[profound subject: sorry the body may be less interesting]
This is so basic, but any help would be appreciated. It's also a Plone
site, but the problem is about basic tal behaviour so I hope it's
I have an attribute, 'listed' (a property of 'member') which I want the
user to be able to set or unset with a radio choice rather than by
checking or unchecking a checkbox, as provided in default join_form and
In personalize_form, I define listed like this:
listed python:request.get('listed', member.getProperty('listed',''))
The radio inputs return name="listed" and value 0 or 1
This works OK, but in the radio input code,
*always* returns 'checked'
and the second of these debug lines is *always* displayed, whether
listed is 0 or 1:
<p>debug: value of listed, after define with getProperty=<span
<p tal:condition="listed | nothing">debug: this para should print if
listed is true, ie equals 1</p>
Appendix C of the Zope Book says tal:condition tests for existence and
truth, and "missing variables, None, zero, empty strings, and empty
sequences false; all other values are true".
So what basic fact/knowledge am I missing?
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