1176 Part V . Putting JavaScript (Web design) to Work
Friday, October 26th, 20071176 Part V . Putting JavaScript to Work The application scenario for the form is the entry of data into a company s con tractor database. Some fields are required, and the date field must be cross-con firmed with a second entry of the same data. If the form passes its final validation prior to submission, the form reloads and you see a readout of the form data that would have been submitted from the previous form had the ACTION been set to a server CGI program URI. Plan for Data Validation I devoted this entire chapter to the subject of data validation because it represents the one area of error checking that almost all JavaScript authors should be concerned with. If your scripts (client-side or server-side) perform processing on user entries, you want to prevent script errors at all costs. …
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