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import {Directive, ElementRef, HostListener} from '@angular/core';
@Directive({
selector: '[appNumbersOnly]'
})
export class NumbersOnlyDirective {
constructor(private _el: ElementRef) { }
@HostListener('input', ['$event']) onInputChange(event) {
const initialValue = this._el.nativeElement.value;
this._el.nativeElement.value = initialValue.replace(/[^0-9]*/g, '');
if ( initialValue !== this._el.nativeElement.value) {
event.stopPropagation();
}
}
}
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