A step-by-step guide to building a cascading address selector — province, district, commune — using the CambodiaPostalCode Dev API and React state.
A cascading dropdown is the classic pattern for address forms: select a province first, then districts update, then communes update based on the district.
Start by fetching the full list of provinces. Cache this client-side since it rarely changes.
When a user selects a province, fetch districts for that province and reset commune selection while loading.