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Building a
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Define
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Web design
Write for the Web
Balance content & presentation
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Summary
Further reading
Deliver
1. Naming conventions
2. Color and Graphics
3. Relative Links
4. Finding a Web Host
5. Keep it Simple

Directories

This page serves three purposes:

  1. It explains the terms directories, subdirectories and folders.
  2. It gives you an example of how to set up directories and subdirectories on your own system so that uploading will be as easy as possible.
  3. It discusses how HTML paths should be constructed.

What are directories and subdirectories?

All operating systems use some form of structure for holding and organizing data files and applications. The terminology varies. If you use the Mac OS or Win95 you probably are used to speaking in terms of "Folders." If you are a Unix, Linux or DOS user then you speak in terms of "directories."

Many servers runs the Unix operating system, so it will help to have an idea of what is meant by a directory or a subdirectory.

If you are used to the term "folder" than here's the rule:

  • A "directory" is a folder
  • A "subdirectory" is a directory inside of a directory, a "folder" inside of a "folder."

Creating a Work Space on your Machine

In order to make uploading as easy as possible, and to make sure that your links work once your web project has been uploaded, you should create a "work space" on your computer that will help you organize your Web project. Ask your network administrator if there are any requirements about your Web server that you should know about. For instance, your server may expect to see a "cgi-bin" directory in your workspace.

Let's look at an example of a typical Macintosh set up.
Note! Windows and Windows95 users - this applies to you too!

macsm.gif (2572 bytes) To the left we have a folder which we have set up for our Web project that has four folders that will contain various kinds of files. For instance, in our example
  • /cgi-bin contains CGI files
  • /data will contain the primary Web pages
  • /media will contain all sound, image, and multimedia files.

Notice that the folder names are typed exactly as they will appear on the server. They are all in lowercase and have no spaces - notice we have written cgi-bin and NOT "cgi bin"

 

winsm2.gif (2829 bytes) Here is the corresponding Windows Work Space.

Notice that all of the file and folder names are in UPPERCASE. (Win32 users will not have this problem).
Even though the file and directory names are listed in UPPERCASE, you should write your HTML code as if your directory names were in lowercase. DOS will not mind since DOS is not case sensitive, however - the ThinkQuest server will!

Unix Servers

Many servers run UNIX which, unlike DOS, is case sensitive.

Therefore, if you write HTML code with paths such as
<img src="MEDIA/TEAM.GIF">Our Team!</a> and your directories are named with lower case letters, e.g., /media, the server will complain - "File Not Found!" This is because the link in your src statement is written in upper case letters, which does not match the lower case directory name.

Note keeping the file name TEAM.GIF is not a problem since you will be uploading your own files to the server - the problem is only with the case of the existing directories:
cgi-bin, data, gather, and media.

maclrg.gif (3479 bytes) Now we see the Macintosh workspace in expanded form. Notice that specific files have been saved in the correct places. The cgi's are in the cgi-bin folder, a data file (possibly used to store information that will be retrieved by a cgi) is in the data folder, a guestbook (written to by a cgi) is in the gather folder, and a gif image is in the media folder.

Subdirectories and HTML paths

In the real world Paths explain how to get from one place to another. For example, to get from your house to the store you might describe the path as "Go out the front door, turn right, go 3 blocks, turn right at Maple Street, go one block, turn left on Elm Street and the store is at 2345 Elm."
In the same way, a path tell the computer's operating system how to get from one file to another.

When you create links from one page to another you need to tell the machine the path to the page. In general the syntax for creating a link is <a href = "path_goes here">Name of Link</a>

There are two kinds of paths, Relative and Absolute. Absolute paths should generally only be used to create links to outside pages (pages not on the same server as your web project).


For example, to link from this page to the Global Schoolhouse
Home Page, I would use an absolute path like this:
<a href="http://www.gsn.org">Global Schoolhouse
</a>

To link to any of my own team's files I should use relative paths. A relative path explains how to get from one of your pages to another file on the server. Use of relative paths makes your web project "portable" - this means it will run on your machine, the ThinkQuest server, and any other server as long as all the files are kept in the same places.


Looking at our sample, let's say we want to create a link from index.html to elements.html, the HTML code would be
<a href="elements.html">Elements!</a>

So far so good, now let's look at a more difficult example.
Let's say that from index.html we want to include the image of the Earth (globe.gif) that is in the media directory. Well, for one we will be using the "image" tag instead of the "a href" but the important thing to notice is the PATH, let's look:
<img src="media/globe.gif" alt="picture of Earth" width=72 height=72 >


The path is included in src="media/globe.gif" which tells the server to go the media directory and to look inside and find globe.gif. If we would have used src="globe.gif" the image would not show up, because the server would be looking in the top level directory for globe.gif.

So, the general rule for moving down a directory is to use "directory_name/filename"

You want to go down two directories? No problem, use "directory1_name/directory2_name/filename"

Let's try another!
This time, suppose that in our file addguest.cgi we want to create a link to index.html This means that we need to go UP a directory. The correct link is
<a href="../index.html">Home!</a>

The general rule for going UP a directory is to use "../filename"
Want to go up two directories? no problem! use "../../filename"

Let's try one more. In this example we will go up AND down. Let's say that from addguest.cgi we need to get to guestbook (see one of the screen shots above to recall where these files are located).
The link would look as follows

<a href="../gather/guestbook">GuestBook</a>

In summary:

  1. Create a ThinkQuest workspace on your local machine that mirrors the directory structure of the server.
  2. Use Absolute paths to link to sites not on the server, use Relative paths to link to your own pages.
  3. Follow the general rules above for creating links to files in various subdirectories. Good Luck

Page 1: Naming conventions
Page 2: Color and Graphics
Page 3: Relative Links
Page 4: Finding a Web Host
Page 5: Keep it Simple

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