Design Pattern 6: Definition lists : point/counterpoint

Michael Dain, Wednesday, April 16, 2008 @ 10:05 am

I encountered a similar situation to Noel's when developing a site recenty. The design called for, or made reference to, a opening and closing header with details shown or hidden by a click on that header. I approached it in a different way, which may be interesting to compare the two, but leave it out there to debate the merits of each. When solving a problem, I normally begin with the same axiom that was mentioned in an earlier post - What is it? What is it's nature? HTML markup, as you may know doesn't have much in it, a mere 20 or so tags, but with the addition of ID's or classes, you can uniquely identify everything the web has to deliver, which is pretty powerful.

In looking at the elements controlled by another element, the most fitting markup is a definition list. For some reason these elements are mysterious and not too often used. It is a list <dl> that can contain two elements <dt> and <dd>. Normally they have a default display of one element being bigger and the other slightly indented, as to look like a directory. So, with little or no work we can describe the two types of list elements, the 'header' - <dt> and the information that can be 'opened' the <dd>.

So having my markup, well, marked up, I can set aside the HTML, produce some styles for the list, but what about the complicated part? Adding the behavior to hide/show, make the <dt> clickable, swap the GIF's that indicate opening and closing, and while we're at it why not a 'expand all' or 'close all'. Finding it was no mean feat, but with some very creative google searching I found the script - http://www.tjkdesign.com/articles/toggle_elements.asp. So this handles all the heavy lifting, and basically degrades nicely in a non-javascript situation to show all elements. Problem solved.

The satisfying thing about this solution is that the code is clean, and easy to change, and any presentation issues are handled within CSS, along with any behavior in javascript, and handled by the client. I think the two approaches compliment and contrast each other nicely, add your own solutions to the comments if there are even better ones.

user experience design

Comments: 1 so far

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1. 

   Technically, a DL is called a “definition list.”

   Regardless, they are very useful and your article perfectly illustrates their semantic potential.

   Comment by Zack Frazier, Tuesday, May 6, 2008 @ 5:35 pm

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