Both directional pads and analog triggers usually show up in strange ways.
Analog triggers are typically mapped to a single axis for both. The axis will read 1 for 1 trigger fully depressed, -1 for the other and 0 for both. Partial depression of a single trigger will read a value between 0 and the extreme (1 or -1). Partial depression of both triggers will read something, or 0 (I recommend not having a control scheme that does this).
D-pads show up in different ways depending on the controller, but also typically map to an axis. This thread has a mapping for the F310 in it:
http://www.chiefdelphi.com/forums/sh...ighlight=d-pad