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Mapping links in an image

From: HTML Essential Training

Video: Mapping links in an image

HTML provides a feature to define regions of an image as links to different URLs. This is called an image map. Let's make a working copy of imagemap.html. I am going to call this imagemap-working. I'll open this in my text editor and you can see it's a very small file. It just has an image and an image map, and we'll get into the details of this in a minute. Let's go ahead and open this in the browser, and you can see here's our scissors image and this one is a little bit different.

Mapping links in an image

HTML provides a feature to define regions of an image as links to different URLs. This is called an image map. Let's make a working copy of imagemap.html. I am going to call this imagemap-working. I'll open this in my text editor and you can see it's a very small file. It just has an image and an image map, and we'll get into the details of this in a minute. Let's go ahead and open this in the browser, and you can see here's our scissors image and this one is a little bit different.

And if you want to copy of this, it's in the images folder here if you have the exercise files; there's scissorsimagemap.png, and here is the original Photoshop file that I used to create this. And this has a couple of different regions. You'll notice that if I just put my cursor there, it says "Running with these is not recommended" like we expected. If I put my cursor over the square, I get one that says rectangular area. If I put my cursor over the circle and you'll notice that the cursor, the hot area is actually circular.

I put my cursor there. It says circular area. And if I put my cursor over the scissors, it says "Poly area for scissors" and this is actually shaped like the scissors. You'll notice that I've defined a polygon shape that goes around the scissors, and that's all defined in here. So here's the way that this works. We have our normal tag and it has this new attribute called usemap, and it gives a fragment address for the . And that fragment address is introduced by a hash mark, a pound sign, a number sign and then the name of the map.

And so down here we have a map and map is a container. See it has an end tag and it has a name attribute that names the map, and that matches up with this usemap attribute in the tag so that's how the tag finds the map. Now the map has area elements inside of it, and the area element is an tag so it has this little tag shortcut at the end and it has a number of attributes. It has an attribute that names this shape. A shape can be a rectangle with r-e-c-t.

It can be a circle. It can be poly for a polygon. And depending on which shape you use, your coordinates are going to be in a different format. For rectangle, you're defining 2 points, the upper left and lower right point and you'll draw the rectangle based on those two points. And each of these points is in x y format. So 50 here is the number pixels from the left side of the area and this other 50 is the number of pixels from the top of the area, and then you have an alt attribute. And just like the alt attribute in an image, this used for cases where the browser is not rendering this properly.

And you have a title attribute just like with the image. This will display when you hover over it or it will be used in a descriptive context. And then href is the link to whatever is being linked at, in this case is this rectangle.htm, and you'll notice that I don't actually have one. If I click on this I will get a little error message. So the same for circle, except with the circle we've the first two are the coordinates of the center of the circle. So it's 150 pixels from the left and 25 pixels from the top of the image, and the third is the radius of the circle, not the diameter with the radius.

That's the distance from the center of the circle to the outside of the circle. And then poly is actually very simple, but it looks very complicated. This is just a sequence of x-y coordinates, x,y,x,y,x,y,x,y,x,y and these coordinates must go around the polygon in order, and it can be in either direction; clockwise, counter clockwise. However you want it. They just have to be in sequence. So that if you were to draw a line from each of those and from the last one back to the first one, you'd have the polygon that you're trying define.

So that's all there is to it. That's how this works. That's what this looks like. You can see I can pretty much trace the edges of these and they do exactly what I'd expect them to do. Same with the circle there, and even with the polygon, so the image map feature allows you to define regions of an image as links. You can define rectangular areas, circular areas, and even polygons. This is a powerful and flexible feature.

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This video is part of

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HTML Essential Training

82 video lessons · 94699 viewers

Bill Weinman
Author

 
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  1. 5m 24s
    1. Welcome
      56s
    2. Using the exercise files
      1m 37s
    3. What you need to know about this course
      2m 51s
  2. 22m 0s
    1. What is HTML?
      4m 12s
    2. Examining the structure of an HTML document
      7m 50s
    3. Understanding tags and containers
      6m 4s
    4. Exploring content models in HTML5
      2m 23s
    5. Looking at obsolete elements
      1m 31s
  3. 27m 19s
    1. Understanding whitespace and comments
      3m 53s
    2. Displaying text with paragraphs
      3m 37s
    3. Applying style
      8m 5s
    4. Using block and inline tags
      6m 34s
    5. Displaying characters with references
      5m 10s
  4. 16m 36s
    1. Exploring the front matter of HTML
      2m 9s
    2. Applying CSS to your document
      3m 59s
    3. Adding scripting elements
      4m 54s
    4. Using the meta tag
      3m 34s
    5. Optimizing your page for search engines
      2m 0s
  5. 24m 59s
    1. Controlling line breaks and spaces
      2m 46s
    2. Exploring phrase elements
      1m 44s
    3. Using font markup elements
      1m 5s
    4. Highlighting text with mark
      1m 29s
    5. Adding headings
      1m 38s
    6. Using quotations and quote marks
      3m 2s
    7. Exploring preformatted text
      1m 45s
    8. Formatting lists
      2m 28s
    9. Forcing text direction
      3m 49s
    10. Suggesting word-break opportunities
      2m 29s
    11. Annotating East Asian languages
      2m 44s
  6. 29m 15s
    1. Introducing CSS
      55s
    2. Understanding CSS placement
      6m 55s
    3. Exploring CSS syntax
      10m 34s
    4. Understanding CSS units of measure
      3m 3s
    5. Some CSS examples
      7m 48s
  7. 22m 5s
    1. Using images
      4m 13s
    2. Flowing text around an image
      4m 55s
    3. Breaking lines around an image
      3m 3s
    4. Aligning images
      5m 25s
    5. Mapping links in an image
      4m 29s
  8. 22m 28s
    1. Understanding URLs
      2m 41s
    2. Working with hyperlinks
      3m 28s
    3. Using relative URLs
      4m 20s
    4. Specifying a base URL
      2m 19s
    5. Linking within a page
      4m 12s
    6. Using image links
      5m 28s
  9. 17m 2s
    1. Exploring list types
      3m 52s
    2. List elements in depth
      7m 44s
    3. Using text menus with unordered lists
      5m 26s
  10. 15m 30s
    1. Introduction to HTML semantics
      4m 9s
    2. Exploring an example
      4m 56s
    3. Marking up figures and illustrations
      2m 33s
    4. Creating collapsible details
      3m 52s
  11. 11m 18s
    1. Embedding audio
      5m 19s
    2. Embedding video
      5m 59s
  12. 11m 53s
    1. Creating ad-hoc Document Object Model (DOM) data with the data-* attribute
      4m 53s
    2. Displaying relative values with meter
      2m 57s
    3. Creating dynamic progress indicators
      4m 3s
  13. 4m 49s
    1. Overview of HTML5 microdata
      1m 8s
    2. Exploring an example with microdata
      3m 41s
  14. 7m 3s
    1. Understanding outlines
      52s
    2. A demonstration of outlining
      6m 11s
  15. 13m 1s
    1. Table basics
      7m 29s
    2. Exploring the semantic parts of a table
      2m 32s
    3. Grouping columns
      3m 0s
  16. 9m 55s
    1. Frames overview
      54s
    2. Using traditional frames
      4m 26s
    3. Exploring inline frames using iframe
      2m 7s
    4. Simulating frames with CSS
      2m 28s
  17. 53m 7s
    1. Introducing forms
      10m 24s
    2. Using text elements
      10m 12s
    3. Using checkboxes and radio buttons
      2m 37s
    4. Creating selection lists and dropdown lists
      5m 14s
    5. Submit and button elements
      8m 48s
    6. Using an image as a submit button
      2m 15s
    7. Keeping context with the hidden element
      3m 0s
    8. Setting tab order
      2m 7s
    9. Preloading an autocomplete list using the datalist feature
      5m 26s
    10. Displaying results with output
      3m 4s
  18. 19m 47s
    1. Touring a complete site
      2m 14s
    2. Touring the HTML
      8m 44s
    3. Touring the CSS
      8m 49s
  19. 29s
    1. Goodbye
      29s

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