Standard Way for Upload without Page Reload (aka Ajax Upload)

I've just entered to this group and this is my first message. Hello

I know this seems to be a recurrent discussion, but as I couldn't find
any relevant discussion before 2007, I'm asking again: there is some
"standard way" (I mean, directly supported or provided from RoR) to
make file uploads without page reloading (aka Ajax Upload -- I know,
this is not _really_ Ajax)?
The best material I found about it is very descriptive indeed (http://,
but it is from 2006! So, I refuse to believe there is not something
new about it.
So, what do you say guys (and girls too =P)?