Instructor's Resource Manual
to
Programming the World Wide Web
Fifth Edition
R.W. Sebesta
1
Preface
It is difficult to overestimate the effect the World Wide Web has had on the day-to-day lives of people, at
least those in the developed countries. In just a few years, we have learned to use the Web for a myriad of
disparate tasks, ranging from the mundane task of shopping for airline tickets to the crucial early-morning
gathering of business news for a high-stakes day trader.
The speed at which millions of Web sites have appeared would seem to indicate that the technologies
used to build them were sitting on the shelf, fully developed and ready to use, even before the Web was
developed. Also, one might guess that the tens of thousands of people who built those sites were sitting
around unemployed, waiting for an opportunity and already possessing the knowledge and abilities
required to carry out this mammoth construction task when it appeared. Neither of these was true. The need
for new technologies was quickly filled by a large number of entrepreneurs, some at existing companies
and some who started new companies. A large part of the programmer need was filled, at least to the extent
to which it has been filled, by new programmers, some straight from high school. Many, however, were
previously employed by other sectors of the software development industry. All of them had to learn to use
new languages and technologies.
Until recently, programmers learned Web software technologies through company in-house training, a
scattering of courses focused on one specific Web technology at colleges and universities, or on their own.
A visit to a local bookstore will turn up a large supply of books on those technologies aimed at the
practicing professional. In the last few years college courses have appeared that attempt to cover a broad
spectrum of Web programming technologies. One difficulty encountered by those teaching these courses is
the lack of textbooks that are targeted to their needs. Most of the books that discuss Web programming
were written for professionals, rather than college students. Such books are typically written to fulfill the
needs of professionals, which are quite different from those of college students. One major difference
between an academic book and a professional book lies in the assumptions made by the author about the
prior knowledge and experience of the audience. The backgrounds of professionals vary widely, making it
difficult to assume much of anything. On the other hand, a book written for junior computer science majors
can make some definite assumptions about the background of the reader. This book is aimed at college
students, not necessarily only computer science majors, but anyone who has taken at least two courses in
programming. Although students are the primary target, the book is also useful for professional
programmers who wish to learn Web programming.
The goal of this book is to provide the reader with a comprehensive introduction to the programming
tools and skills required to build and maintain server sites on the Web. A wide variety of technologies are
used in the construction of a Web site. There are now many books available for professionals that focus on
these technologies. For example, there are dozens of books that specifically address only XHTML. The
same is true for a half-dozen other technologies. This book provides an overview of how the Web works, as
well as descriptions of many of the most widely used Web technologies.
The first four editions of this book were used to teach a junior-level Web programming course at the
University of Colorado at Colorado Springs. The challenge for students in the course is to learn to use
several different programming languages and technologies in one semester. A heavy load of programming
exercises is essential to the success of the course. Students build a basic, static Web site using only
XHTML as the first assignment. Throughout the remainder of the semester they add features to their site as
the new technologies are discussed in the course. Our students’ prior course work in Java, data structures,
and assembly language are helpful, as is the fact that many of them know some XHTML before taking the
course.
The most important prerequisite to the material of this book is a solid background in programming in
some language that supports object-oriented programming. It is helpful to have some knowledge of a
second programming language and a bit of UNIX, particularly if a UNIX-based Web server is used for the
course. Familiarity with a second language makes learning the new languages easier.
Contents of the Chapters
The book is organized into three parts, introduction (Chapter 1), client-side technologies (Chapters 2–8),
and server-side technologies (Chapters 9–15).
2
Chapter 1 lays the groundwork for the rest of the book. A few fundamentals are introduced, including
the history and nature of the Internet, the World Wide Web, browsers, servers, URLs, MIME types, and
HTTP. Also included in Chapter 1 are brief overviews of the most important topics of the rest of the book.
Chapter 2 provides an introduction to XHTML, including images, links, lists, tables, frames, and
forms. Small examples are used to illustrate the many XHTML elements that are discussed in this chapter.
The topic of Chapter 3 is Cascading Style Sheets, which provide the standard way of imposing style on
the content specified in XHTML tags. Because of the size and complexity of the topic, the chapter does not
cover all of the aspects of style sheets. The topics discussed are levels of style sheets, style specification
formats, selector formats, property values, and color. Among the properties covered are those for fonts,
lists, and margins. Small examples are used to illustrate the subjects being discussed.
Chapter 4 introduces the core of JavaScript, a powerful language that could be used for a variety of
different applications. Our interest, of course, is its use in Web programming. Although JavaScript has
become a large and complex language, we use the student’s knowledge of programming in some other language to leverage our discussion, thereby providing a useful introduction to the language in a manageably
small number of pages. Topics covered are the object model of JavaScript, its control statements, objects,
arrays, functions, constructors, and pattern matching.
In Chapter 5 we discuss some of the features of JavaScript that are related to XHTML documents.
Included is the use of the basic and DOM 2 event and event-handling model, which can be used in
conjunction with some of the elements of XHTML documents.
One of the most exciting and interesting applications of JavaScript is for building dynamic XHTML
documents using the Document Object Model (DOM). Chapter 6 provides descriptions of a collection of
some of the document changes that can be made using JavaScript and the DOM. Included are element
positioning, moving elements, changing the visibility of elements, changing the color, style, and size of
text, changing the content of tags, changing the stacking order of overlapped elements, slow movement of
elements, and dragging and dropping elements.
Chapter 7 presents an introduction to XML, which provides the means to design topic-specific markup
languages that can be shared among users with common interests. Included are the syntax and document
structure used by XML, data type definitions, namespaces, schemas, and the display of XML documents
with both Cascading Style Sheets and XML Transformations. Also included is an introduction to Web
services and XML processors.
Chapter 8 introduces the Flash development environment, which is used to create a wide variety of
visual and audio presentations, particularly those that include animation. A series of examples are used to
illustrate the development processes, including drawing figures, creating text, using color, creating motion
and shape animations, and adding sound tracks to presentations.
Chapter 9 introduces PHP, a server-side scripting language that enjoys wide popularity, especially as a
database access language. The basics of the language are discussed, as well as the use of cookies and
session tracking. The use of PHP as a Web database access language is covered in Chapter 13.
Chapter 10 introduces Ajax, the relatively new technology that is used to build Web applications with
extensive user interactions that are more efficient. In addition to a thorough introduction to the concept and
implementation of Ajax interactions, the chapter includes discussions of return document forms, Ajax
toolkits, and Ajax security. Serveral examples are used to illustrate approaches to using Ajax.
Java Web software is discussed in Chapter 11. The chapter introduces the mechanisms for building
Java servlets and presents several examples of how servlets can be used to present interactive Web
documents. The NetBeans framework is introduced and used throughout the chapter. Two approaches to
storing information on clients using servlets, cookies and session tracking, are introduced and illustrated
with examples. Then JSP is introduced through a series of examples, including the use of code-behind files.
This is followed by a discussion of JavaBeans and JavaServer Faces.
Chapter 12 is an introduction to ASP.NET, though it begins with a brief introduction to C#. ASP.NET
Web controls and the many possible events and how they can be handled are among the topics discussed in
this chapter. ASP.NET AJAX is also discussed. Finally, constructing Web services with ASP.NET is
introduced.
Chapter 13 provides an introduction to database access through the Web. This chapter includes an
introduction to the nature of relational databases, architectures for database access, the structured query
language, SQL, and the free database system, MySQL. Then, two approaches to Web access to databases
are discussed: using PHP and using Java JDBC. Both approaches are illustrated with complete examples.
All of the program examples in the chapter use MySQL.
3
Chapter 14 introduces the Ruby programming language. Included are the scalar types and their
operations, control statements, arrays, hashes, methods, classes, code blocks and iterators, and pattern
matching. There is, of course, much more to Ruby, but the chapter includes sufficient material to allow the
student to use Ruby for building simple programs and Rails applications.
Chapter 15 introduces the Rails framework, designed to make the construction of Web applications
relatively quick and easy. Covered are simple document requests, both static and dynamic, applications
that use databases, and Ajax use with Rails. Rails 2.0, which is not compatible with earlier versions of
Rails, is used.
Appendix A introduces Java to those who have experience with C++ and object-oriented
programming. Students who do not know Java can learn enough of the language from this appendix to
allow them to understand the Java applets, servlets, JSP, and JDBC that appear in this book.
Appendix B is a list of over 140 named colors, along with their hex codings.
Appendix C discusses Java applets. First, the fundamentals of applet activities and the
paintComponent method are introduced. Then, the <object> tag and applet parameters are discussed.
Next, the apapendix introduces the graphics that can be created by applets. Applets that can interact with
the user through Swing widgets are then covered.
Support Materials
The supplements for the book are available at Addison-Wesley’s Web site www.aw.com/cssupport.
Support materials available to all readers of this book include
A set of lecture notes in the form of PowerPoint files. The notes were developed to be the basis for class
lectures on the book material.
Code for example programs
PowerPoint slides of all the figures
Additional support material including solutions to selected exercises are available only to instructors
adopting this textbook for classroom use. Please contact your school’s Addison-Wesley representative for
information on obtaining access to this material.
Software Availability
Most of the software systems described in this book are available free to students. These include browsers,
which provide interpreters for JavaScript and parsers for XML. Also, PHP, Ruby, and Java language
processors, as well as the Rails framework, Java class libraries to support servlets, and Java JDBC, are
available and free. ASP.NET is supported by the .NET software available from Microsoft. The Flash
development environment is available for 30 days free from Adobe.
Differences between the Fourth and Fifth Editions
The fifth edition differs significantly from the fourth. A new chapter, 8, on Flash was added. The chapter
on Ajax was moved from Chapter 15 to Chapter 10, reflecting its increasing importance. This chapter was
expanded by adding sections on return document forms, Ajax toolkits, and Ajax security. Also, the section
on Rails/Ajax was moved from the Rails chapter (15) to the Ajax chapter (10). A section on ASP.NET
AJAX was added to Chapter 12. The chapter on Rails (15) was heavily revised, in part to update it for Rails
2.0, which is not backward compatible with the previous versions. Coverage on scaffolding and migrations
was added to the chapter. Finally, the chapters on Perl and Perl/CGI were dropped from the book.
Throughout the book, numerous small changes were made to improve the correctness and clarity of the
material.
4
Table of Contents
1 Fundamentals
1
1.1 A Brief Introduction to the Internet 2
1.2 The World Wide Web 6
1.3 Web Browsers 7
1.4 Web Servers 8
1.5 Uniform Resource Locators 11
1.6 Multipurpose Internet Mail Extensions 13
1.7 The Hypertext Transfer Protocol 15
1.8 Security 18
1.9 The Web Programmer’s Toolbox 20
Summary 28
Review Questions 30
Exercises 32
2 Introduction to XHTML
35
2.1 Origins and Evolution of HTML and XHTML 36
2.2 Basic Syntax 38
2.3 Standard XHTML Document Structure 39
2.4Basic Text Markup 40
2.5 Images 49
2.6 Hypertext Links 54
2.7 Lists 57
2.8 Tables 63
2.9 Forms 71
2.10 Syntactic Differences between HTML and XHTML 84
Summary 85
Review Questions 86
Exercises 88
3 Cascading Style Sheets
91
3.1 Introduction 92
3.2 Levels of Style Sheets 93
3.3 Style Specification Formats 94
3.4 Selector Forms 96
3.5 Property Value Forms 99
3.6 Font Properties 100
3.7 List Properties 106
3.8 Color 110
3.9 Alignment of Text 112
3.10 The Box Model 114
3.11 Background Images 119
3.12 The <span> and <div> Tags 121
3.13Conflict Resolution 122
Summary 124
Review Questions 126
5
Exercises 127
4 The Basics of JavaScript
129
4.1 Overview of JavaScript 130
4.2 Object Orientation and JavaScript 133
4.3 General Syntactic Characteristics 134
4.4 Primitives, Operations, and Expressions 137
4.5 Screen Output and Keyboard Input 146
4.6 Control Statements 150
4.7 Object Creation and Modification 158
4.8 Arrays 159
4.9 Functions 164
4.10 An Example 169
4.11 Constructors 170
4.12Pattern Matching Using Regular Expressions 171
4.13Another Example 176
4.14 Errors in Scripts 177
Summary 179
Review Questions 181
Exercises 183
5 JavaScript and XHTML Documents
185
5.1 The JavaScript Execution Environment 186
5.2The Document Object Model 187
5.3 Element Access in JavaScript 190
5.4 Events and Event Handling 193
5.5 Handling Events from Body Elements 198
5.6 Handling Events from Button Elements 199
5.7 Handling Events from Text Box and Password Elements 205
5.8The DOM 2 Event Model 215
5.9 The navigator Object 220
5.10 DOM Tree Traversal and Modification 222
Summary 223
Review Questions 224
Exercises 225
6 Dynamic Documents with JavaScript
227
6.1 Introduction 228
6.2 Positioning Elements 228
6.3 Moving Elements 234
6.4 Element Visibility 237
6.5 Changing Colors and Fonts 238
6.6 Dynamic Content 242
6.7 Stacking Elements 245
6.8 Locating the Mouse Cursor 248
6.9 Reacting to a Mouse Click 251
6.10 Slow Movement of Elements 252
6.11 Dragging and Dropping Elements 255
Summary 260
6
Review Questions 260
Exercises 261
7 Introduction to XML
263
7.1 Introduction 264
7.2 The Syntax of XML 266
7.3 XML Document Structure 269
7.4 Document Type Definitions 270
7.5 Namespaces 277
7.6 XML Schemas 279
7.7 Displaying Raw XML Documents 287
7.8 Displaying XML Documents with CSS 289
7.9 XSLT Style Sheets 291
7.10 XML Processors 300
7.11 Web Services 302
Summary 303
Review Questions 305
Exercises 307
8 Introduction to Flash
309
8.1 Origins and Uses of Flash 310
8.2 A First Look at the Flash Authoring Environment 310
8.3 Drawing Tools 315
8.4 An Example−Static Graphics 322
8.5 An Example−Animation and Sound 329
8.6 User Interactions 336
Summary 340
Review Questions 341
Exercises 342
9 Introduction to PHP
345
9.1 Origins and Uses of PHP 346
9.2 Overview of PHP 346
9.3 General Syntactic Characteristics 347
9.4 Primitives, Operations, and Expressions 348
9.5 Output 354
9.6 Control Statements 356
9.7 Arrays 359
9.8 Functions 368
9.9 Pattern Matching 371
9.10 Form Handling 374
9.11 Files 380
9.12 Cookies 383
9.13 Session Tracking 386
Summary 386
Review Questions 388
Exercises 390
10
Introduction to Ajax
393
7
10.1 Overview of Ajax 394
10.2 The Basics of Ajax 397
10.3 Return Document Forms 407
10.4 Ajax Toolkits 411
10.5 Security and Ajax 419
Summary 420
Review Questions 421
Exercises 422
11
Java Web Software
423
11.1 Overview of Servlets 424
11.2 The NetBeans Integrated Development Environment 428
11.3 A Survey Example 437
11.4 Storing Information on Clients 444
11.5 Java Server Pages 454
11.6 JavaBeans 465
11.7 JavaServer Faces 470
Summary 479
Review Questions 480
Exercises 482
12
Introduction to ASP.NET
485
12.1 Overview of the .NET Framework 486
12.2 A Bit of C# 489
12.3 Introduction to ASP.NET 493
12.4 ASP.NET Controls 500
12.5 ASP.NET AJAX 518
12.6 Web Services 525
Summary 530
Review Questions 531
Exercises 533
13
Database Access through the Web
535
13.1 Relational Databases 535
13.2 An Introduction to the Structured Query Language 538
13.3 Architectures for Database Access 543
13.4 The MySQL Database System 546
13.5 Database Access with PHP and MySQL 548
13.6 Database Access with JDBC and MySQL 557
Summary 565
Review Questions 567
Exercises 568
14
Introduction to Ruby
569
14.1 Origins and Uses of Ruby 570
14.2 Scalar Types and Their Operations 562
14.3 Simple Input and Output 579
14.4 Control Statements 581
14.5 Fundamentals of Arrays 586
8
14.6 Hashes 592
14.7 Methods 594
14.8 Classes 598
14.9 Code Blocks and Iterators 604
14.10 Pattern Matching 607
Summary 610
Review Questions 611
Exercises 611
15
Introduction to Rails
613
15.1 Overview of Rails 614
15.2 Document Requests 616
15.3 Rails Applications with Databases 623
15.5 Rails with Ajax 643
Summary 651
Review Questions 653
Exercises 654
A
B
C
Introduction to Java 655
Named Colors and Their Hexadecimal Values 671
Java Applets 675
Index 703
9
Solutions to Selected Exercises
Chapter 2
Exercise 2.1
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e2_1.html
This is a solution to Exercise 2.1
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 2.1 </title>
</head>
<body>
<h2> Ruper B. Baggins </h2>
<p>
1321 Causeway Circle <br />
Middle, Earth <br />
[email protected]<br />
</p>
<hr />
<h3> Bush Watcher </h3>
<p>
<em> Forest Keepers, Limited </em> <br />
14 Cranberry Way <br />
Middle, Earth <br />
<strong> (no web site yet) </strong>
</p>
</body>
</html>
Exercise 2.3
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e2_3.html
This is a solution to Exercise 2.3
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 2.3 </title>
</head>
<body>
<h2> Ruper B. Baggins </h2>
<p>
10
1321 Causeway Circle <br />
Middle, Earth <br />
[email protected]<br /><br />
<a href = "e2_31.html"> Mr. Baggins' Background </a>
</p>
<hr />
<h3> Bush Watcher </h3>
<p>
<em> Forest Keepers, Limited </em> <br />
14 Cranberry Way <br />
Middle, Earth <br />
<strong> (no web site yet) </strong>
</p>
</body>
</html>
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e2_31.html
This is part of the solution to Exercise 2.3
(The second document for the background info)
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 2.3 (background) </title>
</head>
<body>
<p>
Although we share the same family name, I am not in any way
related to the famous (or is it infamous) adventurer, Bilbo.
I have a lovely wife, Elvira, and two grown children, Max
and Miriam. Max has chosen to follow me in my profession,
which is described below. Miriam is a beekeeper for the town
bookkeeper, who keeps bees as a second job.
</p>
<p>
I am employed by Forest Keepers, Limited. My job, as I understand
it, is to keep an eye on the 4 acres of wild cranberries that
grow in the swamp at the edge of the village forest. I am required
to file a daily report, in triplicate, on the condition of the
cranberry bushes. To accomplish my task, I walk by and inspect
every cranberry bush in the swamp every workday. My employer provides
me with wading boots for my job. I pick up the boots at the office
every weekday morning and turn them back in, after a thorough
cleaning, after each workday.
</p>
</body>
</html>
Exercise 2.4
<?xml version = "1.0"
encoding = "utf-8"?>
11
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e2_4.html
A solution to Exercise 2.4 - an unordered list
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Unordered List </title>
</head>
<body>
<h3> Grocery List </h3>
<ul>
<li> milk - 2%, 2 gallons </li>
<li> bread - butter top wheat </li>
<li> cheddar cheese - sharp, 1 lb. </li>
<li> soup - vegetable beef, 3 cans </li>
<li> hamburger - 80% fat free, 2 lbs. </li>
<li> orange juice - not from concentrate, 1/2 gallon </li>
<li> eggs - large, 1 dozen </li>
</ul>
</body>
</html>
Exercise 2.8
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e2_8.html
A solution to Exercise 2.8 - a nested, ordered list
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> An Ordered List </title>
</head>
<body>
<h3> My Uncles, Aunts, and Cousins </h3>
<ol>
<li> Violet Vinelli (my mother) </li>
<li> Frederick Vinelli
<ol>
<li> Mary Vinelli </li>
<li> Betty Ann Boop </li>
<li> Bob Vinelli </li>
<li> Roger Vinelli </li>
</ol>
</li>
<li> Maxine Robinson
<ol>
<li> John Robinson </li>
<li> Patty Robinson </li>
<li> Lucille Robinson </li>
</ol>
12
</li>
<li> Thomas Vinelli
<ol>
<li> Albert Vinelli </li>
<li> Alison MacKinsey </li>
<li> Alton Vinelli </li>
</ol>
</li>
</ol>
<ol>
<li> Albert Alphonso (my father) </li>
<li> Herbert Alphonso
<ol>
<li> Louise Alphonso </li>
<li> Pam Alphonso </li>
<li> Fred Alphonso </li>
</ol>
</li>
<li> Ann Marie Predicate
<ol>
<li> George Predicate </li>
<li> Michael Predicate </li>
<li> Darcie Predicate </li>
</ol>
</li>
<li> Ferdinand Alphonso
<ol>
<li> Noah Alphonso </li>
<li> Leah Alphonso </li>
<li> Jo Alphonso </li>
</ol>
</li>
</ol>
</body>
</html>
Exercise 2.9
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e2_9.html
A solution to Exercise 2.9 - a simple table
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> A simple table </title>
</head>
<body>
<table border = "border">
<caption> Trees </caption>
<tr>
<th> </th>
13
<th>
<th>
<th>
<th>
</tr>
<tr>
<th>
<td>
<td>
<td>
<td>
</tr>
<tr>
<th>
<td>
<td>
<td>
<td>
</tr>
<tr>
<th>
<td>
<td>
<td>
<td>
</tr>
<tr>
<th>
<td>
<td>
<td>
<td>
</tr>
</table>
</body>
</html>
Pine </th>
Maple </th>
Oak </th>
Fir </th>
Average Height (feet) </th>
55 </td>
50 </td>
50 </td>
65 </td>
Average Width (inches) </th>
18 </td>
26 </td>
24 </td>
28 </td>
Typical Lifespan (years) </th>
150 </td>
230 </td>
310 </td>
135 </td>
Leaf Type </th>
Long needles </td>
Broadleaf </td>
Split leaf </td>
Short needles </td>
Exercise 2.10
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e2_10.html
A solution to Exercise 2.10 - a simple table
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> A simple table </title>
</head>
<body>
<table border = "border">
<caption> Tree Characteristics </caption>
<tr>
14
<td rowspan = "2" colspan = "2"> </td>
<th colspan = "4"> Tree </th>
</tr>
<tr>
<th> Pine </th>
<th> Maple </th>
<th> Oak </th>
<th> Fir </th>
</tr>
<tr>
<th rowspan = "4"> Characteristic </th>
<th> Average Height (feet) </th>
<td> 55 </td>
<td> 50 </td>
<td> 50 </td>
<td> 65 </td>
</tr>
<tr>
<th> Average Width (inches) </th>
<td> 18 </td>
<td> 26 </td>
<td> 24 </td>
<td> 28 </td>
</tr>
<tr>
<th> Typical Lifespan (years) </th>
<td> 150 </td>
<td> 230 </td>
<td> 310 </td>
<td> 135 </td>
</tr>
<tr>
<th> Leaf Type </th>
<td> Long needles </td>
<td> Broadleaf </td>
<td> Split leaf </td>
<td> Short needles </td>
</tr>
</table>
</body>
</html>
Chapter 3
Exercise 3.1
/* Book Layout Style Sheet */
h1 {font: bold 24pt Helvetica 'Times New Roman'}
h2 {font: bold 20pt Helvetica 'Times New Roman'}
h3 {font: bold 16pt Helvetica 'Times New Roman'}
p {font: 12pt 'Times New Roman'}
15
Exercise 3.2
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e3_2.html
A solution to Exercise 3.2 - a styled table
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> A Styled Table </title>
<style type = "text/css">
<!-td.win {font-size: 16pt; color: red;}
td.lose {font-size: 14pt; color: blue;}
-->
</style>
</head>
<body>
<table border = "border">
<caption style = "font-size: 18pt"> Football Scores </caption>
<tr>
<th> Team </th>
<th> Score </th>
</tr>
<tr>
<th style = "font-family: 'Century Gothic';
font-style: italic;
color: gold;"> Colorado </th>
<td class = "win"> 30 </td>
</tr>
<tr>
<th style = "font-family: 'Century Gothic';
font-style: italic;
color: red;"> Nebraska </th>
<td class = "lose"> 29 </td>
</tr>
<tr>
<th style = "font-family: 'Century Gothic';
font-style: italic;
color: grey;"> Iowa State </th>
<td class = "win"> 17 </td>
</tr>
<tr>
<th style = "font-family: 'Century Gothic';
font-style: italic;
color: blue;"> Kansas </th>
<td class = "lose"> 10 </td>
</tr>
<tr>
<th style = "font-family: 'Century Gothic';
font-style: italic;
color: purple;"> Kansas State </th>
<td class = "win"> 48 </td>
</tr>
16
<tr>
<th style = "font-family: 'Century Gothic';
font-style: italic;
color: green;"> Missouri </th>
<td class = "lose"> 13 </td>
</tr>
</table>
</body>
</html>
Exercise 3.4
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e3_4.html
A solution for Exercise 3.4 - floating a text element
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> Floating a text element </title>
</head>
<body>
<p style = "float: left; width: 1.5in; margin-right: 10px;
margin-bottom: 10px;" >
My airplane soars like an eagle and handles like
a hummingbird.
</p>
<p>
The 210 is the flagship
single-engine Cessna aircraft. Although the 210 began as a
four-place aircraft, it soon acquired a third row of seats,
stretching it to a six-place plane. The 210 is classified
as a high-performance airplane, which means its landing
gear is retractable and its engine has more than 200
horsepower. In its first model year, which was 1960,
the 210 was powered by a 260-horsepower fuel-injected
six-cylinder engine that displaced 471 cubic inches.
The 210 is the fastest single-engine airplane ever
built by Cessna.
</p>
</body>
</html>
Exercise 3.6
17
<?xml version = "1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e36.html
A solution to Exercise 3.6
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> Exercise 3.6 </title>
<style type = "text/css">
ol {list-style-type: upper-roman;}
ol ol {list-style-type: upper-alpha;}
ol ol ol {list-style-type: decimal;}
li.pink {color: pink}
li.blue {color: blue}
li.red {color: red}
</style>
</head>
<body>
<ol>
<li class = "pink"> Compact Cars
<ol>
<li> Two door
<ol>
<li> Hyundai Accent </li>
<li> Chevrolet Cobalt </li>
<li> Honda Civic </li>
</ol>
</li>
<li> Four door
<ol>
<li> Hyundai Accent </li>
<li> Chevrolet Cobalt </li>
<li> Honda Civic </li>
</ol>
</li>
</ol>
</li>
<li class = "blue"> Midsize Cars
<ol>
<li> Two door
<ol>
<li> Honda Accord </li>
<li> Hyundai Genesis </li>
<li> Nissan Altima </li>
</ol>
</li>
<li> Four door
<ol>
<li> Honda Accord </li>
<li> Dodge Avenger </li>
<li> Ford Fusion </li>
</ol>
</li>
</ol>
</li>
18
<li class = "red"> Sports Cars
<ol>
<li> Coupe
<ol>
<li> Jaguar XK </li>
<li> Ford Mustang </li>
<li> Nissan Z </li>
</ol>
</li>
<li> Convertible
<ol>
<li> Mazda Miata </li>
<li> Ford Mustang </li>
<li> Lotus Elise </li>
</ol>
</li>
</ol>
</li>
</ol>
</body>
</html>
Exercise 3.12
<?xml version = "1.0" encoding = "utf-8" ?>
<!DOCTYPE html PUBLIC "-//w3c//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e312.html
A solution to Exercise 3.12
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> Exercise 3.12 </title>
<style type = "text/css">
dt {font-family: Courier; font-size: 12pt;}
dd {font-family: 'Times New Roman'; font-size: 14pt;
font-style: italic;}
</style>
</head>
<body>
<h3> Single-Engine Cessna Airplanes </h3>
<dl>
<dt> 152 </dt>
<dd> Two-place trainer </dd>
<dt> 172 </dt>
<dd> Smaller four-place airplane </dd>
<dt> 182 </dt>
<dd> Larger four-place airplane </dd>
<dt> 210 </dt>
<dd> Six-place airplane - high performance </dd>
</dl>
</body>
</html>
19
Chapter 4
Exercise 4.1
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e4_1.html - A solution to Exercise 4.1
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 4.1 </title>
</head>
<body>
<script type = "text/javascript">
<!-var number, square, cube;
document.write("Number, Square, Cube <br /><br />");
for (number = 5; number < 16; number++) {
square = number * number;
cube = number * square;
document.write(number + ", " + square + ",
}
// -->
</script>
</body>
</html>
"
+ cube + "<br />");
Exercise 4.2
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e4_2.html - A solution to Exercise 4.2
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 4.2 </title>
</head>
<body>
<script type = "text/javascript">
<!-var first = 1, second = 1, next, count;
document.write("First 20 Fibonacci Numbers <br/><br/>");
document.write("1 - 1 <br/> 2 - 1 <br/>");
for (count = 3; count <= 20; count++)
{
20
next = first + second;
document.write(count + " - " + next + "<br/>");
first = second;
second = next;
}
// -->
</script>
</body>
</html>
Exercise 4.4
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e4_4.html - A solution to Exercise 4.4
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 4.4 </title>
</head>
<body>
<script type = "text/javascript">
<!-var first = 1, second = 1, next, count;
number = prompt("How many Fibonacci numbers do you want? (3-50)", "");
if (number >= 3 && number <= 50) {
document.write("First " + number + " Fibonacci Numbers <br /><br
/>");
document.write("1 - 1 <br/> 2 - 1 <br />");
for (count = 3; count <= number; count++) {
next = first + second;
document.write(count + " - " + next + "<br />");
first = second;
second = next;
}
}
else
document.write("Error - number not in the range 3-50");
// -->
</script>
</body>
</html>
Exercise 4.6
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
21
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e4_6.html - A solution to Exercise 4.6
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 4.6 </title>
</head>
<body>
<script type = "text/javascript">
<!-var first = 1, second = 1, next, count;
str = prompt("Please input your sentence", "");
var words = str.split(" ");
words = words.sort();
words_len = words.length;
for (count = 0; count < words_len; count++)
document.write(words[count] + "<br/>");
// -->
</script>
</body>
</html>
Exercise 4.7
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e4_7.html - A solution to Exercise 4.7
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 4.7 </title>
<script type = "text/javascript">
<!-// A function to compare strings for reverse alphabetic order
function dec_order(a, b) {
if (a > b)
return -1;
else if (a < b)
return 1;
else return 0;
}
// -->
</script>
</head>
22
<body>
<script type = "text/javascript">
<!-var order, str, words, word_len, count;
// Get the input
str = prompt("Please input your sentence", "");
order = prompt("What order? (ascending or descending)", "");
// If the order is recognized, issue an error message
if (order != "descending" && order != "ascending")
document.write("Error - order is incorrectly specified <br/>");
// Otherwise, do the sort, depending on the requested order
else {
var words = str.split(" ");
if (order == "ascending")
words = words.sort();
else
words = words.sort(dec_order);
// Write out the results
words_len = words.length;
for (count = 0; count < words_len; count++)
document.write(words[count] + "<br/>");
}
// -->
</script>
</body>
</html>
Exercise 4.9
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e4_9.html - A solution to Exercise 4.9
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 4.9 </title>
<script type = "text/javascript">
<!-// Function e_names
// Parameter: an array of strings
// Returns: the number of given strings that end
//
in either "ie" or "y"
23
function e_names(names) {
var len, index, count = 0;
len = names.length;
// Loop to use pattern matching to produce the count
for (index = 0; index < len; index++) {
position1 = names[index].search(/ie$/);
position2 = names[index].search(/y$/);
if (position1 + position2 > -2)
count++;
}
return count;
}
// -->
</script>
</head>
<body>
<script type = "text/javascript">
<!-// Function e_names tester
var new_names = new Array ("freddie", "bob", "mieke", "yahoo2",
"georgey");
result = e_names(new_names);
document.write("The number of special names is: " + result + "<br/>");
// -->
</script>
</body>
</html>
Exercise 4.14
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e4_14.html - A solution to Exercise 4.14
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 4.14 </title>
<script type = "text/javascript">
<!-var result;
//
//
//
//
//
Function reverser
Parameter: a number
Returns: the number with its digits in reverse order
Note: Math.floor must be used to get the integer part
of the division operations
function reverser(num) {
24
var digit, position = 0;
// If the number has just one digit, that's it
if (num < 10)
return num;
// Get the first digit
result = num % 10;
num = Math.floor(num / 10);
// Loop to produce the result for the rest
do {
digit = num % 10;
result = 10 * result + digit;
num = Math.floor(num / 10);
} while (num >= 1);
return result;
}
// -->
</script>
</head>
<body>
<script type = "text/javascript">
<!-// Function reverser tester
var num1 = 2468, num2 = 7;
result = reverser(num1);
document.write("The reverse of 2468 is: " + result + "<br />");
result = reverser(num2);
document.write("The reverse of 7 is: " + result + "<br />");
// -->
</script>
</body>
</html>
Chapter 5
Exercise 5.1
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e51.hmtl
A solution to Exercise 5.1 - events with radio buttons
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 5.1 </title>
25
<script type = "text/javascript" src = "e51.js" >
</script>
</head>
<body>
<h4> Choose your favorite color </h4>
<form>
<label> <input type = "radio" name = "colorButton"
value = "red"
onClick = "colorChoice('red')" />
Red </label>
<br />
<label> <input type = "radio" name = "colorButton"
value = "blue"
onClick = "colorChoice('blue')" />
Blue </label>
<br />
<label> <input type = "radio" name = "colorButton"
value = "green"
onClick = "colorChoice('green')" />
Green </label>
<br />
<label> <input type = "radio" name = "colorButton"
value = "yellow"
onClick = "colorChoice('yellow')" />
Yellow </label>
<br />
<label> <input type = "radio" name = "colorButton"
value = "orange"
onClick = "colorChoice('orange')" />
Orange </label>
</form>
</body>
</html>
// e51.js - The JavaScript solution for Exercise 5.1
//
// The event handler function to produce an alert message
// about the chosen color
function colorChoice (color) {
switch (color) {
case "red":
alert("Your favorite
break;
case "blue":
alert("Your favorite
break;
case "green":
alert("Your favorite
break;
case "yellow":
alert("Your favorite
break;
case "orange":
alert("Your favorite
break;
default:
color is red");
color is blue");
color is green");
color is yellow");
color is orange");
26
alert("Error in JavaScript function colorChoice");
break;
}
}
Exercise 5.2
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e5_2.hmtl
A solution to Exercise 5.2 - events with radio buttons
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 5.2 </title>
<script type = "text/javascript" src = "e521.js" >
</script>
</head>
<body>
<h4> Choose your favorite color </h4>
<form id = "colorsForm">
<p>
<label> <input type = "radio" name = "colorButton"
value = "red" /> Red
</label>
</p> <p>
<label> <input type = "radio" name = "colorButton"
value = "blue" /> Blue
</label>
</p><p>
<label> <input type = "radio" name = "colorButton"
value = "green" /> Green
</label>
</p><p>
<label> <input type = "radio" name = "colorButton"
value = "yellow" /> Yellow
</label>
</p><p>
<label> <input type = "radio" name = "colorButton"
value = "orange" /> Orange
</label>
</p>
</form>
<script type = "text/javascript" src = "e522.js" >
</script>
</body>
</html>
// e521.js - JavaScript for the solution to Exercise 5.2
//
// The event handler function to produce an alert message
27
//
about the chosen color
function colorChoice () {
var color;
// Put the DOM address of the elements array in a local variable
var radioElement = document.getElementById("colorsForm").elements;
// Determine which button was pressed
for (var index = 0; index < radioElement.length; index++) {
if (radioElement[index].checked) {
color = radioElement[index].value;
break;
}
}
// Produce an alert message about the chosen color
switch (color) {
case "red":
alert("Your favorite color is red");
break;
case "blue":
alert("Your favorite color is blue");
break;
case "green":
alert("Your favorite color is green");
break;
case "yellow":
alert("Your favorite color is yellow");
break;
case "orange":
alert("Your favorite color is orange");
break;
default:
alert("Error in JavaScript function colorChoice");
break;
}
}
// e522.js - Handler registration for the solution to
//
Exercise 5.2
var dom = document.getElementById("colorsForm");
dom.elements[0].onclick = colorChoice;
dom.elements[1].onclick = colorChoice;
dom.elements[2].onclick = colorChoice;
dom.elements[3].onclick = colorChoice;
dom.elements[4].onclick = colorChoice;
28
Exercise 5.4
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e54.html
A solution to Exercise 5.4
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 5.4 </title>
<script type = "text/javascript" src = "e54.js" >
</script>
</head>
<body>
<h3> Order Form </h3>
<form name = "orderForm" onSubmit = "finish()">
<p>
<label> <input type = "text" name = "apples"
size = "3"
onChange = "appleHandler()" />
Apples
</label>
</p><p>
<label> <input type = "text" name = "oranges"
size = "3"
onChange = "orangeHandler()" />
Oranges
</label>
</p><p>
<label> <input type = "text" name = "bananas"
size = "3"
onChange = "bananaHandler()" />
Bananas
</label>
</p><p>
<input type = "reset" name = "reset" />
<input type = "submit" name = "submit" />
</p>
</form>
</body>
</html>
// e54.js - The JavaScript file for the solution
//
to Exercise 5.4
var total = 0;
// The event handler functions for the text boxes
function appleHandler() {
var number = document.orderForm.apples.value;
total = total + number * 0.59;
}
29
function orangeHandler() {
var number = document.orderForm.oranges.value;
total = total + number * 0.49;
}
function bananaHandler() {
var number = document.orderForm.bananas.value;
total = total + number * 0.39;
}
// The event handler function to produce the total cost message
// when "submit" is clicked
function finish() {
total = total * 1.05;
alert("Thank you for your order \n" +
"Your total cost is: $" + total + "\n");
}
Exercise 5.5
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e55.html
The XHTML part of a solution to Exercise 5.5
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 5.5 </title>
<script type = "text/javascript" src = "e551.js">
</script>
</head>
<body>
<h3> Order Form </h3>
<form name = "" onSubmit = "finish()">
<p>
<label> <input type = "text" id = "apples" size = "3" />
Apples
</label>
</p><p>
<label> <input type = "text" id = "oranges" size = "3" />
Oranges
</label>
</p><p>
<label> <input type = "text" id = "bananas" size = "3" />
Bananas
</label>
</p><p>
<input type = "reset" name = "reset" />
<input type = "submit" name = "submit" />
</p>
30
</form>
<script type = "text/javascript"
</script>
</body>
</html>
src = "e552.js">
// e551.js -- The JavaScript part of the solution
//
to Exercise 5.5
var total = 0;
// The event handler functions for the text boxes
function appleHandler() {
var myApple = document.getElementById("apples");
var number = myApple.value;
if (number < 0 || number > 99) {
alert("Error - the quantity you entered in not valid" +
"\n [It is not in the range of 0 - 99] \n" +
"Please enter a valid quantity");
myApple.focus();
myApple.select();
return false;
}
else {
total = total + number * 0.59;
return true;
}
}
function orangeHandler() {
var myOrange = document.getElementById("oranges");
var number = myOrange.value;
if (number < 0 || number > 99) {
alert("Error - the quantity you entered in not valid" +
"\n [It is not in the range of 0 - 99] \n" +
"Please enter a valid quantity");
myOrange.focus();
myOrange.select();
return false;
}
else {
total = total + number * 0.39;
return true;
}
}
function bananaHandler() {
var myBanana = document.getElementById("bananas");
var number = myBanana.value;
if (number < 0 || number > 99) {
alert("Error - the quantity you entered in not valid" +
"\n [It is not in the range of 0 - 99] \n" +
"Please enter a valid quantity");
myBanana.focus();
myBanana.select();
31
return false;
}
else {
total = total + number * 0.49;
return true;
}
}
// The event handler function to produce the total cost message
// when "submit" is clicked
function finish() {
total = total * 1.05;
alert("Thank you for your order \n" +
"Your total cost is: $" + total + "\n");
}
// e552.js - The JavaScript code to register the
//
handlers
document.getElementById("apples").onchange = appleHandler;
document.getElementById("oranges").onchange = orangeHandler;
document.getElementById("bananas").onchange = bananaHandler;
Exercise 5.6
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e56.html
A solution to Exercise 5.6
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 5.6 </title>
<script type = "text/javascript" src = "e561.js" >
</script>
</head>
<body>
<h3> Order Form </h3>
<form name = "orderForm" onSubmit = "finish()">
<p>
<label> <input type = "text" id = "apples"
size = "3" /> Apples
</label>
</p><p>
<label> <input type = "text" id = "oranges"
size = "3" /> Oranges
</label>
</p><p>
<label> <input type = "text" id = "bananas"
size = "3" /> Bananas
32
</label>
</p><p>
<input type = "reset" name = "reset" />
<input type = "submit" name = "submit" />
</p>
</form>
<script type = "text/javascript" src = "e562.js" >
</script>
</body>
</html>
// e561.js - Event handlers for the solution to
//
Exercise 5.6
var total = 0;
// The event handler functions for the text boxes
function appleHandler() {
var dom = document.getElementById("apples");
var number = dom.value;
if (number < dom.min || number > dom.max) {
alert("Error - the quantity you entered in not valid" +
"\n [It is not in the range of " + dom.min +
" to " + dom.max + "] \n" +
"Please enter a valid quantity");
dom.focus();
dom.select();
return false;
}
else {
total = total + number * 0.59;
return true;
}
}
function orangeHandler() {
var dom = document.getElementById("oranges");
var number = dom.value;
if (number < dom.min || number > dom.max) {
alert("Error - the quantity you entered in not valid" +
"\n [It is not in the range of " + dom.min +
" to " + dom.max + "] \n" +
"Please enter a valid quantity");
dom.focus();
dom.select();
return false;
}
else {
total = total + number * 0.39;
return true;
}
}
function bananaHandler() {
var dom = document.getElementById("bananas");
33
var number = dom.value;
if (number < dom.min || number > dom.max) {
alert("Error - the quantity you entered in not valid" +
"\n [It is not in the range of " + dom.min +
" to " + dom.max + "] \n" +
"Please enter a valid quantity");
dom.focus();
dom.select();
return false;
}
else {
total = total + number * 0.49;
return true;
}
}
// The event handler function to produce the total cost message
// when "submit" is clicked
function finish() {
total = total * 1.05;
alert("Thank you for your order \n" +
"Your total cost is: $" + total + "\n");
}
// e562.js - The body part of the JavaScript for the
//
solution to Exercise 5.6
// Get DOM addresses of the text boxes
var appleDom = document.getElementById("apples");
var orangeDom = document.getElementById("oranges");
var bananaDom = document.getElementById("bananas");
// Set the onchange properties for the event handlers
appleDom.onchange = appleHandler;
orangeDom.onchange = orangeHandler;
bananaDom.onchange = bananaHandler;
// Add properties for minimum and maximum values for the text boxes
appleDom.max = 99;
appleDom.min = 0;
orangeDom.max = 99;
orangeDom.min = 0;
bananaDom.max = 99;
bananaDom.min = 0;
Chapter 6
Exercise 6.1
<?xml version = "1.0"
encoding = "utf-8"?>
34
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e6_1.html
A solution to Exercise 6.1
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 6.1 </title>
<style type = "text/css">
/* A style for the paragraph of text */
.regtext {position: absolute; top: 100px; left: 100px;
font-family: Times; font-size: 14pt; width: 330px}
/* A style for the image */
.img {background-image: url(c172.gif); position: absolute;
left: 190px; top: 180px; width: 100px}
</style>
</head>
<body>
<p class = "img">
<br/><br/><br/><br/><br/>
</p>
<p class = "regtext">
I was born on July 4th,
1976, in Huckabee, Alaska.
I have three brothers and
a sister, all older than I.
My sister, Mary, is 26 years old.
She lives in Kalkan, Montana.
My oldest brother, Ron, is 32
years old. He lives in Huckabee.
My youngest brother, Max, is
28 years old. He lives in Pinkee,
Wyoming. My middle brother, Fred,
is 30 years old. He lives in
Kinkyhollow, Nebraska.
My parents, who are both still
living, still live in Huckabee.
</p>
</body>
</html>
Exercise 6.2
<?xml version = "1.0"
encoding = "utf-8"?>
35
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e62.html
The XHTML part of a solution to Exercise 6.2
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 6.2 </title>
<style type = "text/css">
/* A style for the paragraph of text */
.regtext {position: absolute; top: 150px; left: 100px;
font-family: Times; font-size: 14pt; width: 330px}
/* A style for the image */
.img {background-image: url(c172.gif); position: absolute;
left: 100px; top: 150px; width: 100px}
</style>
<script type = "text/javascript"
</script>
</head>
<body>
src = "e62.js" >
<h2> Background Image Position Control Buttons </h2>
<p>
<form name = "moveControl">
<label> <input type = "radio" name = "choser"
checked = "checked"
onclick = "moveIt('picture', 150, 100)"
Northwest
</label>
<p/><p>
<label> <input type = "radio" name = "choser"
onclick = "moveIt('picture', 150, 300)"
Northeast
</label>
</p><p>
<label> <input type = "radio" name = "choser"
onclick = "moveIt('picture', 300, 300)"
Southeast
</label>
<p/><p>
<label> <input type = "radio" name = "choser"
onclick = "moveIt('picture', 300, 100)"
Southwest
</label>
</p>
</form>
/>
/>
/>
/>
<p class = "img" id = "picture">
<br/><br/><br/><br/><br/>
</p>
36
<p class = "regtext">
I was born on July 4th,
1976, in Huckabee, Alaska.
I have three brothers and
a sister, all older than I.
My sister, Mary, is 26 years old.
She lives in Kalkan, Montana.
My oldest brother, Ron, is 32
years old. He lives in Huckabee.
My youngest brother, Max, is
28 years old. He lives in Pinkee,
Wyoming. My middle brother, Fred,
is 30 years old. He lives in
Kinkyhollow, Nebraska.
My parents, who are both still
living, still live in Huckabee.
</p>
</body>
</html>
// e62.js - The JavaScript file for the solution to
//
Exercise 6.2
/* A function to move an element */
function moveIt(movee, newTop, newLeft) {
dom = document.getElementById(movee).style;
/* Change the top and left properties to perform the move */
dom.top = newTop + "px";
dom.left = newLeft + "px";
}
Exercise 6.3
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e63.html
The XHTML part of a solution to Exercise 6.3
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 6.3 </title>
<style type = "text/css">
/* A style for the paragraph of text */
.regtext {position: absolute; top: 200px; left: 100px;
font-family: Times; font-size: 14pt; width: 330px}
37
</style>
<script type = "text/javascript"
</script>
</head>
src = "e63.js" >
<body>
<h2> Background Image Visibility Control Buttons </h2>
<form name = "visibilityControl">
<p>
<label> <input type = "checkbox" name = "choser"
onclick = "flipImage('northwest')"
Northwest
</label>
<p/><p>
<label> <input type = "checkbox" name = "choser"
onclick = "flipImage('northeast')"
Northeast
</label>
</p><p>
<label> <input type = "checkbox" name = "choser"
onclick = "flipImage('southeast')"
Southeast
</label>
</p><p>
<label> <input type = "checkbox" name = "choser"
onclick = "flipImage('southwest')"
Southwest
</label>
</p>
</form>
/>
/>
/>
/>
<p id = "northwest" style = "background-image: url(c172.gif);
visibility: hidden; position: absolute;
left: 100px; top: 200px; width: 100px">
<br/><br/><br/><br/><br/>
</p>
<p id = "northeast" style = "background-image: url(c172.gif);
visibility: hidden; position: absolute;
left: 300px; top: 200px; width: 100px">
<br/><br/><br/><br/><br/>
</p>
<p id = "southeast" style = "background-image: url(c172.gif);
visibility: hidden; position: absolute;
left: 300px; top: 350px; width: 100px">
<br/><br/><br/><br/><br/>
</p>
<p id = "southwest" style = "background-image: url(c172.gif);
visibility: hidden; position: absolute;
left: 100px; top: 350px; width: 100px">
<br/><br/><br/><br/><br/>
38
</p>
<p class = "regtext">
I was born on July 4th,
1976, in Huckabee, Alaska.
I have three brothers and
a sister, all older than I.
My sister, Mary, is 26 years old.
She lives in Kalkan, Montana.
My oldest brother, Ron, is 32
years old. He lives in Huckabee.
My youngest brother, Max, is
28 years old. He lives in Pinkee,
Wyoming. My middle brother, Fred,
is 30 years old. He lives in
Kinkyhollow, Nebraska.
My parents, who are both still
living, still live in Huckabee.
</p>
</body>
</html>
// e63.js - The JavaScript part of a solution to
//
Exercise 6.3
/* A function to change the visibility of an element */
function flipImage(img) {
dom = document.getElementById(img).style;
/* Change the visibility property */
if (dom.visibility == "visible" || dom.visibility == "show")
dom.visibility = "hidden";
else
dom.visibility = "visible";
}
Exercise 6.5
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e65.html
A solution to Exercise 6.5
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Exercise 6.5 </title>
39
<style type = "text/css" >
.planes {position: absolute; top: 100; left: 0; z-index: 0;" />
</style>
<script type = "text/javascript" src = "e65.js" >
</script>
</head>
<body>
<p>
<a href = "JAVASCRIPT:toTop('C172')">
1
</a>
</p><p>
<a href = "JAVASCRIPT:toTop('cix')">
2
</a>
</p><p>
<a href = "JAVASCRIPT:toTop('C182')">
3
</a>
</p><p>
<img class = "planes" id = "C172" src = "c172.gif"
alt = "(Picture of a C172)" />
<img class = "planes" id = "cix" src = "cix.gif"
alt = "(Picture of a Citation airplane)" />
<img class = "planes" id = "C182" src = "c182.gif"
alt = "(Picture of a C182)" />
</p><p></p>
</body>
</html>
// e65.js - The JavaScript part of a solution to
//
Exercise 6.5
var top = "C172";
function toTop(newTop) {
// Get DOM addresses for the new top and the old top elements
domTop = document.getElementById(top).style;
domNew = document.getElementById(newTop).style;
// Set the zIndex properties of the two elements
domTop.zIndex = "0";
domNew.zIndex = "10";
top = newTop;
}
Chapter 7
Exercise 7.1
<?xml version = "1.0"
encoding = "utf-8"?>
40
<!-- cars.dtd - a document type definition for
the cars.xml document
A solution to Exercise 7.1
-->
<!ELEMENT car_catalog (car+)>
<!ELEMENT car (make, model, year, color, engine,
number_of_doors, transmission_type, accessories)>
<!ELEMENT make (#PCDATA)>
<!ELEMENT model (#PCDATA)>
<!ELEMENT year (#PCDATA)>
<!ELEMENT color (#PCDATA)>
<!ELEMENT engine (number_of_cylinders, fuel_system)>
<!ELEMENT number_of_doors (#PCDATA)>
<!ELEMENT transmission_type (#PCDATA)>
<!ELEMENT accessories (#PCDATA)>
<!ATTLIST
<!ATTLIST
<!ATTLIST
<!ATTLIST
<!ATTLIST
<!ENTITY
<!ENTITY
<!ENTITY
<!ENTITY
<!ENTITY
<!ENTITY
accessories
accessories
accessories
accessories
accessories
c
f
d
h
n
t
radio CDATA #REQUIRED>
air_conditioning CDATA #REQUIRED>
power_windows CDATA #REQUIRED>
power_steering CDATA #REQUIRED>
power_brakes CDATA #REQUIRED>
"Chevrolet">
"Ford">
"Dodge">
"Honda">
"Nisson">
"Toyota">
Exercise 7.2
<?xml version = "1.0"
encoding = "utf-8"?>
<!-- cars.xml - A solution to Exercise 7.2
-->
<!DOCTYPE car_catalog SYSTEM "cars.dtd">
<?xml-stylesheet type = "text/css" href = "cars.css"?>
<car_catalog>
<car>
<year> 1997 </year>
<make> &c; </make>
<model> Impala </model>
<color> Light blue </color>
<engine>
<number_of_cylinders> 8 cylinder
</number_of_cylinders>
<fuel_system> multi-port fuel injected </fuel_system>
</engine>
<number_of_doors> 4 door </number_of_doors>
<transmission_type> 4 speed automatic
</transmission_type>
<accessories radio = "yes" air_conditioning = "yes"
power_windows = "yes"
41
power_steering = "yes"
power_brakes = "yes" />
</car>
<car>
<year> 1965 </year>
<make> &f; </make>
<model> Mustang </model>
<color> White </color>
<engine>
<number_of_cylinders> 8 cylinder
</number_of_cylinders>
<fuel_system> 4BBL carburetor </fuel_system>
</engine>
<number_of_doors> 2 door </number_of_doors>
<transmission_type> 3 speed manual </transmission_type>
<accessories radio = "yes" air_conditioning = "no"
power_windows = "no" power_steering = "yes"
power_brakes = "yes" />
</car>
<car>
<year> 1985 </year>
<make> &t; </make>
<model> Camry </model>
<color> Blue </color>
<engine>
<number_of_cylinders> 4 cylinder
</number_of_cylinders>
<fuel_system> fuel injected </fuel_system>
</engine>
<number_of_doors> 4 door </number_of_doors>
<transmission_type> 4 speed manual </transmission_type>
<accessories radio = "yes" air_conditioning = "yes"
power_windows = "no" power_steering = "yes"
power_brakes = "yes" />
</car>
</car_catalog>
Exercise 7.4
<!-- cars.css - a style sheet for the cars.xml document
A solution to Exercise 8.4
-->
car {display: block; margin-top: 15px; color: blue;}
year, make, model {color: red; font-size: 16pt;}
color {display: block; margin-left: 20px; font-size: 12pt;}
engine {display: block; margin-left: 20px;}
number_of_cylinders {font-size: 12pt;}
fuel_system {font-size: 12pt;}
number_of_doors {display: block; margin-left: 20px; font-size: 12pt;}
transmission_type {display: block; margin-left: 20px; font-size: 12pt;}
Exercise 7.5
42
<?xml version = "1.0" encoding = "utf-8"?>
<!-- xslcar.xsl
A solution to Exercise 7.5
-->
<xsl:stylesheet xmlns:xsl = "http://www.w3.org/TR/WD-xsl"
xmlns = "http://www.w3.org/TR/REC-html40">
<xsl:template match = "/">
<h2> Car Description </h2>
<span style = "font-style: italic"> Year: </span>
<xsl:value-of select = "car_catalog/car/year" /> <br />
<span style = "font-style: italic"> Make: </span>
<xsl:value-of select = "car_catalog/car/make" /> <br />
<span style = "font-style: italic"> Model: </span>
<xsl:value-of select = "car_catalog/car/model" /> <br />
<span style = "font-style: italic"> Color: </span>
<xsl:value-of select = "car_catalog/car/color" /> <br />
<span style = "font-style: italic"> Cylinders: </span>
<xsl:value-of select =
"car_catalog/car/engine/number_of_cylinders" /> <br />
<span style = "font-style: italic"> Fuel system: </span>
<xsl:value-of select = "car_catalog/car/engine/fuel_system" />
<br />
<span style = "font-style: italic"> Doors: </span>
<xsl:value-of select = "car_catalog/car/number_of_doors" />
<br />
</xsl:template>
</xsl:stylesheet>
Exercise 7.6
<?xml version = "1.0" encoding = "utf-8"?>
<!-- xslcars.xsl
A solution to Exercise 7.6
-->
<xsl:stylesheet xmlns:xsl = "http://www.w3.org/TR/WD-xsl"
xmlns = "http://www.w3.org/TR/REC-html40">
<xsl:template match = "/">
<h2> Car Description </h2>
<xsl:for-each select = "car_catalog/car">
<span style = "font-style: italic"> Year: </span>
<xsl:value-of select = "year" /> <br />
<span style = "font-style: italic"> Make: </span>
<xsl:value-of select = "make" /> <br />
<span style = "font-style: italic"> Model: </span>
<xsl:value-of select = "model" /> <br />
<span style = "font-style: italic"> Color: </span>
<xsl:value-of select = "color" /> <br />
<span style = "font-style: italic"> Cylinders: </span>
<xsl:value-of select = "engine/number_of_cylinders" />
43
<br />
<span style =
<xsl:value-of
<span style =
<xsl:value-of
<br /><br />
</xsl:for-each>
"font-style: italic"> Fuel system: </span>
select = "engine/fuel_system" /> <br />
"font-style: italic"> Doors: </span>
select = "number_of_doors" />
</xsl:template>
</xsl:stylesheet>
Chapter 9
Exercise 9.1
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!--
e9_1.php
A solution to Exercise 9.1
-->
<html>
<head> <title> e9_1.php </title>
<?php
function unique($strings) {
$uniqueStrings = array();
foreach ($strings as $string) {
foreach ($uniqueStrings as $uString) {
if ($string == $uString) break;
}
if ($string != $uString)
$uniqueStrings[] = $string;
}
return $uniqueStrings;
}
?>
</head>
<body>
<?php
$str = array(42, 24, 2, 4, 42, 24, 2, 4, 24, 42, 42, 24);
$uStr = unique($str);
foreach ($uStr as $st)
print ("$st <br />");
?>
</body>
</html>
Exercise 9.3
44
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!--
e9_3.php
Uses a function to determine the three most frequently
occurring strings in a given array of strings and returns
them in an array.
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> e9_3.php </title>
</head>
<body>
<?php
// Function the_three
// Parameter: an array of string
// Returns: an array of the three strings that occur most often
//
in the given array
function the_three($in_array) {
// Create the empty word frequency array
$freq = array();
// Loop to count the words (either increment or initialize to 1)
foreach ($in_array as $word) {
$keys = array_keys($freq);
if(in_array($word, $keys))
$freq[$word]++;
else
$freq[$word] = 1;
}
arsort($freq);
$new_keys = array_keys($freq);
return array($new_keys[0], $new_keys[1], $new_keys[2]);
} #** End of the_three
// Main test driver
$test_array = array("apples", "are", "good", "for", "you", "or",
"don't", "you", "like", "apples", "or", "maybe", "you", "like",
"oranges", "better", "than", "apples");
// Call the function
$tbl = the_three($test_array);
// Display the words and their frequencies
print "<br /> The Three Most Frequently Occurring Words<br /><br />";
$sorted_keys = array_keys($tbl);
sort($sorted_keys);
foreach ($sorted_keys as $word)
45
print "$tbl[$word] <br />";
?>
</body>
</html>
Exercise 9.5
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!--
e9_5.php
Use a function to find the first four-digit number
in a given string.
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> e9_5.php </title>
</head>
<body>
<?php
// Function first_four
// Parameter: a string containing numbers separated by spaces
// Returns: the first four-digit number found in the string;
//
returns zero if the string has no four-digit
//
number
function first_four($str) {
// Split the given string into its numbers
$numbers = preg_split("/ +/", $str);
foreach ($numbers as $numb)
if (strlen($numb) == 4)
return $numb;
// If there was no four-digit number, return false
return false;
} #** End of first_four
// Main test driver
$test_str = "22 1 444 66 333 4444 55555 66666 2 1 9 555";
// Call the function
$result = first_four($test_str);
// If the returned value has four digits, display it
if ($result != 0)
print("The first four-digit number is: $result <br />");
46
else
print("There was no four-digit number in the string <br />");
?>
</body>
</html>
Exercise 9.7
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!--
e9_7.php
Uses a function to determine the three most frequently
occurring words in the given string, where the words
are delimited on the left by spaces and on the right
by commas, periods, or question marks
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> e9_7.php </title>
</head>
<body>
<?php
// Function the_three
// Parameter: a string containing words that are delimited
//
on the left by spaces and on the right by
//
commas, periods, or question marks
// Returns: an array of the three words that occur most often
//
in the given array
function the_three($in_str) {
// Split the string into its words
preg_match_all("/ +[A-Za-z]+[,.?]/u", $in_str, $word_list);
foreach ($word_list[0] as $word)
print("The words are: $word <br />");
// Create the empty word frequency array
$freq = array();
// Loop to count the words (either increment or initialize to 1)
foreach ($word_list[0] as $word) {
// First, get rid of the delimiters
preg_match("/[A-Za-z]+/", $word, $match);
$word = $match[0];
// Now, get an array of the keys
$keys = array_keys($freq);
// Set the frequency for the work
47
if(in_array($word, $keys))
$freq[$word]++;
else
$freq[$word] = 1;
}
// Sort the frequency array in reverse order of values
arsort($freq);
// Get the keys and return the first three
$new_keys = array_keys($freq);
return array($new_keys[0], $new_keys[1], $new_keys[2]);
} #** End of the_three
// Main test driver
$test_str = " apples. are, good? for, you, or,
don't? you, like? apples, or. maybe. you, like,
oranges, better. than. apples?";
// Call the function
$tbl = the_three($test_str);
// Display the words and their frequencies
print "<br /> The Three Most Frequently Occurring Words<br /><br />";
$sorted_keys = array_keys($tbl);
sort($sorted_keys);
foreach ($sorted_keys as $word)
print "$tbl[$word] <br />";
?>
</body>
</html>
Exercise 9.9
<?xml version = "1.0" encoding = "utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e99.html
A solution to Exercise 9.9
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> Exercise 9.9 </title>
</head>
<body>
<a href = "e99.php"> Please give me a greeting </a>
</body>
48
</html>
<?xml version = "1.0" encoding = "utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e99.php
The php part of a solution to Exercise 9.9
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> Exercise 9.9 </title>
</head>
<body>
<?php
$greetings = array("Hello!", "Hej!", "Hallo!", "Hola!",
"Bonjour!");
$sub = rand(0, 4);
print "$greetings[$sub]";
?>
</body>
</html>
Chapter 10
Exercise 10.3
<?xml version = "1.0" encoding = "utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- e103.html
This is the XHTML part of a solution to
Exercise 10.3. Uses Ajax and the name to fill
in the customer's address, given his or her name
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> Popcorn Sales Form (Ajax) </title>
<style type = "text/css">
img {position: absolute; left: 400px; top: 50px;}
</style>
<script type = "text/JavaScript" src = "e103.js">
</script>
</head>
<body>
<h2> Welcome to Millenium Gynmastics Booster Club Popcorn
Sales
</h2>
<form action = "">
<!-- A borderless table of text widgets for name and address -->
49
<table>
<tr>
<td> Buyer's Name: </td>
<td> <input type = "text" name = "name"
onblur = "getAddress(this.value)"
size = "30" />
</td>
</tr>
<tr>
<td> Street Address: </td>
<td> <input type = "text" name = "address"
id = "address"
size = "30" />
</td>
</tr>
<tr>
<td> Zip code: </td>
<td> <input type = "text" name = "zip"
size = "10" />
</td>
</tr>
<tr>
<td> City </td>
<td> <input type = "text" name = "city"
size = "30" />
</td>
</tr>
<tr>
<td> State </td>
<td> <input type = "text" name = "state"
size = "30" />
</td>
</tr>
</table>
<img src = "popcorn.jpg"
<p />
alt = "picture of popcorn" />
<!-- The submit and reset buttons -->
<p>
<input type = "submit" value = "Submit Order" />
<input type = "reset" value = "Clear Order Form" />
</p>
</form>
</body>
</html>
// e103.js
// Ajax JavaScript code for the e103.html document
/********************************************************/
// function getAddress
// parameter: name
// action: create the XMLHttpRequest object, register the
//
handler for onreadystatechange, prepare to send
50
//
//
//
//
//
the request (with open), and send the request,
along with the name, to the server
includes: the anonymous handler for onreadystatechange,
which is the receiver function, which gets the
response text, and puts it in the document
function getAddress(name) {
alert ("The value of name in getAddress is:" + name + "\n");
var xhr = new XMLHttpRequest();
// Register the embedded receiver function as the handler
xhr.onreadystatechange = function () {
if (xhr.readyState == 4) {
var result = xhr.responseText;
alert ("responseText is: " + result + "\n");
document.getElementById("address").value = result;
}
}
xhr.open("GET", "getStreet.php?name=" + name, true);
xhr.send(null);
}
<?php
// getStreet.php
// Gets the form value from the "name" widget, looks up the
// address for that name, and prints it for the
// form
$addresses = array("John Beagle" => "1301 East 12th Street",
"Fred Magillicoti" => "12361 Bellview Road",
"John Smith" => "127 North Main Street",
"Mike Mutt" => "422 Dogtail Road",
"Pussy Cat" => "8913 Alans Alley"
);
$name = $_GET["name"];
if (array_key_exists($name, $addresses))
print $addresses[$name];
else
print " ";
?>
Exercise 10.5
<!-- e105.html
Solution to Exercise 10.5
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> Popcorn Sales Form (Ajax-Dojo) </title>
<style type = "text/css">
img {position: absolute; left: 400px; top: 50px;}
</style>
<script type = "text/javascript"
src = "dojo/dojo.js">
</script>
51
<script type = "text/javascript" src = "e105.js">
</script>
</head>
<body>
<h2> Welcome to Millenium Gynmastics Booster Club Popcorn
Sales
</h2>
<form action = "">
<!-- A borderless table of text widgets for name and address -->
<table>
<tr>
<td> Buyer's Name: </td>
<td> <input type = "text" name = "name"
size = "30" />
</td>
</tr>
<tr>
<td> Street Address: </td>
<td> <input type = "text" name = "street"
size = "30" />
</td>
</tr>
<tr>
<td> Zip code: </td>
<td> <input type = "text" name = "zip"
size = "10"
onblur = "getPlace(this.value)" />
</td>
</tr>
<tr>
<td> City </td>
<td> <input type = "text" name = "city"
id = "city" size = "30" />
</td>
</tr>
<tr>
<td> State </td>
<td> <input type = "text" name = "state"
id = "state" size = "30" />
</td>
</tr>
</table>
<img src = "popcorn.jpg"
<p />
alt = "picture of popcorn" />
<!-- The submit and reset buttons -->
<p>
<input type = "submit" value = "Submit Order" />
<input type = "reset" value = "Clear Order Form" />
</p>
</form>
</body>
52
</html>
// e105.js
// Ajax JavaScript code for the e105.html document
/********************************************************/
// function getPlace
// parameter: zip code
// action: call dojo.io.bind to do the Ajax request for
//
the city and state
function getPlace(zip) {
dojo.io.bind({
url: "getCityState.php?zip=" + zip,
load: function (type, data, evt) {
var place = data.split(', ');
if (dojo.byId("city").value == "")
dojo.byId("city").value = place[0];
if (dojo.byId("state").value == "")
dojo.byId("state").value = place[1];
},
error: function (type, data, evt) {
alert("Error in request, returned data: " + data);
},
method: "GET",
mimetype: "text/plain"
} );
}
Chapter 11
Exercise 11.2
<%-Document
Created on
Author
Purpose
:
:
:
:
index (of the greet5 (Exercise 11.2) project)
Mar 14, 2009, 8:23:49 PM
bob
Display one of five different
greetings on each call (Exercise 11.2)
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
<title>Exercise 11.2</title>
</head>
<body>
53
<form action = "Greet5" method = "get">
<p>
Press the button to get a greeting
<input type = "submit" value = "Get greeting" />
</p>
</form>
</body>
</html>
/* Greet5 servlet (Exercise 11.2) */
import
import
import
import
import
import
java.io.IOException;
java.io.PrintWriter;
javax.servlet.ServletException;
javax.servlet.http.HttpServlet;
javax.servlet.http.HttpServletRequest;
javax.servlet.http.HttpServletResponse;
public class Greet5 extends HttpServlet {
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String [] messages = {"Howdy!", "Hej!", "Hallo!", "Hola!",
"Bonjour!"};
int sub;
try {
/* TODO output your page here */
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet Greet5</title>");
out.println("</head>");
out.println("<body>");
sub = (int) (Math.random() * 5);
out.println("<strong>" + messages[sub] + "</strong>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}
Exercise 11.2
<%-Document
: index - for the solution to Exercise 11.4
Created on : May 24, 2008, 8:37:33 PM
Author
: bob
54
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
<title>Exercise 11.4</title>
</head>
<body>
<form method="POST" action="Survey">
<h2>
Welcome to the Consumer Electronics Purchasing Survey
</h2>
<p />
<h4> Your Gender: </h4>
<p>
<label>
<input type="radio" name="gender" value="female"
checked="checked" />
Female <br />
</label>
<label>
<input type="radio" name="gender" value="male" />
Male <br /> <br /> <br />
</label>
</p>
<p>
<label>
<input type="radio" name="vote" value="0" />
Conventional TV <br />
</label>
<label>
<input type="radio" name="vote" value="1" />
HDTV <br />
</label>
<label>
<input type="radio" name="vote" value="2" />
MP3 player <br />
</label>
<label>
<input type="radio" name="vote" value="3" />
CD player <br />
</label>
<label>
<input type="radio" name="vote" value="4" />
Mini CD player/recorder <br />
</label>
<label>
<input type="radio" name="vote" value="5" />
DVD player <br />
</label>
<label>
<input type="radio" name="vote" value="6"
55
checked="checked" />
Other <br /> <br />
</label>
<input type = "submit" value = "Submit Vote" />
<input type = "reset" value = "Clear Vote Form" />
</p>
</form>
</body>
</html>
/* e114 - Servlet for Exercise 11.4 */
import
import
import
import
java.io.*;
java.net.*;
javax.servlet.*;
javax.servlet.http.*;
public class Survey extends HttpServlet {
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
int votes[] = null;
int index;
int sumFemales, sumMales;
int vote;
File survdat = new File("survdat.dat");
String gender;
String products[] = {"Conventional TV", "HDTV", "MP3 player",
"CD player", "Mini CD player/recorder", "DVD player", Other"};
// Set the content type for the response output and get a
// writer
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
// Create the initial part of the response document
out.println("<html>");
out.println("<head>");
out.println("<title>Return message</title>");
out.println("</head>");
out.println("<body>");
// Synchronize a block for the votes file access
synchronized (this) {
// If the file already exists, read in its data
try {
if (survdat.exists()) {
ObjectInputStream indat = new
ObjectInputStream(
new FileInputStream(survdat));
votes = (int[]) indat.readObject();
indat.close();
}
// If the file does not exist (this is the first
56
// vote), create the votes array
else {
votes = new int[15];
votes[14] = 0;
}
} catch (Exception e) {
e.printStackTrace();
}
// Get the gender of the survey respondee
gender = request.getParameter("gender");
// Increment the visits counter
votes[14]++;
// Add the consumer electronics vote of the response to
// the votes array
vote = Integer.parseInt(request.getParameter("vote"));
if (gender.equals("male")) {
vote += 7;
}
votes[vote]++;
//Write updated votes array to disk
ObjectOutputStream outdat = new ObjectOutputStream(
new FileOutputStream(survdat));
outdat.writeObject(votes);
outdat.flush();
outdat.close();
}
//** end of the synchronized block
// Create the initial response information
out.println(
"<h3> Thank you for participating in the");
out.println(" Consumer Electronics Survey </h3>");
out.println("You are visitor number " + votes[14] +
"<br />");
out.println("<h4> Current Survey Results: </h4>");
// Create the total votes return information for female
// respondents
out.println("<h5> For Female Respondents </h5>");
// First, sum the votes for females and males
sumFemales = 0;
sumMales = 0;
for (index = 0; index < 7; index++) {
sumFemales += votes[index];
sumMales += votes[index + 7];
}
for (index = 0; index < 7; index++) {
out.print(products[index]);
out.print(": ");
if (sumFemales > 0) {
out.print((100 * votes[index]) / sumFemales);
out.println("%");
57
}
else
out.println(0);
out.println("<br />");
}
// Create the total votes return information for male
// respondents
out.println("<h5> For Male Respondents </h5>");
for (index = 7; index < 14; index++) {
out.print(products[index - 7]);
out.print(": ");
if (sumMales > 0) {
out.print((100 * votes[index]) / sumMales);
out.println("%");
}
else
out.println(0);
out.println("<br />");
}
out.close();
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}
Exercise 11.7
<%-Document
: index for Exercise 11.7
Created on : May 25, 2008, 9:17:57 PM
Author
: bob
Presents a ballot to the user and calls
the VoteCounter2 servlet for form handling
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
<title> Ballot </title>
</head>
<body>
<form action="VoteCounter2" method="POST">
<h3> Please choose one candidate for dogcatcher </h3>
58
<p>
<input type="radio" name="vote1" value="Dogman" />
Daren Dogman <br />
<input type="radio" name="vote1" value="Taildragger" />
Timmy Taildragger <br />
<input type="radio" name="vote1" value="Dogpile" />
Don Dogpile <br />
</p>
<h3> Please choose one candidate for catcatcher </h3>
<p>
<input type="radio" name="vote2" value="Catland" />
Kitty Catland <br />
<input type="radio" name="vote2" value="El Gato" />
Al El Gato <br />
<input type="radio" name="vote2" value="Katnip" />
Kitten Katnip <br />
<input type="radio" name="vote2" value="Cat" />
Tommie Cat <br />
<input type="radio" name="vote2" value="Feline" />
Fred Feline <br />
</p><p>
<input type = "submit" value = "Submit ballot" />
</p>
</form>
</body>
</html>
// VoteCounter2.java - Exercise 11.7
// This servlet processes the ballot form, returning a
// document asking fo ra new vote if no vote was made on the
// ballot. For legitimate ballots, the vote is added to
// the current totals, and those totals are presented to
// the user in a return document.
// A cookie is returned to the voter, recording the fact
// that a vote was received. The servlet examines all votes
// for cookies to ensure that there is no multiple voteing.
// The voting data file, votesdat2.dat, is stored on the Web
// server.
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class VoteCounter2 extends HttpServlet {
Cookie cookies[] = null;
int index;
PrintWriter out;
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
Cookie newCookie;
int votes[] = null;
int sumCatVotes;
int sumDogVotes;
String vote1;
59
String vote2;
File votesdat2 = new File("votesdat2.dat");
String dogCandidates[] = {"Daren Dogman", "Timmy Taildragger",
"Don Dogpile"};
String catCandidates [] = {"Kitty Catland", "Al El Gato",
"Kitten Katnip", "Tommie Cat", "Fred Feline"};
// Get cookies from the request
cookies = request.getCookies();
// Check to see if there was a vote on the form
vote1 = request.getParameter("vote1");
vote2 = request.getParameter("vote2");
if (vote1 == null || vote2 == null) { //** No legal vote
// Create the return document
makeHeader(response);
out.println(
"You did not vote for both <br />");
out.println(
"Please mark the ballot completely and resubmit");
} //** end of if (vote == null) ...
else { //** There was a vote
// Check to see if this client voted before
if (!votedBefore()) {
// No previous vote, so get the contents of the file
// (if the file already exists)
// Synchronize block for file input/output
synchronized (this) {
if (votesdat2.exists()) {
ObjectInputStream indat =
new ObjectInputStream(
new FileInputStream(votesdat2));
// We need the try/catch here because
// readObject can throw ClassNotFoundException
try {
votes = (int[]) indat.readObject();
} catch (ClassNotFoundException problem) {
problem.printStackTrace();
}
} //** end of if(votesdat.exists() ...
// If the file does not exist (this is the first
// vote), create the votes array
else {
votes = new int[8];
}
// Add the new vote to the votes array
if (vote1.equals("Dogman"))
votes[0]++;
else if (vote1.equals("Taildragger"))
votes[1]++;
else votes[2]++;
60
if (vote2.equals("Catland"))
votes[3]++;
else if (vote2.equals("El Gato"))
votes[4]++;
else if (vote2.equals("Katnip"))
votes[5]++;
else if (vote2.equals("Cat"))
votes[6]++;
else votes[7]++;
}
// Write updated votes array to disk
ObjectOutputStream outdat = new ObjectOutputStream(
new FileOutputStream(votesdat2));
outdat.writeObject(votes);
outdat.flush();
outdat.close();
//** end of synchronized block
// Attach a cookie to the response
newCookie = new Cookie("iVoted", "true");
newCookie.setMaxAge(5);
//** Set to 5 for testing
response.addCookie(newCookie);
// Write a response message
makeHeader(response);
out.println("Your vote has been received");
out.println(
"<br /><br /> Current Voting Percentages: <br />");
// Compute the total dog and cat votes
sumCatVotes = 0;
sumDogVotes = 0;
for (index = 0; index < 3; index++)
sumDogVotes += votes[index];
for (index = 3; index < 8; index++)
sumCatVotes += votes[index];
// Create the dog votes percentages
out.println("<h3> For Dogcatcher </h3>");
for (index = 0; index < 3; index++) {
out.print(dogCandidates[index]);
out.print(": ");
if (sumDogVotes > 0)
out.println(
((100 * votes[index]) / sumDogVotes) +
"% <br />");
else
out.println(0 + "% <br />");
}
// Create the cat votes percentages
out.println("<br /> <br /> <h3> For Catcatcher </h3>");
for (index = 3; index < 8; index++) {
out.print(catCandidates[index - 3]);
out.print(": ");
if (sumCatVotes > 0)
61
out.println(((100 * votes[index]) /
sumCatVotes) + "% <br />");
else
out.println(0 + "% <br />");
}
} //** end of if (!votedBefore() ...
else { // The client voted before
}
// Write a response message
makeHeader(response);
out.println(
"Your vote is illegal - you have already voted!");
} // end of else clause - client voted before
// end of else (there was a vote)
// Finish response document and close the stream
out.println("</body> </html>");
out.close();
}
//** end of ProcessRequest
//----------------------------------------------------------------// Method votedBefore - return true if the client voted before;
// false otherwise
boolean votedBefore() {
if (cookies == null || cookies.length == 0) {
return false;
} else {
}
// Check the cookies to see if this user voted before
for (index = 0; index < cookies.length; index++) {
if (cookies[index].getName().equals("iVoted")) {
return true;
}
} // end of for (index = 0; ...
return false;
} //** end of if (cookies == null ...
//** end of votedBefore
//----------------------------------------------------------------// Method makeHeader - get the writer and produce the
// response header
void makeHeader(HttpServletResponse response)
throws IOException {
// Set content type for response and get a writer
response.setContentType("text/html");
out = response.getWriter();
}
// Write the response document head and the message
out.println("<html><head>");
out.println(
"<title> Return message </title></head><body>");
//** end of makeHeader
// Method doPost - just calls processRequest
protected void doPost(HttpServletRequest request,
62
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}
//** end of VoteCounter2
Chapter 12
Exercise 12.1
<!-- e121.aspx
A solution to Exercise 12.1
-->
<%@ Page language="c#" %>
<html xmlns = "http://www.w3.org/1999/xhtml">
<head> <title> Exercise 12.1 </title>
</head>
<body>
<h3> Days, hours, and minutes in my life </h3>
<%
string msg, days, hours, minutes;
DateTime rightnow, birthdate;
TimeSpan timeSpan;
// Set date/time of right now and new years day
rightnow = DateTime.Now;
birthdate = new DateTime(1989, 2, 19);
// Compute the difference in time/dates
timeSpan = rightnow.Subtract(birthdate);
// Compute and display the differences in days, hours, and minutes
days = timeSpan.Days.ToString();
msg = string.Format("Days: {0}, ", days);
Response.Write(msg);
hours = timeSpan.Hours.ToString();
msg = string.Format("Hours: {0}, ", hours);
Response.Write(msg);
minutes = timeSpan.Minutes.ToString();
msg = string.Format("Minutes: {0} <br />", minutes);
Response.Write(msg);
%>
</body>
</html>
Exercise 12.3
<!-- e123.aspx
A solution to Exercise 12.3
63
-->
<%@ Page language="c#" %>
<html>
<head> <title> Exercise 12.3 </title>
</head>
<body>
<form runat = "server">
<p>
Your name:
<asp:textbox id = "name" runat = "server" />
<br />
Your age:
<asp:textbox id = "age" runat = "server" />
<br />
Your marital status:
<asp:RadioButtonList id = "mStatus" runat = "server" >
<asp:ListItem Text = "Single" value = "single" />
<asp:ListItem Text = "Married" value = "married" />
<asp:ListItem Text = "Divorced" value = "divorced" />
<asp:ListItem Text = "Widowed" value = "widowed" />
</asp:RadioButtonList>
<br />
<asp:button id = "submit" runat = "server"
value = "Submit" text = "Submit" />
<br />
<% if (IsPostBack) { %>
Hello <%= name.Text %> <br />
You are <%= age.Text %> years old
and you are <%= mStatus.SelectedItem.Value %> <br />
<% } %>
</p>
</form>
</body>
</html>
Exercise 12.5
<!-- e125.aspx
A solution to Exercise 12.5
-->
<%@ Page language="c#" %>
<html>
<head> <title> Exercise 12.5 </title>
</head>
<body>
<form runat = "server">
<p>
Your name:
<asp:TextBox id = "name" runat = "server" />
<asp:RequiredFieldValidator
ControlToValidate = "name"
Display = "Static"
64
runat = "server"
ErrorMessage = "Please enter your name">
</asp:RequiredFieldValidator>
<br />
Your address:
<asp:TextBox id = "address" runat = "server" />
<asp:RegularExpressionValidator
ControlToValidate = "address"
Display = "Static"
runat = "server"
ErrorMessage = "Address must begin with a number"
ValidationExpression = "\d+ [A-Z][a-z]*">
</asp:RegularExpressionValidator>
<br />
Your phone number:
<asp:TextBox id = "phone" runat = "server" />
<asp:RegularExpressionValidator
ControlToValidate = "phone"
Display = "Static"
runat = "server"
ErrorMessage = "Phone number form must be ddd-ddd-dddd"
ValidationExpression = "\d{3}-\d{3}-\d{4}">
</asp:RegularExpressionValidator>
<br />
Your age:
<asp:TextBox id = "age" runat = "server" />
<asp:RangeValidator
ControlToValidate = "age"
Display = "Static"
runat = "server"
MaximumValue = "110"
MinimumValue = "10"
Type = "Integer"
ErrorMessage = "Age must be in the range of 10 to 110">
</asp:RangeValidator>
<br />
Your Social Security number:
<asp:TextBox id = "ssn" runat = "server" />
<asp:RegularExpressionValidator
ControlToValidate = "ssn"
Display = "Static"
runat = "server"
ErrorMessage =
"Social security number must have the form: ddd-dd-dddd"
ValidationExpression = "\d{3}-\d{2}-\d{4}">
</asp:RegularExpressionValidator>
<br />
<input type = "submit"
</p>
</form>
</body>
</html>
value = "Submit" />
65
Chapter 13
Exercise 13.2
No changes to access_cars.php are required to handle UPDATE and INSERT SQL
commands. The mysql_query function takes SQL commands as its parameter, whether
they are queries, updates, or inserts. For example, we could have:
$query =
"INSERT INTO Corvettes VALUES (38, ′convertible′, 17.1, 1993, 15)";
$result = mysql_query($query);
To determine the number of rows that were affected by the INSERT command, the
mysql_affected_rows function is used (with the result as its parameter).
Exercise 13.3
// e13_3.java
// This servlet receives
//
connects to the cars
//
the database. If the
//
table of the results
// This is a solution to
import
import
import
import
import
an SQL command from its HTML document,
database, and performs the command on
command was a query, it returns an HTML
of the query
Exercise 13.3
javax.servlet.*;
javax.servlet.http.*;
java.io.*;
java.util.*;
java.sql.*;
public class e13_3 extends HttpServlet {
private Connection myCon;
private Statement myStmt;
// The init method - instantiate the db driver, connect to the
// db, and create a statement for an SQL command
public void init() {
// Instantiate the driver for MySQL
try {
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
}
catch (Exception e) {
e.printStackTrace();
}
// Create the connection to the cars db
66
try {
myCon = DriverManager.getConnection (
"jdbc:mysql://localhost/cars?user=root");
}
catch (SQLException e) {
e.printStackTrace();
}
// Create the statement for SQL queries
try {
myStmt = myCon.createStatement();
}
catch (Exception e) {
e.printStackTrace();
}
} //** end of the init method
// The doPost method - get the query, perform it, and produce
// an HTML table of the results
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
ResultSet result;
String command, colName, dat;
int numCols, index;
ResultSetMetaData resultMd;
// Get the SQL command
command = request.getParameter("Command");
// Set the MIME type and get a writer
response.setContentType("text/html");
PrintWriter out = response.getWriter();
// Create the initial html and display the request
out.println("<html>");
out.println("<head><title>JDBCServlet</title></head>");
out.println("<body>");
out.print("<p><b>The command is: </b>" + command + "</p>");
// If the command is a query, use executeQuery on it
if (command.substring(0, 5).equalsIgnoreCase("SELECT")) {
try {
result = myStmt.executeQuery(command);
// Get the result's metadata and the number of result rows
resultMd = result.getMetaData();
numCols = resultMd.getColumnCount();
67
// Produce the table header and caption
out.println("<table border>");
out.println("<caption> <b> Query Results </b> </caption>");
out.println("<tr>");
// Loop to produce the column headings
for (index = 1; index <= numCols; index++) {
colName = resultMd.getColumnLabel(index);
out.print("<th>" + colName + "</th>");
}
out.println("</tr>");
// Loop to produce the rows of the result
while (result.next()) {
out.println("<tr>");
// Loop to produce the data of a row of the result
for (index = 1; index <= numCols; index++) {
dat = result.getString(index);
out.println("<td>" + dat + "</td>");
} //** end of for (index = 0; ...
}
out.println("</tr>");
//** end of while (result.next()) ...
out.println("</table>");
}
//** end of try
catch (Exception e) {
e.printStackTrace();
} //** end of catch
} //** end of the then clause of if (command.substring...
else { //** It is a non-query command
try {
myStmt.executeUpdate(command);
}
catch (Exception e) {
e.printStackTrace();
}
} //** end of else clause of if (command.substring...
}
}
out.println("</body></html>");
//** end of doPost method
//** end of class e13_3
Chapter 14
68
Exercise 14.1
# e141.rb - A solution to Exercise 14.1
# Get input
puts "Please type the three input numbers"
a = gets.to_i
b = gets.to_i
c = gets.to_i
# Compute result
result = 10 * a * b - ((c - 1) / 17.44)
# Display the result
puts "The result is: #{result}"
Exercise 14.3
# e143.rb - A solution to Exercise 14.3
# Get input
puts "Please type the three names, on separate lines"
name1 = gets
name2 = gets
name3 = gets
# Pass one - compare/interchange both pairs
if name2 < name1
temp = name1
name1 = name2
name2 = temp
end
if name3 < name2
temp = name2
name2 = name3
name3 = temp
end
# Pass two - compare/interchange the first two
if name2 < name1
temp = name1
name1 = name2
name2 = temp
end
# Display results
puts "The names in order are: \n #{name1} #{name2} #{name3}"
Exercise 14.5
# e145.rb - A solution to Exercise 14.5
# Create the two arrays
pos_list = Array.new
neg_list = Array.new
69
# Loop to read input and build the two new arrays
while next_one = gets
next_one = next_one.to_i
# If the number is positive, put it in the positive array
if next_one > 0
pos_list.push(next_one)
elsif next_one < 0
neg_list.push(next_one)
end
end
# Display resulting arrays
puts "The positive array is:"
for value in pos_list
puts value
end
puts "The negative array is:"
for value in neg_list
puts value
end
Chapter 15
Exercise 15.5
class AdderController < ApplicationController
def the_form
end
# result method - fetch data and compute the sum
def result
# Fetch the form values
@first = params[:first].to_i
@second = params[:second].to_i
# Compute the sum
@sum = @first + @second
end
end
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- the_form.html.erb - the initial template for e155
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> The initial template for Exercise 15.5 </title>
</head>
70
<body>
<h2> Please input two integers </h2>
<form action = result method = "post">
<label> <input type = "text" name = "first"
size = "5" />
First number
</label>
<br />
<label> <input type = "text" name = "second"
size = "5" />
Second number
</label>
<br /> <br />
<input type = "submit" value = "Submit data" />
<br />
<input type = "reset" value = "Clear form" />
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- result.html.erb - the template for the result of e155
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> The result template for Exercise 15.5 </title>
</head>
<body>
<p> The sum of your input is: <%= @sum %> </p>
</body>
</html>
Exercise 15.6
# main_controller.rb - for the fbplayers application
# Exercise 15.6
class MainController < ApplicationController
# welcome method - the initial view
def welcome
end
# result method - fetches values for the result view
def result
@age1 = params[:age1]
@age2 = params[:age2]
@team = params[:team]
@selected_players = Player.find(:all, :conditions =>
["age >= ? and age <= ? and team = ?",
@age1, @age2, @team])
end
71
end
<!-- welcome.html.erb - initial view for the fbplayers application
(Exercise 15.6)
-->
<!-- The form to collect input from the user about their interests -->
<form action = "result" method = "post" >
<span class = "labels"> From age: </span>
<input type = "text" size = "4" name = "age1" />
<span class = "labels"> To age: </span>
<input type = "text" size = "4" name = "age2" />
<span class = "labels"> Team: </span>
<input type = "text" size = "12" name = "team" />
<br />
<input type = "submit" value = "Submit request" /> <br />
<input type = "reset" value = "Reset form" /> <br />
</form>
<!-- result.html.erb - the result of the user request for
information about players (Exercise 15.6)
-->
<p>
<!-- Display what the user asked for -->
Players aged from <%= @age1 %> to <%= @age2 %>
with the <%= @team %> team
</p>
<!-- Display the results of the request in a table -->
<table border = "border">
<tr>
<th> Player </th>
<th> Age </th>
</tr>
<!-- Put the cars in @selected_players in the table -->
<% @selected_players.each do |player| %>
<tr>
<td> <%= player.name %> </td>
<td> <%= player.age %> </td>
</tr>
<% end %> <!-- end of do loop -->
</table>
Appendix C
Exercise C.1
<?xml version = "1.0"
encoding = "utf-8"?>
72
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- ec_1.html
To test the applet, ec_1.java
Solution to Exercise 7.1
Legal styles are BOLD, PLAIN, and ITALIC
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Test ec_1.java </title>
</head>
<body>
<p>
<object codetype = "application/java"
code = "ec_1.class"
width = "600"
height = "100">
<param name = "size"
value = "35" />
<param name = "font"
value = "Courier" />
<param name = "style"
value = "ITALIC" />
</object>
</p>
</body>
</html>
/* ec_1.java
An applet to illustrate parameters
*/
import java.applet.*;
import javax.swing.*;
import java.awt.*;
// The panel class on which the message will be painted
class MessagePanel2 extends JPanel {
Font myFont = new Font(ec_1.myFont, ec_1.myStyle,
ec_1.mySize);
public void paintComponent(Graphics grafObj) {
super.paintComponent(grafObj);
grafObj.setFont(myFont);
grafObj.drawString("Welcome to my home page!", 50, 50);
}
}
// The ec_1 applet
public class ec_1 extends JApplet {
static int mySize, myStyle;
static String myFont;
public void init() {
Container messageArea = getContentPane();
73
String pString;
// Get the fontsize parameter
pString = getParameter("size");
// If it's null, set the size to 30, otherwise
// use the parameter value
if (pString == null)
mySize = 30;
else mySize = Integer.parseInt(pString);
// Get the font parameter
pString = getParameter("font");
// If it's null, set the font to 'Times Roman',
// otherwise, use the parameter value
if (pString == null)
else myFont = pString;
// Get the font style parameter
pString = getParameter("style");
// If it's null, set the font to PLAIN, otherwise
// use the parameter value
if (pString == null)
myStyle = Font.PLAIN;
else if (pString.equals("BOLD"))
myStyle = Font.BOLD;
else if (pString.equals("ITALIC"))
myStyle = Font.ITALIC;
// Instantiate the panel with the message and add it to
// the content pane
MessagePanel2 myMessagePanel = new MessagePanel2();
messageArea.add(myMessagePanel);
}
}
Exercise c.3
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- ec_3.html
To test the applet, Olympic
74
A solution to Exercise c.3
-->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title> Test Olympic </title>
</head>
<body>
<p>
<object codetype = "application/java"
code = "Olympic.class"
width = "460"
height = "180">
</object>
</p>
</body>
</html>
/* Olympic.java
A solution to Exercise c.3 - the applet
*/
import java.applet.*;
import java.awt.*;
import javax.swing.*;
// The panel class for drawing
class MyPanel extends JPanel {
public void paint(Graphics grafObj) {
Font myFont = new Font("TimesRoman", Font.ITALIC, 24);
super.paintComponent(grafObj);
grafObj.setColor(Color.green);
grafObj.drawRect(10, 10, 440, 120);
grafObj.setColor(Color.blue);
grafObj.drawOval(20, 20, 100, 100);
grafObj.drawOval(100, 20, 100, 100);
grafObj.drawOval(180, 20, 100, 100);
grafObj.drawOval(260, 20, 100, 100);
grafObj.drawOval(340, 20, 100, 100);
grafObj.setColor(Color.red);
grafObj.setFont(myFont);
grafObj.drawString("United States Olympic Committee", 60, 160);
}
}
// The Olympic applet
public class Olympic extends JApplet {
Container olympicArea = getContentPane();
MyPanel newPanel = new MyPanel();
// The init method for the applet - adds the panel
// to the content area of the applet
public void init() {
olympicArea.add(newPanel);
75
}
}
Exercise c.4
/* Mexfood.java
A solution to Exercise c.4
*/
import java.awt.*;
import java.applet.*;
import javax.swing.*;
public class Mexfood extends JApplet {
// Create a content pane
Container contentPane = getContentPane();
// The init method, which does everything in this applet
public void init() {
// Create a panel object and set its layout manager to put
// the components in a column
JPanel myPanel = new JPanel();
myPanel.setLayout(new GridLayout(4, 3, 10, 10));
myPanel.setBackground(Color.cyan);
// Create checkboxes and textboxes for the different food items
// and add them to the panel
TextField t1 = new TextField(2);
TextField t2 = new TextField(2);
TextField t3 = new TextField(2);
TextField t4 = new TextField(2);
JLabel l1 = new JLabel("Tacos
JLabel l2 = new JLabel("Chalupas
JLabel l3 = new JLabel("Burritos
JLabel l4 = new JLabel("Nachos
myPanel.add(l1);
myPanel.add(t1);
myPanel.add(l2);
myPanel.add(t2);
myPanel.add(l3);
myPanel.add(t3);
myPanel.add(l4);
myPanel.add(t4);
Quantity:");
Quantity:");
Quantity:");
Quantity:");
// Now add the panel
contentPane.add(myPanel);
} // End of init()
} // End of Mexfood applet
76
Exercise c.5
/* FoodCost.java
A solution to Exercise c.5
*/
import
import
import
import
java.awt.*;
java.awt.event.*;
java.applet.*;
javax.swing.*;
// The applet
public class FoodCost extends JApplet implements ActionListener {
private JPanel myPanel = new JPanel();
private JTextField t1, t2, t3, t4, t5;
private JLabel l1, l2, l3, l4, l5;
private double totalCost = 0.0;
Container contentPane = getContentPane();
public void init() {
// Create a panel object and set its layout manager to put
// the components in a column
myPanel.setLayout(new GridLayout(5, 2, 10, 10));
myPanel.setBackground(Color.cyan);
// Create checkboxes and textboxes for the different food items
// and add them to the panel
l1
l2
l3
l4
l5
t1
t2
t3
t4
t5
=
=
=
=
=
=
=
=
=
=
new
new
new
new
new
new
new
new
new
new
JLabel("Tacos
JLabel("Chalupas
JLabel("Burritos
JLabel("Nachos
JLabel("Total Cost:");
JTextField(2);
JTextField(2);
JTextField(2);
JTextField(2);
JTextField(6);
Quantity:");
Quantity:");
Quantity:");
Quantity:");
myPanel.add(l1);
myPanel.add(t1);
myPanel.add(l2);
myPanel.add(t2);
myPanel.add(l3);
myPanel.add(t3);
myPanel.add(l4);
myPanel.add(t4);
myPanel.add(l5);
myPanel.add(t5);
77
// Register the event handler
t1.addActionListener(this);
t2.addActionListener(this);
t3.addActionListener(this);
t4.addActionListener(this);
// Now add the panel
contentPane.add(myPanel);
}
// End of init()
// The event handler
public void actionPerformed(ActionEvent e) {
// Determine which textbox has been changed and add the cost
int quantity;
Object source = e.getSource();
if (source == t1) {
quantity = Integer.parseInt(t1.getText());
totalCost = totalCost + quantity * 0.79;
} else if (source == t2) {
quantity = Integer.parseInt(t2.getText());
totalCost = totalCost + quantity * 1.19;
} else if (source == t3) {
quantity = Integer.parseInt(t3.getText());
totalCost = totalCost + quantity * 1.39;
} else if (source == t4) {
quantity = Integer.parseInt(t4.getText());
totalCost = totalCost + quantity * 1.29;
}
String cost = Double.toString(totalCost);
t5.setText("$" + cost);
repaint();
}
//* end of method ActionEvent
} // End of Mexfood applet
78