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Grouping

You can club/group few points of the series based on groupTo property. For example, if the club value is 11, then the points with value less than 11 is grouped together and will be showed as a single point with label others. The property also takes value in percentage (percentage of total data points value).

Source
Preview
index.js
index.html
var piechart = new ej.charts.AccumulationChart({
    series: [
        {
            dataSource: [
                { x: 'Jan', y: 3, text: 'Jan: 3' }, { x: 'Feb', y: 3.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: 7, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' },
                { x: 'May', y: 19, text: 'May: 19' }, { x: 'Jun', y: 23.5, text: 'Jun: 23.5' },
                { x: 'Jul', y: 26, text: 'Jul: 26' }, { x: 'Aug', y: 25, text: 'Aug: 25' },
                { x: 'Sep', y: 21, text: 'Sep: 21' }, { x: 'Oct', y: 15, text: 'Oct: 15' },
                { x: 'Nov', y: 9, text: 'Nov: 9' }, { x: 'Dec', y: 3.5, text: 'Dec: 3.5' }],
            dataLabel: { visible: true, name: 'text', position: 'Outside'  },
            groupTo: '11',
            xName: 'x',
            yName: 'y'
        }
    ],
    textRender: (args: IAccTextRenderEventArgs) => {
        if (args.text.indexOf('Others') > -1) {
            args.color = 'red';
            args.border.width = 1;
        }
    },
    pointRender: (args: IAccPointRenderEventArgs) => {
        if ((args.point.x as string).indexOf('Others') > -1) {
            args.fill = '#D3D3D3';
        }
    },
}, '#element');
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    
    
<script src="//cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Group Mode

Slice can also be grouped based on number of points by specifying the groupMode to Point. For example, if the group to value is 11, accumulation chart will show 1st 11 points and will group remaining entries in the collection as a single point.

Source
Preview
index.js
index.html
var piechart = new ej.charts.AccumulationChart({
    series: [
        {
            dataSource: [
                { x: 'Jan', y: 3, text: 'Jan: 3' }, { x: 'Feb', y: 3.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: 7, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' },
                { x: 'May', y: 19, text: 'May: 19' }, { x: 'Jun', y: 23.5, text: 'Jun: 23.5' },
                { x: 'Jul', y: 26, text: 'Jul: 26' }, { x: 'Aug', y: 25, text: 'Aug: 25' },
                { x: 'Sep', y: 21, text: 'Sep: 21' }, { x: 'Oct', y: 15, text: 'Oct: 15' },
                { x: 'Nov', y: 9, text: 'Nov: 9' }, { x: 'Dec', y: 3.5, text: 'Dec: 3.5' }],
            dataLabel: { visible: true, name: 'text', position: 'Outside'  },
            groupTo: '4',
            groupMode : 'Point',
            xName: 'x',
            yName: 'y'
        }
    ],
    textRender: (args: IAccTextRenderEventArgs) => {
        if (args.text.indexOf('Others') > -1) {
            args.color = 'red';
            args.border.width = 1;
        }
    },
    pointRender: (args: IAccPointRenderEventArgs) => {
        if ((args.point.x as string).indexOf('Others') > -1) {
            args.fill = '#D3D3D3';
        }
    },
}, '#element');
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    
    
<script src="//cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Customization

You can customize the grouped point and its data label using pointRender and textRender event.

Source
Preview
index.js
index.html
var piechart = new ej.charts.AccumulationChart({
    series: [
        {
            dataSource: [
                { x: 'Jan', y: 3, text: 'Jan: 3' }, { x: 'Feb', y: 3.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: 7, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' },
                { x: 'May', y: 19, text: 'May: 19' }, { x: 'Jun', y: 23.5, text: 'Jun: 23.5' },
                { x: 'Jul', y: 26, text: 'Jul: 26' }, { x: 'Aug', y: 25, text: 'Aug: 25' },
                { x: 'Sep', y: 21, text: 'Sep: 21' }, { x: 'Oct', y: 15, text: 'Oct: 15' },
                { x: 'Nov', y: 9, text: 'Nov: 9' }, { x: 'Dec', y: 3.5, text: 'Dec: 3.5' }],
            dataLabel: { visible: true, name: 'text', position: 'Outside'  },
            groupTo: '11',
            xName: 'x',
            yName: 'y'
        }
    ],
    textRender: (args: IAccTextRenderEventArgs) => {
        if (args.text.indexOf('Others') > -1) {
            args.color = 'red';
            args.border.width = 1;
        }
    },
    pointRender: (args: IAccPointRenderEventArgs) => {
        if ((args.point.x as string).indexOf('Others') > -1) {
            args.fill = '#D3D3D3';
        }
    },
}, '#element');
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    
    
<script src="//cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>