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React Router 2

Introduction

Index

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import 'bootstrap/dist/css/bootstrap.min.css';
import 'font-awesome/css/font-awesome.min.css';

import 'jquery';
import 'popper.js';
import 'bootstrap';

import React from 'react';
import ReactDOM from 'react-dom/client';
import {
    createBrowserRouter,
    RouterProvider,
} from "react-router-dom";

import './site.css';
import Root from './routes/Root';
import ErrorPage from './routes/ErrorPage';
import Login from './routes/Login';
import Register from './routes/Register';

const router = createBrowserRouter([
    {
        path: "/",
        element: <Root />,
        errorElement: <ErrorPage />,
        children: [
            {
                path: "login/",
                element: <Login />,
            },
            {
                path: "register/",
                element: <Register />,
            },
        ],
    },

]);

ReactDOM.createRoot(
    document.getElementById('root') as HTMLElement
).render(
    <React.StrictMode>
        <RouterProvider router={router} />
    </React.StrictMode>
);

Index.html

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<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8" />
  <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <meta name="theme-color" content="#000000" />
  <meta name="description" content="Web site created using create-react-app" />
  <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
  <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
  <title>React App</title>
</head>

<body id="root">
  <noscript>You need to enable JavaScript to run this app.</noscript>
</body>

</html>

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import { Outlet } from "react-router-dom";

import Footer from "../components/Footer";
import Header from "../components/Header";

const Root = () => {
    return (
        <>
            <Header />
            <div className="container">
                <main role="main" className="pb-3">
                <Outlet />
                </main>
            </div>
            <Footer />
        </>
    );
}

export default Root;

ErrorPage

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import { useRouteError } from "react-router-dom";

const ErrorPage = () => {
    const error : any = useRouteError();
    console.error(error);


    return (
        <div id="error-page">
            <h1>Oops!</h1>
            <p>Sorry, an unexpected error has occurred.</p>
            <p>
                <i>{error.statusText || error.message}</i>
            </p>
        </div>
    );
}

export default ErrorPage;

Header 

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import { Outlet, Link } from "react-router-dom";

const Header = () => {
    return (
        <header>
            <nav className="navbar navbar-expand-sm navbar-toggleable-sm navbar-light bg-white border-bottom box-shadow mb-3">
                <div className="container">
                    <a className="navbar-brand" href="/">WebApp</a>
                    <button className="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target=".navbar-collapse" aria-controls="navbarSupportedContent"
                        aria-expanded="false" aria-label="Toggle navigation">
                        <span className="navbar-toggler-icon"></span>
                    </button>
                    <div className="navbar-collapse collapse d-sm-inline-flex justify-content-between">
                        <ul className="navbar-nav flex-grow-1">
                            <li className="nav-item">
                                <Link to={"/"} className="nav-link text-dark">Home</Link>
                            </li>
                        </ul>

                        <ul className="navbar-nav">
                            <li className="nav-item">
                                <Link to={"register/"} className="nav-link text-dark">Register</Link>
                            </li>
                            <li className="nav-item">
                                <Link to={"login/"} className="nav-link text-dark">Login</Link>
                            </li>
                        </ul>
                    </div>
                </div>
            </nav>
        </header>
    );
}

export default Header;