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Reactive Aggregate in JavaScript Grid control

24 May 2022 / 3 minutes to read

Auto update aggregate value in batch editing

When using batch editing, the aggregate values will be refreshed on every cell save. The footer, group footer, and group caption aggregate values will be refreshed.

Adding a new record to the grouped grid will not refresh the aggregate values.

Source
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index.ts
index.html
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import { Grid, Aggregate, Edit, Toolbar, Group,Page } from '@syncfusion/ej2-grids';
import { data } from './datasource.ts';

Grid.Inject(Aggregate, Edit, Toolbar, Group, Page);

let grid: Grid = new Grid({
    dataSource: data,
    allowPaging:true,
    pageSettings:{pageSize:6},
    toolbar: ['Delete', 'Update', 'Cancel'],
    editSettings: { allowEditing: true, allowDeleting: true, mode: 'Batch' },
    allowGrouping: true,
    groupSettings: { showDropArea: false, columns: ['ShipCountry'] },
    columns: [
        { field: 'OrderID', headerText: 'Order ID', isPrimaryKey:true, textAlign: 'Right', width: 120 },
        { field: 'CustomerID', headerText: 'Customer ID', width: 150 },
        { field: 'Freight', headerText: 'Freight', width: 150, format: 'C2' },
        { field: 'ShipCountry', headerText: 'Ship Name', width: 150 }
    ],
    height: 268,
    aggregates: [{
        columns: [{
          type:'Sum',
          field:'Freight',
          format:'C2',
          footerTemplate:'Sum : ${Sum}'
        }]
    },
    {
        columns:[{
            type:'Sum',
            field:'Freight',
            format:'C2',
            groupCaptionTemplate:'Average : ${Average}'
        }]
    },
    {
        columns:[{
            type:'Sum',
            field:'Freight',
            format:'C2',
            groupFooterTemplate:'Sum : ${Sum}'
        }]
    }
    ]
});
grid.appendTo('#Grid');
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<!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/ej2/20.1.57/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/20.1.57/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='Grid'></div>

        <div id='toolbar-template'>
            <div id='refresh' title='Refresh'>
                <button class='e-btn e-flat'>
                    <span class= 'e-btn-icon e-icons e-refresh'></span>
                </button>
            </div>
        </div>
    </div>

</body>

</html>

Refresh aggregate values in inline editing

By default, reactive aggregate update is not supported by inline and dialog edit modes as it is not feasible to anticipate the value change event for every editor. But, you can refresh the aggregates manually in the inline edit mode using the refresh method of aggregate module.

In the following code, the input event for the Freight column editor has been registered and the aggregate value has been refreshed manually.

Source
Preview
index.ts
index.html
Copied to clipboard
import { Grid, Aggregate, Edit, Toolbar, Group, Page } from '@syncfusion/ej2-grids';
import { data } from './datasource.ts';

Grid.Inject(Aggregate, Edit, Toolbar, Group, Page);

let selectedRecord : Object = {};
let grid: Grid = new Grid({
    dataSource: data,
    allowPaging:true,
    pageSettings:{pageSize:7},
    toolbar: ['Delete', 'Update', 'Cancel'],
    editSettings: { allowEditing: true, allowDeleting: true, mode: 'Normal' },
    actionBegin:(args:any)=>{
        if(args.requestType === 'beginEdit'){
           selectedRecord ={};
           selectedRecord = args.rowData;
        };
    },
    columns: [
        { field: 'OrderID', headerText: 'Order ID', isPrimaryKey:true, textAlign: 'Right', width: 120 },
        { field: 'CustomerID', headerText: 'Customer ID', width: 150 },
        { field: 'Freight', headerText: 'Freight', editType: 'numericedit', format: 'C2', edit: { params: { change: (args :any) => {
            let gridObj = document.getElementById('Grid')['ej2_instances'][0];
            selectedRecord['Freight'] = args.value; // Set the edited value to aggregate column
            gridObj.aggregateModule.refresh(selectedRecord) // Refresh aggregates using edited data
            }
           }
        }, width: 150},
       { field: 'ShipCountry', headerText: 'Ship Name', width: 150 }
    ],
    height: 268,
    aggregates: [{
        columns:[{
          type:'Sum',
          field:'Freight',
          format:'C2',
          footerTemplate:'Sum : ${Sum}'
        }]
    }]
});
grid.appendTo('#Grid');
Copied to clipboard
<!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/ej2/20.1.57/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/ej2-calendars/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/20.1.57/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='Grid'></div>

        <div id='toolbar-template'>
            <div id='refresh' title='Refresh'>
                <button class='e-btn e-flat'>
                    <span class= 'e-btn-icon e-icons e-refresh'></span>
                </button>
            </div>
        </div>
    </div>

</body>

</html>
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