https://jsdoc.moodledev.io/5.01/module-core_datafilter_filtertype.html
module:core/datafilter/filtertype - Documentation
modulecoredatafilterdocumentation
https://www.openoffice.org/api/docs/common/ref/com/sun/star/chart2/data/DataFilter.html
Service DataFilter
servicedatafilter
https://feedback.telerik.com/wpf/1354601-datafilter-add-an-option-to-hide-the-stringfiltereditor-when-the-filter-operator-is-isnull-or-isnotnull
DataFilter: Add an option to hide the StringFilterEditor when the filter operator is IsNull or...
https://developer.mescius.com/componentone/docs/win/online-datafilter/walkthrough/usingdatagridwithflexgrid
Using DataFilter with FlexGrid
Learn how to use filtering UI similar to the one seen in e-commerce websites with FlexGrid displaying the product listing.
usingdatafilterflexgrid