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Specifying a base URL

From: XHTML and HTML Essential Training

Video: Specifying a base URL

So, in our last lesson, we learned about relative URLs and in this lesson we're going to talk about how you can change the base of the relative URL. In other words, we learned that relative URLs are relative to the location of the document that has a link in it. But you can actually change that by using the base tag. The base tag goes in the head section and here is the base tag here and all this does is it specifies a location that all the URLs in this document are going to be relative to and again this file is available on my web server.

Specifying a base URL

So, in our last lesson, we learned about relative URLs and in this lesson we're going to talk about how you can change the base of the relative URL. In other words, we learned that relative URLs are relative to the location of the document that has a link in it. But you can actually change that by using the base tag. The base tag goes in the head section and here is the base tag here and all this does is it specifies a location that all the URLs in this document are going to be relative to and again this file is available on my web server.

I'm actually using a local copy of it, because it can illustrate the same point. You'll notice in the browser here that this file is on my local machine at a file URL. Yet when I hover my mouse over this link, you'll see at that bottom. It's a link on the server and yet if you look at it in the text editor that this link, it doesn't have that whole http part of it. That's in the base and so it takes this and it uses this as the base for the relative URL and so this relative URL will start with the xhtml-links/another directory.

Let's look at that again in the browser, and we see in the bottom in the Status bar down there that it shows that URL relative to the base URL at the top of the document. I'll go ahead, and I'll click on it and you'll see that the location bar in the browser will change and it will have that location on my web server. So, I went ahead and loaded this off of the web server, http://bw.org/misc/xhtml-links/another /yet.another.html and when I click on this link, it will actually take me back to the version of it that's on my server there.

But it's the same file with that base URL. So that's how the base URL works. It changes the base from which the browser will construct URLs based on a relative URL. So this relative URL is no longer relative to the location of this file, instead it's relative to this base URL that we've specified in the base tag, in the head element.

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This video is part of

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XHTML and HTML Essential Training

59 video lessons · 80995 viewers

Bill Weinman
Author

 
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  1. 5m 10s
    1. Welcome
      1m 16s
    2. Using the exercise files
      1m 23s
    3. Choosing a text editor
      2m 31s
  2. 15m 46s
    1. Introducing HTML and XHTML
      2m 53s
    2. Understanding versions of HTML and XHTML
      2m 25s
    3. Exploring a simple XHTML page
      4m 47s
    4. Understanding the structure of an XHTML document
      2m 58s
    5. Understanding document containers
      54s
    6. Creating and using templates
      1m 49s
  3. 42m 4s
    1. Understanding how empty space is formatted in XHTML
      2m 42s
    2. Using paragraph tags
      2m 42s
    3. Aligning paragraphs
      2m 49s
    4. Understanding block-level and inline tags
      1m 24s
    5. Controlling line breaks and spaces
      5m 43s
    6. Formatting text with phrase element tags
      3m 28s
    7. Formatting text with font markup elements
      3m 24s
    8. Adding document structure with headings
      3m 25s
    9. Formatting quotations and quote marks
      2m 19s
    10. Preserving pre-formatted text
      1m 30s
    11. Selecting a typeface
      4m 33s
    12. Selecting a type size
      2m 11s
    13. Using ordered and unordered lists
      5m 54s
  4. 7m 48s
    1. Using inline images
      3m 17s
    2. Flowing text around an image
      2m 4s
    3. Breaking lines around an image
      2m 27s
  5. 22m 34s
    1. Working with hyperlinks
      7m 46s
    2. Using relative URLs
      3m 5s
    3. Specifying a base URL
      2m 4s
    4. Linking within a page using fragments
      4m 28s
    5. Creating image links
      5m 11s
  6. 22m 56s
    1. Introducing tables
      4m 37s
    2. Formatting tables with CSS
      8m 50s
    3. Aligning images with tables
      5m 7s
    4. Reviewing an alternative solution using CSS
      4m 22s
  7. 14m 31s
    1. Introducing frames
      7m 56s
    2. Hiding frame borders
      3m 15s
    3. Creating inline frames using iFrame
      3m 20s
  8. 20m 50s
    1. Introducing forms: part 1
      10m 37s
    2. Introducing forms: part 2
      7m 45s
    3. Using CGI with forms
      2m 28s
  9. 25m 42s
    1. Introducing CSS
      3m 11s
    2. Understanding levels of inheritance
      6m 10s
    3. Learning CSS syntax
      11m 23s
    4. Using units of measure in CSS
      4m 58s
  10. 1h 45m
    1. Comparing table layout and CSS layout
      1m 25s
    2. Exploring the finished web site
      2m 37s
    3. Building a document header
      8m 18s
    4. Placing a banner and a contact button
      8m 13s
    5. Laying out a main menu
      6m 55s
    6. Creating a layout template: main body area
      13m 31s
    7. Creating a layout template: sidebar area
      5m 17s
    8. Creating a layout template: footer content
      4m 46s
    9. Building a main home page: main body content
      11m 24s
    10. Building a main home page: sidebar content
      8m 52s
    11. Creating a page with a menu, graphics, and formatted links
      13m 26s
    12. Creating a page containing an ordered list
      6m 44s
    13. Creating a page containing video
      10m 45s
    14. Touring the finished site
      3m 45s
  11. 53s
    1. Goodbye
      53s

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