allow only numeric input in angular 7

Angular 7 Directive - Allow Only Numeric in Textbox Example

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

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

@Directive({
  selector: '[OnlyNumeric]'
})
export class OnlyNumericDirective {

  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) {
      event.stopPropagation();
    }
  }
}

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

@NgModule({
  declarations: [
    OnlyNumericDirective
  ],
  imports: [
  ],
  providers: [
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Components – The Interest rate field should be only numeric input by using the directive – OnlyNumeric.
<input type="text" OnlyNumeric required [(ngModel)]="model.InterestRate" id="InterestRate" name="InterestRate" class="form-control" placeholder="Interest rate">

Result looks like –
Stayed Informed - Allow Only Numbers Input in Textbox in Angular 7
ANIL SINGH

Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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