Dynamic routes in Reflex allow you to handle varying URL structures, enabling you to create flexible and adaptable web applications. This section covers regular dynamic routes, catch-all routes, and optional catch-all routes, each with detailed examples.

Regular dynamic routes in Reflex allow you to match specific segments in a URL dynamically. A regular dynamic route is defined by square brackets in a route string / url pattern. For example /users/[id] or /products/[category]. These dynamic route arguments can be accessed through a state var. For the examples above they would be rx.State.id and rx.State.category respectively.

Example:

The [pid] part in the route is a dynamic segment, meaning it can match any value provided in the URL. For instance, /post/5, /post/10, or /post/abc would all match this route.

If a user navigates to /post/5, State.post_id will return 5, and the page will display 5 as the heading. If the URL is /post/xyz, it will display xyz. If the URL is /post/ without any additional parameter, it will display "".

Adding dynamic routes uses the add_page method like any other page. The only difference is that the route string contains dynamic segments enclosed in square brackets.

If you are using the app.add_page method to define pages, it is necessary to add the dynamic routes first, especially if they use the same function as a non dynamic route.

For example the code snippet below will:

But if we switch the order of adding the pages, like in the example below, it will not work:

Catch-all routes in Reflex allow you to match any number of segments in a URL dynamically.

Example:

In this case, the ...splat catch-all pattern captures any number of segments after /users/, allowing URLs like /users/2/posts/john/ and /users/1/posts/john/doe/ to match the route.

Catch-all routes must be named splat and be placed at the end of the URL pattern to ensure proper route matching.

Route PatternExample URlvalid
/users/posts/users/postsvalid
/products/[category]/products/electronicsvalid
/users/[username]/posts/[id]/users/john/posts/5valid
/users/[[...splat]]/posts/users/john/postsinvalid
/users/john/doe/postsinvalid
/users/[[...splat]]/users/john/valid
/users/john/doevalid
/products/[category]/[[...splat]]/products/electronics/laptopsvalid
/products/electronics/laptops/lenovovalid
/products/[category]/[[...splat]]/products/electronicsvalid
/products/electronics/laptopsvalid
/products/electronics/laptops/lenovovalid
/products/electronics/laptops/lenovo/thinkpadvalid
/products/[category]/[[...splat]]/[[...splat]]/products/electronics/laptopsinvalid
/products/electronics/laptops/lenovoinvalid
/products/electronics/laptops/lenovo/thinkpadinvalid

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