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

You should not use length here, for min and max use custom validator like this,

var numberControl = new FormControl("", CustomValidators.number({min: 10000000000, max: 999999999999 }))

Angular2 min/max validators