[Zope] TAL: test() or condition Howto?

[D2]

Elena Schulz a =E9crit:
> Hi,
>=20
> I have the followong TAL-expression:
>=20
>     <td
>     tal:content=3D"structure python:here.test(myImportantCondition and
> myExpensiveMethod(), myExpensiveMethod(),
> 'myDefaultString')">myDefaultString</td>

use python:test(<your test>) instead of python:here.test(<your test>)
          ---                                 -------

>=20
> To execute 'myExpensiveMethod()' 'myImportantCondition' must be 'true'.=
 But
> I want to avoid to execute 'myExpensiveMethod()' two times. How can I a=
chive
> that? As default-value myDefaultString should be served.
>=20
> I don't know a way with tal:condition 'cause on 'false' there is no way=
 to
> get 'myDefaultString', isn't it?

tal:condition=3D"not:(here/myImportantCondition() and=20
here/myExpensiveMethod()"
tal:define method here/myExpensiveMethod()

Due to my lack of experience, i'm not sure that the use of the=20
parenthesis in myImportantCondition() and ...Method() is correct.

Have a look at Page templates and TALES expressions in the zope book
http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition

HTH


>=20
> -- many thanks for your replies, Elena
>=20
>=20
>=20
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>=20


--=20
Andre
PZP Enthusiast