Disable Input fields in reactive form

Question

I already tried to follow the example of other answers from here and I did not succeed!

I created a reactive form (ie, dynamic) and I want to disable some fields at

Answer 1

If to use disabled form input elements (like suggested in correct answer how to disable input) validation for them will be also disabled, take attention for that!

(And if you are using on submit button like [disabled]="!form.valid"it will exclude your field from validation)