How to Build Dynamic Form Validation Using Angular Signal Forms

Angular Signal Forms allow developers to create forms that dynamically show or hide fields based on user input. A common use case is an account registration form that switches between individual and business field sets depending on the selected account type. Developers define a typed form model using signals, then use a schema to specify visibility rules that hide irrelevant sections when the account type changes. The form is created by passing both the model and schema to a form() function, which handles validation and field visibility automatically. Angular documentation recommends initializing all fields upfront, even hidden ones, to avoid data loss when users switch between options.