Ed Leafe wrote:
On Jan 24, 2006, at 2:05 PM, Henning Hraban Ramm wrote:
Is there already a possibility to use a 'list' field type (with
FieldSpecEditor or else)?
I need that e.g. for 'set' types or for lists from other tables.
No, there isn't. I've thought about this in the past, and could
never come up with a clean interface for specifying the list source. I
thought of adding a pre-defined method to the form that would be called
with the field name when the form was created, which would then return
the list of choices for that field. It would then be up to the developer
to code that method in the generated form code with the appropriate
logic. But I never got around to adding it, and then Paul took over the
AppWizard development, and I haven't thought about it since.
What do you think about that solution? If a field is designated as a
'list' type, the developer would have to be responsible for writing
method code that would accept the field name as a parameter, and return
a list to be used to populate the list. We could even specify two types
of list: 'list' and 'ddlist', with the former creating a ListBox and the
latter creating a dropdown list.
Currently, datanav.form defines three methods that could be of interest:
getEditClassForField(self, fld) --> class to use on edit page
getSelectControlClassForField(self, fld) --> class to use on select page
getSelectOptionsForField()(self, fld) --> options for use in the select
options dropdown
I've used getEditClassForField() to return dropdown lists and radio
groups, set with their Choices filled in from a lookup bizobj and their
DataSource and DataField set to the master bizobj. Pick an item from the
dropdown, and the key value propagates to the master bizobj.
Similarly, I've used getSelectControlClassForField() to put a radio box
of choices to select from in the select page.
This isn't exactly what you are talking about here, but I just wanted to
point out what already exists.
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