Matthew Raymond wrote:
Dave Raggett wrote:
  required (or needed)
    This is an expression like validate but requires the user
    to have filled out a value for the field. The library
    evaluates expressions by first rewriting them and then
    calling the JavaScript eval function.

   I don't see why required fields should have dependencies on other
fields. A simple |required="required"| attribute should suffice.
[...] There might be a use case here, but you have yet to present
it.

Actually, conditionally required fields would be a very nice addition. I built this site earlier this year, which has conditionally required fields.

https://www.edentiti.com/create/details.jsf

See the Postal Address section. It's required unless it's the same as the residential address. If you check the "Use residential address" checkbox, the fields are no longer required. If you uncheck it again, they are. The JS updates the fields as soon as you check or uncheck the box.

--
Lachlan Hunt
http://lachy.id.au/

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