JavaScript Demystified

Even if you have no programming experience, you'll learn to create dynamic, interactive Web pages with help from this easy-to-use, self-teaching guide. Author and programming instructor Jim Keogh covers the basics of this leading Web development language and explains how to write cross-browser JavaScript programs in no time.

Jim Keogh (Ridgefield Park, NJ) is on the faculty of Columbia University and Saint Peter's College in Jersey City, New Jersey. He developed the e-commerce track at Columbia University. Keogh has spent decades developing applications for major Wall Street corporations and is the author of more than 60 books, including J2EE: The Complete Reference, Java Demystified, ASP.NET Demystified, Data Structures Demystified, XML Demystified, and others in the Demystified series.

Introduction

xv

An Inside Look at JavaScript

1

(14)

Answers to Common Questions About JavaScript

2

(1)

JavaScript: A Limited-Featured Programming Language

3

(1)

Getting Down to JavaScript

4

(3)

Object Name

4

(1)

Property

5

(1)

Methods

5

(1)

The Dot Syntax

6

(1)

The Main Event

6

(1)

Writing Your First JavaScript

7

(3)

``Old Timers'' Don't Like JavaScript

10

(1)

Spicing Up Your JavaScript

11

(1)

Looking Ahead

12

(1)

Quiz

12

(3)

Variables, Operators, and Expressions

15

(28)

Values and Variables

16

(8)

Values

16

(1)

Variables

17

(7)

Operators and Expressions

24

(16)

Parts of an Expression

24

(1)

Multiple Operations

24

(1)

Types of Operators

25

(15)

Looking Ahead

40

(1)

Quiz

40

(3)

Condition Statements

43

(32)

if Statement

45

(13)

The if Statement in Action

45

(1)

The if...else Statement

46

(2)

The if...else if Statement

48

(4)

Other Variations of the if Statement

52

(1)

Nested if Statement

53

(2)

Identifying a Browser

55

(3)

switch...case Statement

58

(4)

Loop Statement

62

(10)

The for Loop

62

(4)

The for in Loop

66

(2)

The while Loop

68

(2)

The do...while Loop

70

(1)

continue

71

(1)

Looking Ahead

72

(1)

Quiz

73

(2)

Arrays

75

(20)

What Is an Array?

75

(1)

Declaring an Array

76

(2)

Initializing an Array

77

(1)

Defining Array Elements

78

(2)

How Many Elements Are in the Array?

79

(1)

Looping the Array

80

(2)

Adding an Array Element

82

(1)

Sorting Array Elements

83

(1)

Making a New Array from an Existing Array

84

(3)

Combining Array Elements into a String

87

(3)

Changing Elements of the Array

90

(1)

Looking Ahead

91

(1)

Quiz

92

(3)

Functions

95

(22)

What Is a Function?

96

(1)

Defining a Function

96

(4)

Writing a Function Definition

98

(1)

Adding Arguments

99

(1)

The Scope of Variables and Arguments

100

(1)

Calling a Function

101

(7)

Calling a Function Without an Argument

102

(1)

Calling a Function with an Argument

103

(1)

Calling a Function from HTML

104

(4)

Functions Calling Another Function

108

(1)

Returning Values from a Function

109

(4)

Looking Ahead

113

(1)

Quiz

114

(3)

Strings

117

(18)

Why Manipulate a String?

117

(1)

Joining Strings

118

(2)

Finding Your Way Around a String

120

(3)

Dividing Text

123

(6)

Copying a Substring

125

(4)

Converting Numbers and Strings

129

(2)

Numbers to Strings

130

(1)

Changing the Case of the String

131

(1)

Strings and Unicode

132

(1)

Looking Ahead

132

(1)

Quiz

133

(2)

Forms and Event Handling

135

(30)

Building Blocks of a Form

136

(1)

Elements and JavaScript

136

(1)

Responding to Form Events

137

(4)

Form Objects and Elements

141

(3)

Time-Saving Shortcut

143

(1)

Changing Attribute Values Dynamically

144

(4)

Changing Elements Based on a Value Selected by the User

146

(2)

Changing an Option List Dynamically

148

(3)

Evaluating Check Box Selections

151

(2)

Manipulating Elements Before the Form Is Submitted

153

(2)

Using Intrinsic JavaScript Functions

155

(1)

Changing Labels Dynamically

156

(3)

Disabling Elements

159

(2)

Read-Only Elements

161

(1)

Looking Ahead

162

(1)

Quiz

163

(2)

Cookies

165

(14)

Cookie Basics

166

(1)

Creating a Cookie

167

(2)

Reading a Cookie

169

(2)

Setting the Expiration Date

171

(1)

Deleting a Cookie

172

(2)

Personalizing an Experience Using a Cookie

174

(2)

Looking Ahead

176

(1)

Quiz

176

(3)

Browser Windows

179

(20)

Open the Window, Please!

180

(2)

Giving the New Window Focus

182

(2)

Placing the Window into Position on the Screen

184

(2)

Changing the Contents of a Window

186

(1)

Closing the Window

187

(3)

``Magically'' Scrolling a Web Page

190

(1)

Opening Multiple Windows at Once

191

(1)

Creating a Web Page in a New Window

192

(3)

Looking Ahead

195

(1)

Quiz

196

(3)

Regular Expressions

199

(18)

What Is a Regular Expression?

200

(1)

The Language of a Regular Expression

201

(6)

Finding Nonmatching Characters

204

(1)

Entering a Range of Characters

205

(1)

Matching Digits and Nondigits

205

(1)

Matching Punctuation and Symbols

206

(1)

Matching Words

206

(1)

Replace Text Using a Regular Expression

207

(2)

Replacing Like Values

208

(1)

Return the Matched Characters

209

(5)

The Telephone Number Match

210

(3)

Regular Expression Object Properties

213

(1)

Looking Ahead

214

(1)

Quiz

215

(2)

JavaScript and Frames

217

(14)

You've Been Framed!

218

(4)

Invisible Borders

220

(2)

Calling a Child Window's JavaScript Function

222

(1)

Changing the Content of a Child Window

223

(3)

Changing the Focus of a Child Window

226

(1)

Writing to a Child Window from a JavaScript

226

(2)

Accessing Elements of Another Child Window

228

(1)

Looking Ahead

228

(1)

Quiz

229

(2)

Rollovers

231

(18)

Setting the Stage

232

(2)

Creating a Rollover

234

(3)

Text Rollovers

237

(2)

Multiple Actions for a Rollover

239

(4)

More Efficient Rollovers

243

(2)

Looking Ahead

245

(1)

Quiz

245

(4)

Getting Your Message Across: The Status Bar, Banners, and Slideshows

249

(30)

Making Magic Using the Status Bar

250

(18)

Building a Static Message

250

(3)

Changing the Message Using Rollovers

253

(3)

Moving the Message Along the Status Bar

256

(12)

Banner Advertisements

268

(5)

Loading and Displaying Banner Advertisements

268

(3)

Linking Banner Advertisements to URLs

271

(2)

Creating a Slideshow

273

(2)

Looking Ahead

275

(1)

Quiz

276

(3)

Protecting Your Web Page

279

(12)

Hiding Your Code

280

(6)

Disabling the Right Mouse Button

280

(3)

Hiding Your JavaScript

283

(3)

Concealing Your E-mail Address

286

(2)

Looking Ahead

288

(1)

Quiz

288

(3)

Menus

291

(18)

Creating a Pull-Down Menu

292

(2)

Dynamically Changing a Menu

294

(2)

Validating Menu Selections

296

(2)

Creating DHTML Menus

298

(7)

Floating Menu

299

(1)

Chain Select Menu

299

(1)

Tab Menu

300

(1)

Popup Menu

300

(1)

Highlighted Menu

301

(1)

Folding Tree Menu

301

(1)

Microsoft Outlook Bar Style Menu

302

(1)

Context Menu

303

(1)

Scrollable Menu

303

(1)

Side Bar Menu

304

(1)

Slide-In Menu

304

(1)

Looking Ahead

305

(1)

Quiz

306

(3)

DHTML

309

(20)

What Is DHTML?

310

(3)

Learning DHTML

310

(1)

Cascading Style Sheets

311

(2)

Using DHTML Code

313

(14)

Generic Drag

313

(3)

LCD Clock All

316

(3)

Watermark Background Image

319

(1)

Tabbed Document Viewer Using iframe

319

(4)

Daily iframe Content

323

(2)

Cross-Browser Marquee

325

(1)

Popup Calendar

325

(1)

Drop-In Content Box

325

(1)

Ad Box

326

(1)

Quiz

327

(2)

Appendix

329

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JavaScript Demystified

Summary

Author Biography

Table of Contents

Supplemental Materials