w5sols

Instructor's Resource Manual

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Programming the World Wide Web

Fifth Edition

R.W. Sebesta

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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.

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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).

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

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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.

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.

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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.

Table of Contents

1 Fundamentals 1

1.1 A Brief Introduction to the Internet 21.2 The World Wide Web 61.3 Web Browsers 71.4 Web Servers 81.5 Uniform Resource Locators 111.6 Multipurpose Internet Mail Extensions 131.7 The Hypertext Transfer Protocol 151.8 Security 181.9 The Web Programmer’s Toolbox 20

Summary 28Review Questions 30Exercises 32

2 Introduction to XHTML 35

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2.1 Origins and Evolution of HTML and XHTML 362.2 Basic Syntax 382.3 Standard XHTML Document Structure 392.4Basic Text Markup 402.5 Images 492.6 Hypertext Links 542.7 Lists 572.8 Tables 632.9 Forms 712.10 Syntactic Differences between HTML and XHTML 84


3 Cascading Style Sheets 91

3.1 Introduction 923.2 Levels of Style Sheets 933.3 Style Specification Formats 943.4 Selector Forms 963.5 Property Value Forms 993.6 Font Properties 1003.7 List Properties 1063.8 Color 1103.9 Alignment of Text 1123.10 The Box Model 1143.11 Background Images 1193.12 The <span> and <div> Tags 1213.13Conflict Resolution 122


4 The Basics of JavaScript 129

4.1 Overview of JavaScript 1304.2 Object Orientation and JavaScript 1334.3 General Syntactic Characteristics 1344.4 Primitives, Operations, and Expressions 1374.5 Screen Output and Keyboard Input 1464.6 Control Statements 1504.7 Object Creation and Modification 1584.8 Arrays 1594.9 Functions 1644.10 An Example 1694.11 Constructors 1704.12Pattern Matching Using Regular Expressions 1714.13Another Example 1764.14 Errors in Scripts 177

Summary 179Review Questions 181

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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 1985.6 Handling Events from Button Elements 1995.7 Handling Events from Text Box and Password Elements 2055.8The DOM 2 Event Model 2155.9 The navigator Object 2205.10 DOM Tree Traversal and Modification 222


6 Dynamic Documents with JavaScript 227

6.1 Introduction 2286.2 Positioning Elements 2286.3 Moving Elements 2346.4 Element Visibility 2376.5 Changing Colors and Fonts 2386.6 Dynamic Content 2426.7 Stacking Elements 2456.8 Locating the Mouse Cursor 2486.9 Reacting to a Mouse Click 2516.10 Slow Movement of Elements 2526.11 Dragging and Dropping Elements 255


7 Introduction to XML 263

7.1 Introduction 2647.2 The Syntax of XML 2667.3 XML Document Structure 2697.4 Document Type Definitions 2707.5 Namespaces 2777.6 XML Schemas 2797.7 Displaying Raw XML Documents 2877.8 Displaying XML Documents with CSS 2897.9 XSLT Style Sheets 2917.10 XML Processors 3007.11 Web Services 302


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8 Introduction to Flash 309

8.1 Origins and Uses of Flash 3108.2 A First Look at the Flash Authoring Environment 3108.3 Drawing Tools 3158.4 An Example−Static Graphics 3228.5 An Example−Animation and Sound 3298.6 User Interactions 336


9 Introduction to PHP 345

9.1 Origins and Uses of PHP 3469.2 Overview of PHP 3469.3 General Syntactic Characteristics 3479.4 Primitives, Operations, and Expressions 3489.5 Output 3549.6 Control Statements 3569.7 Arrays 3599.8 Functions 3689.9 Pattern Matching 3719.10 Form Handling 3749.11 Files 3809.12 Cookies 3839.13 Session Tracking 386


10 Introduction to Ajax 393

10.1 Overview of Ajax 39410.2 The Basics of Ajax 39710.3 Return Document Forms 40710.4 Ajax Toolkits 41110.5 Security and Ajax 419

Summary 420Review Questions 421 Exercises 422

11 Java Web Software 423

11.1 Overview of Servlets 42411.2 The NetBeans Integrated Development Environment 42811.3 A Survey Example 43711.4 Storing Information on Clients 44411.5 Java Server Pages 45411.6 JavaBeans 46511.7 JavaServer Faces 470

Summary 479Review Questions 480

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Exercises 482

12 Introduction to ASP.NET 485

12.1 Overview of the .NET Framework 48612.2 A Bit of C# 48912.3 Introduction to ASP.NET 49312.4 ASP.NET Controls 50012.5 ASP.NET AJAX 51812.6 Web Services 525


13 Database Access through the Web 535

13.1 Relational Databases 53513.2 An Introduction to the Structured Query Language 53813.3 Architectures for Database Access 54313.4 The MySQL Database System 54613.5 Database Access with PHP and MySQL 54813.6 Database Access with JDBC and MySQL 557


14 Introduction to Ruby 569

14.1 Origins and Uses of Ruby 57014.2 Scalar Types and Their Operations 56214.3 Simple Input and Output 57914.4 Control Statements 58114.5 Fundamentals of Arrays 58614.6 Hashes 59214.7 Methods 59414.8 Classes 59814.9 Code Blocks and Iterators 60414.10 Pattern Matching 607


15 Introduction to Rails 613

15.1 Overview of Rails 61415.2 Document Requests 61615.3 Rails Applications with Databases 62315.5 Rails with Ajax 643


A Introduction to Java 655

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B Named Colors and Their Hexadecimal Values 671

C Java Applets 675

Index 703

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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">



<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




<html xmlns = "http://www.w3.org/1999/xhtml"><head><title> Exercise 2.3 </title></head><body><h2> Ruper B. Baggins </h2>

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<p>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>


<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 wayrelated to the famous (or is it infamous) adventurer, Bilbo.I have a lovely wife, Elvira, and two grown children, Maxand Miriam. Max has chosen to follow me in my profession,which is described below. Miriam is a beekeeper for the townbookkeeper, who keeps bees as a second job.</p><p>I am employed by Forest Keepers, Limited. My job, as I understandit, is to keep an eye on the 4 acres of wild cranberries thatgrow in the swamp at the edge of the village forest. I am requiredto file a daily report, in triplicate, on the condition of thecranberry bushes. To accomplish my task, I walk by and inspect every cranberry bush in the swamp every workday. My employer providesme 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

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<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


<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>

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</ol> </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


<html xmlns = "http://www.w3.org/1999/xhtml"><head><title> A simple table </title></head><body><table border = "border"><caption> Trees </caption> <tr>

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<th> </th> <th> Pine </th> <th> Maple </th> <th> Oak </th> <th> Fir </th> </tr> <tr> <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>

Exercise 2.10


<html xmlns = "http://www.w3.org/1999/xhtml">

<head><title> A simple table </title></head><body><table border = "border"><caption> Tree Characteristics </caption>

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<tr> <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'}

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Exercise 3.2


<html xmlns = "http://www.w3.org/1999/xhtml"><head><title> A Styled Table </title><style type = "text/css"> </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>

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<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


<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 likea 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

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<?xml version = "1.0"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<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>

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<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">

<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>

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Chapter 4

Exercise 4.1


<html xmlns = "http://www.w3.org/1999/xhtml"><head><title> Exercise 4.1 </title></head>

<body><script type = "text/javascript"></script></body></html>

Exercise 4.2



<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++) {

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next = first + second; document.write(count + " - " + next + "<br/>"); first = second; second = next; }// --></script></body></html>

Exercise 4.4




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


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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


<html xmlns = "http://www.w3.org/1999/xhtml"><head><title> Exercise 4.7 </title><script type = "text/javascript"></script></head>

<body>

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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"></script></body></html>

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) { var digit, position = 0;

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// 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"></script></body></html>

Chapter 5

Exercise 5.1


<html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> Exercise 5.1 </title> <script type = "text/javascript" src = "e51.js" > </script>

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</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 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;

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}}

Exercise 5.2


<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 // about the chosen color

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<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;}

function orangeHandler() {

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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


<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> </form> <script type = "text/javascript" src = "e552.js">

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</script> </body></html>

// e551.js -- The JavaScript part of the solution// to Exercise 5.5

var total = 0;


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(); return false; }

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else { total = total + number * 0.49; return true; }}



// 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


<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 </label> </p><p>

33

<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;


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"); var number = dom.value; if (number < dom.min || number > dom.max) {

34

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; }}



// 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


35

<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


36

<html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> Exercise 6.2 </title>




/* A style for the image */

.img {background-image: url(c172.gif); position: absolute; left: 100px; top: 150px; width: 100px}

</style> <script type = "text/javascript" src = "e62.js" > </script> </head> <body>

<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>

<p class = "regtext"> I was born on July 4th,

37

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


<html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> Exercise 6.3 </title>




</style>

38

<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


<html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> Exercise 6.5 </title> <style type = "text/css" > .planes {position: absolute; top: 100; left: 0; z-index: 0;" />

40

</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"?>

<!-- cars.dtd - a document type definition for the cars.xml document

41

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 accessories radio CDATA #REQUIRED><!ATTLIST accessories air_conditioning CDATA #REQUIRED>

<!ATTLIST accessories power_windows CDATA #REQUIRED> <!ATTLIST accessories power_steering CDATA #REQUIRED> <!ATTLIST accessories power_brakes CDATA #REQUIRED>

<!ENTITY c "Chevrolet"><!ENTITY f "Ford"><!ENTITY d "Dodge"><!ENTITY h "Honda"><!ENTITY n "Nisson"><!ENTITY t "Toyota">

Exercise 7.2

<?xml version = "1.0" encoding = "utf-8"?>



<!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" power_steering = "yes" power_brakes = "yes" />

42

</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



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

<?xml version = "1.0" encoding = "utf-8"?><!-- xslcar.xsl

43

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"?>

<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" /> <br /> <span style = "font-style: italic"> Fuel system: </span>

44

<xsl:value-of select = "engine/fuel_system" /> <br /> <span style = "font-style: italic"> Doors: </span> <xsl:value-of select = "number_of_doors" /> <br /><br /> </xsl:for-each>

</xsl:template>

</xsl:stylesheet>

Chapter 9

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


45

<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 $word) print "$tbl[$word] <br />";?></body>

46

</html>

Exercise 9.5


<!-- e9_5.php Use a function to find the first four-digit number in a given string.


// 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";


$result = first_four($test_str);

// If the returned value has four digits, display it

if ($result != 0) print("The first four-digit number is: $result <br />"); else print("There was no four-digit number in the string <br />");?>

47

</body></html>

Exercise 9.7


<!-- 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


// 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

if(in_array($word, $keys)) $freq[$word]++;

48

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?";


$tbl = the_three($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">

<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></html>

49

<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


<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 = "">



<table> <tr> <td> Buyer's Name: </td>

50

<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" alt = "picture of popcorn" /> <p /> 

<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// the request (with open), and send the request,// along with the name, to the server// includes: the anonymous handler for onreadystatechange,

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// 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

<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> <script type = "text/javascript" src = "e105.js"> </script> </head>

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<body> <h2> Welcome to Millenium Gynmastics Booster Club Popcorn Sales </h2>

<form action = "">



<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" alt = "picture of popcorn" /> <p /> 

<p> <input type = "submit" value = "Submit Order" /> <input type = "reset" value = "Clear Order Form" /> </p> </form> </body></html>

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// 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 : index (of the greet5 (Exercise 11.2) project) Created on : Mar 14, 2009, 8:23:49 PM Author : bob Purpose : 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> <form action = "Greet5" method = "get"> <p> Press the button to get a greeting

54

<input type = "submit" value = "Get greeting" /> </p> </form> </body></html>

/* Greet5 servlet (Exercise 11.2) */

import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import 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--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

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<!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" checked="checked" /> Other <br /> <br /> </label>

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<input type = "submit" value = "Submit Vote" /> <input type = "reset" value = "Clear Vote Form" /> </p> </form> </body></html>

/* e114 - Servlet for Exercise 11.4 */

import java.io.*;import java.net.*;import javax.servlet.*;import 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 // vote), create the votes array else { votes = new int[15];

57

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("%"); } else out.println(0);

58

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> <p> <input type="radio" name="vote1" value="Dogman" /> Daren Dogman <br />

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<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; String vote2; File votesdat2 = new File("votesdat2.dat"); String dogCandidates[] = {"Daren Dogman", "Timmy Taildragger",

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"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]++; if (vote2.equals("Catland")) votes[3]++;

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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) out.println(((100 * votes[index]) / sumCatVotes) + "% <br />"); else

62

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, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response);

63

}} //** end of VoteCounter2

Chapter 12

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


64

<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


<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" runat = "server" ErrorMessage = "Please enter your name"> </asp:RequiredFieldValidator>

65

<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" value = "Submit" /> </p> </form> </body></html>

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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 an SQL command from its HTML document,// connects to the cars database, and performs the command on // the database. If the command was a query, it returns an HTML// table of the results of the query// This is a solution to Exercise 13.3

import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;import 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

try { myCon = DriverManager.getConnection (

67

"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();

// Produce the table header and caption

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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

Exercise 14.1

69

# e141.rb - A solution to Exercise 14.1# Get inputputs "Please type the three input numbers"a = gets.to_ib = gets.to_ic = gets.to_i

# Compute resultresult = 10 * a * b - ((c - 1) / 17.44)

# Display the resultputs "The result is: #{result}"

Exercise 14.3

# e143.rb - A solution to Exercise 14.3# Get inputputs "Please type the three names, on separate lines"name1 = getsname2 = getsname3 = gets

# Pass one - compare/interchange both pairsif name2 < name1 temp = name1 name1 = name2 name2 = tempend

if name3 < name2 temp = name2 name2 = name3 name3 = tempend

# Pass two - compare/interchange the first twoif name2 < name1 temp = name1 name1 = name2 name2 = tempend

# Display resultsputs "The names in order are: \n #{name1} #{name2} #{name3}"

Exercise 14.5

# e145.rb - A solution to Exercise 14.5# Create the two arrayspos_list = Array.newneg_list = Array.new

# Loop to read input and build the two new arrayswhile next_one = gets

70

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) endend

# Display resulting arraysputs "The positive array is:"for value in pos_list puts valueend

puts "The negative array is:"for value in neg_list puts valueend

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">

<html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> The initial template for Exercise 15.5 </title> </head> <body> <h2> Please input two integers </h2>

71

<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">

<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 15.6class 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]) endend

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<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>

 <p>

 Players aged from <%= @age1 %> to <%= @age2 %> with the <%= @team %> team </p>

 <table border = "border"> <tr> <th> Player </th> <th> Age </th> </tr>

 <% @selected_players.each do |player| %> <tr> <td> <%= player.name %> </td> <td> <%= player.age %> </td> </tr> <% end %>  </table>

Appendix C

Exercise C.1


73

<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(); String pString;

// Get the fontsize parameter

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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


<html xmlns = "http://www.w3.org/1999/xhtml">

75

<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); } }

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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 Quantity:"); JLabel l2 = new JLabel("Chalupas Quantity:"); JLabel l3 = new JLabel("Burritos Quantity:"); JLabel l4 = new JLabel("Nachos 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);

// Now add the panel

contentPane.add(myPanel);

} // End of init()} // End of Mexfood applet

Exercise c.5

77

/* FoodCost.java A solution to Exercise c.5 */

import java.awt.*;import java.awt.event.*;import java.applet.*;import 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 = new JLabel("Tacos Quantity:"); l2 = new JLabel("Chalupas Quantity:"); l3 = new JLabel("Burritos Quantity:"); l4 = new JLabel("Nachos Quantity:"); l5 = new JLabel("Total Cost:"); t1 = new JTextField(2); t2 = new JTextField(2); t3 = new JTextField(2); t4 = new JTextField(2); t5 = new JTextField(6);

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);

// Register the event handler

t1.addActionListener(this);

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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

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