Angular Forms

When to Use What

| Use Case | Recommendation | |----------|----------------| | New apps with signals | Signal Forms (experimental) | | Production apps | Reactive Forms | | Simple forms | Template-driven |

---

Signal Forms (v21+, experimental)

import { form, FormField, required, email } from '@angular/forms/signals';

@Component({
  imports: [FormField],
  template: `
    
      
      
      Login
    
  `
})
export class LoginComponent {
  readonly loginForm = form({
    email: ['', [required, email]],
    password: ['', required]
  });
  
  readonly emailField = this.loginForm.controls.email;
  readonly passwordField = this.loginForm.controls.password;
  
  submit() {
    if (this.loginForm.valid()) {
      const values = this.loginForm.value();
    }
  }
}

Signal Forms Benefits

• Automatic two-way binding
• Type-safe field access
• Schema-based validation
• Built on signals

---

Reactive Forms (production)

import { FormBuilder, Validators, ReactiveFormsModule } from '@angular/forms';

@Component({
  imports: [ReactiveFormsModule],
  template: `
    
      
      
      Login
    
  `
})
export class LoginComponent {
  private readonly fb = inject(FormBuilder);

  form = this.fb.nonNullable.group({
    email: ['', [Validators.required, Validators.email]],
    password: ['', [Validators.required, Validators.minLength(8)]],
  });
  
  submit() {
    if (this.form.valid) {
      const { email, password } = this.form.getRawValue();
    }
  }
}

Key Points

• ALWAYS use fb.nonNullable.group() for type safety
• Use getRawValue() to get typed values
• Reactive Forms are synchronous (easier to test)

---

Nested Forms & FormArray

form = this.fb.nonNullable.group({
  name: [''],
  address: this.fb.group({
    street: [''],
    city: [''],
  }),
  phones: this.fb.array([this.fb.control('')]),
});

get phones() {
  return this.form.get('phones') as FormArray;
}

addPhone() {
  this.phones.push(this.fb.control(''));
}

---

Resources

• https://angular.dev/guide/forms/signals/overview
• https://angular.dev/guide/forms/reactive-forms

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Gentleman-Programming
• Source: Gentleman-Programming/Gentleman-Skills
• License: MIT

Install and usage instructions live in the source repository linked above.