Hi @avid_learner,
I’ve altered my example to use a parameter, parameter control and calculated field and have a possible solution for all but the legend-updating.
My parameter pTestRegion is defined as follows:
(note the Reserved Value is set to “Null”)
The parameter control is configured as follows:
The calculated field cfSelectedParamCount then looks like this:
ifelse(in(Region,${pTestRegion}) OR in(NULL,${pTestRegion}),1,NULL)
Finally, the line chart visual (for a simple count of rows) is constructed as follows with all regions selected:
And with only 2 regions selected:
And with no regions selected:
Let me know if this helps.
Many Thanks,
Andrew