Created
May 15, 2024 23:29
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Pipe for type only numbers on inputs text
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| import { | |
| Directive, | |
| ElementRef, | |
| forwardRef, | |
| HostListener, | |
| Renderer2, | |
| } from '@angular/core'; | |
| import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms'; | |
| @Directive({ | |
| selector: '[onlyNumber]', | |
| standalone: true, | |
| providers: [ | |
| { | |
| provide: NG_VALUE_ACCESSOR, | |
| useExisting: forwardRef(() => OnlyNumberDirective), | |
| multi: true, | |
| }, | |
| ], | |
| }) | |
| export class OnlyNumberDirective implements ControlValueAccessor { | |
| private onChange: (val: string) => void; | |
| private onTouched: () => void; | |
| private value: string; | |
| constructor(private elementRef: ElementRef, private renderer: Renderer2) {} | |
| @HostListener('input', ['$event.target.value']) | |
| onInputChange(value: string) { | |
| const filteredValue: string = filterValue(value); | |
| this.updateTextInput(filteredValue, this.value !== filteredValue); | |
| } | |
| @HostListener('blur') | |
| onBlur() { | |
| this.onTouched(); | |
| } | |
| private updateTextInput(value: string, propagateChange: boolean) { | |
| this.renderer.setProperty(this.elementRef.nativeElement, 'value', value); | |
| if (propagateChange) { | |
| this.onChange(value); | |
| } | |
| this.value = value; | |
| } | |
| // ControlValueAccessor Interface | |
| registerOnChange(fn: any): void { | |
| this.onChange = fn; | |
| } | |
| registerOnTouched(fn: any): void { | |
| this.onTouched = fn; | |
| } | |
| setDisabledState(isDisabled: boolean): void { | |
| this.renderer.setProperty( | |
| this.elementRef.nativeElement, | |
| 'disabled', | |
| isDisabled | |
| ); | |
| } | |
| writeValue(value: any): void { | |
| value = value ? String(value) : ''; | |
| this.updateTextInput(value, false); | |
| } | |
| } | |
| function filterValue(value: any): string { | |
| return value.replace(/[^0-9]*/g, ''); | |
| } |
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