You can calculate the aggregate value with your own aggregate functions. To use custom aggregation, specify the type
as Custom
, and provide the custom aggregate function in the customAggregate
property.
In this below demo, we have show the count of distinct value for ShipCountry
column by using custom aggregate.
import { Grid, Page, Aggregate } from '@syncfusion/ej2-grids';
import { data } from './datasource.ts';
import { DataManager, Query, DataUtil } from '@syncfusion/ej2-data';
Grid.Inject(Page, Aggregate );
let customAggregateFn = function() {
let results = new DataManager(this.currentViewData).executeLocal(new Query().select(['ShipCountry']));
let distinct = DataUtil.distinct(results, 'ShipCountry', true);
return distinct.length;
}
let grid: Grid = new Grid({
dataSource: data,
allowPaging: true,
columns: [
{ field: 'OrderID', headerText: 'Order ID', textAlign: 'Right', width: 120, type: 'number' },
{ field: 'CustomerID', width: 140, headerText: 'Customer ID', type: 'string' },
{ field: 'Freight', headerText: 'Freight', textAlign: 'Right', width: 120, format: 'C2' },
{ field: "ShipCountry", headerText: "Ship Country", width: 150 }
],
height: 220,
aggregates: [{
columns: [{
type: 'Custom',
customAggregate: customAggregateFn,
columnName: 'ShipCountry',
footerTemplate: 'Distinct Count: ${Custom}'
}]
}]
});
grid.appendTo('#Grid');
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<head>
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