Some quick background:
I'm developing a portlet to be deployed in Liferay 4.2.1. They use
prototype as their javascript framework. One function that is used in
a couple of places is getElementsByClassName. I have problems with
the use of that function because of its use of getElementsByTag("*").
I even altered getElementsByClassName to take a third argument so as
to replace the call as getElementsByTag(tagName || "*"). That only
offered a moderate performance increase. Performance is an issue
because my portlet is essentially a 35x900 table, which is
unavoidable.
I am now considering walking the DOM, since getElementsByClassName was
being used to only fetch the 0'th element of the returned array. If
anyone knows of a quick way to nab the first matching element, please
tell me! I am new to prototype, but it seems pretty straightforward
to use. A function like "getFirstElementByClassName" would be
spectacular in this case, especially if it didn't retrieve all
descendent nodes in the process.
I thought about implementing it myself using prototype's up/down/
previous/next functions, but as far as I can tell reading the source,
those functions also get all descendents via
recursivelyCollect(previousSibling/nextSibling).
Am I mistaken about how recursivelyCollect works in the above cases?
Will recursivelyCollect('nextSibling') dive through all descendents,
or just those one level deep?
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