Show It Once, Then Never Again… One-Time UI in Angular
May 29, 2025One-time UI elements like onboarding banners and tooltips need to remember their dismissed state across page reloads, but managing this with component state loses persistence. LocalStorage provides persistent storage that survives browser sessions, while Angular signals enable reactive state management. This tutorial demonstrates how to build a reusable structural directive that combines localStorage persistence with signal-based reactivity, creating a one-time UI pattern you can use anywhere in your Angular application.