How to check on JS the phone number is entered in Input or not?

Question

JavaScript

Good afternoon.

There is an Input field for entering a phone number, in this js field there is a mask for entering a phone number.
It is necessary to understand whether the field is filled in by the user or not?

Previously, I usually checked through length for the length of the entered data, but here a mask is applied - and the console says that there are already 17 characters. How to correctly check the filling of a phone number?

Thank you.

Answer 1

First, remove all characters except numbers, only then check the length of the phone number.