>
> if radio1 checked:
>  then deg_or_rad is checked against range (-4:4)
> if radio2 checked:
>  then de_or_rad is checked against range (-360:360)
>
> Can I do this in web2py without using javascript ?
>
>
Why you should use javascript?. I think you can change the validator 
accordingly by reading the request.vars object before processing the form:

if request.vars.radio1: db.mytable.mydata.requires = IS_INT_IN_RANGE(-4, 4)
elif request.vars.radio2: db.mytable.mydata.requires = IS_FLOAT_IN_RANGE(-
360; 360)
else: <default validator>



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