*Multiple = False*
IS_IN_SET(['a', 'b', 'c'], zero=T('choose one'))
To unselect, click 'choose one' instead of whatever was selected.
*Multiple = True*
Unselect/remove everything which was previously selected.
...then submit the form.
On Saturday, 25 May 2019 01:32:23 UTC+1, jim kaubisch wrote:
>
> old posting, but have a related question -
>
> In a form dropdown, certainly multiple but probably under some
> circumstances single, how do I un-select a previous choice without choosing
> an alternative? Simple example is - currently I have chosen 3 elements of
> the list, a, b, c and now want to unselect b without choosing an
> alternative. i.e. I want the resulting list to be a,c (or even empty if I
> unselect all three), but I see no way of doing that. The "single" case is I
> have made a choice, now want to undo that choice, i.e. end up with an empty
> list
>
> Am I missing something obvious?
>
> Thanks
>
> On Wednesday, January 30, 2013 at 2:41:16 AM UTC-8, Thomas Bellembois
> wrote:
>>
>> Hello web2py community,
>>
>> I have a multiple select widget:
>>
>> db.PRODUCT.class_of_compounds.requires=[IS_EMPTY_OR(IS_IN_DB(db,
>> db.CLASS_OF_COMPOUNDS.id, label=db.CLASS_OF_COMPOUNDS._format,
>> multiple=True, sort=db.CLASS_OF_COMPOUNDS.label, zero='choose'))]
>>
>> The "zero" field does not appear. If I change multiple from True to
>> False it appears.
>> I have probably missed something in the documentation...
>>
>> How can a user then unselect an item ?
>>
>> Regards,
>>
>> Thomas
>>
>
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