What it does
Creates an AbstractControl
from a user-specified configuration.
It is essentially syntactic sugar that shortens the new FormGroup()
, new FormControl()
, and new FormArray()
boilerplate that can build up in larger forms.
How to use
To use, inject FormBuilder
into your component class. You can then call its methods directly.
import {Component, Inject} from '@angular/core'; import {FormBuilder, FormGroup, Validators} from '@angular/forms'; @Component({ selector: 'example-app', template: ` <form [formGroup]="form"> <div formGroupName="name"> <input formControlName="first" placeholder="First"> <input formControlName="last" placeholder="Last"> </div> <input formControlName="email" placeholder="Email"> <button>Submit</button> </form> <p>Value: {{ form.value | json }}</p> <p>Validation status: {{ form.status }}</p> ` }) export class FormBuilderComp { form: FormGroup; constructor(@Inject(FormBuilder) fb: FormBuilder) { this.form = fb.group({ name: fb.group({ first: ['Nancy', Validators.minLength(2)], last: 'Drew', }), email: '', }); } }
-
npm package:
@angular/forms
-
NgModule:
ReactiveFormsModule
Class Overview
class FormBuilder { group(controlsConfig: {[key: string]: any}, extra?: {[key: string]: any}) : FormGroup control(formState: Object, validator?: ValidatorFn|ValidatorFn[], asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]) : FormControl array(controlsConfig: any[], validator?: ValidatorFn, asyncValidator?: AsyncValidatorFn) : FormArray }
Class Description
Annotations
@Injectable()
Class Details
group(controlsConfig: {[key: string]: any}, extra?: {[key: string]: any}) : FormGroup
Construct a new FormGroup
with the given map of configuration. Valid keys for the extra
parameter map are validator
and asyncValidator
.
See the FormGroup
constructor for more details.
control(formState: Object, validator?: ValidatorFn|ValidatorFn[], asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]) : FormControl
Construct a new FormControl
with the given formState
,validator
, and asyncValidator
.
formState
can either be a standalone value for the form control or an object that contains both a value and a disabled status.
array(controlsConfig: any[], validator?: ValidatorFn, asyncValidator?: AsyncValidatorFn) : FormArray
Construct a FormArray
from the given controlsConfig
array of configuration, with the given optional validator
and asyncValidator
.
exported from @angular/forms/index, defined in @angular/forms/src/form_builder.ts
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