Working with Data in JavaScript Chart control

06 Jun 2023 / 6 minutes to read

Chart can visualise data bound from local or remote data.

Local Data

You can bind a simple JSON data to the chart using dataSource property in series. Now map the fields in JSON to xName and yName properties.

Source

Preview

index.ts

index.html

import { Chart, ColumnSeries, Category } from '@syncfusion/ej2-charts';
Chart.Inject(ColumnSeries, Category);
let chartData: any[] = [
      { month: 'Jan', sales: 35 }, { month: 'Feb', sales: 28 },
      { month: 'Mar', sales: 34 }, { month: 'Apr', sales: 32 },
      { month: 'May', sales: 40 }, { month: 'Jun', sales: 32 },
      { month: 'Jul', sales: 35 }, { month: 'Aug', sales: 55 },
      { month: 'Sep', sales: 38 }, { month: 'Oct', sales: 30 },
      { month: 'Nov', sales: 25 }, { month: 'Dec', sales: 32 }
];
let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'Category'
    },
    series:[{
        dataSource: chartData,
        xName: 'month',
        yName: 'sales',
        type: 'Column'
    }]
}, '#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>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Remote Data

You can also bind remote data to the chart using DataManager. The DataManager requires minimal information like webservice URL, adaptor and crossDomain to interact with service endpoint properly. Assign the instance of DataManager to the dataSource property in series and map the fields of data to xName and yName properties. You can also use the query property of the series to filter the data.

Source

Preview

index.ts

index.html

import { Chart, ColumnSeries, Category } from '@syncfusion/ej2-charts';
import { DataManager, Query } from '@syncfusion/ej2-data';
Chart.Inject(ColumnSeries, Category);
let dataManager: DataManager = new DataManager({
    url: 'http://mvc.syncfusion.com/Services/Northwnd.svc/Tasks/'
});
let query: Query = new Query().take(5).where('Estimate', 'lessThan', 3, false);
let chart: Chart = new Chart({
        primaryXAxis: {
            valueType: 'Category',
            title: 'Assignee'
        },
        primaryYAxis:
        {
            title: 'Estimate',
            minimum: 0, maximum: 3, interval: 1
        },
        series: [
            {
                type: 'Column',
                dataSource: dataManager,
                xName: 'Assignee', yName: 'Estimate', query: query,
                name: 'In progress'
            }
        ],
        title: 'Sprint Task Analysis'
}, '#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>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Binding Data Using ODataAdaptor

OData is a standardized protocol for creating and consuming data. You can retrieve data from OData service using the DataManager. Refer to the following code example for remote Data binding using OData service.

Source

Preview

index.ts

index.html

import { Chart, ColumnSeries, Category } from '@syncfusion/ej2-charts';
import { DataManager, Query, ODataAdaptor } from '@syncfusion/ej2-data';
Chart.Inject(ColumnSeries, Category);
let dataManager: DataManager = new DataManager({
   url: 'https://js.syncfusion.com/ejServices/Wcf/Northwind.svc/Orders/?$top=7',
   adaptor: new ej.data.ODataAdaptor()
});
let query: Query = new ej.data.Query();

let chart: Chart = new Chart({
         primaryXAxis: {
            valueType: 'Category'
        },
        //Initializing Chart Sample
        series: [
            {
                type: 'Column',
                dataSource: data,
                xName: 'CustomerID', yName: 'Freight', query: query,
            }
        ],
        title: 'Sprint Task Analysis'
}, '#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>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Lazy loading

Lazy loading allows you to load data for chart on demand. Chart will fire the scrollEnd event, in that we can get the minimum and maximum range of the axis, based on this, we can upload the data to chart.

Source

Preview

index.ts

index.html

import { Chart,ScrollBar, Zoom, IScrollEventArgs, LineSeries, Tooltip , DateTime} from '@syncfusion/ej2-charts';
import { Internationalization, DateFormatOptions } from '@syncfusion/ej2-base';
Chart.Inject(DateTime, ScrollBar, Zoom, LineSeries, Tooltip);

let intl: Internationalization = new Internationalization();
let chart: Chart = new Chart({
          primaryXAxis: {
            title: 'Day',
            valueType: 'DateTime',
            edgeLabelPlacement: 'Shift',
            skeleton: 'yMMM',
            skeletonType: 'Date',
            scrollbarSettings: {
                range: {
                    minimum: new Date(2009, 0, 1),
                    maximum: new Date(2014, 0, 1)
                },
                enable: true,
            }
        },
        primaryYAxis: {
            title: 'Server Load',
            labelFormat: '{value}MB'
        },
        series: [{
            dataSource: GetDateTimeData(new Date(2009, 0, 1), new Date(2009, 8, 1)),
            xName: 'x', yName: 'y',
            type: 'Line', animation: { enable: false },
        }],
        height: '450',
        title: 'Network Load',
        crosshair: { enable: true, lineType: 'Vertical' },
        tooltip: { enable: true, shared: true },
        legendSettings: { visible: true },
        scrollEnd: (args: IScrollEventArgs) => {
            if (lazymode.value === 'Range') {
                chart.series[0].dataSource = GetDateTimeData(args.currentRange.minimum as Date, args.currentRange.maximum as Date);
            }
            chart.dataBind();
        },
    });
}, '#element');

function GetDateTimeData(start: Date, end: Date): {x: Date, y: number}[] {
        let series1: {x: Date, y: number}[] = [];
        let date: number;
        let value: number = 30;
        let option: DateFormatOptions = {
            skeleton: 'full',
            type: 'dateTime'
        };

        let dateParser: Function = intl.getDateParser(option);
        let dateFormatter: Function = intl.getDateFormat(option);
        for (let i: number = 0; start <= end; i++) {
            date = Date.parse(dateParser(dateFormatter(start)));
            if (Math.random() > .5) {
                value += (Math.random() * 10 - 5);
            } else {
                value -= (Math.random() * 10 - 5);
            }
            if (value < 0) {
                value = getRandomInt(20, 40);
            }
            let point1: {x: Date, y: number} = { x: new Date(date), y: Math.round(value) };
            new Date(start.setDate(start.getDate() + 1));
            series1.push(point1);
        }
        return series1;
    }    function getRandomInt(min: number, max: number): number {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }

<!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>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Empty points

The Data points that uses the null or undefined as value are considered as empty points. Empty data points are ignored and not plotted in the Chart. When the data is provided by using the points property, By using emptyPointSettings property in series, you can customize the empty point. Default mode of the empty point is Gap.

Source

Preview

index.ts

index.html

import { Chart, ColumnSeries, LineSeries, Category } from '@syncfusion/ej2-charts';
Chart.Inject(ColumnSeries, LineSeries, Category);
let chartData: any[] = [
      { month: 'Jan', sales: 35 }, { month: 'Feb', sales: 28 },
      { month: 'Mar', sales: null }, { month: 'Apr', sales: 32 },
      { month: 'May', sales: 40 }, { month: 'Jun', sales: 32 },
      { month: 'Jul', sales: 35 }, { month: 'Aug', sales: undefined },
      { month: 'Sep', sales: 38 }, { month: 'Oct', sales: 30 },
      { month: 'Nov', sales: 25 }, { month: 'Dec', sales: 32 }
];
let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'Category'
    },
    series:[{
        dataSource: chartData,
        xName: 'month',
        yName: 'sales',
        type: 'Column',
        emptyPointSettings: {
            mode: 'Gap'
        }
    },
    {
        dataSource: chartData,
        xName: 'month',
        yName: 'sales',
        type: 'Line',
        marker: { visible: true},
        emptyPointSettings: {
            mode: 'Average'
        }
    }]
}, '#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>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Customizing empty point

Specific color for empty point can be set by fill property in emptyPointSettings. Border for a empty point can be set by border property.

Source

Preview

index.ts

index.html

import { Chart, ColumnSeries, LineSeries Category } from '@syncfusion/ej2-charts';
Chart.Inject(ColumnSeries, LineSeries, Category);
let chartData: any[] = [
      { month: 'Jan', sales: 35 }, { month: 'Feb', sales: 28 },
      { month: 'Mar', sales: null }, { month: 'Apr', sales: 32 },
      { month: 'May', sales: 40 }, { month: 'Jun', sales: 32 },
      { month: 'Jul', sales: 35 }, { month: 'Aug', sales: undefined },
      { month: 'Sep', sales: 38 }, { month: 'Oct', sales: 30 },
      { month: 'Nov', sales: 25 }, { month: 'Dec', sales: 32 }
];
let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'Category'
    },
    series:[{
        dataSource: chartData,
        xName: 'month',
        yName: 'sales',
        type: 'Column',
        emptyPointSettings: {
            mode: 'Average',
            fill: 'green',
            border: { color: 'black', width: 2}
        }
    },
    {
        dataSource: chartData,
        xName: 'month',
        yName: 'sales',
        type: 'Line',
        marker: { visible: true},
        emptyPointSettings: {
            mode: 'Zero',
            fill: 'pink'
        }
    }]
}, '#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>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Contents

Local Data
Remote Data
Binding Data Using ODataAdaptor
Lazy loading
Empty points

Contents

Local Data
Remote Data
Binding Data Using ODataAdaptor
Lazy loading
Empty points