This is not the "typical" use of Qlik Sense, so I'd say it's not something that can be done easily out of the box. The following can be used as a work around, with some limitations:
1. Create a separate field that could hold 2 values with the KPI names - KPI1 and KPI2. Add a Filter pane that allows the user to select one KPI or another.
2. In the Measure definition of your map, create a condition expression that selects one or the other calculation based on the selected value of the KPI field:
IF (KPI = "KPI1", <calculate something>, <calculate something else>)
Caveats: currently, there is no way to require that a single value is selected in the Filter pane.
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Yes. Use this extension :
This will provide you buttons using which you can assign upto 5 expressions.
Assign different expressions to different buttons and then use if statements in the map expression.
Check out the attached app. But first install the extension.
Test123.qvf 176.0 K
Yes, you can create an "data island" of the values you want for the switcher - then tie the measure into the value of this selection.
Attached is an example showing you how to switch between 2 different KPIs based on some random data on UK postcodes.
Map Select.qvf 352.0 K