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Aggregates in JavaScript Tree Grid control

Aggregate values are displayed in the TreeGrid footer and in parent row footer for child row aggregate values. It can be configured through aggregates property. field and type are the minimum properties required to represent an aggregate column.

To use the aggregate feature, you have to inject the Aggregate module.

By default, the aggregate value can be displayed in the treegrid footer, and footer of child rows. To show the aggregate value in one of the cells, use the footerTemplate.

Built-in aggregate types

The aggregate type should be specified in the type property to configure an aggregate column.

The built-in aggregates are,

  • Sum
  • Average
  • Min
  • Max
  • Count
  • Truecount
  • Falsecount
  • Multiple aggregates can be used for an aggregate column by setting the type property with an array of aggregate types.
  • Multiple types for a column is supported only when one of the aggregate templates is used.

Footer aggregate value is calculated for all the rows, and it is displayed in the footer cells. Use the footerTemplate property to render the aggregate value in footer cells.

Source
Preview
index.ts
index.html
import { TreeGrid, Aggregate } from '@syncfusion/ej2-treegrid';
import { summaryRowData } from './datasource.ts';

TreeGrid.Inject(Aggregate);

let treeGridObj: TreeGrid = new TreeGrid(
    {
        dataSource: summaryRowData,
        childMapping: 'children',
        treeColumnIndex: 0,
        height: 260,
        columns: [
            { field: 'FreightID', headerText: 'Freight ID', width: 130 },
            { field: 'FreightName', width: 195, headerText: 'Freight Name' },
            { field: 'UnitWeight', headerText: 'Weight Per Unit', type: 'number', width: 130, textAlign: 'Right' },
            { field: 'TotalUnits', headerText: 'Total Units', type: 'number', width: 125, textAlign: 'Right' }
        ],
        aggregates: [{
            showChildSummary: false,
            columns: [
                {
                    type: 'Max',
                    field: 'UnitWeight',
                    columnName: 'UnitWeight',
                    footerTemplate: 'Maximum: ${Max}'
                },
                {
                type: 'Min',
                field: 'TotalUnits',
                columnName: 'TotalUnits',
                footerTemplate: 'Minimum: ${Min}'
            }]
        }]
    });
treeGridObj.appendTo('#TreeGrid');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Grid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>        
    </div>
</body>
</html>

The aggregate values must be accessed inside the template using their corresponding type name.

Child aggregate

Aggregate value is calculated for child rows, and it is displayed in the parent row footer. Use the childSummary property to render the child rows aggregate value.

Source
Preview
index.ts
index.html
import { TreeGrid, Aggregate } from '@syncfusion/ej2-treegrid';
import { summaryRowData } from './datasource.ts';

TreeGrid.Inject(Aggregate);

let treeGridObj: TreeGrid = new TreeGrid(
    {
        dataSource: summaryRowData,
        childMapping: 'children',
        treeColumnIndex: 0,
        height: 260,
        columns: [
            { field: 'FreightID', headerText: 'Freight ID', width: 130 },
            { field: 'FreightName', width: 195, headerText: 'Freight Name' },
            { field: 'UnitWeight', headerText: 'Weight Per Unit', type: 'number', width: 130, textAlign: 'Right' },
            { field: 'TotalUnits', headerText: 'Total Units', type: 'number', width: 125, textAlign: 'Right' }
        ],
        aggregates: [{
            showChildSummary: true,
            columns: [
                {
                    type: 'Max',
                    field: 'UnitWeight',
                    columnName: 'UnitWeight',
                    footerTemplate: 'Maximum: ${Max}'
                },
                {
                type: 'Min',
                field: 'TotalUnits',
                columnName: 'TotalUnits',
                footerTemplate: 'Minimum: ${Min}'
            }]
        }]
    });
treeGridObj.appendTo('#TreeGrid');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Grid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>        
    </div>
</body>
</html>

How to format aggregate value

You can format the aggregate value result by using the format property.

Source
Preview
index.ts
index.html
import { TreeGrid, Aggregate } from '@syncfusion/ej2-treegrid';
import { summaryData } from './datasource.ts';

TreeGrid.Inject(Aggregate);

let treeGridObj: TreeGrid = new TreeGrid(
    {
        dataSource: summaryData,
        childMapping: 'subtasks',
        treeColumnIndex: 0,
        height: 260,
        columns: [
            { field: 'category', headerText: 'Category', width: 160 },
            { field: 'units', headerText: 'Total Units', width: 130, type: 'number', textAlign: 'Right' },
            { field: 'unitPrice', headerText: 'Unit Price($)', width: 110, type: 'number', format: 'C2', textAlign: 'Right' },
            { field: 'price', headerText: 'Price($)', width: 160, textAlign: 'Right', type: 'number', format: 'C2' },
        ],
        aggregates: [{
            columns: [
                {
                    type: 'Sum',
                    field: 'price',
                    columnName: 'price',
                    format: 'C2',
                    footerTemplate: 'Total: ${Sum}'
                }]
        }]
    });
treeGridObj.appendTo('#TreeGrid');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Grid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>        
    </div>
</body>
</html>

Custom aggregate

To calculate the aggregate value with your own aggregate functions, use the custom aggregate option. To use custom aggregation, specify the type as Custom, and provide the custom aggregate function in the customAggregate property.

Source
Preview
index.ts
index.html
import { TreeGrid, Aggregate } from '@syncfusion/ej2-treegrid';
import { summaryData } from './datasource.ts';
import { getObject, CustomSummaryType } from '@syncfusion/ej2-grids';

let customAggregateFn: CustomSummaryType = (data: Object): number => {
    let sampleData: Object[] = getObject('result', data);
    let countLength: number; countLength = 0;
    sampleData.filter((item: Object) => {
        let data: string = getObject('category', item);
        if (data === 'Frozen seafood') {
            countLength++;
        }
    });
    return countLength;
};

TreeGrid.Inject(Aggregate);

let treeGridObj: TreeGrid = new TreeGrid(
    {
        dataSource: summaryData,
        childMapping: 'subtasks',
        width: 'auto',
        height: 245,
        treeColumnIndex: 1,
        columns: [
            { field: 'category', headerText: 'Category', width: 200 },
            { field: 'units', headerText: 'Total Units', width: 130, type: 'number', textAlign: 'Right' },
            { field: 'unitPrice', headerText: 'Unit Price($)', width: 110, type: 'number', format: 'C2', textAlign: 'Right' },
            { field: 'price', headerText: 'Price($)', width: 110, textAlign: 'Right', type: 'number', format: 'C' },
        ],
        aggregates: [{
            showChildSummary: false,
            columns: [{
                type: 'Custom',
                customAggregate: customAggregateFn,
                columnName: 'category',
                footerTemplate: 'Count of Frozen seafood : ${Custom}'
            }]
        }]
    });
treeGridObj.appendTo('#TreeGrid');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Grid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>        
    </div>
</body>
</html>

To access the custom aggregate value inside the template, use the key as Custom.

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