Michael J. Larocca

Posted on Jul 22 • Updated on Aug 26 • Originally published at selftaughttxg.com

How to Set Up Dynamic Routing with React Router

#react #tutorial #codenewbie

Join me as I continue building a React website with the help of my Hashnode AI assistant! This article covers React Router, exploring dynamic routing, setting up routes, and navigating between pages!

Article Concept Overview

The problem:

React projects are single-page applications with a single URL. However, libraries like react-share require unique URLs for each page you want to share within your project.

The solution:

Incorporate React Router to create separate URL paths in your single-page React project.

React Router Concepts Covered

In this article, we will cover the following React Router concepts:

useParams: A hook that extracts parameters from the URL, allowing you to access dynamic segments of the URL.
useNavigate: A hook that provides a function to programmatically navigate between routes.
Link: A component that creates navigable links, allowing users to navigate without refreshing the page.
useLocation: A hook that provides access to the current location object, which contains information about the current URL.
BrowserRouter as Router, Route, Routes: Components used to define and manage routes in a React application. BrowserRouter wraps the entire application, while Route and Routes define individual routes and their corresponding components.

Introduction to React Router

React Router is a library for routing in React applications, enabling single-page applications with navigation without refreshing the page. Unlike traditional websites that send URL requests to the server to load new pages, React Router creates URL paths that correspond to different components within your React application. This means it dynamically renders React components based on the current URL path, rather than loading separate web pages.

By using React Router, you can create a more seamless and efficient user experience. When a user navigates to a different section of your application, React Router updates the URL and renders the appropriate component without making a new server request. This approach improves performance and provides a smoother, more responsive user interface.

To properly incorporate the react-share library into my project, integrating React Router first was the solution!

Note: In my project and article, we use React Router v6. This version introduces several new features and improvements, such as the Routes and Route components, as well as the useNavigate hook for programmatic navigation.

Integrating React Router for use with React Share Library

For this article, I will cover how I integrated React Router in my Star Wars Ahsoka project for the specific use case of using the react-share library.

So, what is the React Share library? The React Share library is a React component library that provides social media share buttons. It allows you to easily add buttons to share content on various social media platforms like Facebook, Twitter, LinkedIn, and more.

Prerequisites

Building on the series of articles about creating a "Star Wars Ahsoka React website," understanding the implementation of React Router requires familiarity with certain concepts. Please refer to my previous articles to understand the custom components and functions used.

The prerequisites include familiarity with the:

Navbar component
Hamburger menu component
SmallCardContent component
mapItems function
NewsArticle component

Article Series:

Installation

First, you need to install React Router. You can do this using npm or yarn. I used npm.

npm install react-router-dom
# or
yarn add react-router-dom

Sharing Articles With the React Share Library

You will see the Twitter/X and LinkedIn icons from the React Share library at the bottom right side of the image below.

When you click on a social share icon from the React Share library, it typically opens a new window or tab that directs you to the selected social media platform's sharing interface. This interface is pre-filled with the URL and other relevant information (like the title or description) of the content you want to share. You can then customize the post further if needed and proceed to share it on your social media profile.

The problem:

Although my Star Wars React project properly rendered each article, the React Share library used my base URL for every article. This resulted in Twitter/X and LinkedIn posts that always led back to my main page, regardless of the current state of my React app, when I clicked the social share icon.

The solution:

I had to incorporate React Router, which created unique URL paths for each Star Wars news article I wanted to share.

The Route Component

Unlike traditional websites that consist of separate web pages, React Router uses route components. Each URL path is mapped to a specific React component, which is dynamically rendered without making a new server request.

A route component in React Router is rendered when the URL path matches a specified route. Defined within a Route element, it enables seamless navigation by dynamically rendering the appropriate component without refreshing the page.

This example code sets up a route that renders the MainPage component when the user visits the root URL of the application:

<Route>: This is a React Router component used to define a route.
path="/": This specifies the URL path for the route. In this case, it is the root path ("/"), which means this route will match the main URL of the application.
element={<MainPage />}: This specifies the React component to be rendered when the URL path matches the specified path. In this case, when the user navigates to the root URL ("/"), the MainPage component will be rendered.
```
<Route path="/" element={<MainPage />} />
```

The Routes Component

All of the individual <Route> components go inside of the <Routes> component.

The <Routes> component is a container for all the <Route> components. It ensures that only the first matching route is rendered.

<Routes>
  <Route path="/" element={<MainPage />} />
  <Route path="/news" element={<NewsList />} />
  <Route path="/article/:storyNumber" element={<NewsArticle />} />
  <Route path="*" element={<NotFound />} />
</Routes>

The <Routes> component contains multiple <Route> components, each defining a different path and the corresponding component to render.

The Router Component

The <Router> component (specifically BrowserRouter in this case) is used to wrap the entire application. It provides the routing context to the rest of the app.

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

function App() {
  return (
    <Router>
      <Routes>
        <Route path="/" element={<MainPage />} />
        <Route path="/news" element={<NewsList />} />
        <Route path="/article/:storyNumber" element={<NewsArticle />} />
        <Route path="*" element={<NotFound />} />
      </Routes>
    </Router>
  );
}

The <Router> component wraps the entire application. This setup ensures that the routing context is available throughout the app, enabling seamless navigation between different components and pages.

My Navbar Component

Now, it's time to refactor the code in my project. After integrating React Router into my existing project, I needed to update the code to ensure the Navbar appears at the top of every page. This entailed removing my Navbar component from all of the other components that rendered it.

To properly render the Navbar component using React Router, it needs to be placed within the <Router> component, above the <Routes> component:

<Navbar />

function App() {
  return (
    <Router>
      <Navbar />
      <Routes>
        <Route path="/" element={<MainPage />} />
        <Route path="/news" element={<NewsList />} />
        <Route path="/article/:storyNumber" element={<NewsArticle />} />
        <Route path="*" element={<NotFound />} />
      </Routes>
    </Router>
  );
}

Organizing My Routes

Since most of my Star Wars React project is rendered from the root URL (the main page), I created additional routes only for the news and article pages and added a route for a 404 page.

The News Path

In my React application, the "/news" path displays a list of news articles. When users navigate to this path, the NewsList component is rendered. This component uses the mapItems function to generate clickable links for each news article.

How It Works

Route Definition: In the App component, I define a route for the "/news" path that renders the NewsList component.
```
<Route path="/news" element={<NewsList />} />
```
Navigating to Individual Articles: When users click on an article link, they are navigated to the corresponding article page. React Router dynamically renders the specific article component without refreshing the entire application.

Here is the news URL path that renders the article links:

https://react-dynamic-elements-starwars-cards.netlify.app/news

NewsList Component

The News URL

In the NewsList component, we use the mapItems function to generate a list of news articles. Each article is wrapped in a Link component, which creates a clickable link for the user. The "/article" path is used as the base URL for these links.

When a user clicks on an article, they are navigated to a unique URL that includes the article's identifier. For example, if an article has an identifier of 1, the URL will be "/article/1". This allows React Router to dynamically render the specific article page without refreshing the entire application.

Here's a brief look at the relevant part of theNewsListcomponent:

<section className="small-card-container">
  {mapItems(
    selectedCategory,
    StarWarsCard,
    setSelectedItem,
    selectedItem,
    SmallCardContent,
    "/article"
  )}
</section>

Using useLocation in the mapItems Function

The mapItems function generates a list of items, each wrapped in a Link component for navigation. It uses the useLocation hook from React Router to access the current URL path and conditionally render components based on the path.

How It Works

Accessing the Current Location: Inside the mapItems function, useLocation is called to get the current location object.
```
const location = useLocation();
```

Generating Items: The function iterates over the items array and generates a component for each item. It checks if the current path is not "/news" and sets the isSelected property accordingly.

return items.map((item, index) => {
    const isSelected = location.pathname !== '/news' && (selectedItem ? selectedItem === item : index === 0);
    const contentProps = {
        ...item,
        isSelected
    };

    const card = (
        <Component 
            key={index} 
            type="div" 
            contentType={contentType} 
            contentProps={contentProps} 
            layout="small-card" 
            theme="dark-theme" 
            interaction="clickable" 
            onClick={() => setSelectedItem(item)} 
        />
    );

    if (linkPath) {
        return (
            <Link to={`${linkPath}/${item.story}`} key={item.story}>
                {card}
            </Link>
        );
    }

    return card;
});

Creating Links: If a linkPath is provided, each item is wrapped in a Link component, creating a clickable link that navigates to the specified path with the item's identifier.

The use of useLocation ensures that the current path is considered when rendering the items, providing context-aware navigation.

NewsArticle Component

The Articles URLs

The NewsArticle component is designed to display individual news articles based on the URL path. Here's how it works with React Router and the NewsList component:

Extracting the URL Parameter: The useParams hook is used to extract the storyNumber from the URL.
Fetching the Article: The storyNumber is used to fetch the corresponding article from the news data.
Handling Non-Existent Articles: If the storyNumber does not match any article, the NotFound component is rendered.
Rendering the Article Content: If the article exists, its content is rendered, including the name and subtitle.

function NewsArticle() {
  const { storyNumber } = useParams();
  const article = news[storyNumber];

  if (!article) {
    return <NotFound />;
  }

  return (
    <div>
      <h1>{article.name}</h1>
      <h4>{article.sub_title}</h4>
      {/* Render article content */}
    </div>
  );
}

Displaying the Article Content

The article content is dynamically generated based on the data structure. Paragraphs and images are rendered accordingly.

const articleContent = [];
for (let key in news[storyNumber]) {
  if (key.startsWith('paragraph')) {
    articleContent.push({ type: 'paragraph', text: news[storyNumber][key] });
  } else if (key.startsWith('image') && !news[storyNumber][key].includes('title')) {
    articleContent.push({ type: 'image', src: news[storyNumber][key], alt: key });
  }
}

Integration with NewsList

The NewsList component uses the mapItems function to generate links for each article. When a user clicks on an article link, they are navigated to the NewsArticle component with the appropriate storyNumber in the URL.

This setup allows for seamless navigation between the list of news articles and individual article pages, enhancing the user experience without page reloads.

<section className="small-card-container">
  {mapItems(
    news,
    StarWarsCard,
    setSelectedItem,
    selectedItem,
    SmallCardContent,
    "/article"
  )}
</section>

Here is the news URL path that renders the first article:

https://react-dynamic-elements-starwars-cards.netlify.app/article/0

The Finished NewsArticle Component

Note: I covered the creation of these dynamically rendered <p> and <img> tags in my previous article, and I will be covering the react-share portions of this component in my next article.

import { TwitterShareButton, TwitterIcon, LinkedinShareButton, LinkedinIcon } from 'react-share';
import BB8 from "../images/news/BB8.jpeg";
import React, { useState, useEffect } from "react";
import { useParams } from "react-router-dom";
import { news } from "../data.js";
import StarWarsCard from "../components/StarWarsCard";
import SmallCardContent from "../components/SmallCardContent";
import { mapItems } from "../utils/mapFunctions.jsx";
import NotFound from './NotFound.jsx'; // Ensure this import is added
import "../App.css";

const Article = ({ content }) => {
  return (
    <div>
      {content.map((item, index) => {
        if (item.type === 'paragraph') {
          return <p key={index}>{item.text}</p>;
        } else if (item.type === 'image') {
          return <img key={index} src={item.src} alt={item.alt} className="news__image-body" />;
        }
        return null;
      })}
    </div>
  );
};

function NewsArticle() {
  const { storyNumber } = useParams();
  const [selectedItem, setSelectedItem] = useState(news[storyNumber] || null);

  const articleContent = [];
  const [shareUrl, setShareUrl] = useState(window.location.href);
  const [title, setTitle] = useState(news[storyNumber]?.name || '');
  const [hashtags, setHashtags] = useState(['StarWars', 'News']);

  // State for Twitter icon
  const [twitterBgColor, setTwitterBgColor] = useState('black');
  const [twitterIconColor, setTwitterIconColor] = useState('white');

  // State for LinkedIn icon
  const [linkedinBgColor, setLinkedinBgColor] = useState('black');
  const [linkedinIconColor, setLinkedinIconColor] = useState('white');

  // Event handlers for Twitter icon
  const handleMouseEnterTwitter = () => {
    setTwitterBgColor('lightgray');
    setTwitterIconColor('black');
  };

  const handleMouseLeaveTwitter = () => {
    setTwitterBgColor('black');
    setTwitterIconColor('white');
  };

  // Event handlers for LinkedIn icon
  const handleMouseEnterLinkedin = () => {
    setLinkedinBgColor('lightgray');
    setLinkedinIconColor('black');
  };

  const handleMouseLeaveLinkedin = () => {
    setLinkedinBgColor('black');
    setLinkedinIconColor('white');
  };

  useEffect(() => {
    if (!news[storyNumber]) {
      setSelectedItem(null);
    } else {
      setSelectedItem(news[storyNumber]);
      setShareUrl(window.location.href);
      setTitle(news[storyNumber].name);
      setHashtags(['StarWars', 'News']);
    }
  }, [storyNumber]);

  if (!news[storyNumber]) {
    return <NotFound />;
  }

  for (let key in news[storyNumber]) {
    if (key.startsWith('paragraph')) {
      articleContent.push({ type: 'paragraph', text: news[storyNumber][key] });
    } else if (key.startsWith('image') && !news[storyNumber][key].includes('title')) {
      articleContent.push({ type: 'image', src: news[storyNumber][key], alt: key });
    }
  }

  return (
    <>
    <section className="small-card-container">
      {mapItems(
        news,
        StarWarsCard,
        setSelectedItem,
        selectedItem,
        SmallCardContent,
        "/article"
      )}
    </section>
    <div className="ctn-news">
      <img src={news[storyNumber].image} alt="Placeholder" className="news__image-main" />
      <div className="news__title">
        <h1>{news[storyNumber].name}</h1>
        <h4>{news[storyNumber].sub_title}</h4>
      </div>
      <div className="news__about">
        <div className="ctn-news-header">
          <img src={BB8} width="50px" height="50px" alt="Placeholder" className="news__image-author" />
          <div>
            <p className="ctn-news-author gray"><strong>By:</strong> {news[storyNumber].by}</p>
            <p className="ctn-news-date gray"><strong>date:</strong> {news[storyNumber].date}</p>
          </div>
        </div>
        <div className="news__social-icons">
          <div>
            <TwitterShareButton url={shareUrl} title={title} hashtags={hashtags}>
              <TwitterIcon size={32} round bgStyle={{ fill: twitterBgColor }} iconFillColor={twitterIconColor} onMouseEnter={handleMouseEnterTwitter} onMouseLeave={handleMouseLeaveTwitter} className="social-icons"/>
            </TwitterShareButton>
            <LinkedinShareButton url={shareUrl} title={title}>
              <LinkedinIcon size={32} round bgStyle={{ fill: linkedinBgColor }} iconFillColor={linkedinIconColor} onMouseEnter={handleMouseEnterLinkedin} onMouseLeave={handleMouseLeaveLinkedin} className="social-icons" />
            </LinkedinShareButton>
          </div>
        </div>
      </div>
      <div className="news__content ctn-news-article">
        <Article content={articleContent} />
      </div>
      <div className="news__footer">
        <footer><strong>StarWars.com. All Star Wars, all the time.</strong></footer>
      </div>
    </div>
    </>
  );
}

export default NewsArticle;

Handling 404 Pages

To handle non-existent routes in my React application, I use a catch-all route that renders the NotFound component. This ensures that users are presented with a friendly error page when they navigate to a URL that doesn't match any defined routes.

How It Works

In the App component, I define a route with the path "*" which acts as a wildcard. This route will match any URL that doesn't correspond to the other defined routes. When such a URL is accessed, the NotFound component is rendered.

<Route path="*" element={<NotFound />} />

The 404 page renders when trying to go to an article number that does not exist:

My Handle Navigation Function

How I solved a routing issue

I had a strange routing issue that was causing errors; If I was on the "/news" URL and then used my dropdown menu to choose a new category, it would render items in the "/news" URL when it needed to render in the root URL "/." This routing issue also led to navigating to pages that did not exist.

I resolved the issue by writing a handleNavigation function that first navigates back to the root URL "/" and then navigates to the desired path. This ensures that the application resets to the root URL before navigating to the new path, preventing any incorrect rendering.

Here's the handleNavigation function:

export const handleNavigation = (navigate, path, setTimeout) => {
    navigate('/');
    setTimeout(() => {
      navigate(path);
    }, 0);
  };

The Completed App

import { useState, useEffect } from 'react';
import { BrowserRouter as Router, Route, Routes } from 'react-router-dom';
import Navbar from './components/Navbar';
import MainPage from './components/MainPage';
import NewsList from './components/NewsList';
import Article from './components/Article';
import NewsArticle from './components/News';
import NotFound from './components/NotFound.jsx';
import {
  characters,
  creatures,
  droids,
  locations,
  organizations,
  vehicles,
  weapons_and_tech,
  youtube,
  mainpage,
  news,
} from './data.js';

function App() {
  const [selectedItem, setSelectedItem] = useState(null);
  const [selectedCategory, setSelectedCategory] = useState(mainpage);
  const [showCarousel, setShowCarousel] = useState(false);

  const categories = {
    characters,
    creatures,
    droids,
    locations,
    organizations,
    vehicles,
    weapons_and_tech,
    youtube,
    mainpage,
    news,
  };

  useEffect(() => {
    if (selectedCategory && selectedCategory.length > 0) {
      setSelectedItem(selectedCategory[0]);
    }
  }, [selectedCategory]);

  return (
    <Router>
      <Navbar
        categories={categories}
        setSelectedCategory={setSelectedCategory}
        setShowCarousel={setShowCarousel}
      />
      <Routes>
        <Route
          path="/"
          element={
            <MainPage
              selectedCategory={selectedCategory}
              setSelectedCategory={setSelectedCategory}
              selectedItem={selectedItem}
              setSelectedItem={setSelectedItem}
              showCarousel={showCarousel}
              setShowCarousel={setShowCarousel}
            />
          }
        />
        <Route
          path="/news"
          element={
            <NewsList
              selectedCategory={selectedCategory}
              setSelectedCategory={setSelectedCategory}
              selectedItem={selectedItem}
              setSelectedItem={setSelectedItem}
              showCarousel={showCarousel}
              setShowCarousel={setShowCarousel}
            />
          }
        />
        <Route path="/article/:storyNumber" element={<NewsArticle />} />
        <Route path="*" element={<NotFound />} />
      </Routes>
    </Router>
  );
}

export default App;

The Project So Far

Here are the links to the project:

Key Takeaways

Dynamic Routing with React Router: React Router allows you to create dynamic routes in your React applications, enabling seamless navigation without page reloads. This enhances the user experience by providing a more responsive and efficient interface.
Essential Hooks and Components: Understanding and utilizing key React Router hooks and components such as useParams, useNavigate, Link, useLocation, BrowserRouter, Route, and Routes is crucial for effective routing in your applications.
Integration with Other Libraries: The integration of React Router with the React Share library showcases how dynamic routing can be used to create unique URLs for sharing content on social media platforms, solving the issue of static URLs in single-page applications.
Handling 404 Pages: Implementing a catch-all route to handle 404 pages ensures that users are presented with a friendly error page when they navigate to a non-existent route, improving the overall user experience.

Conclusion

When learning React, it's easy to forget you are dealing with a single URL app. In my case, I realized this when trying to implement the react-share library to share news articles on my site via Twitter/X and LinkedIn icons. Despite the currently rendered state of my app, when displaying the article I wanted to share, the react-share library always created a link to the root URL of my website.

To get the react-share library to work in my project, I realized that I would first have to learn React Router, which creates unique URLs. Since I had not structured my app with React Router in mind and had not learned how to use it yet, I knew my work was cut out for me.

By pairing programming with Hashnode's AI, I was able to implement React Router into my project without too many issues. The refactored code in the main app to use React Router makes logical sense when analyzing the Router, Routes, and Route components. However, I ran into a few syntax and implementation issues.

React Router's syntax varies depending on the version you are using. I realized this through trial and error, as my AI assistant kept providing various versions of code. I ultimately used React Router v6 for this project. I also had dynamic URL creation issues while navigating my website using dropdown menus. I resolved this issue by creating a function that first goes to the root directory before navigating to the new path chosen by the user.

With React Router implemented correctly in my project, the react-share library works as expected! Now, when a user chooses an article, a unique URL is created for that specific article, allowing it to be shared accurately on social media platforms.

Consider integrating React Router to improve your React projects with dynamic routing. It creates unique URLs for your content, enhancing your project's functionality, and it may be necessary for certain React libraries!

Do you now feel confident in using React Router in your projects? Have you already implemented dynamic routing in your React applications? Please share the article and comment!

Join me as I continue building a React website with the help of my Hashnode AI assistant! This article covers React Router, exploring dynamic routing, setting up routes, and navigating between pages!

Article Concept Overview

The problem:

The solution:

React Router Concepts Covered

Introduction to React Router

Integrating React Router for use with React Share Library

For this article, I will cover how I integrated React Router in my Star Wars Ahsoka project for the specific use case of using the react-share library.

Prerequisites

Article Series:

Installation

Sharing Articles With the React Share Library

The problem:

The solution:

The Route Component

The Routes Component

The Router Component

My Navbar Component

Organizing My Routes

The News Path

How It Works

NewsList Component

The News URL

Using useLocation in the mapItems Function

How It Works

NewsArticle Component

The Articles URLs

Displaying the Article Content

Integration with NewsList

The Finished NewsArticle Component

Handling 404 Pages

How It Works

My Handle Navigation Function

How I solved a routing issue

The Completed App

The Project So Far

Key Takeaways

Conclusion

Do you now feel confident in using React Router in your projects? Have you already implemented dynamic routing in your React applications? Please share the article and comment!

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