JavaScript and Ajax for the Web: Visual QuickStart Guide, Seventh Edition

Putting Form Validation into Action

One interesting thing about the script that we built up in the last few examples is that it is largely independent of the HTML page that we used with it. In other words, you can substitute an entirely different page, with a completely different form, and you need to only make minor changes to the script to have it do all the validation tasks you want.

For example, take a look at Figure 7.8, which is a simplistic version of a form that could be used to customize a car that you want to purchase. The form includes a variety of options and interface elements, including radio buttons, menus, check boxes, and text fields that need validation for correct data entry. You’ll find the HTML for this form in Script 7.10 ...