How to Allow Only Numbers in Textbox in Angular?

This article will provide example of allow only numbers in textbox angular. We will use angular validation for number only. This article goes in detailed on textbox should accept only numbers in angular. you will learn allow user to enter only numbers in textbox using angular.

You can use number validation pattern in angular 6, angular 7, angular 8, angular 9, angular 10, angular 11, angular 12, angular 13, angular 14, angular 15, angular 16 and angular 17 application.

I will give you full example of how to implement validation for enter number only in angular application. textbox should accept only numbers in angular using reactive form. you can also see bellow preview for validation.

Solution:

this.form = fb.group({
  number: ['', [Validators.required, Validators.pattern("^[0-9]*$")]]
})

Example:

src/app/app.component.html

<div class="container">
    <h1>Angular Validation for Number Only - ItSolutionStuff.com</h1>
        
    <form [formGroup]="form" (ngSubmit)="submit()">
            
        <div class="form-group">
            <label for="number">Number</label>
            <input 
                formControlName="number"
                id="number" 
                type="text" 
                class="form-control">
            <div *ngIf="f.number.touched && f.number.invalid" class="alert alert-danger">
                <div *ngIf="f.number.errors.required">Number is required.</div>
                <div *ngIf="f.number.errors.pattern">Enter only number.</div>
            </div>
        </div>
        
        <button class="btn btn-primary" type="submit" [disabled]="!form.valid">Submit</button>
    </form>
</div>

src/app/app.component.ts

import { Component } from '@angular/core';
import { FormBuilder, FormGroup, FormControl, Validators} from '@angular/forms';
    
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  form: FormGroup = new FormGroup({});
  
  constructor(private fb: FormBuilder) {
    this.form = fb.group({
      number: ['', [Validators.required, Validators.pattern("^[0-9]*$")]]
    })
  }
    
  get f(){
    return this.form.controls;
  }
    
  submit(){
    console.log(this.form.value);
  }
   
}

I hope it can help you...