Book Image

Learning jQuery - Fourth Edition - Fourth Edition

Book Image

Learning jQuery - Fourth Edition - Fourth Edition

Overview of this book

To build interesting, interactive sites, developers are turning to JavaScript libraries such as jQuery to automate common tasks and simplify complicated ones. Because many web developers have more experience with HTML and CSS than with JavaScript, the library's design lends itself to a quick start for designers with little programming experience. Experienced programmers will also be aided by its conceptual consistency. LearningjQuery - Fourth Edition is revised and updated version of jQuery. You will learn the basics of jQuery for adding interactions and animations to your pages. Even if previous attempts at writing JavaScript have left you baffled, this book will guide you past the pitfalls associated with AJAX, events, effects, and advanced JavaScript language features. Starting with an introduction to jQuery, you will first be shown how to write a functioning jQuery program in just three lines of code. Learn how to add impact to your actions through a set of simple visual effects and to create, copy, reassemble, and embellish content using jQuery's DOM modification methods. The book will take you through many detailed, real-world examples, and even equip you to extend the jQuery library itself with your own plug-ins.
Table of Contents (24 chapters)
Learning jQuery Fourth Edition
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Adding new global functions


Some of the built-in capabilities of jQuery are provided via what we have been calling global functions. As we've seen, these are actually methods of the jQuery object, but practically speaking, they are functions within a jQuery namespace.

A prime example of this technique is the $.ajax() function. Everything that $.ajax() does could be accomplished with a regular global function called ajax(), but this approach would leave us open for function name conflicts. By placing the function within the jQuery namespace, we only have to worry about conflicts with other jQuery methods. This jQuery namespace also signals to those who might use the plugin that the jQuery library is required.

Many of the global functions provided by the core jQuery library are utility methods; that is, they provide shortcuts for tasks that are frequently needed, but not difficult to do by hand. The array-handling functions $.each(), $.map(), and $.grep() are good examples of these. To illustrate...