[web2py] crud + hidden fields that need to go into the DB?

[Rob]

I have a model that has a 'Address', 'Lat' and "Lon' field.  When the
user enters an address, some javascript currently populates the 'Lat'
and 'Lon' fields and they get inserted into the DB via crud.create()
or crud.update().

How do I hide these fields from the user, but allow the JS to insert
the correct values?  Idealy, I would like to turn these fields from
input fields to hidden fields.

Possible?

just for reference:
model:
db.define_table('Dinners',
    Field('Address', requires=IS_NOT_EMPTY()),
    Field('Latitude', 'double'), # <== I want this to be a hidden
field
    Field('Longitude', 'double')) # <== I want this to be a hidden
field

controller:
def Create():
    crud.settings.formstyle='table2cols'
    form = crud.create(db.Dinners)
    return dict(form=form)

view:
{{=form}}

Thanks!