How add a filter not related to the datamodel but to be used in master item measure to determine a certain condition in calculation

[kristien]

Hello,

I'd like to add a filter where the user can select between two options.

The options itself are not related to any data in the data model.

I want to make a masteritem that calculates a total, but with a condition: the result will be different if the user select option A or option B.

That way, on the chart I can show a linechart of that masteritem, and depending the option that the user selected another line is displayed.

A simple Example:

I Add in my script 

Switch:
Load * Inline [
Switch
A
B
];

I will use this field to put on the dashboard as a filter. You can select A or B. But there are no relationships with the data.

I make a Master item Measure, ie. TotalSwitch that could be:

If(
GetCurrentSelections(Switch)='A' or GetSelectedCount(Switch) = 0
, Count({<Field1={'1'}>} distinct Field2)
, Count({<Field3={'1'}>} distinct Field2) 
)

The conditions cannot be selected in the database.

But this doesn't work because when I select A in the Switch-filter, GetSelectedCount(Switch) is not 1 but a certain number of records (all)

How could do that 

The perpose is: the user can select an option: A or  B 

and in the line chart, another line will be shown according to what the user has selected.

[kristien · Accepted solution]

I have found a solution.

What I stated in my question is not completely correct: GetSelectedCount(Switch) was correct (1) but the  performance was too poor to show the Master Item Measure and at the end it did not show but I got an error.

I added a numeric value to my filter field and implement that in may master item and this works better

In my script I have now something like:

Switch:
Load * Inline [
Switch, SwitchNr
A, 1
B, 2
];

And in the Master Item Measure something like

If(
Max(SwitchNr) = 2
, Count({<Field1={'1'}>} distinct Field2)
, Count({<Field3={'1'}>} distinct Field2) 
)

(It is in version qlik Sense June 2018 )