Tutorial

Build a shared shopping list with sign-in and an HTTP test. Every open tab shows the same list. A change in 1 tab updates all of them.

You need Go, templ v0.3.1100, the datapages CLI and Docker, which Installation covers. The tutorial assumes you know Go and net/http. It introduces templ and Datastar where the code first uses them.

At the end, the app:

• shows the list in every open tab and updates each tab without a reload
• adds, checks off, renames and removes items
• keeps the rename field of 1 tab open while other tabs change the list
• lets signed-in users change the list and shows it read-only to guests
• passes a test that signs in and adds an item over HTTP

Steps

Each step changes the code of the step before it.

1. Create the project
2. Show the list
3. Add items
4. Update every open tab
5. Check off and remove items
6. Rename an item with per-tab state
7. Sign in
8. Test the app