chris at placenamehere.com
Fri Feb 3 18:31:45 PST 2006
On Feb 3, 2006, at 9:30 AM, Jim Ley wrote:
> On 2/3/06, Gervase Markham <gerv at mozilla.org> wrote:
>> Jim Ley wrote:
>>> the document of course shows no use cases at all.
>> Is there some doubt that the ability to tag an arbitrary set of
>> and later easily get an array of those elements is a useful feature
>> web development?
> I've yet to hear of an actual reason to do so, people keep saying it
> seems useful...
>> If you would like use cases, I present all of the web pages currently
>> using a JS implementation of getElementsByClassName based on
>> getElementsByTagName("*") and some manual class name inspection logic.
> Yes, but they're all using it to attach events to every one of the
> class, which is why you have to look at use cases, the reason they're
> doing it is not because getElementsByClassName is missing, but because
> addEventListenerToClass or -moz-binding etc. are missing.
> It's the classic mistake of looking at making the workarounds easier,
> when you should be looking at making the underlying use easier.
Jumping in a little late here, and with a theoretical case only in that
I haven't implemented the specific combination of scripting the
animations and the markup, but work with me here....
* Take a form that has been processed with some validation error
* Use CSS class "error" to mark some specific text elements your
favorite shade of red
the AJAXy kids love to use
And you have something like this (please forgive markup errors):
<p class="error">Some information was missing. Please fill out the
<legend>Who are you?</legend>
<label class="error" for="fn">Name:</label> <input type="text" id="fn"
<legend class="error">Favorite Sports (Pick at least one)</legend>
<input type="checkbox" id="hockey" /> <label for="hockey">Hockey</label>
<input type="checkbox" id="football" /> <label
<input type="checkbox" id="baseball" /> <label
And a script that on document load (or some other event based trigger
like a fresh validation attempt.. point being the event listener is
elsewhere) that would grab all of the elements in the page with class
"error" and give them an animated/fading border and background for a
Just the first case that popped into my head. Another rough case would
be a file serving application where a "thumbnail" isn't always an
<img> but sometimes a <span>No Preview Available</span> or perhaps a
flash or sound player <object> (or maybe in the future SVG) but in all
cases the element used is categorized by class="preview".
if pressed I could probably look over some old work with scripting
animations/dhtml and find cases where this would also be very helpful,
but they would be less applicable to your typical html usage.
 in an app like this one: http://files.lussumo.com/
[ Chris Casciano ]
[ chris at placenamehere.com ] [ http://placenamehere.com ]
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