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Aggregates
The Grid enables you to display aggregated number results when the user groups its data.
To enable grouping by using aggregate functions, use the aggregates, groupFooterTemplate, groupHeaderColumnTemplate, or footerTemplate settings of the Grid and the group and aggregate fields of its data source. For a runnable example, refer to the demo on using aggregate functions in the Grid.
Known Limitations
The columns.aggregates configuration needs to be included if the Grid has its groupable property enabled, otherwise the groupFooterTemplate and groupHeaderTemplate won't function properly.