Stacked step area Chart in EJ2 TypeScript control

14 Dec 202424 minutes to read

Stacked step area

To render a stacked step area series in your chart, you need to follow a few steps to configure it correctly. Here’s a concise guide on how to do this:

Set the series type: Define the series type as StackingStepArea in your chart configuration. This indicates that the data should be represented as a stacked step area chart, which is a combination of a stacked area chart and a step area chart. It connects the data points with vertical and horizontal lines, creating a step like appearance.
Inject the StackingStepAreaSeries module: Use the Chart.Inject(StackingStepAreaSeries) method to inject the StackingStepAreaSeries module into your chart. This step is essential, as it ensures that the necessary functionalities for rendering stacked step area series are available in your chart.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others'
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Binding data with series

You can bind data to the chart using the dataSource property within the series configuration. This allows you to connect a JSON dataset or remote data to your chart. To display the data correctly, map the fields from the data to the chart series xName and yName properties.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others'
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Series customization

The following properties can be used to customize the stacked step area series.

Fill

The fill property determines the color applied to the series.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic', fill: '#ff4251'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade', fill: '#4C4C4C'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others', fill: '#794F1B'
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

The fill property can be used to apply a gradient color to the stacked step area series. By configuring this property with gradient values, you can create a visually appealing effect in which the color transitions smoothly from one shade to another.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic', fill: 'url(#gradient1)'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade', fill: 'url(#gradient2)'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others', fill: 'url(#gradient3)'
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
    <svg style="width:1px; height:1px">
        <defs>
            <linearGradient id="gradient1">
                <stop offset="0%" style="stop-color:darkviolet;stop-opacity:5" />
                <stop offset="50%" style="stop-color:darkgoldenrod;stop-opacity:5" />
            </linearGradient>
        </defs>
    </svg>
    
    <svg style="width:1px; height:1px">
        <defs>
            <linearGradient id="gradient2">
                <stop offset="0%" style="stop-color:darkred;stop-opacity:5" />
                <stop offset="50%" style="stop-color:darkorange;stop-opacity:5" />
            </linearGradient>
        </defs>
    </svg>
    
    <svg style="width:1px; height:1px">
        <defs>
            <linearGradient id="gradient3">
                <stop offset="0%" style="stop-color:darkmagenta;stop-opacity:5" />
                <stop offset="50%" style="stop-color:darkcyan;stop-opacity:5" />
            </linearGradient>
        </defs>
    </svg>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Opacity

The opacity property specifies the transparency level of the fill. Adjusting this property allows you to control how opaque or transparent the fill color of the series appears.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic', opacity: 0.7
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade', opacity: 0.7
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others', opacity: 0.7
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Border

Use the border property to customize the width, color and dasharray of the series border.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic',
            border: { width: 2, color: '#ff4251', dashArray: '5,5' }
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade',
            border: { width: 2, color: '#4C4C4C', dashArray: '5,5' }
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others',
            border: { width: 2, color: '#794F1B', dashArray: '5,5' }
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Step

Use the step property to change the position of the steps in a stacked step area series.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic', step: 'Center'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade', step: 'Center'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others', step: 'Center'
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

No risers

You can eliminate the vertical lines between points by using the noRisers property in a series. This approach is useful for highlighting trends without the distraction of risers.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y', opacity: 0.1, border: {width:1.5},
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic',  noRisers: true
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',opacity: 0.1, border: {width:1.5},
            type: 'StackingStepArea', name: 'Others',  noRisers: true
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Empty points

Data points with null or undefined values are considered empty. Empty data points are ignored and not plotted on the chart.

Mode

Use the mode property to define how empty or missing data points are handled in the series. The default mode for empty points is Gap.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic',
            emptyPointSettings: { mode: 'Average' }
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others',
            emptyPointSettings: { mode: 'Gap' }
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: null, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: undefined },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Fill

Use the fill property to customize the fill color of empty points in the series.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic',
            emptyPointSettings: { mode: 'Gap' }
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others',
            marker: { visible: true, width: 7, height: 7, isFilled: true },
            emptyPointSettings: { mode: 'Average', fill: 'red' }
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: null, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: undefined },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Border

Use the border property to customize the width and color of the border for empty points.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic',
            emptyPointSettings: { mode: 'Gap' }
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others',
            marker: { visible: true, width: 7, height: 7, isFilled: true },
            emptyPointSettings: { mode: 'Average', fill: 'red', border: { width: 2, color: 'green'} }
        }
    ],
    title: 'Trend in Sales of Ethical Produce'
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: null, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: undefined },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Events

Series render

The seriesRender event allows you to customize series properties, such as data, fill, and name, before they are rendered on the chart.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend, ISeriesRenderEventArgs } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade'
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others'
        }
    ],
    title: 'Trend in Sales of Ethical Produce',
    seriesRender: (args: ISeriesRenderEventArgs) => {
        if (args.series.index === 0) {
            args.fill = '#ff4251';
        }
        else if (args.series.index === 1) {
            args.fill = '#4C4C4C';
        }
        else if (args.series.index === 2) {
            args.fill = '#794F1B';
        }
    }
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Point render

The pointRender event allows you to customize each data point before it is rendered on the chart.

index.ts
index.html
datasource.ts
import { Chart, StackingStepAreaSeries, Legend, IPointRenderEventArgs } from '@syncfusion/ej2-charts';
import { stackedData } from './datasource.ts';
Chart.Inject(StackingStepAreaSeries, Legend);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Years',
        edgeLabelPlacement: 'Shift',
        majorTickLines: { width: 0 }
    },
    primaryYAxis:
    {
        title: 'Spend in Billions',
        minimum: 0,
        maximum: 4,
        interval: 1,
        labelFormat: '{value}B',
        majorTickLines: { width: 0 }
    },
    series: [
        {
            dataSource: stackedData, xName: 'x', yName: 'y',
            //Series type as stacked area series
            type: 'StackingStepArea', name: 'Organic',
            marker: { visible: true, width: 7, height: 7, isFilled: true }
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y1',
            type: 'StackingStepArea', name: 'Fair-trade',
            marker: { visible: true, width: 7, height: 7, isFilled: true }
        },
        {
            dataSource: stackedData, xName: 'x', yName: 'y2',
            type: 'StackingStepArea', name: 'Others',
            marker: { visible: true, width: 7, height: 7, isFilled: true }
        }
    ],
    title: 'Trend in Sales of Ethical Produce',
    pointRender: (args: IPointRenderEventArgs) => {
        if (args.point.index % 2 !== 0) {
            args.fill = '#ff6347';
        }
        else {
            args.fill = '#009cb8';
        }
    }
}, '#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="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='element'></div>
    </div>
</body>

</html>
export let stackedData: Object[] = [
    { x: 2000, y: 0.61, y1: 0.03, y2: 0.48},
    { x: 2001, y: 0.81, y1: 0.05, y2: 0.53 },
    { x: 2002, y: 0.91, y1: 0.06, y2: 0.57 },
    { x: 2003, y: 1,    y1: 0.09, y2: 0.61 }, 
    { x: 2004, y: 1.19, y1: 0.14, y2: 0.63 },
    { x: 2005, y: 1.47, y1: 0.20, y2: 0.64 },
    { x: 2006, y: 1.74, y1: 0.29, y2: 0.66 }, 
    { x: 2007, y: 1.98, y1: 0.46, y2: 0.76 },
    { x: 2008, y: 1.99, y1: 0.64, y2: 0.77 },
    { x: 2009, y: 1.70, y1: 0.75, y2: 0.55 }
];

Stacked step area Chart in EJ2 TypeScript control