javascript" contenteditable>const person = 'Oma';
const language = 'Haskell';
console.log(`${person} programs
${10 * 1024 * 1024} lines of code
in ${language}.`);
// Output:
// Oma programs
// 10485760 lines of code
// in Haskell.
</code></pre>
</section>
<!--<section>-->
<!--<h3>Destructuring bei Parametern</h3>-->
<!--<pre><code class="javascript" contenteditable>const person = {-->
<!--name: 'Olli',-->
<!--address: {-->
<!--city: 'Hamburg'-->
<!--},-->
<!--email: '[email protected]'-->
<!--};</code></pre>-->
<!--<pre class="fragment"><code class="javascript" contenteditable data-trim>-->
<!--function print({email: contact}) {-->
<!--console.log(`contact=${contact}`);-->
<!--}-->
<!--print(person);-->
<!--// [email protected]>
<!--</code></pre>-->
<!--<pre class="fragment"><code class="javascript" contenteditable data-trim>-->
<!--function g({name: x, y, z=10}) {-->
<!--console.log(`x=${x}`); // x=olli-->
<!--console.log(`y=${y}`); // y=undefined-->
<!--console.log(`z=${z}`); // z=10-->
<!--}-->
<!--g({ name: 'olli' });-->
<!--</code></pre>-->
<!--</section>-->
<!--<section>-->
<!--<h3>Destructuring bei Arrays</h3>-->
<!--<pre><code class="javascript" contenteditable>const [a, b] = [1, 2];-->
<!--console.log(`a=${a}`);-->
<!--// a=1-->
<!--console.log(`b=${b}`);-->
<!--// b=2-->
<!--</code></pre>-->
<!--<pre class="fragment"><code class="javascript" contenteditable data-trim>-->
<!--const [, b] = [1, 2];-->
<!--console.log(`b=${b}`);-->
<!--//b=2-->
<!--</code></pre>-->
<!--</section>-->
<!--<section>-->
<!--<h3>Erweiterte Objekt-Literale</h3>-->
<!--<pre><code class="javascript" contenteditable>const name = 'Oma';-->
<!--const person = {-->
<!--// ES5: name: name-->
<!--name,-->
<!--// ES5: toString: function()-->
<!--toString() {-->
<!--return this.name;-->
<!--}-->
<!--};-->
<!--console.log(person.name); // Oma-->
<!--console.log(person.toString()); // Oma-->
<!--</code></pre>-->
<!--</section>-->
<!--<section>-->
<!--<h3>for..of</h3>-->
<!--<p><a target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of">-->
<!--Iterieren über alles was 'iterable' ist-->
<!--</a>-->
<!--</p>-->
<!--<pre><code class="javascript" contenteditable>for (const e of array2) {-->
<!--console.log(e);-->
<!--}-->
<!--// Hi-->
<!--// Olli-->
<!--// how are you-->
<!--// ?-->
<!--</code></pre>-->
<!--</section>-->
<!--<section>-->
<!--<h3>Spread-Operator</h3>-->
<!--<p><a target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator">-->
<!--Alles was 'iterable' ist kann in einzelne Parameter transformiert werden-->
<!--</a>-->
<!--</p>-->
<!--<pre><code class="javascript" contenteditable>const array1 = ['Olli', 'how are you'];-->
<!--const array2 = ['Hi', ...array1, '?'];-->
<!--console.log(array2);-->
<!--// => ["Hi", "Olli", "how are you", "?"]-->
<!--</code></pre>-->
<!--<pre class="fragment"><code class="javascript" contenteditable>console.log(...array1);-->
<!--</code></pre>-->
<!--</section>-->
<!--<section>-->
<!--<h2>Verbesserungen bei Funktionen in ES6</h2>-->
<!--</section>-->
<section>
<h3>React: Properties and State</h3>
<ul class="fragment">
<li><b>Properties</b> are being passed to components from <b>outside</b> and are immutable</li>
<li><b>State</b> an <b>internal</b> property of a component and can be changed</li>
<li>Both are objects containing key-/value pairs</li>
<li>Both can be passed to child components</li>
</ul>
</section>
<section>
<h3>Properties of a Component</h3>
<ul class="fragment">
<li>Properties initially being passed in contructor</li>
<li>RO Access using <code>this.props</code></li>
</ul>
<pre class="fragment"><code class="javascript" contenteditable data-trim>
class TitleComponent extends React.Component {
constructor(props) {
super(props);
}
render() {
return <h1>{this.props.title}</h1>
}
// ...
}
</code></pre>
<pre class="fragment"><code class="javascript" contenteditable data-trim>
<TitleComponent title='Hello World' />
</code></pre>
</section>
<section>
<h3>State of a Component</h3>
<ul class="fragment">
<li>Example: Data from Input Field or loaded from Server</li>
<li>Initialization in Constructor <code>this.state={}</code>
<li><b>Read</b> state using <code>this.state</code>
<li><b>Set</b> state using <code>this.setState()</code>
<ul><li>not really a setter</li>
<li>merges old and new state</li>
<li><b>triggers re-rendering of <i>complete</i> component</b></li>
</ul>
</ul>
</section>
<section>
<h3>Example: State of a component</h3>
<pre><code class="javascript" contenteditable data-trim>
class GreetingDetail extends React.Component {
constructor(props) {
super(props);
this.state = { name: 'Klaus' };
}
updateModel(event) {
this.setState({name: event.target.value});
}
render() {
return <input value={this.state.name}
onChange={e => this.updateModel(e)} />
}
// ...
}
</code></pre>
</section>
<section>
<h3>React: Refs</h3>
<ul class="fragment">
<li>When rendering you can get access to the underlying DOM element
<li>you get this reference passed into a function
<li>typically you store the reference into a class variable
</ul>
<pre class="fragment"><code class="javascript" contenteditable data-trim>
class HelloMessage extends React.Component {
render() {
return (
<div>
<input ref={input => this.input = input} />
<button
onClick={() => this.input.focus()}>
Focus
</button>
</div>);
}
}
</code></pre>
</section>
<section>
<h2>Exercise: Detail View for Greeting Application</h2>
<h3>Create a component that lets you enter a name and a greeting</h3>
</section>
<section>
<h3>Steps</h3>
<h4>Extend you first React Component in the workspace Folder</h4>
<ul>
<li>rename your component to <code>GreetingDetail</code>
<li>you need to input field that set <code>name</code> und <code>greeting</code> in the component's state
<li>for basic styling copy material from <code>code/material/1-detail</code> to your <code>public</code> folder
<li><em>Optional Step: Extend your component so that you can pass in initial State as Properties from the outside</em>
</ul>
</section>
<section id="t2">
<h1>Part II</h1>
<h2>Composing Components</h2>
<h3>Building a Complete Application from Components</h3>
<a href="code/schritte/2-hierarchy/public/index.html" target="_blank">Complete Application</a>
</section>
<section>
<h2>Reference</h2>
<p><a href="https://facebook.github.io/react/docs" target="_blank">
https://facebook.github.io/react/docs
</a>
</p>
</section>
<section>
<h3>Topics</h3>
<ul>
<li>Components as Functions
<li>Displaying Lists and Keys
<li>Architectural Vision: Smart and Dumb Components
<li>Passing State and Callbacks
<li>PropTypes
</ul>
</section>
<section>
<h3>Components as Functions</h3>
<ul class="fragment">
<li>function more or less <code>render</code> method</li>
<li>Properties are being passed as parameters</li>
<li>Currently no state and no lifecycle methods</li>
</ul>
<pre class="fragment"><code class="xml" contenteditable data-trim>
function Layout(props) {
return (
<div className="Main">
<div className="Container">
{props.children}
</div>
</div>
);
}
</code></pre>
</section>
<section>
<h3>Lists and Keys</h3>
<ul class="fragment">
<li>No special synatx in JSX for Listen
<li>Instead use JavaScripts's <code>Array.map</code>
<li>Elements of a List need unique key
</ul>
<pre class="fragment"><code class="javascript" contenteditable data-trim>
const greetings = [{
id: 0,
name: 'Olli',
greeting: 'Huhu'
},
{
id: 1,
name: 'Oma',
greeting: 'Hallo'
}
];
const body = greetings.map(greeting =>
<tr key={greeting.id}>
<td>{greeting.name}</td>
<td>{greeting.greeting}</td>
</tr>);
</code></pre>
</section>
<section>
<h2>Smart and Dumb Components</h2>
<p>Common Architectural Pattern</p>
<p>Not restricted to React</p>
</section>
<section>
<h3>Smart Components (aka Container Components aka Containers)</h3>
<ul>
<li>manage a selection of the current application state (or are connected to state management)
<li>pass down state to their children as properties
<li>have UI logic they can call or pass down to their children as properties
<li>might be mapped to a specific URL
</ul>
</section>
<section>
<h3>Dumb Components (aka Presentational Components aka Components)</h3>
<ul>
<li>do not manage state (and are not connected to state management)
<li>typically only contain other Dumb Components (there are
<a target="_blank" href="https://medium.com/@dan_abramov/smart-and-dumb-components-7ca2f9a7c7d0#.z8xy5zvhs">
exceptions to this rule</a>)
<li>have no knowledge of their parent
<li>can hold and manage temporary UI (like expanded or open)
</ul>
</section>
<section>
<h3>Communication</h3>
<img src="images/smart-dumb-w-label.png">
</section>
<section>
<h3>Passing of State and Callbacks</h3>
<p class="fragment">
Both are passed via props
</p>
<pre class="fragment"><code class="javascript" contenteditable data-trim>
class GreetingController extends React.Component {
render() {
const {greetings} = this.state;
return (
<div>
<GreetingMaster greetings={greetings}
onAdd={() => this.setState({mode: MODE_DETAIL})}
</div>);
}
// ...
}
</code></pre>
</section>
<section>
<h3>Passing Properties using Object-Spread</h3>
<ul class="fragment">
<li>Passes <b>all</b> fields of an Object as individual Properties</li>
</ul>
<pre class="fragment"><code class="javascript" contenteditable data-trim>
class GreetingController extends React.Component {
const greeting = { name: 'Klaus', greeting: 'Hello' };
render() {
return <GreetingDetail {...greeting} />
// same as:
// <GreetingDetail name='Klaus' greeting='Hello' />
}
}
</code></pre>
</section>
<section>
<h3>PropTypes</h3>
<ul class="fragment">
<li>You can declare what properties a component expects
<li>Can contain type information
<li>Wrong or missing properties result in warnings at run time
<li><a href="https://facebook.github.io/react/docs/typechecking-with-proptypes.html" target="_blank">
Reference
</a>
</ul>
<pre class="fragment"><code class="javascript" contenteditable data-trim>
GreetingDetail.propTypes = {
greeting: PropTypes.shape({
name: React.PropTypes.string.isRequired,
greeting: React.PropTypes.string.isRequired
}),
onAdd: PropTypes.func.isRequired
};
</code></pre>
</section>
<section>
<h2>Exercise: Compose a complete Application</h2>
<h3>Assemble your existing Detail View and a Master View (Dumb Components) with the GreetingController (Smart Component)</h3>
</section>
<section>
<h3>Steps</h3>
<ul>
<li>copy material from <code>code/material/2-hierarchy</code> into your src folder
<li>in <code>GreetingController</code> extend the render method to display the Detail View when a user clicks the Add Button
<li>in the <code>GreetingController</code> you will already find a guiding comment that also indicates where you need to include the component
<li>to the Detail View pass a callback that uses the <code>addGreeting</code> method that has already been prepared for you
<li>in <code>GreetingDetail</code> you need a new button that triggers the callback with the newly created greeting as a parameter
</ul>
</section>
<section>
<h3>Architecture Sample Application</h3>
<img src="ai/greeting-hierarchy.png" style="border:0;box-shadow:0 0 0 0"/>
</section>
<section>
<h3>GreetingMaster</h3>
<img src="images/greeting-master.png" style="border:0;box-shadow:0 0 0 0"/>
</section>
<section>
<h3>GreetingDetail</h3>
<img src="images/greeting-detail.png" style="border:0;box-shadow:0 0 0 0"/>
</section>
<section id="t3">
<h1>Part III</h1>
<h2>Remote-Calls to Server</h2>
<a href="code/schritte/3-remote/public/index.html" target="_blank">Complete Application</a>
</section>
<section>
<h3>Challenges</h3>
<ul>
<li>How to load and save technically?
<li>How to do async operations in React?
<li>Where to trigger initial load?
</ul>
</section>
<section>
<h2>fetch</h2>
<p>Browser API to load and save data</p>
</section>
<section>
<h3>fetch as a simple GET</h3>
<pre><code class="javascript" contenteditable>const url = `${BACKEND_URL}${path}`;
fetch(url)
.then(response => response.json())
.then(json => /* ... */)
.catch(ex => console.error('request failed', ex));
</code></pre>
</section>
<section>
<h3>fetch sending JSON using POST</h3>
<pre><code class="javascript" contenteditable>const url = `${BACKEND_URL}${path}`;
const objectBeSaved = ...;
fetch(url, {
method: 'POST',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify(objectBeSaved)
})
.then(json => response.status === 201 ? /* success */ :
/* failure */)
.catch(ex => console.error('request failed', ex));
</code></pre>
</section>
<section>
<h2>Promises</h2>
</section>
<section>
<h3>A Promise will resolve to a value, be rejected or abort with an error</h3>
<ul>
<li class="fragment">If it resolves this might be right now or in the future</li>
<li class="fragment">In any case a reaction will be asynchronous</li>
</ul>
</section>
<section>
<h3>Create a Promoise and react asynchronously</h3>
<pre class="fragment"><code class="javascript" contenteditable>const promise = new Promise(resolve =>
setTimeout(
() => resolve('Result from promise'),
1000)
);
</code></pre>
<pre><code class="javascript" contenteditable>promise.then(value => console.log(value));
// Output after 1 second: Result from promise
</code></pre>
</section>
<section>
<h3>Chaining Execution</h3>
<pre><code class="javascript" contenteditable>const promise = new Promise(resolve =>
setTimeout(
() => resolve('Result from promise'),
1000)
);
</code></pre>
<pre class="fragment"><code class="javascript" contenteditable>// then returns a new promise
const promise2 = promise.then(value => `${value} plus stuff`);</code></pre>
<pre class="fragment"><code class="javascript" contenteditable>promise2.then(value => console.log(value));
// Output after 1 second: Result from promise plus stuff
</code></pre>
</section>
<section>
<h3>Errors abort the rest of the chain</h3>
<p class="fragment">Unfortunately, such an error will be swallowed if you do not react to it</p>
</section>
<section>
<h3>Catch Clause</h3>
<pre><code class="javascript" contenteditable>Promise
// creates and directly resolves promise
.resolve('Result from promise')
.then(x => {
// this will be printed
console.log(x);
})
.then(() => {
console.log('This will be printed');
})
// this will NOT be printed as no error occured
.catch(e => console.log('error: ', e))
// Output:
// Result from promise
// This will be printed</code></pre>
</section>
<section>
<h3>Catch Clause when there is an error</h3>
<pre><code class="javascript" contenteditable>Promise
// creates and directly resolves promise
.resolve('Result from promise')
.then(x => {
// this will be printed
console.log(x);
throw new Error('Something went wrong');
})
.then(() => {
console.log('This will NOT be printed');
})
// this will be printed
.catch(e => console.log('error: ', e))
// Output:
// Result from promise
// error: [Error: Something went wrong]</code></pre>
</section>
<section>
<h3>Catch Clause when Promise is rejected</h3>
<pre><code class="javascript" contenteditable>Promise
// creates and directly rejects promise
.reject('Promise rejected')
.then(x => {
// this will NOT be printed
console.log(x);
})
.then(() => {
console.log('This will NOT be printed');
})
// this will be printed
.catch(e => console.log('error: ', e))
// Output:
// error: Promise rejected</code></pre>
</section>
<section>