On Sun, 10 December 2000, Martijn Pieters wrote:
> > I am new at programming and have been unable to code a boolean button
> > into my Zope Portal registgration form that can recall the previous
> > selection such that it can be de-selected. Basically, I want to enable
> > a user on my site to sign-up, flip a boolean on, log out, then later log
> > back in and unflip that boolean. It's the "unflip" that catches me. I
> > have been able to make the boolean reflect the fact that it is selected
> > when the user logs back on, back I can't make it unselectable. Here's
> > the code I've got now that doesn't allow for de-selecting,
> > <input type="checkbox" name="current_college_student"
> > <dtml-if" member.current_college_student">
> > checked
> > </dtml-if>
> > value="member.current_college_student">
> > <b>Current College Student</b>
> > I guess I need to tell the database that if no value is entered, it
> > should delete "member.current_college_student" from its records.
> I am not sure what your problem is here.
> Are you talking about the fact that if the checkbox isn't checked, that
> the browser doesn't send *any* information about the field
> If so, you can check for it's absense with the DTML construct '<dtml-unless
> current_college_student> .. </dtml-unless>. Or you could add a hidden form
> field *before* the checkbox which defines a default, empty value, like so:
> <input type="hidden" name="current_college_student:default" value="">
> You can of course put any other value in there. The browser will always
> pass this back to Zope, and then you can test for the value of
> Hope this helps!!
That doesn't quite do it. Someone joins the network and is taken to a mandatory form
where they fill in eight pages of information about themself. They submit the
information. Everything's cool up to this point.
A year later, they graduate from school and become a farmer. They still want to be a
member of the network. They log back in, re-access their form information, deselect
the checkbox for "student" and select the "professional" checkbox. I can't get my
zportal ZODB to recognize the deselection. You'll notice in the code above that when
the box is checked and submitted, the value "member._____" is submitted to the
database. To display a checked box when the page is re-loaded, I use <dtml-if
"member.______">checked</dtml-if> within the <inpupt type=boolean...> tag.
Now, I want to tell the database that if a form page is re-submitted and a boolean box
that was checked is no longer checked, it's previous value should be deleted from that
Can anybody shed any light on the matter?
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