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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>React Router Lecture</title>
<link rel="stylesheet" href="css/reveal.css">
<!-- <link rel="stylesheet" href="css/theme/black.css"> -->
<link rel="stylesheet" href="css/theme/league.css" id="theme">
<!-- <link rel="stylesheet" href="css/theme/white.css" id="theme"> -->
<!-- Theme used for syntax highlighting of code -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!-- prefetch -->
<link rel="prefetch" href="assets/mynameis.webm">
<link rel="prefetch" href="assets/LeagueGothicCyrillic.ttf">
<!-- favicon -->
<link rel="icon" type="image/png" href="assets/favicon-32x32.png" sizes="32x32">
<link rel="icon" type="image/png" href="assets/favicon-16x16.png" sizes="16x16">
<!-- 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 ) ? 'css/print/pdf.css' : 'css/print/paper.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
</script>
<style>
a.small { font-size: 0.7em !important }
p.small { font-size: 1em !important }
.left { width: 100%; text-align: left; }
.right { width: 100%; text-align: right; }
.router-red { color: rgb(202, 68, 66); }
h1 span.router-red {
text-shadow: rgb(250, 82, 74) 0px 1px 0px,
rgb(250, 82, 74) 0px 2px 0px,
rgb(250, 82, 74) 0px 3px 0px,
rgb(250, 82, 74) 0px 4px 0px;
}
h1 span.router-red sup { font-size: 0.85em; vertical-align: top; }
.reveal pre { font-size: 1.0em; width: 100%; }
.reveal section p { font-size: 1.2em; }
.reveal section ul { font-size: 1.2em; }
.reveal section ul.small { font-size: 1.0em; }
.reveal section pre code { font-size: 0.75em; line-height: 1.2 }
.reveal section pre code.small { font-size: 0.65em; line-height: 1.2 }
.reveal pre code mark { background-color: rgb(202, 68, 66); color: #fff }
.reveal section ul li sup { font-size: 0.4em; }
.reveal ::selection { background-color: rgb(202, 68, 66); }
.reveal a { color: rgb(202, 68, 66) }
.reveal a.invert { color: rgb(255, 255, 255) }
.reveal a:hover, .reveal a.invert:hover { color: rgb(250, 82, 74) }
.reveal section p.link-over-code { position: absolute; bottom: 0; margin: 0; padding: 0; line-height: 1.2em; fill: rgb(202, 68, 66); }
.reveal section p.link-over-code > a { margin: 0 10px 0 0; }
.reveal section p.link-over-code > a::before { content: url(./assets/router.svg); margin-right: 15px; }
.reveal section p.link-over-code_level2 { margin-bottom: 1.3em }
.reveal section p.link-over-code_level3 { margin-bottom: 2.6em }
.reveal section a.inline::before { content: url(./assets/router.svg); margin-right: 15px; }
.reveal section .fragment.no-init-space { display: none }
.reveal section .fragment.no-init-space.visible { display: inline-block }
@font-face { font-family: LeagueGothicCyrillic; src: url(./assets/LeagueGothicCyrillic.ttf) }
.cyrillic { font-family: LeagueGothicCyrillic !important }
.error { color: rgb(250, 82, 74) }
.comment { color: rgb(127, 159, 127)}
</style>
</head>
<body>
<div class="reveal">
<div class="slides">
<section><p>history.push(<span class="router-red">'/start'</span>);</p></section>
<section
data-background-image="assets/quest.webp"
data-background-size="contain"
data-background-repeat="norepeat"></section>
<section
data-background-video="assets/mynameis.webm"
data-background-size="contain"
data-autoplay></section>
<section
data-background-image="assets/router_guys.webp"
data-background-size="contain"
data-background-repeat="norepeat"></section>
<section data-background-image="assets/bg_routes.webp">
<h1 class="left"><span class="router-red">React Router</span></h1>
<br><br><br><br>
<h2 class="right">performed by</h2>
<h2 class="right">Oleksiy <span class="router-red cyrillic">Лёша</span> Dubovyk</h2>
</section>
<section>
<h1>Concept of a Router</h1>
<p class="fragment">What is a Router?</p>
<p class="fragment">Why do we need it?</p>
</section>
<section>
<h1>Concept of a Router</h1>
<p>In Web Development</p>
<p><span class="router-red">Routing</span> is a process of matching of a <span class="router-red">URL</span> to a <span class="router-red">View</span></p>
</section>
<section>
<h1>Concept of a Router</h1>
<p>In Single Page Applications (SPAs)
<p class="left"><span class="router-red">View</span> is a set of components being rendered</p>
<p class="left"><span class="router-red">Router</span> dynamically loads components and changes what's displayed in the Browser as user navigates the page.</p>
<p class="left fragment"><span class="router-red">P. S.</span> Without reloading the page</p>
<p class="left fragment"><span class="router-red">P. P. S.</span> Because it's SPA</p>
</section>
<section
data-background-image="assets/router_basics_1.webp"
data-background-size="contain"
data-background-repeat="norepeat"
data-background-color="white"></section>
<section
data-background-image="assets/router_basics_2.webp"
data-background-size="contain"
data-background-repeat="norepeat"
data-background-color="white"></section>
<section
data-background-image="assets/router_basics_3.webp"
data-background-size="contain"
data-background-repeat="norepeat"
data-background-color="white"></section>
<section
data-background-image="assets/router_basics_4.webp"
data-background-size="contain"
data-background-repeat="norepeat"
data-background-color="white"></section>
<section
data-background-image="assets/router_basics_5.webp"
data-background-size="contain"
data-background-repeat="norepeat"
data-background-color="white"></section>
<section
data-background-image="assets/router_basics_6.webp"
data-background-size="contain"
data-background-repeat="norepeat"
data-background-color="white"></section>
<section
data-background-image="assets/router_basics_7.webp"
data-background-size="contain"
data-background-repeat="norepeat"
data-background-color="white"></section>
<section>
<h2>Using Router allows to</h2>
<ul>
<li>Keep UI in sync with the URL</li>
<li>Bookmark individual SPA pages</li>
<li>Use Browser history, Back/Forward buttons</li>
</ul>
</section>
<section>
<h1>React Router</h1>
<p><span class="router-red">React</span> isn't a framework, it's a library.</p>
<p>Therefore, it doesn't solve all the application's needs.</p>
<p class="fragment">It does a great job at creating components and managing state,<br>
but creating a more complex SPA requires additional libraries.</p>
</section>
<section>
<h1>React Router</h1>
<p><span class="router-red">React Router</span> is an external library that manages navigation<br>
and rendering of components in the React applications</p>
</section>
<section>
<h1>React Router <span class="router-red">v4<sup>+</sup></span></h1>
<p>First thing to check when looking for a documentation,<br>
an article or a solution at StackOverflow,<br>
it that it is about React Router <span class="router-red">v4+</span>.</p>
</section>
<section style="width: 100%;">
<h1>React Router <span class="router-red">v4<sup>+</sup></span></h1>
<ul>
<li>Way different in its Philosophy and mental model</li>
<li>Dynamic Routing, no static centralized routing configuration</li>
<li>Natural Nesting Routes, Code Splitting</li>
<li>First class React Native support</li>
<li>Virtually the entire API is <span class="router-red">Just Components <sup>TM</sup></span></li>
</ul>
<p class="right fragment"><a class="small" href="https://reacttraining.com/react-router/core/guides/philosophy">https://reacttraining.com/react-router/core/guides/philosophy</a></p>
</section>
<section style="width: 100%;">
<h1>React Router <span class="router-red">v5</span></h1>
<ul>
<li>Fully backwards compatible with v4</li>
<li>Orignally meant to be released as v4.4</li>
<li>Reason for a major version bump is a single character: ^</li>
<li>Structural improvements like better support for React 16</li>
<li>Some new features like using an array in <Route path></li>
</ul>
<p class="right"><a class="small" href="https://reacttraining.com/blog/react-router-v5/">https://reacttraining.com/blog/react-router-v5/</a></p>
</section>
<section>
<img src="assets/react_training_site.webp">
<p class="right"><a class="small" href="https://reacttraining.com/react-router/">https://reacttraining.com/react-router/</a></p>
</section>
<section>
<h1>React Router Packages</h1>
<ul class="small">
<li>Web <span class="fragment">– <span class="router-red">react-router-dom</span> package, used for Web Browser</span></li>
<li>Native <span class="fragment">– <span class="router-red">react-router-native</span> package, used for React Native</span></li>
<li>Core <span class="fragment">– <span class="router-red">react-router</span> package, dependency, never used directly</span></li>
</ul>
</section>
<section>
<p>React Router is not included in React by default,</p>
<p>so you need to install it on top of React itself:</p>
<pre><code class="no-highlight" data-trim data-noescape>npm install --save react
npm install --save react-dom
<mark>npm install --save react-router-dom</mark></code></pre>
</section>
<section>
<p>It's not even included in Create React App by default:</p>
<pre><code class="no-highlight" data-trim data-noescape>npx create-react-app my-app
cd my-app
<mark>npm install --save react-router-dom</mark></code></pre>
</section>
<section>
<h1>Basic Components</h1>
<p>There are three types of components in React Router:</p>
<ul>
<li class="fragment"><span class="router-red">Router</span> components</li>
<li class="fragment"><span class="router-red">Route matching</span> components</li>
<li class="fragment"><span class="router-red">Navigation</span> components</li>
</ul>
</section>
<section>
<h2>Router components</h2>
</section>
<section>
<h3 class="left">Browser related Router types:</h3>
<ul class="left small">
<li>BrowserRouter <span class="fragment">– for modern browsers that support HTML5 History API</span></li>
<li>HashRouter <span class="fragment">– for legacy browsers (uses window.location.hash)</span></li>
</ul>
<br><br>
<div class="fragment left">
<h3>Router types not related to browsers:</h3>
<ul class="small">
<li>MemoryRouter <span class="fragment">– for Testing or non-DOM envs like React-Native</span></li>
<li>StaticRouter <span class="fragment">– for Server-Side Rendering</span></li>
</ul>
</div>
</section>
<section>
<p class="left" style="padding: 0; margin: 0">BrowserRouter</p>
<p class="left" style="padding: 0; margin: 0"><img style="margin: 0" src="assets/browser-router.png"></p>
<pre style="padding: 0; margin: 0"><code class="js">import { BrowserRouter } from 'react-router-dom';</code></pre>
<p class="left" style="padding: 0; margin: 1em 0 0 0">HashRouter</p>
<p class="left" style="padding: 0; margin: 0"><img src="assets/hash-router.png"></p>
<pre style="padding: 0; margin: 0"><code class="js">import { HashRouter } from 'react-router-dom';</code></pre>
</section>
<section>
<p class="small">BrowserRouter requires a default SPA route to be configured on Server.</p>
<p class="small">Otherwise here's what's happening:</p>
<img src="assets/browser-router-on-static.gif" style="width: 100%">
</section>
<section>
<p class="small">Default SPA route on Express server</p>
<pre><code class="js small">const express = require('express');
const path = require('path');
const app = express();
app.use(express.static(path.join(__dirname, '../dist')));
app.get('*', (req, res) => { // SPA default route
res.sendFile(path.join(__dirname, '../dist/index.html'));
});
app.listen(3000);</code></pre>
</section>
<section>
<p class="small">Default SPA route on Webpack Dev Server</p>
<pre><code class="js small" data-noescape>const path = require('path');
module.exports = {
devServer: {
inline: true,
contentBase: './',
historyApiFallback: { // SPA default route
index: 'index.html'
}
},
};</code></pre>
</section>
<section>
<p>HashRouter is the fallback in case<br>there is no control of Server side or static HTML.</p>
<p class="fragment">Like GitHub Pages for example.</p>
<p class="fragment">Or this presentation.</p>
</section>
<section>
<p>HashRouter on Static Server</p>
<img src="assets/hash-router-on-static.gif" style="width: 100%">
</section>
<section>
<p>Importing a Router component:</p>
<pre><code class="js" data-noescape>import { BrowserRouter } from 'react-router-dom';</code></pre>
<pre><code class="js" data-noescape>import { HashRouter } from 'react-router-dom';</code></pre>
<p>Renaming to Router on import:</p>
<pre><code class="js" data-noescape>import { BrowserRouter as Router } from 'react-router-dom';</code></pre>
<pre><code class="js" data-noescape>import { HashRouter as Router } from 'react-router-dom';</code></pre>
</section>
<section>
<h3>Coming Soon</h3>
We'll take another look at<br>BrowserRouter & HashRouter<br>after we're familiar with other basic components
</section>
<section>
<h2>Route matching components</h2>
<p>There are two route matching components:</p>
<ul>
<li>Route</li>
<li>Switch</li>
</ul>
</section>
<section>
<p>Importing the Route matching components</p>
<pre><code class="js" data-noescape>import { Route } from 'react-router-dom';</code></pre>
<pre><code class="js" data-noescape>import { Route, Switch } from 'react-router-dom';</code></pre>
<pre><code class="js" data-noescape>import { BrowserRouter, Route, Switch } from 'react-router-dom';</code></pre>
</section>
<section>
<h2>Route matching</h2>
<ul>
<li class="fragment">Route matching is done by comparing a<br><Route <span class="router-red">path</span>> prop to the current <span class="router-red">location.pathname</span>.</li>
<li class="fragment">When a <Route> matches it will render its <span class="router-red">content</span><br>and when it does not match, it will render <span class="router-red">null</span>.</li>
<li class="fragment">A <Route> with <span class="router-red">no path</span> will <span class="router-red">always</span> match.</li>
</ul>
</section>
<section style="padding: 0; margin: 0;">
<h2>Route matching</h2>
<pre style="padding: 0; margin: 0;"><code class="js" style="max-height: none;">// when location.pathname = '/about'
<Route path='/about' component={About} /> // renders <About/>
<Route path='/contact' component={Contact} /> // renders null
<Route component={Always} /> // renders <Always/>
// v5.1+ alternative to <Route path="/about" component={About} />
<Route path="/about">
<About />
</Route>
</code></pre>
</section>
<section style="padding: 0; margin: 0;"><pre style="padding: 0; margin: 0;"><code class="js" style="max-height: none;">import React from 'react';
import { render } from 'react-dom';
import { BrowserRouter, Route } from 'react-router-dom';
const Hello = () => (<h1>Hello, World!</h1>);
const App = () => (
<BrowserRouter>
<Route path="/" component={Hello} />
</BrowserRouter>
);
render(<App />, document.getElementById('root'));</code></pre>
<p class="right link-over-code"><a class="fragment small" href="http://127.0.0.1:8000/" target="_blank">Example #0</a></p>
</section>
<section style="padding: 0; margin: 0;"><p class="left small">A <Router> may have only one child element in <span class="router-red">v4</span></p><pre style="padding: 0; margin: 0;"><code class="js" style="max-height: none;">...
const App = () => (
<BrowserRouter>
<Route path="/" component={Home} />
<Route path="/about" component={About} />
</BrowserRouter>
);
...</code></pre>
<pre style="padding: 0; margin: 0;"><code class="no-highlight error" style="max-height: none;">Uncaught Error: A <Router> may have only one child element
at invariant (browser.js:38)
at Router.componentWillMount (Router.js:73)
at callComponentWillMount (react-dom.development.js:6370)</code></pre>
</section>
<section style="padding: 0; margin: 0;"><p class="left small">Multiple <Router> children must be wrapped in <span class="router-red">v4</span> <span class="fragment" data-fragment-index="0">(they're OK in <span class="router-red">v5</span>)</span></p>
<div style="position: relative">
<div class="fragment fade-out" style="position:absolute; margin-left: auto; margin-right: auto; left: 0; right: 0;" data-fragment-index="0">
<pre style="padding: 0; margin: 0;"><code class="js" style="max-height: none;">...
const App = () => (
<BrowserRouter>
<div>
<Route path="/" component={Home} />
<Route path="/about" component={About} />
</div>
</BrowserRouter>
);
...</code></pre>
</div>
<div class="fragment fade-in" style="position:absolute; margin-left: auto; margin-right: auto; left: 0; right: 0;" data-fragment-index="0">
<pre style="padding: 0; margin: 0;"><code class="js" style="max-height: none;">...
const App = () => (
<BrowserRouter>
<Route path="/" component={Home} />
<Route path="/about" component={About} />
</BrowserRouter>
);
...</code></pre><p class="right link-over-code"><a class="small" href="http://127.0.0.1:8001/" target="_blank">Example #1</a></p>
</div>
</div>
</section>
<section>
<h3>Inclusive Routing (v4+ default)</h3>
<div style="position: relative">
<pre style="padding: 0; margin: 0;"><code class="js" data-noescape style="max-height: none;">...
const App = () => (
<BrowserRouter>
<Route <span class="fragment no-init-space router-red" data-fragment-index="0">exact </span>path="/" component={Home} />
<Route path="/about" component={About} />
</BrowserRouter>
);
...</code></pre>
<p class="fragment right link-over-code" data-fragment-index="0"><a class="small" href="http://127.0.0.1:8002/" target="_blank">Example #2</a></p>
</div>
</section>
<section>
<h3>Inclusive Routing use case</h3>
<div style="position: relative">
<pre style="padding: 0; margin: 0;"><code class="js" data-noescape style="max-height: none;">const App = () => (
<BrowserRouter>
<header>
<Route path="/user" component={UserMenu} />
</header>
<main>
<Route exact path="/" component={Home} />
<Route path="/user" component={UserContent} />
</main>
</BrowserRouter>
);</code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8003/" target="_blank">Example #3</a></p>
</div>
</section>
<section>
<h3>Exclusive Routing</h3>
<div style="position: relative">
<pre style="padding: 0; margin: 0;"><code class="js" data-noescape style="max-height: none;" contenteditable spellcheck="false">import { BrowserRouter, Route, Switch } from 'react-router-dom';
const App = () => (
<BrowserRouter>
<Switch>
<Route path="/users/add" component={UsersAdd} />
<Route path="/users" component={Users} />
<Route path="/" component={Home} />
</Switch>
</BrowserRouter>
);</code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8004/" target="_blank">Example #4</a></p>
</div>
</section>
<section>
<h3>Route path array (v5)</h3>
<div style="position: relative">
<pre style="padding: 0; margin: 0;"><code class="js" data-noescape style="max-height: none;">// Instead of this
<Switch>
<Route path="/user" component={User} />
<Route path="/profile" component={User} />
</Switch></code></pre>
<pre style="padding: 0; margin: 30px 0 0;"><code class="js" data-noescape style="max-height: none;">// You can use an array in v5
<Route path={['/user', '/profile']} component={User} /></code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8005/user" target="_blank">Example #5</a></p>
</div>
</section>
<section>
<h2>Navigation components</h2>
<ul>
<li>Link</li>
<li>NavLink</li>
<li>Redirect</li>
</ul>
</section>
<section>
<h3>Link</h2>
<p class="left small"><Link> component is used to create links in your application</p>
<pre><code class="js"><Link to='/'>Home</Link></code></pre>
<p class="left small">When a <Link> is rendered, an <a> will be rendered in HTML</p>
<pre><code class="html"><a href="/">Home</a></code></pre>
<p class="left small">Now we are ready to revisit our BrowserRouter & HashRouter friends!</p>
</section>
<section>
<ul>
<li>BrowserRouter on a Static Page <a class="small inline" href="http://127.0.0.1:8006/" target="_blank">Example #6</a></li>
<li>HashRouter on a Static Page <a class="small inline" href="http://127.0.0.1:8007/" target="_blank">Example #7</a></li>
<li>BrowserRouter on a Dynamic Server <a class="small inline" href="http://127.0.0.1:8008/" target="_blank">Example #8</a></li>
</ul>
</section>
<section>
<div style="position: relative">
<p class="left small"><Link> to object</p>
<pre><code class="js"><Link to={{
pathname: '/about', // A string representing the path to link to
search: '?what=company', // A string represenation of query parameters
hash: '#sub-section', // A hash to put in the URL
state: { fromHome: true } // State to persist to the location
}}>
Home
</Link></code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8009/" target="_blank">Example #9</a></p>
</div>
</section>
<section>
<div style="position: relative">
<p class="left small"><Link replace></p>
<p class="left small">When true, clicking the link will replace the current entry in the history stack instead of adding a new one.</p>
<pre><code class="js"><Link to='/about' replace>Home</Link></code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8010/" target="_blank">Example #10</a></p>
</div>
</section>
<section>
<h3>NavLink</h2>
<p class="left small"><NavLink> is a special type of <Link> that can style itself as “active” when its to prop matches the current location</p>
<div style="position: relative">
<pre><code class="no-highlight" data-noescape><span class="comment">// when location.pathname = '/about'</span>
<NavLink to="/about">About</NavLink> <span class="comment">// 'active' class is added by default</span>
<NavLink to="/about" <span class="router-red">activeClassName</span>="special">About</NavLink>
<NavLink to="/about" <span class="router-red">activeStyle</span>={{
fontWeight: bold,
color: orange
}}>About</NavLink></code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8011/" target="_blank">Example #11</a></p>
</div>
</section>
<section>
<p class="left small"><NavLink> analyses its current location, just like <Route> does.<br>Thus the same caveats:</p>
<div style="position: relative">
<pre><code class="no-highlight"><nav>
<NavLink to="/">Home</NavLink>
<NavLink to="/about">About</NavLink>
<NavLink to="/contacts">Contacts</NavLink>
</nav>
<Switch>
<Route exact path="/" component={Home} />
<Route path="/about" component={About} />
<Route path="/contacts" component={Contacts} />
</Switch></code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8012/" target="_blank">Example #12</a></p>
</div>
</section>
<section>
<div style="position: relative">
<p class="small left"><NavLink <span class="router-red">exact</span>> and <NavLink <span class="router-red">strict</span>></p>
<pre><code class="no-highlight" data-noescape><NavLink <span class="router-red">exact</span> to="/">Home</NavLink>
<Route <span class="router-red">exact</span> path="/">Home</NavLink></code></pre>
<pre><code class="no-highlight" data-noescape><NavLink <span class="router-red">strict</span> to="/about/">About</NavLink>
<Route <span class="router-red">strict</span> path="/about/">About</NavLink></code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8013/" target="_blank">Example #13</a></p>
</div>
</section>
<section>
<h3>Redirect</h2>
<p class="left small">When <Redirect> is rendered it navigates to a new location.<br>Current location is replaced in the history stack (replace by default)</p>
<div style="position: relative">
<pre><code class="js" data-noescape><Redirect to="/about" /></code></pre>
<pre><code class="js" data-noescape><Redirect to={{
pathname: '/login',
search: '?utm=your+face',
state: { from: currentLocation }
}}></code></pre>
</div>
</section>
<section>
<p class="small left"><Redirect from> within a Switch</p>
<pre><code class="js" data-noescape><Switch>
<Route path="/new" component={New} />
<Redirect from="/old" to="/new">
</Switch></code></pre>
<p class="small left"><Redirect exact> and <Redirect strict></p>
<pre><code class="js" data-noescape><Switch>
<Route path="/new" component={New} />
<Redirect exact strict from="/old/path/" to="/new">
</Switch></code></pre>
</section>
<section>
<p class="small left">Override the default repalce</p>
<pre><code class="js" data-noescape><Redirect push to="/about">About</Redirect></code></pre>
</section>
<section>
<ul>
<li>Redirect from Legacy URL <a class="small inline" href="http://127.0.0.1:8014/" target="_blank">Example #14</a></li>
<li>Not Found (404) page using Redirect <a class="small inline" href="http://127.0.0.1:8015/" target="_blank">Example #15</a></li>
<li>Not Found page using Route with no path <a class="small inline" href="http://127.0.0.1:8016/" target="_blank">Example #16</a></li>
<li>Not Found page using Route with * path <a class="small inline" href="http://127.0.0.1:8017/" target="_blank">Example #17</a></li>
</ul>
</section>
<section>
<h2>Route render methods and props</h2>
</section>
<section>
<h3>Route render methods</h3>
<p class="small">There are 3 ways to render something with a <Route>:</p>
<ul>
<li><Route <span class="router-red">component</span>></li>
<li><Route <span class="router-red">render</span>></li>
<li><Route <span class="router-red">children</span>></li>
</ul>
<p class="small left">P.S. You'll have to choose</p>
</section>
<section>
<h3>Route props</h3>
<p class="small">All the 3 render methods will be passed the same 3 route props:</p>
<ul>
<li>match</li>
<li>location</li>
<li>history</li>
</ul>
</section>
<section>
<h4>match</h4>
<p class="small left">object contains information about how a <Route path> matched the URL.</p>
<pre><code class="js">props: {
match: {
path: '/about/:name', // The path pattern used to match.
url: '/about/joe', // The matched portion of the URL.
isExact: true, // true if the entire URL was matched.
params: { // Key/value pairs parsed from the URL,
name: 'joe' // corresponding to the dynamic segments
} // of the path
}
}</code></pre>
</section>
<section>
<h4>location</h4>
<p class="small left">object contains current location and passed state</p>
<pre><code class="js">props: {
location: {
key: 'ac3df4', // not with HashHistory!
pathname: '/somewhere'
search: '?some=search-string',
hash: '#howdy',
state: {
[userDefined]: true
}
}
}</code></pre>
</section>
<section>
<h4>history</h4>
<p class="small left">object refers to the history package, which is one of only 2 major dependencies of React Router (besides React itself), and which provides several different implementations for managing session history in JavaScript in various environments:</p>
<ul>
<li>Browser history</li>
<li>Hash history</li>
<li>Memory history</li>
</ul>
<p class="small right"><a href="https://github.com/ReactTraining/history">https://github.com/ReactTraining/history</a></p>
</section>
<section>
<h4>history</h4>
<pre><code class="js" style="max-height: none;">history: {
length: 10 // The number of entries in the history stack
action: 'PUSH' // The current action (PUSH, REPLACE, or POP)
location: {} // The current location object
push(path, [state]) // Pushes a new entry onto the history stack
replace(path, [state]) // Replaces the current entry on the history stack
go(n) // Moves the pointer in the history stack by n entries
goBack() // Equivalent to go(-1)
goForward() // Equivalent to go(1)
block(prompt) // Prevents navigation (see the history docs)
}</code></pre>
</section>
<section>
<p><Route component> with match parameter</p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;"><Route path="/user/:username" component={User}/>
const User = ({ match }) => {
return <h1>Hello {match.params.username}!</h1>
}</code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8018/" target="_blank">Example #18</a></p>
</div>
</section>
<section>
<p class="small left">Custom match parameters</p>
<pre><code class="js" style="max-height: none;">// Set custom match parameters in the Route
<Route path="/:company/:division" component={About}/>
// Access the value in component like so:
<div>About {match.params.division} division of {match.params.company}</code></pre>
<p class="small left">path can be any valid URL path that path-to-regexp understands.</p>
<p class="small right"><a href="https://www.npmjs.com/package/path-to-regexp">https://www.npmjs.com/package/path-to-regexp</a></p>
</section>
<section>
<p class="small left">Custom match parameters support regexp matches</p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">/optional/:param? // /optional, /optional/foo
/optional/:param* // /optional, /optional/foo/, optional/foo/bar
/optional/:param+ // /optional/foo/, optional/foo/bar
/number/(\d+) // /number/1, 123, 12345
/number/(\d{1,3}) // /number/123
/phone/(\d{3})-(\d{3})-(\d{4}) // /phone/067-123-4567
/date/:iso(\d{4}-\d{2}-\d{2}) // /date/2018-12-31, ISO 8601 format date
/time/:hh(\d{2})::mm(\d{2}) // /time/10:45
/:key/:value(\d+) // /iq/80, /weight/150</code></pre>
</div>
<p class="small right"><a href="https://pshrmn.github.io/route-tester/">https://pshrmn.github.io/route-tester/</a></p>
</section>
<section>
<p><Route render></p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">// Inline rendering
<Route path="/home" render={() => <div>Home</div>}/>
// Wrapping, passing data
const BooksList = ({ books }) => (<ul>
{books.map(book => (<li key={book.id}>{book.title}</li>))}
</ul>);
const BooksListWithDataPassed = (props) => {
const books = [ { id: 1, title: 'bukvar'}, ... ]; // data
return (<BooksList {...props} books={books} />);
}
<Route path="/books" render={BooksListWithDataPassed} />
</code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8019/" target="_blank">Example #19</a></p>
</div>
</section>
<section>
<p><Route children></p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">// children is rendered always, but when it didn't match, match is null
const RenderMeAnyway = ({ match }) => (
match
? (<div>I matched!</div>)
: (<div>I didn't match, but still rendered</div>)
);
<Route path="/match" children={RenderMeAnyway} /></code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8020/match" target="_blank">Example #20</a></p>
</div>
</section>
<section>
<p>Protected Route</p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">const Login = () => (<div>You must log in</div>);
const Admin = () => (<div>Welcome to admin zone</div>);
const ProtectedRoute = (props) => (
authService.checkAuth()
? (<Admin {...props} />)
: (<Redirect to="/" />)
);
const App = () => (
<Router>
<Route exact path="/" component={Login} />
<Route path="/admin" render={ProtectedRoute}/>
</Router>
);</code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8021/" target="_blank">Example #21</a></p>
</div>
</section>
<section>
<p>Nested Routes</p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">const App = () => (
<Router>
<Route path="/tacos" component={Tacos}/>
</Router>
);
const Tacos = () => (
<Route path="/tacos/carnitas" component={Carnitas} />
);</code></pre>
</div>
</section>
<section>
<p>Nested Routes with match</p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">const App = () => (
<Router>
<Route path="/tacos" component={Tacos}/>
</Router>
);
const Tacos = ({ match }) => (
<Route path={match.url + '/carnitas'} component={Carnitas} />
);</code></pre>
</div>
</section>
<section>
<p>withRouter()</p>
<p class="small left">The match, location and history props are only available to the component immediately rendered by Route. In case you need to access them in a deeper level component you may either forward them down in props, or use withRouter. withRouter HOC will pass the closest Route's match, location, and history props to the wrapped component whenever it renders.</p>
</section>
<section>
<p>withRouter()</p>
<pre><code class="js" style="max-height: none;">import React, { Component } from 'react';
import { withRouter } from 'react-router';
class ShowTheLocation extends Component {
render() {
const { match, location, history } = this.props
return (<div>You are now at {location.pathname}</div>);
}
}
export default withRouter(ShowTheLocation);</code></pre>
</section>
<section>
<p>Navigate programmatically</p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">import React, { Component } from 'react';
import { withRouter } from 'react-router-dom';
class UseHistory extends Component {
goAway = () => this.props.history.push('/away');
render() {
return (
<button onClick={this.goAway}>Go Away</button>
);
}
}
export default withRouter(ShowMatchUseHistory);</code></pre>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8022/" target="_blank">Example #22</a></p>
</div>
</section>
<section>
<p>React Router API Hooks</p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">import { useRouteMatch, useLocation, useHistory, useParams } from 'react-router-dom';
const DeepComponent = () => { // not a "route component", far deep from Route
const match = useRouteMatch();
const location = useLocation();
const history = useHistory();
const params = useParams();
return (
<>
<div>match.path: {match.path}</div>
<div>location.pathname: {location.pathname}</div>
<div>params.answer: {params.answer}</div>
<button onClick={() => history.push('/home')}>Go Home</button>
</>
);
};</code></pre>
<!-- <p class="right link-over-code"><a class="small" href="http://127.0.0.1:8022/" target="_blank">Example #22</a></p> -->
</div>
</section>
<section>
<p>Transition Animation</p>
<div style="position: relative">
<pre><code class="js" style="max-height: none;">import { TransitionGroup, CSSTransition } from "react-transition-group";
<Route
render={({ location }) => (
<TransitionGroup>
<CSSTransition key={location.key} classNames="fade" timeout={5000}>
<Switch location={location}>
<Route path="/" exact component={Home} />
<Route path="/about" component={About} />
</Switch>
</CSSTransition>
</TransitionGroup>
)}
/></code></pre>
<p class="right link-over-code right link-over-code_level3"><a class="small" href="http://127.0.0.1:8023/" target="_blank">Example #23</a></p>
<p class="right link-over-code right link-over-code_level2"><a class="small" href="http://127.0.0.1:8024/" target="_blank">Example #24</a></p>
<p class="right link-over-code"><a class="small" href="http://127.0.0.1:8025/" target="_blank">Example #25</a></p>
</div>
</section>
<section data-background-image="assets/bg_routes.webp">
<h1 class="left"><span class="router-red">Thank You</span></h1>
<br><br><br><br>
<h2 class="right">Oleksiy <span class="router-red cyrillic">Лёша</span> Dubovyk</h2>
<p class="small right">
<a class="inline invert" href="https://github.com/dubbha/react-router-lecture" target="_blank">github.com/dubbha/react-router-lecture</a><br>
<a class="inline invert" href="https://github.com/dubbha/react-router-examples" target="_blank">github.com/dubbha/react-router-examples</a>
</p>
</section>
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