59 lines
1.9 KiB
TypeScript
59 lines
1.9 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 {Directive, ElementRef, Renderer, forwardRef} from '@angular/core';
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import {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';
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export const NUMBER_VALUE_ACCESSOR: any = {
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provide: NG_VALUE_ACCESSOR,
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useExisting: forwardRef(() => NumberValueAccessor),
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multi: true
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};
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/**
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* The accessor for writing a number value and listening to changes that is used by the
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* {@link NgModel}, {@link FormControlDirective}, and {@link FormControlName} directives.
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*
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* ### Example
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* ```
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* <input type="number" [(ngModel)]="age">
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* ```
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*/
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@Directive({
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selector:
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'input[type=number][formControlName],input[type=number][formControl],input[type=number][ngModel]',
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host: {
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'(change)': 'onChange($event.target.value)',
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'(input)': 'onChange($event.target.value)',
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'(blur)': 'onTouched()'
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},
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providers: [NUMBER_VALUE_ACCESSOR]
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})
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export class NumberValueAccessor implements ControlValueAccessor {
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onChange = (_: any) => {};
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onTouched = () => {};
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constructor(private _renderer: Renderer, private _elementRef: ElementRef) {}
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writeValue(value: number): void {
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// The value needs to be normalized for IE9, otherwise it is set to 'null' when null
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const normalizedValue = value == null ? '' : value;
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this._renderer.setElementProperty(this._elementRef.nativeElement, 'value', normalizedValue);
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}
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registerOnChange(fn: (_: number|null) => void): void {
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this.onChange = (value) => { fn(value == '' ? null : parseFloat(value)); };
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}
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registerOnTouched(fn: () => void): void { this.onTouched = fn; }
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setDisabledState(isDisabled: boolean): void {
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this._renderer.setElementProperty(this._elementRef.nativeElement, 'disabled', isDisabled);
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}
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}
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