Question

Can you capture events from the 5-way keypad of a device using Opera Mini using Javascript?
(My guess is the answer is no, but I figured I’d ask anyway)

Answer 1

I’d say no, because Opera says on their dev site that they don’t support client side javascript after the page is loaded:

There are a few more caveats specific
to Opera Mini 5 that developers need
to be aware of: The majority of
JavaScript that is triggered onload
should work just fine, except in cases
where those scripts require
asynchronous operations. JavaScript
won’t run client-side (for instance in
response to user interaction) once the
page has finished loading. Plug-ins,
such as Adobe Flash, are not
supported.

Source: Opera Mini 5 specs

Still, Opera Mini does support other Javascript actions, but they all get executed on the server.