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September 9, 2020 05:02 am GMT

Build a React sidebar navigation component

In this tutorial well be building a slide-out sidebar navigation component. Traditionally this type of navigation was implemented on mobile devices but its becoming common practice to use them on desktop devices.

Well be creating pages for each of the links in the navigation so youll also get an introduction to React Router if you havent already.

Lets get started by setting up the project using the React Create App package:

npx react-create-app react-sidebar

The only dependency required is React Router so lets install that as well:

npm install react-router-dom

Create a pages folder in the src directory with home.js, services.js, and contact.js files. These are just placeholder files so we can navigate between the pages in our navigation.

Inside each of the files well render some simple content so we can see when the page has changed. Be sure to replace the function name and text in each file to correspond with the filename:

import React from "react";function Home() {  return (    <div className="page">      <h1>Home</h1>      <p>This is the home page.</p>    </div>  );}export default Home;

Next create a components folder in the src directory with a Sidebar.js and Sidebar.css file:

Inside Sidebar.js add the following imports:

import React, { useState } from "react";import { Link } from "react-router-dom";import "./Sidebar.css";useState hook will be used to store the active state of the navigation and Link is used to render the links.

Next add a Sidebar() function as follows:

function Sidebar() {  const [sidebar, setSidebar] = useState(false);  const showSidebar = () => setSidebar(!sidebar);  return (    <nav className={sidebar ? "sidebar active" : "sidebar"}>      <button className="hamburger" type="button" onClick={showSidebar}>        <div></div>      </button>      <ul onClick={showSidebar}>        <li><Link to="/">Home</Link></li>        <li><Link to="/services">Services</Link></li>        <li><Link to="/contact">Contact</Link></li>      </ul>    </nav>  );}export default Sidebar;

When the onClick is triggered we set the sidebar state to true which adds an active class. Youll see later when CSS is applied that the active class shifts the position of the sidebar from offscreen to the left edge.

<Link> renders a fully accessible anchor tag which contains the URL that we'll route to the corresponding file in the pages folder.

With the sidebar component completed when can now load it into App.js and setup the routes, but first the imports:

import React from "react";import { BrowserRouter as Router, Switch, Route } from "react-router-dom";import Home from "./pages/Home";import Services from "./pages/Services";import Contact from "./pages/Contact";import Sidebar from "./components/Sidebar";import "./App.css";

Then edit the App() function as follows:

function App() {  return (    <>      <Router>        <Sidebar />        <Switch>          <Route path="/" exact component={Home} />          <Route path="/services" component={Services} />          <Route path="/contact" component={Contact} />        </Switch>      </Router>    </>  );}export default App;

<Router> is the primary component of React Router thats responsible for keeping the UI and the URL in sync. looks through all its children elements and renders the first one with a path matching the current URL.

Thats it for the JavaScript we can now add some CSS inside Sidebar.css.

First well set the default position of the sidebar off-screen. Then when the active class is triggered its position changes to align on the left side of the browser. As the sidebar has a transition itll animate into position.

.sidebar {  position: fixed;  top: 0;  left: -300px;  width: 300px;  height: 100%;  background-color: peru;  transition: left 300ms ease-out;}.sidebar.active {  left: 0;}

Next some basic style for each of the links in the navigation:

.sidebar ul {  margin: 0;  padding: 0;}.sidebar li {  list-style: none;}.sidebar li a {  font-size: 18px;  text-decoration: none;  padding: 10px;  display: block;  color: #fff;}

A hamburger (menu) icon can be created with CSS:

.hamburger {  border: none;  outline: 0;  width: 50px;  position: absolute;  right: -50px;  background-color: peru;}.hamburger:after,.hamburger:before,.hamburger div {  background-color: #fff;  height: 5px;  margin: 7px 0;  border-radius: 3px;  content: "";  display: block;  transition: all 300ms ease-in-out;}

Finally we can transform the hamburger icon into a cross icon when the sidebar is active:

.sidebar.active .hamburger:before {  transform: translateY(12px) rotate(135deg);}.sidebar.active .hamburger::after {  transform: translateY(-12px) rotate(-135deg);}.sidebar.active .hamburger div {  transform: scale(0);}

This CSS hides the middle row of the hamburger icon and rotates the top (:before) and bottom (:after) rows to form a cross.

Original Link: https://dev.to/michaelburrows/build-a-react-sidebar-navigation-component-2j4i

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