[ZPT] exceptions

[Evan Simpson]

From: "Magnus Heino (Rivermen)" <magnus.heino@rivermen.se>
> How can I do this with ZPT? Catch an specific exception and read the
error.

In this particular instance, I would put the validation call into a
Script, like this:

## Script (Python) "is_valid"
##parameters=
try:
  context.form.validate_all_to_request(context.REQUEST)
except FormValidationError:
  return 0
return 1

        <ul tal:condition="not:here/is_valid">
          <li tal:repeat="error request/error_value/errors">
          <span tal:replace="field.get_value('title')">Title</span>:
          <span tal:replace="error/error_text">Error</span>
          </li>
        </ul>

Another approach would be to place the error body in a DTML Method,
render that in the Script, and use tal:replace="structure
here/error_if_not_valid" to insert the text returned by the Script.

Cheers,

Evan @ digicool