The NumberRangeFilter won't do that for you.  A 
CategoryFilter<https://developers.google.com/chart/interactive/docs/gallery/controls#categoryfilter>would
 allow your users to pick which countries they want to see.

On Thursday, January 17, 2013 11:05:22 PM UTC-5, jsladmin wrote:
>
> I need to show 10 Countries initially, and allow the User to select 
> the # of Countries they'd like to view (2, 5, 8, etc.). 
>
> On Jan 17, 10:53 pm, asgallant <[email protected]> wrote: 
> > You're trying to use a NumberRangeFilter on a string column, which won't 
> > work.  What do you want the slider to do? 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > On Thursday, January 17, 2013 9:37:07 PM UTC-5, jsladmin wrote: 
> > 
> > > I created this Google Bar Chart:  
> http://www.bench2biz.com/temp/olympics 
> > 
> > > I'm trying to add the Google Slider, but am stuck on what is missing. 
> > 
> > > Suggestions on a Google fix are much appreciated ! 
>

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