enigma1 - 5:12 pm on Apr 22, 2011 (gmt 0)
How else could they follow on-page search links?
If it's a /GET form they process it or try to process it, I believe from some old article I remember reading about it. Navigation via <a> links is the main path they follow but of course they do try to process js.
It's bad if they automatically submit forms because even simple search forms waste bandwidth. At least so far from my logs I haven't seen google doing a /POST. That will be real news to me.
So with js what I do to avoid complications and eliminate uncertainty ie what the bot is going to do by parsing the js part of the page is to deploy a js framework (like jquery) where js is totally transparent - not mangled with html. And I only use /POST forms to be sure they won't try anything fancy.