checkbox_value_accessor.ts
/**
* @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, ElementRef, forwardRef, Renderer2} from '@angular/core';
import {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';
export const CHECKBOX_VALUE_ACCESSOR: any = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => CheckboxControlValueAccessor),
multi: true,
};
/**
* @description
* A `ControlValueAccessor` for writing a value and listening to changes on a checkbox input
* element.
*
* @usageNotes
*
* ### Using a checkbox with a reactive form.
*
* The following example shows how to use a checkbox with a reactive form.
*
* ```ts
* const rememberLoginControl = new FormControl();
* ```
*
* ```
* <input type="checkbox" [formControl]="rememberLoginControl">
* ```
*
* @ngModule ReactiveFormsModule
* @ngModule FormsModule
* @publicApi
*/
@Directive({
selector:
'input[type=checkbox][formControlName],input[type=checkbox][formControl],input[type=checkbox][ngModel]',
host: {'(change)': 'onChange($event.target.checked)', '(blur)': 'onTouched()'},
providers: [CHECKBOX_VALUE_ACCESSOR]
})
export class CheckboxControlValueAccessor implements ControlValueAccessor {
/**
* The registered callback function called when a change event occurs on the input element.
* @nodoc
*/
onChange = (_: any) => {};
/**
* The registered callback function called when a blur event occurs on the input element.
* @nodoc
*/
onTouched = () => {};
constructor(private _renderer: Renderer2, private _elementRef: ElementRef) {}
/**
* Sets the "checked" property on the input element.
* @nodoc
*/
writeValue(value: any): void {
this._renderer.setProperty(this._elementRef.nativeElement, 'checked', value);
}
/**
* Registers a function called when the control value changes.
* @nodoc
*/
registerOnChange(fn: (_: any) => {}): void {
this.onChange = fn;
}
/**
* Registers a function called when the control is touched.
* @nodoc
*/
registerOnTouched(fn: () => {}): void {
this.onTouched = fn;
}
/**
* Sets the "disabled" property on the input element.
* @nodoc
*/
setDisabledState(isDisabled: boolean): void {
this._renderer.setProperty(this._elementRef.nativeElement, 'disabled', isDisabled);
}
}