Chapter 7. Validating Forms
IN THIS CHAPTER
Providing Information
Validating User Data
Validating Credit Card Numbers
A common use of JavaScript is validating forms, which means using JavaScript to make sure that the user supplied the information in the form that you need. We're going to look at this in two sections: making sure the user provided certain bits of information and making sure that the information the user provided is in the appropriate form. There are also some advanced techniques in Chapter 17, “Regular Expressions.”
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