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this is part 14 of angular 6 tutorial in this video well discuss how to add or remove validators dynamically at runtime in a reactive form lets understand this with an example here is what we want to do we want to include these to contact preference radio buttons email and phone if I select email as the contact preference then this phone input field is optional if I change my contact preference from email to phone then this phone input field is required this means based on the user selection that is if the contact preferences phone then add required validator function on the phone form control if the contact preference election is email then remove the required validator function from the phone form control so we have to add or remove the required validator function dynamically from this phone form control based on what the user selects for contact preference field first lets include the required HTML for this phone input element its going to be very similar to the email input elem
