[jQuery] how to trigger a functionality when 2 fields are filled

[jQuery] how to trigger a functionality when 2 fields are filled


hello!
in a complex form i'm working on, there are 2 textfields allowing to
specify a startdate and an enddate.
I need to display an additional form UI ( spanning the weeks in
between the two dates) WHEN the two fields are filled in.
I have absolutely no idea on how to make such an event. I guess it's
about creating "custom" events ?
any idea/tip/tutorial would be much appreciated !
thank you,
alexandre