[IxDA Discuss] select exact number widget?

[Mark Roudebush]

Nice John.
That's really good.


On Jan 5, 2007, at 12:08 PM, John Schrag wrote:

>
> Victor wrote:
>> Conceptually, an option I'm considering is like selecting
>> two apples from a pile of apples at the market, as you select
>> them they are moved away from the group. So the shopper understands
>> you can only pick two, the apples are moved into an area just
>> big enough for two apples. This approach requires a way to
>> unselect as well; with checkboxes that's already familiar.
>
> If there must always be exactly two things selected, you could turn  
> the
> problem around.  Imagine the list of choices is visible, and by  
> default
> two of them are labelled somehow (say, with tags that say "1" and  
> "2").
> The UI would then allow the user to move the tags to any position  
> on the
> list (except over top of each other), rather than moving the list  
> items
> themselves.
>
> An advantage of this approach is that it ensures that there are always
> two items selected; you don't have invalid intermediate states, where
> zero or one items have been selected.
>
> There are all kinds of refinements you could make on such a design, of
> course.
>
> -john
>
>
>
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