react-router

Basic Routing

This code demonstrates how to set up basic routing in a React application using react-router. It includes navigation links and route components that render different components based on the URL path.

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

function App() {
  return (
    <Router>
      <div>
        <nav>
          <ul>
            <li>
              <Link to='/'>Home</Link>
            </li>
            <li>
              <Link to='/about'>About</Link>
            </li>
          </ul>
        </nav>

        <Route exact path='/' component={Home} />
        <Route path='/about' component={About} />
      </div>
    </Router>
  );
}

function Home() {
  return <h2>Home</h2>;
}

function About() {
  return <h2>About</h2>;
}

Dynamic Routing

This code snippet shows how to implement dynamic routing with path parameters. The User component will render with the appropriate user ID based on the URL.

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

function App() {
  return (
    <Router>
      <div>
        <ul>
          <li>
            <Link to='/users/1'>User 1</Link>
          </li>
          <li>
            <Link to='/users/2'>User 2</Link>
          </li>
        </ul>

        <Route path='/users/:id' component={User} />
      </div>
    </Router>
  );
}

function User({ match }) {
  return <h2>User ID: {match.params.id}</h2>;
}

Nested Routing

Nested routing allows you to create routes within routes. This example shows a Layout component with a nested Dashboard route.

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

function App() {
  return (
    <Router>
      <Route path='/' component={Layout} />
    </Router>
  );
}

function Layout({ match }) {
  return (
    <div>
      <nav>
        <Link to={`${match.url}dashboard`}>Dashboard</Link>
      </nav>
      <Switch>
        <Route path={`${match.path}dashboard`} component={Dashboard} />
      </Switch>
    </div>
  );
}

function Dashboard() {
  return <h2>Dashboard</h2>;
}

Protected Routes

Protected routes are used to restrict access to certain parts of your application. This example shows a route that renders a component only if the user is authenticated, otherwise it redirects to a login page.

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

function App() {
  return (
    <Router>
      <Route path='/protected' render={() => (
        isAuthenticated() ? (
          <ProtectedComponent />
        ) : (
          <Redirect to='/login' />
        )
      )} />
    </Router>
  );
}

function isAuthenticated() {
  // Authentication logic here
  return true;
}

function ProtectedComponent() {
  return <h2>Protected</h2>;
}