Use dimensionality in drill down group in bar chart

[curiousfellow]

I have a bar chart with a drill-down group containing three expressions of a timestamp 

year(timestamp), month(timestamp), day(timestamp)

When the lowest level (day) is shown in the chart I want year and month in the title. Some posts here use dimensionality to test what level is shown, but that does not seem to work in a chart.

Is there another way to know what level of the drill down group is shown ?

[Or]

For QlikView, you should be able to use GetCurrentField(Groupname) to find out which field is currently active in the group.

[stevejoyce · Accepted solution]

To determine in title, i think you must derive based on possible count, mimicking what the drill down does.

if(count(distinct year(timestamp)) >1, 'year',

  if(count(distinct month(timestamp)) >1, 'month',

  year(timestamp) & month(timestamp)

))

[curiousfellow]

That does not seem to work because it is a calculated field.