angular-forms

Reactive forms in Angular use FormGroup, FormBuilder, and Validators to manage form state and validation explicitly. Build a FormGroup with typed controls, attach validators like required or email, and access validation status in real time to display errors to users.

Signal forms provide automatic two-way binding and lightweight validation with less boilerplate, while reactive forms offer explicit state management with FormGroup for complex validation logic. Use signals for simple inputs and reactive forms when you need robust, testable form models.

Yes, Angular signals enable type-safe access to form controls with automatic reactivity. Signals-based form controls provide lightweight validation and two-way binding without the overhead of FormGroup, ideal for straightforward login or settings forms.

FormArray lets you manage collections of form controls dynamically in reactive forms. Use FormBuilder to create and push FormGroup instances to FormArray, then iterate over the array in your template to render and validate each form group independently.

Both reactive forms and signals support real-time validation. Reactive forms use FormControl.statusChanges or valueChanges observables to trigger updates; signals automatically propagate validation state. Choose based on your form complexity and existing architecture.

Display errors for required fields, email format, password strength, and field matching using Angular's built-in Validators. Access validation status via FormControl.errors to show specific messages like "Email is invalid" or "Passwords do not match" in real time.