Night of the Image Map

by Stuart Robertson

67 Reader Comments

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  1. Another point, I believe, is that image maps are going to make understanding of the design more intuitive. Separation of content and design is great… as long as it maintains the simplicity of the code.

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  2. “given the fact that you need to hide the CSS from NS 4.7, isn’t the image map method more accessible?”

    I’m not going to debate image maps versus this method, but I can’t imagine even a remotely advanced CSS-only layout that you don’t have to hide from NS 4.x.

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  3. The basic idea is great. CSS can be used to do the exact same thing as image maps.

    However, your execution falls apart if I’ve specified my browser to always provide a margin on the page (in mozilla, this is just body{margin:10px !important}. To fix this, the image map should have position:relative specified to take it out of the normal flow and therefore make the positioned elements inside of it render correctly.

    Also, someone correct me if I’m wrong, but aren’t absolute positions only allowed to be applied to block elements? Regardless of whether or not it’s true, the a elements should be block anyway, and then have the height and width applied to them to get them sized how you want, since that’s the intended effect and keeping them inline and trying to get them to work that way is harder to do, more likely to render incorrectly for other people, and incorrect usage..

    And finally, what’s wrong with visibility:hidden on the a elements themselves? Does that make them unclickable?

    Other than those, though, it’s a great idea. :-)

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  4. A minor request to the editors and future ALA authors. How about embedding the style sheet in the HTML page rather than linking to it. This would make it easier for readers to view the source. Yeah, we can still get to the CSS if it’s linked, but not as quickly, and all the code’s not in one file.

    I agree with many other comments: good technique and good article, but there was no reason to bad mouth image maps in the process.

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  5. Larry wrote:

    >>>A minor request to the editors and future ALA authors. How about embedding the style sheet in the HTML page rather than linking to it. This would make it easier for readers to view the source. Yeah, we can still get to the CSS if it’s linked, but not as quickly, and all the code’s not in one file.<<<

    I hear you: one file is easier to grab and view than multiple files (a markup file and one or more CSS files).

    But we encourage our authors to do what Stuart has done here (separate markup from CSS) … and most of our authors do it without prompting.

    Here’s why we prefer to do it the way we do it:

    1. The markup file is uncluttered; you can see how simple and clean it is. If the CSS were embedded, you’d be looking at a more complicated page and it would be less clear what part of that page to focus on.

    2. Separation of presentation from structure is a primary advantage of these techniques, and the examples should reflect it. You could take this XHTML file and give it an alternate style sheet (but you couldn’t do that if the CSS was embedded).

    3. Also, although our readership includes some of the most sophisticated and technically savvy web designers around, it also includes people who are new to these techniques. Not all of them know how to link to or import a style sheet … or they may know but not have enough experience to remember how to code the link or the @import directive. The example includes the link and saves these readers the trouble of trying to remember how it’s done.

    Make sense?

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  6. Also, it’s quite handy to have CSS in a separate window so you can scroll it independently of the HTML and get a better idea of how it works.  I hate having to scroll up and down.

    If you use Safari, try the Activity window.  It gives a list of all open URLs and components of those pages so you can get to the stylesheet (and anything else) quickly.

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  7. I wonder if it would be possible to do several things from here to address several things. One – if the image itself, which in this case is just one big solid image, could be sliced and re-assembled with css?

    Two – is it possible to create a server side image map with CSS, building on the above suggestion?

    My reasoning for both of the above is to save bandwidth, and increase load time, while preserving the option of showing a wonderful UI like that.

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  8. If we can’t have embedded stylesheets (which your reason are good enough to suggest to me) then can we please get a link to the css file at least in the tutorials ?  Or perhpas display the code inside the examples themselves as text on screen rather than have us grab the source of the page itself.

    The logic of having beginners here is sound but also by stripping the css out and not linking it, they might have trouble finding it.

    Plus here in work whenever I type the address of a css file into Ie it launches the thing in ruddy InterDev and I don’t have rights to change the lau=nch options.

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  9. xtort,
    I’d assume that you could spit out one large image and use the background-position property to manipulate what portion of the image is seen through the div. It would be a matter of mapping the server side image areas to top/bottom left/right background-position coordinates and setting the div height/width to get the proper look.

    I think it would probably be better though to have several small images than one large one, unless you can assume that all your users are on an Intranet or broadband.

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  10. At the company I work for Netscape 4 users make up less than two percent of all individual users. That’s out of the millions of users we get every month. I think that the figure is around 10,000 users. We have now taken up the policy that Netscape 4 users no longer have to be supported. In this debate I’m trying to convince everyone that it would be better “gracefully degrade” for Netscape 4 users.

    I think this is a nice option for an image map with the few corrections by dolphinling (http://www.alistapart.com/discuss/imagemap/5/#c6037). As others have said, this is not for every application, but it is another option to think about when designing a site. Especially with the rollover effect(sp?).

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  11. “We have now taken up the policy that Netscape 4 users no longer have to be supported. In this debate I’m trying to convince everyone that it would be better “gracefully degrade” for Netscape 4 users.”

    Agreed. However, I would say that you still ARE supporting NS 4. As long as all the relevant (or important or mission-critical, or whatever) content and functonality is accessible and usable in NS 4, it is supported. It’s just the presentation that differs.

    My point is that one should be careful with the phrase “no need to support NS 4”, because it could be misinterpreted and (especially when it comes from us “standards” people) used as justification for making web sites that are completely unusable in NS 4.

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  12. That’s all very good, but to be honest, CSS-P not image maps. OK maybe calling it image maps is useful for people that want to carry on in the old ways using the new technologies, whatever.

    Now, I was thinking the same as Lim Chee Aun on the <ul> thing.
    And using the CSS preloading hover is a good idea too.

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  13. I wound up looking at this article hoping for a solution to a problem I have.  I am trying to display charts that allow for heavy user interaction.  The chart package I use happily provides an easy way to generate an image map.  BUT—the effect I want is for the user to see the each chart region highlighted as the mouse hovers over it.  Imagine the user is presented with a pie chart and when she hovers over a pie slice the border of slice becomes red instead of black.  When the user clicks on the pie slice they get a menu that allows them to manipulate the chart in useful ways (for example change the color of the pie slice or see detail information)

    This sounds like it ought to be a simple straightforward task for an image map, but is not.  I have tried code such as this:
    —————————————code begins————————————
    <html>
    <body>
    <img
    usemap=”#mymap”>
    <map name=“mymap” id=“mymap”>
    <area alt=“1” title=“1” shape=“poly” coords=“60,15,90,15,90,35,60,35”
    tabindex=“1”
       
       
      href=”#” target=“_self” >
    <area id=“area1” alt=“2” title=“2” shape=“poly” tabindex=“2”
    coords=“90,120,110,120,110,140,90,140” href=”#” target=“_self”

       
     
    >
    </map>
    </body>
    </html>
    ———————————————code ends————————————-
    But without success—it does not reliably work. 
    I think that perhaps the only way I will be able to get the effect I want is to build—on the fly—transparent GIFs that show my desired outlines and use a rollover to display them.  This is a pretty heavy weight solution both in terms of server resources and also from a number of images downloaded perspective—but seems to be the only way I am gonna get this effect in a reliable manner.
    Any better ideas out there???  Thanks for reading.

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  14. Charles it sounds as if you need a technology like flash or more likely SVG. Transform your charts into an interactive SVG image which can be scripted to provide the functionality that you want. People would then just need adobe’s svg viewer plugin.

    I think there are ways to do it with CSS and HTML but SVG is a more appropriate technology.

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  15. I like it too, and it does appear to meet accessibility for those who use screen readers.  However, it does not appear to meet accessibility for people with low vision who do not use screen readers.  I tried changing the font size in Mozilla using View/Text zoom and it (as expected) has no effect.

    So somebody would have to code additional styles in their personal style sheet to navigate this page.  (I don’t see any quick setting in Mozilla to ignore the currently active style sheet.)

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  16. This method strikes me as a good way to create html-only versions of graphic-intensive flash sites. I agree, I’d rather use spans and have my markup a little less clear than use a deprecated tag like <i> – call me a purist but it just seems wrong! Maybe use <a> instead? Cool idea overall though.

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  17. The idea of css was originally that it was less of a hack than html – more elegant, more maintainable. But now we are seeing so many ‘techniques’ in css which are much more complex that the html methods they replace… such as this one. I don’t approve. css pages still don’t render the same in different browsers anymore than html code did. css has not proven to be an advantage, and this article is one more example of that.

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  18. The approach worked better then a map in our application and also reduced the final size of the code. Thank you for taking time to share your solution !! Some of us appreciate your efforts.

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  19. This solution, with the enhancements on the li and preload-stuff, seems very logical and flexible to me. For those who aren’t convinced: Imagine how you can print this page. Just make a print-stylesheet and there you go!

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  20. Please read Danny Goodman’s “Super-Efficient Image Rollovers” [1] featuring a 3-state rollover client-side image map—CSS + JavaScript combo. It works will all W3C DOM-compatible browsers (not tested with Safari though) and web crawlers!

    [1] http://www.oreillynet.com/pub/a/javascript/2003/07/01/bonusrecipe.html

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  21. In my summer job I ran accross a similar problem and reached a slightly different solution.  Keep in mind though that I was designing only for IE6 (not a project that went to the web) so I was free of many constraints and constrained in many other ways.

    I kept the background image just one whole image with the actual lettering (non glowing).  I made an invisible link over the lettering (absolutely positioned) that contained a hidden (visibility: hidden;) image (the glowing lettering) that was shown by calling a javascript function when the mouse over rolled over (onmouseover) and hid it when it was rolled out (onmouseout).

    Of course this doesn’t rely purely on XHTML and CSS and I didn’t really look into accessiblity and other such issues, but it was definely a lot less code than this technique and seems sound.  I am sure with just a little more code this can be made accessible as well.

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  22. Nice article. Unfortunalley it will only work in IE 5 and 6, if image is located in the upper-left corner.

    If you set the body.margin to 50px, then it does not work. Althoug the CSS Map should be relative to the parent div object.

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  23. I really liked this article as it solved a problem for me with Elastic Design (see the “Elastic Design” article else where on this site).  I was trying to create an elastic design where the images would scale in proportion to the rest of the text on the page.  The problem was the specs required that certain images be clickable via image maps.  How do you get an image map to scale when all of the coords are specified in pixels?  Answer, you can’t.  This method does however!

    I’m including my sample code below so I can point out one minor problem I found in IE6.  For the longest time, I couldn’t seem to click on the area I had defined except when I was directly over the small border I had made around the link (so I could see it).  If I removed the border, I couldn’t click on the link at all!  The answer seemed to lie with the background of the link.  As soon as I set one, I could click on the area.  We use a single transparent GIF in our pages for tracking and other purposes, which made me decide to try using it as a transparent background for the link.  This solved the problem.  Here’s the code in case any one else wants to review it.

    <html>
    <head>
      <title>Untitled</title>
      <style>
      body {
        font: 60%;
        color: #000000;
        margin-left: 50px;
      }
     
      div {
        margin: 0px;
        padding: 0px;
      }

      div#Charlize {
        width: 13.8em;
        height: 6.6em;
        position: relative;
      }
     
      img#Charlize {
        width: 13.8em;
        height: 6.6em;
      }

      #menu {
        position: relative;
      }

      #menu a i {
        visibility: hidden;
      }

      #menu a {
        position: absolute;
        text-decoration: none;
        border: solid 1px red;
        background: url(“s.gif”);
        width: 3.75em;
        height: 1em;
        top: 1.2em;
        left: 7em;
      }

      #menu a:hover {
        border: solid 1px yellow;
      }
      </style>
    </head>

    <body>


    <div id=“Charlize”>
      <div id=“menu”>
      eyes
      </div>
      hp_spotlight_CharlizeTheron1.jpg
    </div>

    </body>
    </html>

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  24. In “Separate CSS file”…, Gabe wrote:

    If you use Safari, try the Activity window. It gives a list of all open URLs and components of those pages so you can get to the stylesheet (and anything else) quickly.

    This is fantastic! I can’t believe I didn’t already know this. I’ll use this daily.

    Thanks for the valuable hint Gabe.

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  25. I have coded a similar imagemap with text and image pop-ups) on www.jumbotours.co.jp/e/index.html but i’m puzzled with IE 6.0 behaviour. The list items are really close together and sometimes another underlying list/link show up through the pop-up. Any ideas?

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  26. Cool! Answered my question (discussion page 2): http://www.alistapart.com/d/sprites/ala-blobs2.html

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  27. I think, that in example very hard pictures :(
    In the net with slow modem this page will download very very long time…

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