I have tried to do this, but if you delve into the prototype
even though rails includes the option. I believe there is a way to
detect the enter key in js, but I cant recall exactly how. What I
ended up doing was to add a dummy field following the field I want to
detect the blur. I then detect the on focus to do the call to remote,
where I then do my update and use set focus to move to the next field.
Not ideal, but it achieves the desired result.