angular-forms
Angular forms: Signal Forms (experimental) and Reactive Forms. Trigger: When working with forms, validation, or form state in Angular.
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- Gentleman-Programming/Gentleman-Skills
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- 2026年1月16日 21:48
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ソースの指示 · 読み取り専用プレビュー- name
- angular-forms
- description
- Angular forms: Signal Forms (experimental) and Reactive Forms. Trigger: When working with forms, validation, or form state in Angular.
- metadata
- {"author":"gentleman-programming","version":"1.0"}
## 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)
```typescript
import { form, FormField, required, email } from '@angular/forms/signals';
@Component({
imports: [FormField],
template: `
<form>
<input [formField]="emailField" type="email" />
<input [formField]="passwordField" type="password" />
<button (click)="submit()">Login</button>
</form>
`
})
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)
```typescript
import { FormBuilder, Validators, ReactiveFormsModule } from '@angular/forms';
@Component({
imports: [ReactiveFormsModule],
template: `
<form [formGroup]="form" (ngSubmit)="submit()">
<input formControlName="email" type="email" />
<input formControlName="password" type="password" />
<button type="submit" [disabled]="form.invalid">Login</button>
</form>
`
})
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
```typescript
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
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