Turbo Frames - Chained Selects

Premise Pick a country, then pick a city — you’ve seen this pattern a thousand times. The second dropdown depends on what you chose in the first. In jQuery-land this meant fetching JSON and manually rebuilding <option> elements. In React, you’d manage loading states, store the fetched options in component state, and re-render. With Turbo Frames, the server just re-renders the HTML you already…