Prentice Hall JavaScript by Example 2nd (2011).pdf

JavaScript by Example

Second Edition

JavaScript by Example

Second Edition

Ellie Quigley

PRENTICE

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Library of Congress

Cataloging-in-Publication

Data

Quigley, Ellie.

JavaScript by example / Ellie Quigley.—2nd ed.

p. cm.

Includes index.

ISBN 978-0-13-705489-3 (pbk. : alk. paper)

1. JavaScript (Computer program language) I. Title.

QA76.73.J39Q54 2010

005.133—dc22

2010020402

protected by copyright, and permission must be obtained from the publisher prior to

any prohibited reproduction, storage in a retrieval system, or transmission in any form

or by any means, electronic, mechanical, photocopying, recording, or likewise. For

information regarding permissions, write to:

Pearson Education, Inc.

Rights and Contracts Department

501 Boylston Street, Suite 900

Boston, MA 02116

Fax: (617) 671-3447

ISBN-13: 978-0-13-705489-3

ISBN-10: 0-13-705489-0

Text printed in the United States on recycled paper at Edwards Brothers in Ann Arbor,

Michigan.

First printing, October 2010

Contents

Preface xv

Introduction to JavaScript

1.1 What JavaScript Is 1

1.2 What JavaScript Is Not 2

1.3 What JavaScript Is Used For 3

1.4 JavaScript and Its Place in a Web Page

1.4.1

Analysis of the Diagram

1.5 What Is Ajax? 5

1.6 What JavaScript Looks Like 7

1.7 JavaScript and Its Role in Web Development

1.7.1

The Three Layers

1.8 JavaScript and Events

1.9

Standardizing JavaScript and the W3C

1.9.1

JavaScript Objects

1.9.2

The Document Object Model

1.10 What Browser? 15

1.10.1 Versions of JavaScript 16

1.10.2 Does Your Browser Follow the Standard?

1.10.3 Is JavaScript Enabled on Your Browser?

1.11 Where to Put JavaScript

1.11.1

JavaScript from External Files

1.12 Validating Your Markup

1.12.1

The W3C Validation Tool

1.12.2

The Validome Validation Tool

1.13 What You Should Know

Script Setup

2.1

The HTML Document and JavaScript

2.1.1

Script Execution

2.2

Syntactical Details

2.2.1

Case Sensitivity

2.2.2

Free Form and Reserved Words

2.2.3

Statements and Semicolons

2.2.4

Comments

2.2.5

The <script> Tag

2.3

Generating HTML and Printing Output

2.3.1

Strings and String Concatenation

2.3.2

The write0 and writelnQ Methods

2.4

About Debugging

2.4.1

Types of Errors

2.5

Debugging Tools

2.5.1

Firefox

2.5.2

Debugging in Internet Explorer 8

2.5.3 The JavaScript: URL Protocol 46

2.6 JavaScript and Old or Disabled Browsers

2.6.1

Hiding JavaScript from Old Browsers

2.7

What You Should Know

3 The Building Blocks: Data Types, Literals, and Variables

3.1

Data Types

3.1.1

Primitive Data Types

3.1.2

Composite Data Types

3.2

Variables

3.2.1

Valid Names

3.2.2

Declaring and Initializing Variables

3.2.3

Dynamically or Loosely Typed Language

3.2.4

Scope of Variables

3.2.5

Concatenation and Variables

3.3

Constants

3.4

Bugs to Watch For

3.5

What You Should Know

Dialog Boxes

4.1

Interacting with the User

4.1.1

The alertO Method

4.1.2

The prompt () Method

4.1.3

The confirm() Method

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