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Aggregates on remote datasource

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john
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john asked on 19 Nov 2013, 04:15 PM
I am trying to display a simple chart from remote data, but I'm having trouble with aggregates.  For a table of people, I'd like to see a bar chart that shows the number of people in each role.  I think the bottom-line question is, "where are the aggregates calculated?"  Does the framework calculate them on the client side after the data has been returned from the server?  In my ASPNet MVC controller, I can see the expected Kendo.Mvc.GroupDescriptor list and the Kendo.Mvc.IFilterDescriptor list populated correctly, but the Kendo.Mvc.AggregateDescriptor list is empty.  Should it be?  Also, the AggregateFunctions collection in the GroupDescriptor is also empty.  Please advise.

var myDataSource = new kendo.data.DataSource({
        transport: {
            prefix: "",
            read: {
                url: "/Team/TeamMembers",
                type: "POST"
            }
        },
        group: {
            field: "personRole",
            aggregates: [{
                field: "personId",
                aggregate: "count"
            }]
        }
}

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Petur Subev
Telerik team
answered on 21 Nov 2013, 10:57 AM
Hello John,

The following part from the documentation clearly answers your main question:

http://docs.kendoui.com/api/framework/datasource#configuration-serverAggregates

"By default the data source calculates aggregates client-side."

However when using the MVC Wrappers for widgets like the Grid, the aggregates are calculated on the server by default (you can change this by the dataSource configuration ServerOperation(false) ) with the help of the Kendo extension methods such As ToDataSourceResult.

Also if using the MVC Kendo Extensions I would suggest you to follow the MVC documentation topic, there are scripts that need to be included.

Kind Regards,
Petur Subev
Telerik
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