Book Image

jQuery 1.4 Reference Guide

By : Jonathan Chaffer, Karl Swedberg, jQuery Foundation
Book Image

jQuery 1.4 Reference Guide

By: Jonathan Chaffer, Karl Swedberg, jQuery Foundation

Overview of this book

If you are looking for a comprehensive reference guide to this popular JavaScript library, this book and eBook is for you. To make optimal use of jQuery, it's good to keep in mind the breadth of capabilities it provides. You can add dynamic, interactive elements to your sites with reduced development time using jQuery.Revised and updated for version 1.4 of jQuery, this book offers an organized menu of every jQuery method, function, and selector. Each method and function is introduced with a summary of its syntax and a list of its parameters and return value, followed by a discussion, with examples where applicable, to assist in getting the most out of jQuery and avoiding the pitfalls commonly associated with JavaScript and other client-side languages.In this book you will be provided information about the latest features of jQuery that include Sizzle Selector, Native event delegation, Event triggering, DOM manipulation, and many more. You won't be confined to built-in functionality, you'll be able to examine jQuery's plug-in architecture and we discuss both how to use plug-ins and how to write your own. If you're already familiar with JavaScript programming, this book will help you dive right into advanced jQuery concepts. You'll be able to experiment on your own, trusting the pages of this book to provide information on the intricacies of the library, where and when you need it.This book is a companion to Learning jQuery 1.3. Learning jQuery 1.3 begins with a tutorial to jQuery, where the authors share their knowledge, experience, and enthusiasm about jQuery to help you get the most from the library and to make your web applications shine.jQuery 1.4 Reference Guide digs deeper into the library, taking you through the syntax specifications and following up with detailed discussions. You'll discover the untapped possibilities that jQuery 1.4 makes available, and polish your skills as you return to this guide time and again.
Table of Contents (19 chapters)
jQuery 1.4 Reference Guide
Credits
About the Authors
About the Reviewers
Preface
Index

jQuery object properties


Each jQuery object we create contains a number of properties alongside its methods. These properties allow us to inspect various attributes of the object.

.length

Note

The number of DOM elements matched by the jQuery object.

Suppose we had a simple unordered list on the page:

<ul>
  <li>foo</li>
  <li>bar</li>
</ul>

We can determine the number of list items by examining .length.

$.print('Length: ' + $('li').length);

This will output the count of items:

Length: 2

.selector

Note

The selector string that was used to create the jQuery object.

The .live() method for binding event handlers uses this property to determine how to perform its searches. Plug-ins that perform similar tasks may also find the property useful.

This property contains a string representing the matched set of elements. However, if DOM traversal methods have been called on the object, the string may not be a valid jQuery selector expression. For example, examine the value of...