Chart based on pivot table selection in EJ2 TypeScript Pivotview control

2 May 202310 minutes to read

The cell selection support is enabled using the allowSelection property and its type and mode are configured using the selectionSettings property. The cellSelected event gets fired on every selection operation performed in the pivot table. This event returns the selected cell informations, like row header name, column header name, measure name, and value. Based on this information, the chart control will be plotted.

index.ts

import { Chart, Category, Legend, Tooltip, ColumnSeries, LineSeries, SeriesModel } from '@syncfusion/ej2-charts';
import { PivotView, IDataSet, PivotCellSelectedEventArgs } from '@syncfusion/ej2-pivotview';
import { pivotData } from './datasource.ts';

let onInit: boolean = true;
let measureList: { [key: string]: string } = {};
let chart: Chart;
let selectedCells: CellSelectedObject[];
let chartSeries: SeriesModel[];

let pivotObj: PivotView = new PivotView({
  dataSourceSettings: {
    dataSource: pivotData as IDataSet[],
    columns: [{ name: 'Year', caption: 'Production Year' }, { name: 'Quarter' }],
    values: [{ name: 'Sold', caption: 'Units Sold' }],
    rows: [{ name: 'Country' }, { name: 'Products' }],
    filters: []
  },
  width: '100%',
  height: 290,
  dataBound: () => {
        if (onInit) {
            for (let value of pivotObj.dataSourceSettings.values) {
                measureList[value.name] = value.caption || value.name;
            }
            pivotObj.grid.selectionModule.selectCellsByRange({ cellIndex: 1, rowIndex: 1 }, { cellIndex: 3, rowIndex: 3 });
        }
    },
    gridSettings: {
        allowSelection: true,
        selectionSettings: { mode: 'Both', type: 'Multiple', cellSelectionMode: 'Box' }
    },
    cellSelected: (args: PivotCellSelectedEventArgs) => {
        selectedCells = args.selectedCellsInfo;
        if (selectedCells && selectedCells.length > 0) {
            chartSeries = frameChartSeries();
            chartUpdate();
        }
    }
});
pivotObj.appendTo('#PivotTable');

function frameChartSeries(): SeriesModel[] {
    let columnGroupObject: { [key: string]: { x: string, y: number }[] } = {};
    for (let cell of selectedCells) {
      if (cell.measure !== '') {
        let columnSeries = (pivotObj.dataSourceSettings.values.length > 1 && measureList[cell.measure]) ?
        (cell.columnHeaders.toString() + ' ~ ' + measureList[cell.measure]) : cell.columnHeaders.toString();
        if (columnGroupObject[columnSeries]) {
          columnGroupObject[columnSeries].push({ x: cell.rowHeaders == '' ? 'Grand Total' : cell.rowHeaders.toString(), y: Number(cell.value) });
        } else {
          columnGroupObject[columnSeries] = [{ x: cell.rowHeaders == '' ? 'Grand Total' : cell.rowHeaders.toString(), y: Number(cell.value) }];
        }
      }
    }
    let columnKeys: string[] = Object.keys(columnGroupObject);
    let chartSeries: SeriesModel[] = [];
    for (let key of columnKeys) {
        chartSeries.push({
            dataSource: columnGroupObject[key],
            xName: 'x',
            yName: 'y',
            type: 'Column',
            name: key
        });
    }
    return chartSeries;
}

function chartUpdate() {
    if (onInit) {
        onInit = false;
        Chart.Inject(ColumnSeries, LineSeries, Legend, Tooltip, Category);
        chart = new Chart({
            title: 'Sales Analysis',
            legendSettings: {
                visible: true
            },
            tooltip: {
                enable: true
            },
            primaryYAxis: {
                title: pivotObj.dataSourceSettings.values.map(function (args) { return args.caption || args.name }).join(' ~ '),
            },
            primaryXAxis: {
                valueType: 'Category',
                title: pivotObj.dataSourceSettings.rows.map(function (args) { return args.caption || args.name }).join(' ~ '),
                labelIntersectAction: 'Rotate45'
            },
            series: chartSeries,
        }, '#Chart');
    } else {
        chart.series = chartSeries;
        chart.primaryXAxis.title = pivotObj.dataSourceSettings.rows.map(function (args) { return args.caption || args.name }).join(' ~ ');
        chart.primaryYAxis.title = pivotObj.dataSourceSettings.values.map(function (args) { return args.caption || args.name }).join(' ~ ');
        chart.refresh();
    }
}

index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Pivot Grid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Pivot Grid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-calendars/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/ej2-pivotview/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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='PivotTable'></div>
        <br />
        <div id='Chart'></div>
    </div>
</body>

</html>