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Hello, there!

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Sweet Angular, good forms never seem so good

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@cironunesdev

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Fill

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Fill React

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Fill React Validate

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Fill React Validate Submit

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Template-driven

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Template-driven Model-driven
 (reactive)

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Template-driven

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FormsModule

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[(ngModel)] FormsModule

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[(ngModel)] #tpl reference variables FormsModule

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import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { FormsModule } from '@angular/forms'; @NgModule({ imports: [ BrowserModule, FormsModule ] }) export class AppModule {}

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model = { name: '' };

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"#form> model = { name: '' };

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{{ model.name }} "#form> model = { name: '' };

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Invalid!"#div> "#form>

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abstractControl properties valid dirty invalid touched pending status disabled untouched enabled *statusChanges errors *valueChanges pristine path

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abstractControl properties valid dirty invalid touched pending status disabled untouched enabled *statusChanges errors *valueChanges pristine path *: Observable

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ngControlStatus CSS classes ng-valid ng-invalid ng-pending ng-pristine ng-dirty ng-untouched ng-touched

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Model-driven
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ReactiveFormsModule

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FormGroup, FormControl, FormArray, FormBuilder ReactiveFormsModule

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FormGroup, FormControl, FormArray, FormBuilder ReactiveFormsModule reactive_directives

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import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { ReactiveFormsModule } from '@angular/forms'; @NgModule({ imports: [ BrowserModule, ReactiveFormsModule ] }) export class AppModule {}

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constructor(private fb: FormBuilder) { this.heroForm = fb.group({ name: ['', [Validators.required, Validators.minLength(3)]], rival: [], superpowers: fb.group({ invisibility: false, fly: false, nightVision: false, healing: false }, { validator: superpowersValidator }), sex: [], skills: fb.group({ programming: 0, bjj: 0, fifa: 0 }), github: [] }); }

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Name is required"#strong> "#span>

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Name is required"#strong> "#span>

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Name is required"#strong> "#span>

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Name is required"#strong> "#span>

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abstractControl methods #reset(value: any = undefined) #hasError(errorCode: string, path?: string[]): boolean #getError(errorCode: string, path?: string[]): any

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this.name = (this.heroForm.get('name') as FormControl);

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this.name = (this.heroForm.get('name') as FormControl); *ngIf="name.touched "& name.hasError('required')"

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constructor(private fb: FormBuilder) { this.heroForm = fb.group({ name: ['', [Validators.required, Validators.minLength(3)]], rival: [], superpowers: fb.group({ invisibility: false, fly: false, nightVision: false, healing: false }, { validator: superpowersValidator }), sex: [], skills: fb.group({ programming: 0, bjj: 0, fifa: 0 }), github: [] }); }

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constructor(private fb: FormBuilder) { this.heroForm = fb.group({ name: ['', [Validators.required, Validators.minLength(3)]], rival: [], superpowers: fb.group({ invisibility: false, fly: false, nightVision: false, healing: false }, { validator: superpowersValidator }), sex: [], skills: fb.group({ programming: 0, bjj: 0, fifa: 0 }), github: [] }); }

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export const superpowersValidator = (control: AbstractControl) "' { const invisibility = control.get('invisibility'); const fly = control.get('fly'); const healing = control.get('healing'); const nightVision = control.get('nightVision'); const fields = [invisibility, fly, healing, nightVision] .filter(field "' field.value ""( true); if (fields.length < 2) { return { atleasttwo: true }; } return null; };

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export const superpowersValidator = (control: AbstractControl) "' { const invisibility = control.get('invisibility'); const fly = control.get('fly'); const healing = control.get('healing'); const nightVision = control.get('nightVision'); const fields = [invisibility, fly, healing, nightVision] .filter(field "' field.value ""( true); if (fields.length < 2) { return { atleasttwo: true }; } return null; };

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export const superpowersValidator = (control: AbstractControl) "' { const invisibility = control.get('invisibility'); const fly = control.get('fly'); const healing = control.get('healing'); const nightVision = control.get('nightVision'); const fields = [invisibility, fly, healing, nightVision] .filter(field "' field.value ""( true); if (fields.length < 2) { return { atleasttwo: true }; } return null; };

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export const superpowersValidator = (control: AbstractControl) "' { const invisibility = control.get('invisibility'); const fly = control.get('fly'); const healing = control.get('healing'); const nightVision = control.get('nightVision'); const fields = [invisibility, fly, healing, nightVision] .filter(field "' field.value ""( true); if (fields.length < 2) { return { atleasttwo: true }; } return null; };

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Custom controls

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@Component({ selector: '…', templateUrl: '…', providers: [ { provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() "' DistributorComponent), multi: true } ] }) export class DistributorComponent implements ControlValueAccessor {}

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@Component({ selector: '…', templateUrl: '…', providers: [ { provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() "' DistributorComponent), multi: true } ] }) export class DistributorComponent implements ControlValueAccessor {}

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points: number; writeValue(value: number): void { if (value "") undefined) { this.points = value; } } registerOnChange(fn: any): void { this.propagateChange = fn; } propagateChange = (_: any) "' {}; registerOnTouched(fn: any): void {} setDisabledState?(isDisabled: boolean): void {}

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increment() { this.points += 1; this.propagateChange(this.points); this.update.emit(this.groupPoints - 1); } decrement() { this.points -= 1; this.propagateChange(this.points); this.update.emit(this.groupPoints + 1); }

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increment() { this.points += 1; this.propagateChange(this.points); this.update.emit(this.groupPoints - 1); } decrement() { this.points -= 1; this.propagateChange(this.points); this.update.emit(this.groupPoints + 1); }

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Template-driven

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"#app-distributor>

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updatePoints(points: number): void { this.points = points; }

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Model-driven
 (reactive)

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"#app-distributor>

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this.skills$ = this.skills .valueChanges .subscribe(skills "' { let sum = ""*; this.points = 10 - sum; });

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this.skills$ = this.skills .valueChanges .subscribe(skills "' { let sum = ""*; this.points = 10 - sum; }); this.skills$.unsubscribe();

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Not covered

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Not covered Validators for custom controls

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Async validators Not covered Validators for custom controls

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Async validators Dynamic forms Not covered Validators for custom controls

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T akeaways

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T akeaways Pick up the one that works best for each situation

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T akeaways Pick up the one that works best for each situation Reuse controls

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T akeaways Pick up the one that works best for each situation Reuse controls Embrace Observables

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github.com/cironunes/good-forms

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Thanks! @cironunesdev