Angular DataGrid - headerFilter
Configures the header filter feature.
A header filter allows a user to filter values in an individual column by including/excluding them in/from the applied filter. A click on a header filter icon invokes a popup menu with all unique values in the column. By selecting or clearing the selection of values in this menu, the user includes/excludes them in/from the filter.

To make header filter icons visible, assign true to the headerFilter.visible option. Data in the popup menu can be customized using the headerFilter option of a specific column.
See Also
allowSearch
Specifies whether searching is enabled in the header filter.
height
Specifies the height of the popup menu that contains values for filtering.
searchTimeout
Specifies a delay in milliseconds between when a user finishes typing in the header filter's search panel, and when the search is executed.