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Dynamic HTML #3: Hypertext and Links and Images

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أستاذ المادة حيدر محمد حبيب الخميس       15/10/2012 16:23:47
Understand Hypertext and Links
Why did the arrival of hypertext links make such a difference? You can understand it better by comparing the Internet to a vast library. What if you went into a library and discovered that the only way you could find anything was by going through multiple lists of items, each one becoming a little more specific, until you narrowed your search down to the information you were looking for? Then, when you found the book you wanted, you had to access the information in it, page by page, until you found what you needed? Thankfully, libraries don’t work that way.
The development of HTML and the creation of the World Wide Web made it possible to go right to the document you want, and a lot more. Because pages are linked together, it is possible to go to the specific page you want. Even better, assuming a link is provided, it is possible to go to a precise location on the page you are looking for. And with all those pages linked together around the world…well, you see where the term “web” comes from. And it’s all possible because of hypertext.

Understand URLs
What is hypertext? Even if you’ve never been on the Web, you’ve probably used hypertext before. Often the “help” files of computer programs use hypertext to help you find the answer to your question quickly. Computerized encyclopedias are another place you’ve probably encountered hypertext. The articles in such encyclopedias and dictionaries generally have related subjects listed at the bottom.
If you click on the subject, you are instantly transported to another article for more information. That’s hypertext at work. To understand how to use it on the Web, you must learn a little about uniform resource locators (URLs). URLs are more commonly known as Web addresses, Internet addresses.
A URL is made up of several parts, each of which helps identify a specific location where a resource can be found (or sent). For instance, if you want to visit University of Babylon Web site, the address would be http://www.uobabylon.edu.iq/. The first part of the address is the protocol, usually http://. This stands for Hypertext Transfer Protocol, the specification for transferring documents using hypertext links or hyperlinks. As you’ll see in the following, there are other protocols, depending on what you are trying to do on the Net; but the primary one for the Web is http://. When an Internet server sees http:// at the beginning of an address, it knows to expect an HTML document.
The next portion of a URL identifies the host (also called a server). In the case of university of Babylon address, the host portion is www.uobabylon.edu.iq. The host is the system where the file or document you are looking for can be found, or where it is to be sent.
You probably are more familiar with the term domain name, as in www.domainname.com. When you type in a domain name, it is translated into what is known as an IP address, which numerically describes the exact location of the server that hosts that particular Web site.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .