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Customizing grouping using GroupingField.groupingFunction in GroupingCollection

The sample uses fictitious data of web site visitors by age and location. The example uses COUNT summary option to show how many visitors exist in each group.

The only thing to remember while writing a groupingFunction is that the return value should not change the sorting order being used for the dataField. Another way to put it is, the groupingFunction should return group names in a sorted order only. It shouldnot return group names in a random fashion.


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