I'd like to get some feedback on form validation. In my organization (major insurance company), it is necessary to validate the following fields:
For existing and new customers:
- first name (letters only)
- last name (letters only)
- city (only letters)
- zip (only numbers)
- email (correct format is: jsmith at hotmail.com)
- phone (only numbers)
and in some cases:
- Date of birth
The question we're struggling with is since most of these fields are very common, how much explanation is needed in the validation messages. For example, do we really need to say that a first name should only contain letters, or is it overkill? (We don't expect 50 Cent to be submitting any forms).
The site is for consumers in the U.S., so we're not concerned about letters in postal codes, etc.
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