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form_control_name.ts
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form_control_name.ts
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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {Directive, EventEmitter, forwardRef, Host, Inject, Input, OnChanges, OnDestroy, Optional, Output, Self, SimpleChanges, SkipSelf} from '@angular/core';
import {FormControl} from '../../model';
import {NG_ASYNC_VALIDATORS, NG_VALIDATORS} from '../../validators';
import {AbstractFormGroupDirective} from '../abstract_form_group_directive';
import {ControlContainer} from '../control_container';
import {ControlValueAccessor, NG_VALUE_ACCESSOR} from '../control_value_accessor';
import {NgControl} from '../ng_control';
import {ReactiveErrors} from '../reactive_errors';
import {_ngModelWarning, controlPath, isPropertyUpdated, selectValueAccessor} from '../shared';
import {AsyncValidator, AsyncValidatorFn, Validator, ValidatorFn} from '../validators';
import {NG_MODEL_WITH_FORM_CONTROL_WARNING} from './form_control_directive';
import {FormGroupDirective} from './form_group_directive';
import {FormArrayName, FormGroupName} from './form_group_name';
export const controlNameBinding: any = {
provide: NgControl,
useExisting: forwardRef(() => FormControlName)
};
/**
* @description
* Syncs a `FormControl` in an existing `FormGroup` to a form control
* element by name.
*
* @see [Reactive Forms Guide](guide/reactive-forms)
* @see `FormControl`
* @see `AbstractControl`
*
* @usageNotes
*
* ### Register `FormControl` within a group
*
* The following example shows how to register multiple form controls within a form group
* and set their value.
*
* {@example forms/ts/simpleFormGroup/simple_form_group_example.ts region='Component'}
*
* To see `formControlName` examples with different form control types, see:
*
* * Radio buttons: `RadioControlValueAccessor`
* * Selects: `SelectControlValueAccessor`
*
* ### Use with ngModel is deprecated
*
* Support for using the `ngModel` input property and `ngModelChange` event with reactive
* form directives has been deprecated in Angular v6 and is scheduled for removal in
* a future version of Angular.
*
* For details, see [Deprecated features](guide/deprecations#ngmodel-with-reactive-forms).
*
* @ngModule ReactiveFormsModule
* @publicApi
*/
@Directive({selector: '[formControlName]', providers: [controlNameBinding]})
export class FormControlName extends NgControl implements OnChanges, OnDestroy {
private _added = false;
/**
* Internal reference to the view model value.
* @internal
*/
viewModel: any;
/**
* @description
* Tracks the `FormControl` instance bound to the directive.
*/
// TODO(issue/24571): remove '!'.
readonly control!: FormControl;
/**
* @description
* Tracks the name of the `FormControl` bound to the directive. The name corresponds
* to a key in the parent `FormGroup` or `FormArray`.
* Accepts a name as a string or a number.
* The name in the form of a string is useful for individual forms,
* while the numerical form allows for form controls to be bound
* to indices when iterating over controls in a `FormArray`.
*/
// TODO(issue/24571): remove '!'.
@Input('formControlName') name!: string|number|null;
/**
* @description
* Triggers a warning in dev mode that this input should not be used with reactive forms.
*/
@Input('disabled')
set isDisabled(isDisabled: boolean) {
if (typeof ngDevMode === 'undefined' || ngDevMode) {
ReactiveErrors.disabledAttrWarning();
}
}
// TODO(kara): remove next 4 properties once deprecation period is over
/** @deprecated as of v6 */
@Input('ngModel') model: any;
/** @deprecated as of v6 */
@Output('ngModelChange') update = new EventEmitter();
/**
* @description
* Static property used to track whether any ngModel warnings have been sent across
* all instances of FormControlName. Used to support warning config of "once".
*
* @internal
*/
static _ngModelWarningSentOnce = false;
/**
* @description
* Instance property used to track whether an ngModel warning has been sent out for this
* particular FormControlName instance. Used to support warning config of "always".
*
* @internal
*/
_ngModelWarningSent = false;
constructor(
@Optional() @Host() @SkipSelf() parent: ControlContainer,
@Optional() @Self() @Inject(NG_VALIDATORS) validators: (Validator|ValidatorFn)[],
@Optional() @Self() @Inject(NG_ASYNC_VALIDATORS) asyncValidators:
(AsyncValidator|AsyncValidatorFn)[],
@Optional() @Self() @Inject(NG_VALUE_ACCESSOR) valueAccessors: ControlValueAccessor[],
@Optional() @Inject(NG_MODEL_WITH_FORM_CONTROL_WARNING) private _ngModelWarningConfig: string|
null) {
super();
this._parent = parent;
this._setValidators(validators);
this._setAsyncValidators(asyncValidators);
this.valueAccessor = selectValueAccessor(this, valueAccessors);
}
/** @nodoc */
ngOnChanges(changes: SimpleChanges) {
if (!this._added) this._setUpControl();
if (isPropertyUpdated(changes, this.viewModel)) {
if (typeof ngDevMode === 'undefined' || ngDevMode) {
_ngModelWarning('formControlName', FormControlName, this, this._ngModelWarningConfig);
}
this.viewModel = this.model;
this.formDirective.updateModel(this, this.model);
}
}
/** @nodoc */
ngOnDestroy(): void {
if (this.formDirective) {
this.formDirective.removeControl(this);
}
}
/**
* @description
* Sets the new value for the view model and emits an `ngModelChange` event.
*
* @param newValue The new value for the view model.
*/
viewToModelUpdate(newValue: any): void {
this.viewModel = newValue;
this.update.emit(newValue);
}
/**
* @description
* Returns an array that represents the path from the top-level form to this control.
* Each index is the string name of the control on that level.
*/
get path(): string[] {
return controlPath(this.name == null ? this.name : this.name.toString(), this._parent!);
}
/**
* @description
* The top-level directive for this group if present, otherwise null.
*/
get formDirective(): any {
return this._parent ? this._parent.formDirective : null;
}
private _checkParentType(): void {
if (typeof ngDevMode === 'undefined' || ngDevMode) {
if (!(this._parent instanceof FormGroupName) &&
this._parent instanceof AbstractFormGroupDirective) {
ReactiveErrors.ngModelGroupException();
} else if (
!(this._parent instanceof FormGroupName) &&
!(this._parent instanceof FormGroupDirective) &&
!(this._parent instanceof FormArrayName)) {
ReactiveErrors.controlParentException();
}
}
}
private _setUpControl() {
this._checkParentType();
(this as {control: FormControl}).control = this.formDirective.addControl(this);
if (this.control.disabled && this.valueAccessor!.setDisabledState) {
this.valueAccessor!.setDisabledState!(true);
}
this._added = true;
}
}