How can I count the values in the selected field of a field parameter?

[djallarii]

I have a field parameter created for use in a line chart to display data on the x-axis by calendar quarter, month, week, or day.

Date Axis Display = {

    ("Quarter", NAMEOF('v_dim_date'[calendar_year_qtr]), 0),

    ("Month", NAMEOF('v_dim_date'[calendar_year_mth]), 1),

    ("Week", NAMEOF('v_dim_date'[calendar_year_wk]), 2),

    ("Day", NAMEOF('v_dim_date'[calendar_day]), 3)

}

I see that I can change a field parameter from "Show selected field" to "Show selected values of field" and it's that list of values I would like to count, the "selected values of field."

For example, using time period Jan 1, 2022 to Dec 31, 2022, counting the selected values of each field paramater option should give me the following results:

Quarter = 4

Month = 12

Week = 52

Day = 365

Using time period August 1, 2023 to Oct 31, 2023, the counts should result in these results:

Quarter = 2

Month = 3

Week = 14

Day = 92

[djallarii · Accepted solution]

I just figured this one out

count_field =

var __selection = SELECTEDVALUE('Date Axis Display'[Date Axis Display Order])

return

SWITCH(

    __selection,

    0, DISTINCTCOUNT(v_dim_date[calendar_year_qtr]),

    1, DISTINCTCOUNT(v_dim_date[calendar_year_mth]),

    2, DISTINCTCOUNT(v_dim_date[calendar_year_wk]),

    3, DISTINCTCOUNT(v_dim_date[calendar_date])

)