allow only numbers

Angular 7 Directive - Allow Only Numbers Input in TextBox Example

How to restrict alphabets and special characters input in textbox Angular 7?
I am sharing an example for allowing only numbers in Textbox Angular 7, following steps involved:-
1.      Create Angular directive to allow only numbers input
2.      Import this directive in module
3.      Use the above-created directive in your components to apply this

Let’s see the example –
Create Directive to allow only numbers input –
import { Directive, ElementRef, HostListener, Input } from '@angular/core';
import { NgControl } from '@angular/forms';

  selector: '[numbersOnly]'
export class OnlynumberDirective {

  constructor(private _el: ElementRef) { }

  @HostListener('input', ['$event']) onInputChange(event) {
    const initalValue = this._el.nativeElement.value;

    this._el.nativeElement.value = initalValue.replace(/[^0-9]*/g, '');
    if ( initalValue !== this._el.nativeElement.value) {

Import directive in NgModule
import { OnlynumberDirective } from '../app/directive/onlynumber.directive';
import { OnlyNumericDirective } from './directive/only-numeric.directive';

  declarations: [
  imports: [
  providers: [
  bootstrap: [AppComponent]
export class AppModule { }

Components – The Amount field should be only number input by using the directive - numbersOnly

<input type="text" numbersOnly required  [(ngModel)]="model.Amount" id="Amount" name="Amount" class="form-control" placeholder="Amount">

Stayed Informed - Allow Only Numeric Input in Textbox in Angular 7

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