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Web Coding & Development All-in-One For Dummies, 2nd Edition
book

Web Coding & Development All-in-One For Dummies, 2nd Edition

by Paul McFedries
January 2024
Beginner content levelBeginner
848 pages
18h 2m
English
For Dummies
Content preview from Web Coding & Development All-in-One For Dummies, 2nd Edition

Chapter 3

Validating Form Data

IN THIS CHAPTER

Bullet Validating data in the browser and on the server

Bullet Making a field mandatory

Bullet Setting restrictions on form fields

Bullet Practicing good data hygiene

Garbage in, garbage out. Or rather more felicitously: The tree of nonsense is watered with error, and from its branches swing the pumpkins of disaster.

— NICK HARKAWAY

In the old computing axiom of garbage in, garbage out (GIGO), or if in your genes or heart you’re British, rubbish in, rubbish out (yes, RIRO), lies a cautionary tale. If the data that goes into a system is inaccurate, incomplete, incompatible, or in some other way invalid, the information that comes out of that system will be outdated, outlandish, outrageous, or just outright wrong. What does this have to do with you as a web developer? Plenty, because it’s your job to make sure that the data the user enters into a form is accurate, complete, and compatible with your system.

In a word, you have to make sure the data is valid. If that sounds like a lot of work, I have some happy news for you: HTML has data validation baked in, so you ...

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Publisher Resources

ISBN: 9781394197026Purchase Link