Hi @D_PBI ,
Power BI does not natively offer the ability to apply a Top N filter directly at the page level in the same way it does at the visual level. However, there are effective ways to achieve a similar result by using DAX measures or calculated tables, combined with slicers to dynamically control the Top N filtering across an entire page.
One way to achieve this is by creating a dynamic Top N slicer that can be applied across all visuals on the page. First, you need to create a parameter table to act as the slicer. You can do this by adding a new table in the Power BI model using the following DAX expression: TopN_Parameter = GENERATESERIES(1, 10, 1). This table will provide a list of numbers from 1 to 10, representing the Top N values that users can select through a slicer.
Once the parameter table is created, you need to define a measure that will dynamically calculate the Top N based on the slicer selection. The measure can be written as follows:
Top N Sales =
VAR TopNValue = SELECTEDVALUE(TopN_Parameter[Value], 5)
RETURN
CALCULATE(
[Total Sales],
FILTER(
ALL('YourTable'),
RANKX(ALL('YourTable'), [Total Sales]) <= TopNValue
)
)
This measure calculates the rank of each entry in your dataset and filters the data to show only those entries that fall within the selected Top N range. The measure can then be used in your visuals to ensure they dynamically adjust based on the slicer selection.
Another approach is to create a calculated table that filters the dataset to only include the Top N records based on a selected measure. You can create this table by entering the following DAX expression in a new calculated table:
TopN_Table =
VAR TopNValue = SELECTEDVALUE(TopN_Parameter[Value], 5)
RETURN
TOPN(TopNValue, 'YourTable', [Total Sales], DESC)
This calculated table will only contain the top entries based on the selected value from the slicer. Using this table as the data source for your visuals ensures that only the desired Top N entries are displayed across the entire report page.
If you want to use a simpler approach that does not rely on slicers, you can create a calculated column using the RANKX function to rank the entries in your table. This column can then be used as a page-level filter. For instance, you could create a calculated column with the following DAX expression:
Rank = RANKX(ALL('YourTable'), [Total Sales], , DESC)
Once the column is created, you can go to the “Filters on this page” section in Power BI and apply a filter to show only rows where the Rank value is less than or equal to your desired Top N value. This will limit the data displayed across all visuals on the page to the top-ranked entries.
The best method depends on your specific use case. If you need a dynamic solution that allows users to control the Top N filtering through a slicer, the first method using a dynamic measure is highly recommended. If you want a more static filter that applies across the entire page without user interaction, using a calculated column with RANKX and a page-level filter is simpler to implement. Alternatively, if you need to limit the entire data model to only the Top N records, using a calculated table is an effective approach, though it may be performance-heavy for large datasets.
Best regards,
