There are as many ways to implement form validation as there are opinions of the best way to do it. This article discusses client-side validation using jQuery’s validation plugin.
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This article discusses how to use JavaScript to validate important types of form data, including names, addresses, URLs, email addresses, phone numbers, zip codes, expiration dates and credit card numbers (Visa, Master Card, Discover, and American Express, in both Canadian and US formats). By Joseph Myers. 1002
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