Power Bi：如何参数化 Top N 视觉级别过滤器

Question

Since PowerBI don't support Top N filter on page level , I want to use N as a parameter to change it at once per multiple visuals. Is it possible?

PSIn this video (9:15) solution for more complex case is provided.

In the end of this article sample file available

Answer 1

Using the sample dataset, insert a new parameter.

Add a measure as follows:

Measure = 
IF(
    SELECTEDVALUE('Product'[Product Name]) IN 
    SELECTCOLUMNS( 
        TOPN(
            [Parameter Value], 
            ADDCOLUMNS( ALL( 'Product'),"@Sales", [Sales Amount] ), 
            [@Sales]
            ), 
        "x", 
        'Product'[Product Name]), 
1)

Every visual you want affected by the TopN should have this filter.

That's it.

Answer 2

From usability perspective it's preferable to return Sales Rank in measure.

Solution below is a copy/paste from SQLBI experts solution with minimal code changes ( ALLSELECTED ( 'Product'[Product Name] ) replaced by ALLSELECTED ( 'Product' ) ):

rnkSales = 
IF (
    ISINSCOPE ( 'Product'[Product Name] ),
    VAR ProductsToRank = [TopN Value]
    VAR SalesAmount = [Sales Amount]
    RETURN
        IF (
            SalesAmount > 0,
            VAR VisibleProducts = 
                CALCULATETABLE (
                     VALUES ( 'Product' ),
                     ALLSELECTED ( 'Product') //ALLSELECTED ( 'Product'[Product Name] )
                )
            VAR Ranking =
                RANKX (
                    VisibleProducts,                    
                    [Sales Amount],
                    SalesAmount
                )
            RETURN
                IF (
                    Ranking > 0 && Ranking <= ProductsToRank,
                    Ranking
                )
        )
)