F.6. Linking

One of the most important XHTML features is the hyperlink, which references (or links to) other resources, such as XHTML documents and images. In XHTML, both text and images can act as hyperlinks. Web browsers typically underline text hyperlinks and color their text blue by default, so that users can distinguish hyperlinks from plain text. In Fig. F.5, we create text hyperlinks to four different Web sites.

Figure F.5. Linking to other Web pages.

 1  "1.0"?>
 2  "-//W3C//DTD XHTML 1.1//EN"
 3 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
"http://www.w3.org/1999/xhtml"> 9 10 Internet and WWW How to Program - Links 11 12 13 14 15

Here are my favorite sites

16 17

Click a name to go to that page.

18 19 20

<a href="</span">"http://www.deitel.com">Deitel</a>

21 22

<a href="</span">"http://www.prenhall.com">Prentice Hall</a>

23 24

<a href="</span">"http://www.yahoo.com">Yahoo!</a>

25 26

<a href="</span">"http://www.usatoday.com">USA Today</a>

27 28 29

Line 17 introduces the strong element. Browsers typically display such text in a bold font. Links are created using the a (anchor) element. Line 20 defines a hyperlink that links the text Deitel to the URL assigned to attribute HRef, which specifies the location of a linked resource, such as a Web page, a file or an e-mail address. This particular anchor element links to a Web page located at http://www.deitel.com. When a URL does not indicate a specific document on the Web site, the Web server returns a default Web page. This page is often called index.html; however, most Web servers can be configured to use any file as the default Web page for the site. (Open http://www.deitel.com in one browser window and http://www.deitel.com/index.html in a second browser window to confirm that they are identical.) If the Web server cannot locate a requested document, it returns an error indication to the Web browser, and the browser displays a Web page containing an error message to the user.

Anchors can link to e-mail addresses using a mailto: URL. When someone clicks this type of anchored link, most browsers launch the default e-mail program (e.g., Outlook Express) to enable the user to write an e-mail message to the linked address. Figure F.6 demonstrates this type of anchor. Lines 1719 contain an e-mail link. The form of an email anchor is <a href="mailto:</tt><span>emailaddress</span><tt>">...</a>. In this case, we link to the e-mail address deitel@deitel.com.

Figure F.6. Linking to an e-mail address.

 1  "1.0"?>
 2  "-//W3C//DTD XHTML 1.1//EN"
 3 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
"http://www.w3.org/1999/xhtml"> 9 10 Internet and WWW How to Program - Contact Page 11 12 13 14 15

16 My e-mail address is 17 <a href="</span"> "mailto:deitel@deitel.com"></a><a href="</span"> 18 deitel@deitel.com 19 </a> 20 . Click the address and your browser will 21 open an e-mail message and address it to me. 22

23 24

F 7 Images



    Introduction to Computers, the Internet and Visual C#

    Introduction to the Visual C# 2005 Express Edition IDE

    Introduction to C# Applications

    Introduction to Classes and Objects

    Control Statements: Part 1

    Control Statements: Part 2

    Methods: A Deeper Look


    Classes and Objects: A Deeper Look

    Object-Oriented Programming: Inheritance

    Polymorphism, Interfaces & Operator Overloading

    Exception Handling

    Graphical User Interface Concepts: Part 1

    Graphical User Interface Concepts: Part 2


    Strings, Characters and Regular Expressions

    Graphics and Multimedia

    Files and Streams

    Extensible Markup Language (XML)

    Database, SQL and ADO.NET

    ASP.NET 2.0, Web Forms and Web Controls

    Web Services

    Networking: Streams-Based Sockets and Datagrams

    Searching and Sorting

    Data Structures



    Appendix A. Operator Precedence Chart

    Appendix B. Number Systems

    Appendix C. Using the Visual Studio 2005 Debugger

    Appendix D. ASCII Character Set

    Appendix E. Unicode®

    Appendix F. Introduction to XHTML: Part 1

    Appendix G. Introduction to XHTML: Part 2

    Appendix H. HTML/XHTML Special Characters

    Appendix I. HTML/XHTML Colors

    Appendix J. ATM Case Study Code

    Appendix K. UML 2: Additional Diagram Types

    Appendix L. Simple Types


    Visual C# How to Program
    Visual C# 2005 How to Program (2nd Edition)
    ISBN: 0131525239
    EAN: 2147483647
    Year: 2004
    Pages: 600

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