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Learn Advanced JavaScript Programming

Author: Yehuda Shiran and Tomer Shiran


Chapter 1Introduction to JavaScript
The World Wide Web
Competition on the Web
Extending HTML
CGI Programs
Helpers, Plug-ins, Applets, and CGI
Helpers
Plug-ins
Java Applets
CGI (Common Gateway Interface)
What is JavaScript?
Who Can Benefit from JavaScript?
The History of JavaScript
JavaScript in a Browser
Client-side JavaScript
Browser Objects
What Can JavaScript Do?
Games
Banners
Form Validation
Miscellaneous
JavaScript and Java
JavaScript Resembles Java
JavaScript Differs from Java
JavaScript and Java are Complementary Languages
JavaScripts Current Status
The Future of JavaScript
Motivation Summary


Chapter 2Reading This Book
How to Learn JavaScript
Prerequisites
A Programming Refresher
How to Read This Book
The Structure of This Book
Programming Style
Reading Examples
Encouragement for Nonprogrammers
Warning for Programmers
Let the Show Begin


Chapter 3Writing Your First Script
Essential Authoring Tools
Choosing a Text Editor
Choosing a Browser
Basic JavaScript Structure
The <SCRIPT> Tag
Internal Scripts
External Scripts
Hiding the Script
Problems with Code Hiding
Alternate Content
Placing JavaScript Code
Conventions
Using the Semicolon
JavaScript is Case Sensitive
Comments
Using Quotes
Your First Script
Printing JavaScript Output
Updating a Page
Summary


Chapter 4JavaScript and HTML
Page Layout
Command Blocks
Functions
Defining and Calling a Function
Placing Scripts in Documents
Executing Deferred Scripts
Calling Deferred Code from a Script
Calling Deferred Code from Event Handlers
Calling Deferred Script from Links and Image Maps
JavaScript Entities
Summary


Chapter 5Basic Declarations and Expressions
Building a Script
Data Types in JavaScript
The Value Null
Variables
Identifiers
Naming Conventions
Variable Declaration
JavaScript Entities
Type Conversion
Mixing Strings and Numbers
Literals
Integer Literals
Decimal Integers
Octal Integers
Hexadecimal Integers
Converting from Decimal to Other Bases
Converting from a Specified Base to Decimal
Referring to Octal and Hexadecimal Integers
Floating Point Literals
Boolean Literals
String Literals
Making Statements
Multiple Statements
Nested Statements
Simple Assignment Statements
Evaluating Expressions
Testing Evaluation
Functions
Function Definition
Calling Functions
Summary


Chapter 6Object-Based Programming
Objects
Properties
Syntax
Methods
Syntax
Using the Array Notation
Object Based Versus Object Oriented
Summary


Chapter 7Utilizing JavaScript Operators
Operator Categories
Mathematical Operators
Addition
Subtraction
Multiplication
Division
Modulus
The Nonexistent Integral Division Operator
Increment
Decrement
Negation
String Operators
Bitwise Operators
Bitwise AND
Bitwise OR
Bitwise XOR
Bitwise NOT
Shift Operators
Left shift
Right shift
Zero-fill right shift
Assignment Operators
Relational Operators
Equality and Inequality
Short-Circuit Logical Operators
Logical OR
Logical AND
Logical NOT
Testing Equality for Floating Point Numbers
More Logical Operators
Conditional Operator
Comma Operator
Data Type Operator
Void Operator
Operator Precedence
Expressions
Side Effects
Summary


Chapter 8Control Structures
Dialog Boxes
Alert Boxes
Confirm Boxes
Prompt Boxes
if Statement
else Statement
Nested if-else Statements
The Nonexistent Switch Statement
Loop Statements
for Statement
while Statement
forin Statement
break Statement
continue Statement
with Statement
Summary


Chapter 9Functions and Variable Scope
Variable Scope and Storage Class
What are Functions?
Defining Functions and Calling Them
Function Parameters
Using the Argument Array
Creating Functions with Default Arguments
Returning a Value
Recursion
Tracing Values in Recursive Functions
Variables and Recursive Functions
Summary


Chapter 10JavaScript by Examplea Review
Height and Weight Calculator
The Task
The Algorithm
The Script
Analysis
convertInput()
getHeight(sex, age, height)
getWeight(sex, age, weight)
printResult(height, weight, sex, age)
Global Statements
Output
Base Converter
Task
Algorithm
The Script
Analysis
power(op1, op2)
div(op1, op2)
getDigit(val)
getValue(dig)
toBase(num, base)
toDec(num, base)
convert(num, base1, base2)
getTableAttributes()
drawTable(lastNum)
calcNum()
mainInput()
Global Statements
Output
Summary


Chapter 11Events in JavaScript
Events
Event Handlers
onLoad and onUnload
onError
Emulating Events via Methods
Calling Event Handlers Explicitly
Cancelling Events
Summary


Chapter 12Building and Extending Objects
Creating Instances
Constructor Functions
Defining Object Properties
Nested Objects
Defining Methods
Creating ObjectsAn Example
Prototype and Object Extensions
Summary


Chapter 13Arrays
What is an Array?
Some History
Creating Simple Arrays
Referring to an Arrays Elements
Creating Dense Arrays
Array Types
Array Properties
Array Methods
chop()
grep()
join()
pop()
push()
reverse()
shift()
splice()
split()
sort()
unshift()
The arguments Array
Multidimensional Arrays
Creation with a Single Constructor Function
Creation without Constructor Function
Associative Arrays
Populating an Associative Array
Splitting a String into an Associative Array
Summary


Chapter 14Time and Date in JavaScript
The Date Object
Creating a Date Instance
Parameters of the Date Constructor
Macs are one day in the future
Date Numeric Conventions
Date Method Categories
get Methods
getYear()
getMonth()
getDate()
getDay()
getHours()
getMinutes()
getSeconds()
getTimezoneOffset()
getTime()
set Methods
setYear()
setMonth()
setDate()
setHours()
setMinutes()
setSeconds()
setTime()
to Methods
toGMTString()
toLocaleString()
parse Methods
parse()
UTC()
Time-Related Methods of Other Objects
setTimeout()
clearTimeout()
Time and Date Examples
A Simple Digital Clock
Digital Date
Calendar
getTime()
leapYear(year)
getDays(month, year)
getMonthName(month)
setCal()
drawCal(firstDay, lastDate, date, monthName, year)
Random Quotes
Summary


Chapter 15JavaScript Math
Math in JavaScript
The Math Object
Constants
E
LN2
LN10
LOG2E
LOG10E
PI
SQRT1_2
SQRT2
Math Methods
Arithmetic Methods
abs()
ceil()
exp()
floor()
log()
max(), min()
pow()
random()
round()
sqrt()
Trigonometric Methods
cos()
acos()
sin()
asin()
tan()
atan()
atan2()
The Number Object
MAX_VALUE
MIN_VALUE
NaN
NEGATIVE_INFINITY
POSITIVE_INFINITY
Number Methods
Math-Related Functions
parseInt()
parseFloat()
eval()
Math Examples
Creating a Curve
General Plotting Utility
Summary


Chapter 16Handling Strings
String Indexing
Characters
Creating Strings
String Length
HTML Formatting Methods
General String Methods
charAt()
indexOf()
lastIndexOf()
substring()
escape & unescape
Number-to-String Conversion
Empty String Concatenation
String Instance Construction
The toString() Method
String-to-Number Conversion
parseInt() and parseFloat()
Checking if a Value is a Number or Not
Evaluating Text Expressions
String Handling Examples
String Enciphering
encipher()
encode(str, key)
Global Statements
Summary


Chapter 17Browser Objects
The Object Hierarchy
Creating Browser Objects
The Topmost Objects
window
document
history
location
Summary


Chapter 18Utilizing the Status Bar
The Status Bar
Writing to the Status Bar
Setting a Default Value to Status Bar
Banners
T-banner
Global Statements
stopBanner()
startBanner()
showBanner()
Event Handlers
R-banner
Global Statements
stopBanner()
startBanner()
clearState()
getRandom(max)
getString()
showBanner()
Event Handlers
N-banner
scrollBanner(seed)
Summary


Chapter 19URLs and JavaScript
A Crash Course in URLs
General URL Syntax
The URL Schemes
HyperText Transfer Protocol (HTTP)
File Transfer Protocol (FTP)
Gopher Protocol (Gopher)
Electronic Mail (Mailto)
Usenet News (News)
Host-Specific File Names (File)
JavaScript Statements (javascript)
Other Schemes
location Object
location Properties
href
hash
host
hostname
pathname
port
protocol
search
Search Utilities
location Methods
reload
replace
Another Locationdocument.location (document.URL)
Summary


Chapter 20Using the History List
What is a History List?
The history Object
History List Length
History List Entry Indexing
history Methods
back
forward
go
Security Aspects of the history Object
Summary


Chapter 21The document ObjectColors,Output, and Properties
The document Object
The title Property
Colors
bgColor
Global Statements
display(triplet)
drawCell(red, green, blue)
drawRow(red, blue)
drawTable(blue)
drawCube()
toHex(dec)
setbgColor(red, green, blue)
fade(sred, sgreen, sblue, ered, egreen, eblue, step)
Event Handlers
fgColor
alinkColor
linkColor
vlinkColor
Output Methods and Streams
write and writeln
Data Streams
Summary


Chapter 22Forms
What are HTML Forms?
JavaScript Form Reference
forms Array
Form Name
Form Object
HTML Syntax
Event Handlers
onSubmit
onReset
Methods
submit()
reset()
Properties
action
elements
encoding
method
target
Element Types
Using this with Event Handlers
Utilizing the form Property
Text Object
HTML Syntax
JavaScript Access
Event Handlers
onBlur
onChange
onFocus
onSelect
Methods
blur()
focus()
select()
Properties
defaultValue
name
value
Password Object
HTML Syntax
JavaScript Access
Event Handlers
Properties and Methods
Textarea Object
HTML Syntax
JavaScript Access
Event Handlers
Properties and Methods
Inserting new line Characters
Handling textareas By Line
Hidden Object
HTML Syntax
JavaScript Access
Event Handlers
Properties and Methods
Button Object, Submit Object, Reset Object
HTML Syntax
JavaScript Access
Event Handlers
onClick
Methods
click()
Properties
name
value
Checkbox Object
HTML Syntax
JavaScript Access
Event Handlers
onClick
Methods
click()
Properties
checked
defaultChecked
name
value
Radio Object
HTML Syntax
JavaScript Access
Event Handlers
onClick
Methods
click()
Properties
checked
defaultChecked
name
value
Select Object
HTML Syntax
JavaScript Access
Event Handlers
onBlur
onFocus
onChange
Methods
blur, focus
Properties (select object)
length
name
options
selectedIndex
Properties (options array)
defaultSelected
index
length
selected
text
value
The Option ObjectAdding Options Using the Option Constructor
FileUpload Object
HTML Syntax
JavaScript Access
Event Handlers
Methods
Properties
name
value
Summary


Chapter 23Links, Anchors, and Image Maps
Defining a Link
Defining an Anchor
Defining an Image Map (area)
links Array
anchors Array
Link and Area Event Handlers
Calling Event Handlers Explicitly
onClick
onMouseOver
onMouseOut
Link and Area Properties
Location-Equivalent Properties
target
Referring Documents
Summary


Chapter 24Implementing Cookies
Maintaining a State
Cookies
Cookies and HTTP
Setting an HTTP Cookie
Getting an HTTP Cookie
Notes and Limitations
Examples
First Transaction Sequence Example
Second Transaction Sequence Example
Cookies and JavaScript
Cookie Functions
getInput(num, monthName)
initCookie(monthName)
getSpecificReminder(num, monthName)
setSpecificReminder(num, monthName, newValue)
Outliner
item(parent, text, depth)
makeArray(length)
makeDatabase()
setStates()
setImages()
toggle(num)
setStorage()
Global Statements
Summary


Chapter 25Images and Graphics
Defining Images in HTML
Creating an Instance of Image Object
The images Array
Properties
border
complete
height
hspace
lowsrc
name
src
vspace
width
Event Handlers
onAbort
onError
onLoad
Demonstration 1: Up-to-date Digital Clock
Global Statements
setClock()
update()
stopClock()
getHour(place)
getMinute(place)
getAmpm()
getPath(url)
Demonstration 2: LED Sign
Global Statements
letterArray()
drawBlank()
setLight(state, x, y)
drawLetter(letter, startX)
drawSpace(startX)
computeIndex()
floodBoard(startX)
drawMessage(num)
startSign()
stopSign()
More Global Statements
Demonstration 3: Netris Deluxe
Global Statements
drawScreen()
computeIndex(x, y)
state(x, y)
setSquare(x, y, state)
clearActive()
checkMoveX(step)
checkMoveY()
moveX(step)
smartX(x, y, step)
moveY()
smartY(x, y)
shapeMap()
getRandom()
insertShape()
complexWarp()
checkWarp(startX, startY, endX, endY)
rotate()
flood(state)
noActive()
isLine(y)
warp(startX, startY, endX, endY)
start()
dropLines()
play()
characteristics(x, y)
fullMap()
pause()
MUSIC
Summary


Chapter 26Frames
What are Frames?
Creating Frames
Targeting Frames
Nested Frames
JavaScript and Frames
self
parent
top
frames
An Examplethe Color Center
The Frame-setting window
display(r, g, b)
makeAttribute(r, g, b)
Global Statements
select(r, g, b)
curAttribute()
bodyDefinition()
update()
save()
load()
HTML
The control Frame
display()
Event Handlers
The swatches Frame
The main Frame
Frames, Events, and Event Handlers
Using Event Handlers Within a Frame
Using Event Handlers in a Frame-Setting Document
onFocus and onBlur
Emulating Events
Targeting Multiple Frames
Summary


Chapter 27Windows
What are Windows?
Opening a Window with JavaScript
An IE 3.0x Bug Workaround
Referencing Windows
Window Names
Remotes
HTML-Based Remotes (Recommended)
JavaScript-Based Remote
Another Algorithm to Open Windows
Closing a Window
Scrolling a Window
Windows, Events, and Event Handlers
Accessing a Windows ObjectsAn Example
getNewLine()
getInput(func, form)
vertical()
Summary


Chapter 28Evaluation and Compilation
Evaluating a String
Function References and Calls
Compiling Code as a Function
Specifying the Functions Body
Using the Function Object with a Variable
Specifying Arguments
Using the Function Object with an Event Handler
Properties of the Function Object
Summary


Chapter 29General Software Detection
Browser Detection
What is the navigator Object?
Using the navigator Object to Detect the Users Browser and Platform
The User Agent
Determining the Users Browser
Redirecting the User to a Browser-Specific Page
Using Frames to Display Different Pages for Each Browser
Checking if Java is Enabled
Summary


Chapter 30Plug-ins
Embedding a Plug-in Object in HTML
Referencing Plug-ins in JavaScript
Determining Installed Plug-ins with JavaScript
Properties of the mimeTypes Object
Properties of the plugins Object
LiveAudio and LiveVideo
LiveAudio
LiveVideo
Other Plug-ins
Summary


Chapter 31LiveConnectConnecting JavaScript, Java, and Plug-ins
What is LiveConnect?
Enabling LiveConnect
The Java Console
Netscape Packages
Compiling Java Code with Netscape Packages
Java to JavaScript Communication
Passing Values Between Java and JavaScript
Getting a Handle for the Browser Window
Accessing JavaScript Objects and Properties
Calling JavaScript Methods
Other methods in the JSObject class
JavaScript Exception
JavaScript to Java Communication
Accessing Java Directly
Controlling Java Applets
The applet Object
What Else is Scriptable in an Applet?
Modifying an Applet
Why Make an Applet Scriptable?
Controlling Plug-ins
Accessing a Plug-ins Elements
JavaScript and LiveAudio
JavaScript and LiveVideo
Summary


Chapter 32JavaScript Extensions for Layers
Introduction to Layers
Defining a Layer
NAME
LEFT and TOP
WIDTH
CLIP
Z-INDEX, ABOVE, and BELOW
VISIBILITY
BGCOLOR and BACKGROUND
The Layer Object
Layer Object Properties
name
width and height
left and top
zIndex
visibility
clip.top, clip.left, clip.right, clip.bottom, clip.width, and clip.height
background
bgColor
siblingAbove and siblingBelow
above and below
parentLayer
layers
Layer Object Methods
offset()
moveTo()
resize()
moveAbove() and moveBelow()
Demonstration: A Pictorial Album of U.S. Presidents
Summary


Chapter 33Style Sheets
Introduction
Content Layout
Font Properties
Text Properties
Inheritance of Styles
Creating Style Sheets and Assigning Styles
Defining Styles with the <STYLE> Tag in the Header
Specifying Styles for Individual Elements
Defining Classes of Styles
Format Properties
Box Math
Replaced Elements
Setting Margins
Settting Border Width
Settting the Padding Size
Summary


Chapter 34Security Issues
History
e-mail Address Security
URL to URL Access Security
The Concept of Tainting
Enabling Data Tainting
Specific Tainting
Window Taint Accumulator
Summary


Chapter 35JavaScript Authoring Tools
Introduction
Top 10 Tips
Tip #1. Navigate Your Code with the Script Navigator
Tip #2. Integrated JavaScript Reference
Tip #3. Drag-&-Drop Into Your Source File
Tip #4. Instantiate JavaScript Objects
Tip #5. Using Special Inline Characters
Tip #6. Speed Up Your Typing with Natural Cursor Positioning
Tip #7. Reuse Your JavaScript Code
Tip #8. Customize Your Editor
Tip #9. Create Custom Objects
Tip #10. Finding That Matching Brace
Summary


Chapter 36Debugging Scripts
Types of Errors
Error Messages
string is not defined
string is not a function
unterminated string literal
missing } after function body
string is not a number
string has no property named property
string has no property indexed by [i ]
string cannot be set by assignment
test for equality (==) mistyped as assignment (=)? Assuming equality test
function does not always return a value
access disallowed from scripts at Url_1 to documents at URL_2
Lengthy JavaScript still running. Continue?
syntax error
Manual Debugging Techniques
Match Those Tag Pairs
View the Intermediate HTML Source
Reopen the File
Good Old Print Messages
Comment Out Statements
Watching and Tracing Variables
Getting it Right the First Time
Build the Scripts Skeleton First
Keep Testing While Developing
Evaluate Expressions Outside Your Source
Test Your Functions Outside Your Source
Testing Your Script
Summary
Appendix A
Appendix B
Appendix C
Index



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