Selectors—How to Get Anything You Want | Learning jQuery : Better Interaction Design and Web Development with Simple JavaScript Techniques

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Learning jQuery : Better Interaction Design and Web Development with Simple JavaScript Techniques

Learning jQuery : Better Interaction Design and Web Development with Simple JavaScript Techniques

Overview of this book

jQuery is a powerful JavaScript library that can enhance your websites regardless of your background. In this book, creators of the popular jQuery learning resource, www.LearningjQuery.com, share their knowledge, experience, and enthusiasm about jQuery to help you get the most from the library and to make your web applications shine. For designers, jQuery leverages existing CSS and HTML skills, allowing you to dynamically find and change any aspect of a page.This book provides a gentle introduction to jQuery concepts, allowing you to add interactions and animations to your pages - even if previous attempts at writing JavaScript have left you baffled. For programmers, jQuery offers an open -source, standards-compliant, unobtrusive approach to writing complex JavaScript applications. This book will guide you past the pitfalls associated with AJAX, events, effects, and advanced JavaScript language features. Stop scratching your head, and start improving your web applications with jQuery and JavaScript!

Learning jQuery

Learning jQuery

Credits

Credits

About the Authors

About the Authors

About the Reviewers

About the Reviewers

Preface

Preface

Free Chapter

Getting Started

Getting Started

What jQuery Does

Why jQuery Works Well

Our First jQuery Document

Summary

Selectors—How to Get Anything You Want

Selectors—How to Get Anything You Want

The Document Object Model

The $() Factory Function

CSS Selectors

XPath Selectors

Custom Selectors

DOM Traversal Methods

Accessing DOM Elements

Summary

Events—How to Pull the Trigger

Events—How to Pull the Trigger

Performing Tasks on Page Load

Simple Events

Compound Events

Limiting and Ending Events

Simulating User Interaction

Summary

Effects—How to Add Flair to Your Actions

Effects—How to Add Flair to Your Actions

Inline CSS Modification

Basic Hide and Show

Effects and Speed

Multiple Effects

Simultaneous versus Queued Effects

In a Nutshell

Summary

DOM Manipulation—How to Change Your Page on Command

DOM Manipulation—How to Change Your Page on Command

Manipulating Attributes

Inserting New Elements

Moving Elements

Wrapping Elements

Copying Elements

DOM Manipulation Methods in a Nutshell

Summary

AJAX—How to Make Your Site Buzzword-Compliant

AJAX—How to Make Your Site Buzzword-Compliant

Loading Data on Demand

Choosing a Data Format

Passing Data to the Server

Keeping an Eye on the Request

AJAX and Events

Security Limitations

Summary

Table Manipulation

Table Manipulation

Sorting

Pagination

The Finished Code

Advanced Row Striping

Row Highlighting

Tooltips

Collapsing and Expanding

Filtering

The Finished Code

Summary

Forms with Function

Forms with Function

Progressively Enhanced Form Styling

Form Validation

Checkbox Manipulation

The Finished Code

Placeholder Text for Fields

AJAX Auto-Completion

The Finished Code

Input Masking

Numeric Calculations

Deleting Items

Editing Shipping Information

The Finished Code

Summary

Shufflers and Rotators

Shufflers and Rotators

Headline Rotator

An Image Carousel

Image Enlargement

The Finished Code

Summary

Plug-ins

Plug-ins

How to Use a Plug-in

Popular Plug-Ins

Finding Plug-in Documentation

Developing a Plug-in

Summary

Online Resources

Online Resources

jQuery Documentation

JavaScript Reference

JavaScript Code Compressors

(X)HTML Reference

CSS Reference

XPath Reference

Useful Blogs

Web Development Frameworks Using jQuery

Development Tools

Development Tools

Tools for Firefox

Tools for Internet Explorer

Tools for Safari

Other Tools

JavaScript Closures

JavaScript Closures

Inner Functions

The Great Escape

Variable Scoping

Interactions between Closures

Closures in jQuery

Memory Leak Hazards

Conclusion

Custom Selectors

To the wide variety of CSS and XPath selectors, jQuery adds its own custom selectors. Most of the custom selectors allow us to pick certain elements out of a line-up, so to speak. The syntax is the same as the CSS pseudo-class syntax, where the selector starts with a colon (:). For example, if we wanted to select the second item from a matched set of divs with a class of horizontal, we would write it like this:

$('div.horizontal:eq(1)')

Note that the eq(1) gets the second item from the set because JavaScript array numbering is zero-based, meaning that it starts with 0. In contrast, CSS is one-based, so a CSS selector such as $('div:nth-child(1)') gets any div that is the first child of its parent.

Styling Alternate Rows

Two very useful custom selectors in the jQuery library are :odd and :even. Let’s take a look at how we can use these selectors for basic table striping, given the following table:

<table>
<tr>
  <td>As You Like It</td>
  <td>Comedy...

CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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Learning jQuery : Better Interaction Design and Web Development with Simple JavaScript Techniques

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