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Format Tooltip in JavaScript Chart control

20 Apr 2021 / 2 minutes to read

Using tooltipRender event, you can able to format the datetime value instead of rendered value.

To format the datetime value,please follow the steps below

Step 1:

By using tooltipRender event we can able to get the current point x value. Using this value to format the tooltip by using formatDate method.

The output will appear as follows,

Source
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index.ts
index.html
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import { Chart, LineSeries, DateTime,  ITooltipRenderEventArgs, DataLabel, Tooltip } from '@syncfusion/ej2-charts';
import { Internationalization } from '@syncfusion/ej2-base';
Chart.Inject(LineSeries, DateTime, DataLabel, Tooltip);
let chart: Chart = new Chart({

        //Initializing Primary X Axis
        primaryXAxis: {
            valueType: 'DateTime',
        },
        //Initializing Chart Series
        series: [
            {
                type: 'Line',
                dataSource: [
                    { x: new Date(2005, 0, 1), y: 21 }, { x: new Date(2006, 0, 1), y: 24 },
                    { x: new Date(2007, 0, 1), y: 30 }, { x: new Date(2008, 0, 1), y: 38 },
                    { x: new Date(2009, 0, 1), y: 54 }, { x: new Date(2010, 0, 1), y: 57 },
                ],
                xName: 'x', width: 2, marker: {
                  dataLabel : { visible: true },
                    visible: true,
                    width: 10,
                    height: 10
                },
                yName: 'y', name: 'Germany',
            }
        ],

       //Initializing Chart title
        title: 'Inflation - Consumer Price',
        tooltip: {enable: true},
        tooltipRender:(args: ITooltipRenderEventArgs) => {  //  To format the current point x value
        let intl: Internationalization = new Internationalization();
        let formattedString: string = intl.formatDate(new Date(args.point.x), { skeleton: 'yMd' });
        args.text = formattedString;
        };
    width:'650px',
    height: '350px'
},'#element');
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<!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="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" rel="stylesheet">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.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 class="col-sm-8">
            <div class="row">
                <div class="col-sm-4">  
                  <div id='container'>
                    <div id='element'  style="width:350px; height:350px;float:left">
                    </div>
                    <label id="lbl"></label>
                  </div>
                </div>
                <div class="col-sm-4" style="width:200px; height:350px;float: right">
                  <div id='Grid'>
                  </div>
                </div>
            </div>
    </div>
</body> 
</html>