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Alex Rivera
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Suppose we're building an address book application (contrived example) with AngularJS. We have a form for contacts that has inputs for email and phone number, and we want to require one or the other , but not both : We only want the email input to be required if the phone input is empty or invalid, and vice versa. Angular has a required directive, but it's not clear from the documentation how to use it in this case. So how can we conditionally require a form field? Write a custom directive?
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