CHAPTER 7
JavaScript and Form Validation
It is inevitable that, when encountering a form, one considers the fate of the data for that form. One of the first practical applications of JavaScript was providing a way to validate data on the client side, instead of having to endure a round trip to the server. Form validation was a bit ad hoc at the time, with no practical API and no real integration with the browser. Instead, programmers bound together events and basic text manipulation to provide a handy user interface enhancement.
Fast-forward to the present day, and form validation is in much better shape. With modern browsers, we have an integrated ...
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