How would you implement asynchronous validation for checking if an email is already registered?

  • Use the 'asyncValidator' property of the FormControl to call an asynchronous API.
  • Implement a synchronous validator function that checks email registration status.
  • Utilize Angular's built-in 'EmailValidator' for asynchronous checks.
  • Create a custom directive to handle email registration validation asynchronously.
To implement asynchronous validation for checking if an email is already registered, you should use the 'asyncValidator' property of the FormControl to call an asynchronous API or service. This allows you to perform an asynchronous check on the email's registration status. Options 2, 3, and 4 do not provide the correct approach for asynchronous validation.
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