Angular 2: Apply Validator.required validation on some condition

Question

I have a angular 2 form wherein I have to make a field required on some condition like:

description:  [\'\', Validators.required]

This desc

Answer 1

You should set the validator on the field imperatively vs declaratively.

Declaratively (your current code):

const description = new FormControl('', Validators.required);

Imperatively:

const description = new FormControl('');
if (someCondition) {
  description.setValidators(Validators.required);
}