Angular 4 Form Validators - minLength & maxLength does not work on field type number

Question

I am trying to develop a contact form, I want user to enter phone number values between length 10-12.

Notably same validation is working on Message

Answer 1

For a number field, you can validate min and max values using built in Angular validation, like this:

.ts

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

private myNumberFieldMin: number = 1;
private myNumberFieldMax: number = 1000000;

constructor() {
      this.myForm = this.formBuilder.group({
        myNumberField
      })

this.myForm.controls.myNumberField.setValidators([
  Validators.min(this.myNumberFieldMin),
  Validators.max(this.myNumberFieldMax)
]);

html

  

  

    Value must be at least {{myNumberFieldMin}}
  
  

    Maximum value is {{myNumberFieldMax}}