Learn

So far, all the routes we’ve covered have been static, which means they match a single unique path. This works for certain types of routes, but not all.

For example, imagine in a tech news site where every article is accessible at the path '/articles/' + someTitle where someTitle is different for each article. Specifying a unique route for every article would not only be verbose and time-consuming, it would require an impractical amount of maintenance should the path structure ever change.

Instead, we would rather express the pattern at a high level with a single route that can match any path of the form '/articles/' + someTitle and still know which article to render. React Router allows us to do this by using URL parameters to create dynamic routes.

URL parameters are dynamic segments of a URL that act as placeholders for more specific resources the URL is meant to display. They appear in a dynamic route as a colon (:) followed by a variable name, like so:

<Route path='/articles/:title'>
  <Article />
</Route>

Let’s break down this short, yet powerful demonstration of URL parameters:

In this example, the path '/articles/:title' contains the URL parameter :title.
This means that when the user navigates to pages such as '/articles/what-is-react' or '/articles/html-and-css', the <Article /> component will render.
When the Article component is rendered in this way, it can access the actual value of that :title URL parameter (what-is-react or html-and-css) to determine which article to display (more on this in the next exercise).

A single route can even have multiple parameters (eg. '/articles/:title/comments/:commentId') or none (eg. '/articles').

To make a URL parameter optional, you can append a '?' to the end of the URL parameter’s name (eg. '/articles/:title?'). In this case, the child component of the Route will render when the URL matches either /articles/what-is-react or just /articles.

Instructions

Task 1

Navigate to App.js. Within the <main> section, add a dynamic route with a URL parameter that renders the Article component whenever the URL path matches paths such as '/articles/objects' or '/articles/browser-compatibility'.

Name the URL parameter in the route’s path prop :title.

To confirm that your code works, navigate to http://localhost:3000/articles/objects or try clicking on one of the links in the /articles page.

Hint

To add a dynamic route, render the Route component and make sure that its path prop includes a dynamic segment (a segment beginning with a colon). Your code should look like this:

<Route>
  <MyComponent path='/path/:param' />
</Route>

Task 2

Add another dynamic route with a URL parameter that renders the Author component whenever the URL path matches paths such as '/authors/maria' or '/authors/samir'.

Name the URL parameter in the route’s path prop :name.

To confirm that your code works, navigate to http://localhost:3000/authors/Lily. You should see the header “Articles by REPLACE ME” rather than the articles by the author Lily. In the exercise, we’ll fix this.

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