100 lines
3.5 KiB
TypeScript
100 lines
3.5 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Injectable} from '@angular/core';
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import {AsyncValidatorFn, ValidatorFn} from './directives/validators';
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import {isPresent} from './facade/lang';
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import {AbstractControl, FormArray, FormControl, FormGroup} from './model';
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/**
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* @whatItDoes Creates an {@link AbstractControl} from a user-specified configuration.
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*
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* It is essentially syntactic sugar that shortens the `new FormGroup()`,
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* `new FormControl()`, and `new FormArray()` boilerplate that can build up in larger
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* forms.
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*
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* @howToUse
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*
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* To use, inject `FormBuilder` into your component class. You can then call its methods
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* directly.
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*
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* {@example forms/ts/formBuilder/form_builder_example.ts region='Component'}
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*
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* * **npm package**: `@angular/forms`
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*
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* * **NgModule**: {@link ReactiveFormsModule}
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*
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* @stable
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*/
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@Injectable()
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export class FormBuilder {
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/**
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* Construct a new {@link FormGroup} with the given map of configuration.
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* Valid keys for the `extra` parameter map are `validator` and `asyncValidator`.
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*
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* See the {@link FormGroup} constructor for more details.
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*/
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group(controlsConfig: {[key: string]: any}, extra: {[key: string]: any} = null): FormGroup {
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const controls = this._reduceControls(controlsConfig);
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const validator: ValidatorFn = isPresent(extra) ? extra['validator'] : null;
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const asyncValidator: AsyncValidatorFn = isPresent(extra) ? extra['asyncValidator'] : null;
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return new FormGroup(controls, validator, asyncValidator);
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}
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/**
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* Construct a new {@link FormControl} with the given `formState`,`validator`, and
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* `asyncValidator`.
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*
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* `formState` can either be a standalone value for the form control or an object
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* that contains both a value and a disabled status.
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*
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*/
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control(
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formState: Object, validator: ValidatorFn|ValidatorFn[] = null,
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asyncValidator: AsyncValidatorFn|AsyncValidatorFn[] = null): FormControl {
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return new FormControl(formState, validator, asyncValidator);
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}
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/**
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* Construct a {@link FormArray} from the given `controlsConfig` array of
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* configuration, with the given optional `validator` and `asyncValidator`.
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*/
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array(
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controlsConfig: any[], validator: ValidatorFn = null,
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asyncValidator: AsyncValidatorFn = null): FormArray {
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const controls = controlsConfig.map(c => this._createControl(c));
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return new FormArray(controls, validator, asyncValidator);
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}
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/** @internal */
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_reduceControls(controlsConfig: {[k: string]: any}): {[key: string]: AbstractControl} {
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const controls: {[key: string]: AbstractControl} = {};
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Object.keys(controlsConfig).forEach(controlName => {
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controls[controlName] = this._createControl(controlsConfig[controlName]);
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});
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return controls;
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}
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/** @internal */
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_createControl(controlConfig: any): AbstractControl {
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if (controlConfig instanceof FormControl || controlConfig instanceof FormGroup ||
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controlConfig instanceof FormArray) {
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return controlConfig;
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} else if (Array.isArray(controlConfig)) {
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const value = controlConfig[0];
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const validator: ValidatorFn = controlConfig.length > 1 ? controlConfig[1] : null;
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const asyncValidator: AsyncValidatorFn = controlConfig.length > 2 ? controlConfig[2] : null;
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return this.control(value, validator, asyncValidator);
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} else {
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return this.control(controlConfig);
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}
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}
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}
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