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About You
Client-side scripting and DHTML are such broad and deep subjects that
virtually every reader coming to this book will have different
experience levels, expectations, and perhaps, fears. No book could
hope to anticipate every possible question from someone wishing to
use these technologies in their web pages. Therefore, this book makes
some assumptions about readers at various stages of their experience:
- You have at least rudimentary knowledge of client-side JavaScript
concepts. You know how to put scripts into a web page where
<script> tags go as well as how to link an
external .js file into the current page. You
also know what variables, strings, numbers, Booleans, arrays, and
objects areeven if you don't necessarily
remember the precise way they're used with the
JavaScript language. This book is not a tutorial, but you can learn a
lot from reading the introductions to each chapter and the
discussions following each solution. - You may be a casual scripter, who wants to put a bit of intelligence
into a web page for some project or other. You don't
use the language or object model every day, so you need a refresher
about even some simple things, such as the correct syntax for
creating an array or pre-loading images for fast image rollover
effects. - While surfing the Web, you may have encountered some scripted DHTML
effect that you'd like to implement or adapt for
your own pages, but either you can't decipher the
code you see or you want to "roll your
own" version to avoid copyright problems with the
code's original owner. If the effect or technique
you've seen is fairly popular, this cookbook
probably has a recipe for it. You can use these recipes as they are
or modify them to fit your designs. There are no royalties or
copyrights to worry about, as long as you don't
offer these recipes to others as part of a collection of scripts. Of
course, if you wish to acknowledge this book in your source code
comments, that would be great! - You may be an experienced web developer who has probed gingerly, if
at all, into client-side scripting. The horror stories of yore about
browser incompatibilities have kept your focus entirely on
server-side programming. But now that so many mainstream sites are
using client-side scripting to improve the user experience, you are
ready to take another look at what is out there. - At the far end of the spectrum, you may be an experienced client-side
DHTML developer in search of new ideas and techniques. For instance,
you may have developed exclusively for the Internet Explorer browser
on the Windows platform, but you wish to gravitate toward
standards-compatible syntax for future coding.
Virtually every reader will find that some recipes in this book are
too simple and others are too complex for their experience level. I
hope the more difficult ones challenge you to learn more and improve
your skills. Even if you think you know it all, be sure to check the
discussions of the easier recipes for tips and insights that may be
new to you.
