I'm developing a registration form for our school's website
where new students will be able to register for class.
Some of the
fields will be required others optional.
However there will also be several sets of fields where only one or
more but not all will be required at the same time (e.g.
We either need a home phonenumber, a mobile phone or eMail address to
be able to contact them).
How can I get this implemented? All I can find is to either set the
fields to required of optional.