Slider to set a range for a age selectionbox

[#1]

Hi experts,

I''m clicking around in the demo apps on the qlikview site to get some ideas for my own application.

( http://eu.demo.qlik.com/detail.aspx?appName=Sales%20Management%20and%20Customer%20Analysis.qvw) Sales Management and Customer Analysis

In one example a saw a selectionbox with ranges of age with below a slider to set the rangewith.

This is something i would like to use for my own application

Can anyone give me some tips/trics to get me in the right direction?

I' have attached an picture of the example i reffered to.

Thnx a lot!

[#2]

I already download the file from the website. First I didn''t see you can download the file.

but now i see the example i can specify my question maybe.

The slider sets a variable ageRange. But i do not see the link - connection to the list box above.

I do see expression, but most of them are to calculate the amount that is standing behind the range.

But i just want  11 till 20

                       21 till 30

                       31 till 40

Can anybody explain how this connection works?

[Anonymous · Accepted solution]

Please see attached example.

It uses Class() to generate the dynamic ranges.

[#4]

Thnx for your quick response.

I see that you introduce a vInterval that will get a value from the slider.

Next i see that on the list-box you use it on the caption you use the following statement:

=class(Num, $(vInterval))

so vInterval is input for this class. But i do not understand how this will result in : 0 <= x < 15 for example.

does the class arranges this? Or do a miss something?