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

Event propagation


In illustrating the ability of the click event to operate on normally non-clickable page elements, we have crafted an interface that gives few hints that the style switcher label—actually just an <h3> element—is actually a live part of the page awaiting user interaction. To remedy this, we can give it a rollover state, making it clear that it interacts in some way with the mouse:

.hover {
  cursor: pointer;
  background-color: #afa;
}

The CSS specification includes a pseudo-class called :hover, which allows a stylesheet to affect an element's appearance when the user's mouse cursor hovers over it. This would certainly solve our problem in this instance, but instead, we will take this opportunity to introduce jQuery's .hover() method, which allows us to use JavaScript to change an element's styling—and indeed, perform any arbitrary action—both when the mouse cursor enters the element and when it leaves the element.

The .hover() method takes two function arguments, unlike...