If you’re developing an Angular application, you might face a situation where you have to add or remove some validators dynamically in form controls. For example, let’s suppose you have a County field in your reactive form and you want to make it required based on the country selected by the user. For this, you might think of adding and removing the Required validator from the County field based on the country selected.

Well, for this kind of scenario, Angular helps us a lot. We have some built-in functions in Angular which we can use to set validators conditionally — and thanks to reactive forms, which allows us to do so very, very easily.

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Dynamically Add/Remove Validators in Angular Reactive Forms
23.10 GEEK