angular/forms integer validator

Question

How can I validate my numeric input field to only accept integer and not any kind of decimal numbers (comma / dot)?

Code

Component

import { FormGroup, FormBuilder, Validators } from '@angular/forms';

this.savingData = this.formBuilder.group({
  amount: ['', Validators.required], // only accept integer 123000
});

HTML

<ion-input type="number" min="1" inputmode="numeric" formControlName="amount" placeholder="{{ 'SAVINGS.amount' | translate }}" ></ion-input>

Any idea?

Alyworth

Answer 1

You can try Angular Reactive form pattern validator

this.savingData = this.formBuilder.group({
  amount: ['', [Validators.required, Validators.pattern("^[0-9]*$")]], // only numbers
});

Approval

@Alyworth add regex inside quotes updated answer checkout now – Approval

ok works this way amount: ['', [Validators.required, Validators.pattern("^[0-9]*$")]], thanks a lot – Alyworth

@Alyworth It will accept other chars as well but the form would be invalid though. – Approval

If you are OK with negative numbers too: Validators.pattern('^-?[0-9]*$') – Flack

Answer 2

Try to use pattern like \d+. It is in Validators.pattern()

Jennings

You mean I replace Validators.required with Validators.pattern()? – Alyworth

You can do this, or save required and use \d* – Jennings