Greetings

I have a form built with sqlfactory

form = SQLFORM.factory(
    Field('meter', requires=IS_NOT_EMPTY()),
    Field('date_from', 'datetime'),
    Field('date_to', 'datetime'),
    Field('amt', 'float'))



then i want to have a form in the view where users will access the 3 first 
fields in normal mode and the amt one in 
*Readonly,*After filling those 3 i use* Ajax(Where the problem is) *to load 
a function that has a *query *in it to calculate the *amount*, then i fill 
the output of that function to the last field(amount).

The problem i have is how to call that ajax *method *to *launch the query 
and auto fill the field* when those 3 fields are filled.

Regards,
Oasis

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