I think SQLFORM should be changed to allow for IS_IN_SET with other
validators then you could just do:
requires=[IS_IN_SET(['','English','Chinese','Italian']),IS_NOT_EMPTY
()]
Or you could get fancy:
requires=[IS_IN_SET(['Please
choose...','English','Chinese','Italian']),IS_EXPR("str(value) !=
'Please choose...' ")]
It could just be a convention that requires[0] is IS_IN_SET (similar
to how IS_NULL_OR works currently).
On Sep 4, 11:58 pm, Iceberg <iceb...@21cn.com> wrote:
> Hi Massimo,
>
> My first web2py app is an order management system for my company, it
> worked well in enterprise production for more than 15 months now. By
> the way, all my other "first work of something" ended up as just a
> prototype but not this one, thank god and web2py. I am refactoring the
> app and going to share some ideas. Here comes the first one, about UI/
> UE aspect.
>
> Currently, if we write code like this:
> db.Field('language', requires=IS_IN_SET
> (['English','Chinese','Italian']))
> it generates a drop-down list for three choices and the "English"
> appears as the first option.
>
> It is ok but, according to my long time observation, users who are
> facing a long form with dozens of fields, tend to finish each blank
> field one by one, but won't give enough attention to fields showing a
> default value. So it would be much better if the above example can be
> rendered as a drop-down list with 4 choices: an initial blank, then
> English, Chinese, Italian. Currently this can be done by:
> db.Field('language', requires=IS_NULL_OR(IS_IN_SET
> (['English','Chinese','Italian'])))
> but with a side effect that the empty value is also acceptable,
> sometimes not what we want.
>
> So my proposal is to adjust OptionsWidget to always show up with an
> initial blank (when creating record), but not necessarily accepting
> it. Just change line 198 of sqlhtml.py from:
> opts = []
> to:
> if value:
> opts = []
> else: # To enforce an explicit choice when creating new record
> opts = [OPTION(_value='')]
>
> Please give it a try and hope you will like it.
>
> Regards,
> Iceberg
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