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React Router 4

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React Router 4

01 create-react-app

We use the Facebook React Boilerplate to get started:

create-react-app react-router-4

02 react-bootstrap

And add some Bootstrap for styling:

npm install --save react-bootstrap

We can now add the Bootsrap CSS inside the head of ./public/index.html :

<link rel='stylesheet' href='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css' integrity='sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb' crossorigin='anonymous'>

And the Javascript at the end of the body tag:

<script src='https://code.jquery.com/jquery-3.2.1.slim.min.js' integrity='sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN' crossorigin='anonymous'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js' integrity='sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh' crossorigin='anonymous'></script>
<script src='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js' integrity='sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ' crossorigin='anonymous'></script>

To add a simple Navbar on top, we will now replace the default create-react-app JSX inside ./src/coponents/app.js with a Bootstrap Navbar from their Example list (remember to replace all instances of class with className!):

return (
<div className='App'>
<nav className='navbar navbar-expand-md navbar-dark bg-dark fixed-top mb'>
<a className='navbar-brand' href='#'>React Router 4</a>
<button className='navbar-toggler' type='button' data-toggle='collapse' data-target='#navbarsExampleDefault' aria-controls='navbarsExampleDefault' aria-expanded='false' aria-label='Toggle navigation'>
<span className='navbar-toggler-icon'></span>
</button>

<div className='collapse navbar-collapse' id='navbarsExampleDefault'>
<ul className='navbar-nav mr-auto'>
<li className='nav-item active'>
<a className='nav-link' href='#'>Page 1 <span className='sr-only'>(current)</span></a>
</li>
<li className='nav-item'>
<a className='nav-link' href='#'>Page 2</a>
</li>
</ul>
</div>
</nav>

<div className='jumbotron mt'>
<div className='col-sm-8 mx-auto mt'>
<h1>This is just a Test</h1>
<p>
<a className='btn btn-primary' href='#' role='button'>View navbar docs &raquo;</a>
</p>
</div>
</div>

</div>
);

Now start the app with:

npm start

The Bootstrap Navbar should now show up in our React app on locallhost:3000:

03 react-router-dom

We can now use the basic example from the reacttraining.com website to add some routing to our app. First install the web based router - which is now called react-router-dom:

npm install --save react-router-dom

To add links to our navigation, we will need the \<NavLink/> component, which is special version of the \<Link/> that will add styling attributes to the rendered element when it matches the current URL (activeState). Replace all:

<a href='#'></a>

with

<NavLink to='#'></NavLink>

and import \<NavLink /> from react-router-dom:

import { NavLink } from 'react-router-dom'

We created two links to two components, aptly named /page-1 and /page-2, that we now have to create inside the ./src/components directory. For \<PageOne /> we want to use an ES6 Class Component to render some JSX:

import React, {Component} from 'react'
import { Link } from 'react-router-dom'
import { Button } from 'react-bootstrap'

class PageOne extends Component {
render() {
return (
<div className='jumbotron mt'>
[...]
</div>
);
}
}

export default PageOne

And for \<PageTwo /> we use a Stateless Component:

import React from 'react'
import { Link } from 'react-router-dom'
import { Button } from 'react-bootstrap'


const PageTwo = () => (
<div className='jumbotron mt'>
[...]
</div>
)

export default PageTwo

Make sure to import all components in ./src/index.js:

import App from './App';
import PageOne from './PageOne';
import PageTwo from './PageTwo';

As well as adding the Router itself:

import {
BrowserRouter as Router,
Route,
Link
} from 'react-router-dom'

Now we can copy the navigation (everything inside the \<nav> tag) from ./src/components/app.js to ./src/index.js and replace the \<App /> component that was placed there by create-react-app. Then wrap the JSX into a \<Router> tag:

render(
<Router>
<div className='container'>
<nav className='navbar navbar-expand-md navbar-dark bg-dark fixed-top mb'>
<NavLink className='navbar-brand' to='/'> <img src={Logo} alt='React Router v4' /> </NavLink>

<button className='navbar-toggler' type='button' data-toggle='collapse' data-target='#navbarsExampleDefault' aria-controls='navbarsExampleDefault' aria-expanded='false' aria-label='Toggle navigation'>
<span className='navbar-toggler-icon'></span>
</button>

<div className='collapse navbar-collapse'>
<ul className='navbar-nav mr-auto'>
<li className='nav-item'>
<NavLink className='nav-link' to='/page-1'>Page 1</NavLink>
</li>
<li className='nav-item'>
<NavLink className='nav-link' to='/page-2'>Page 2</NavLink>
</li>
</ul>
</div>
</nav>

<Route exact path='/' component={App}/>
<Route path='/page-1' component={PageOne}/>
<Route path='/page-2' component={PageTwo}/>
</div>
</Router>,

document.getElementById('root'))

04 Nested Routes

To create nested routes in React Router v4, we just have to add more routes inside a component. E.g. you have a route that leads the user from / to /chapter1, rendering the \<Chapter1 /> component. To create a route to a nested article inside the chapter, like /chapter1/subarticle1, we now have to add further routes with the ${match.url} attribute inside the \<Chapter1 />:

<NavLink to={`${match.url}/subarticle1`} />
<Route path={`${match.url}/subarticle1`} component={SubArticle1}/>

So lets add another Link and Route to the Nav component in ./src/index.js to render another component, called \<NestedRoutes />, under /nested-routes. This is going to be our parent component for two nested routes/components: \<PageOneNested /> and \<PageTwoNested /> rendered under ./nested-routes/page-1-nested and ./nested-routes/page-2-nested, respectively.

import React from 'react'
import { Route, NavLink, Link } from 'react-router-dom'

import PageOneNested from './PageOneNested'
import PageTwoNested from './PageTwoNested'

const Topics = ({ match }) => (

<div className='container-fluid'>
<div className='row'>
<nav className='nav nav-pills nav-fill col-sm-3 col-md-2 d-none d-sm-block bg-light sidebar'>
<div className='clearfix'><br/><br/><br/></div>
<Link className='nav-item nav-link' to={match.url}>
<h3>Nested Routes</h3>
<hr/>
</Link>
<NavLink className='nav-item nav-link' to={`${match.url}/page-1-nested`}>
NestOne
</NavLink>
<NavLink className='nav-item nav-link' to={`${match.url}/page-2-nested`}>
NestTwo
</NavLink>
</nav>

<main role='main' className='col-sm-9 ml-sm-auto col-md-10 pt-3'>
<div className='clearfix'><br/><br/><br/></div>
<h1>Dashboard</h1>
<Route path={`${match.url}/page-1-nested`} component={PageOneNested}/>
<Route path={`${match.url}/page-2-nested`} component={PageTwoNested}/>
<Route exact path={match.url} render={() => (
<div>
[...]
</div>
)}/>
</main>
</div>
</div>
)

export default Topics

You can create the two files PageOneNested.js and PageTwoNested.js inside ./src/components. Just copy and paste the content from PageOne.js or PageTwo.js and change the component names, inside the file to PageOneNested and PageTwoNested.

React Router 4

Clicking on the NestOne or NestTwo link will load the components \<PageOneNested /> or \<PageTwoNested /> in the \<main> area of the screen, under the Dashboard title - awesome !

05 Loading Animations

The react-transition-group is an easy way to perform animations when a React component enters or leaves the DOM.

npm install react-transition-group --save

https://hackernoon.com/animated-page-transitions-with-react-router-4-reacttransitiongroup-and-animated-1ca17bd97a1a https://medium.com/appifycanada/animations-with-reacttransitiongroup-4972ad7da286 https://github.com/reactjs/react-transition-group/tree/v1-stable