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Tooltip in JavaScript (ES5) Chart control

12 May 2022 / 3 minutes to read

Chart will display details about the points through tooltip, when the mouse is moved over the point.

Default Tooltip

By default, tooltip is not visible. Enable the tooltip by setting enable property to true and by injecting Tooltip module using Chart.Inject(Tooltip).

Source
Preview
index.js
index.html
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var chartData = [
    { x: new Date(1975, 0, 1), y: 16, y1: 10, y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19, y1: 11, y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7, y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8, y2: 5 },
    { x: new Date(2000, 0, 1), y: 14, y1: 6, y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10, y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16, y1: 7, y2: 3.7 }
];
var chart = new ej.charts.Chart({
        primaryXAxis: {
            title: 'Years',
            lineStyle: { width: 0 },
            labelFormat: 'y',
            intervalType: 'Years',
            valueType: 'DateTime',
            edgeLabelPlacement: 'Shift'
        },
        primaryYAxis:
        {
            title: 'Percentage (%)',
            minimum: 0, maximum: 20, interval: 2,
            labelFormat: '{value}%'
        },
        series: [
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y',
                width: 2, name: 'China',
                marker: {
                    visible: true, width: 10, height: 10
                },
            },
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y1',
                width: 2, name: 'Australia',
                marker: {
                    visible: true, width: 10, height: 10
                },
            },
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y2',
                width: 2, name: 'Japan',
                marker: {
                    visible: true, width: 10, height: 10
                },

            },
        ],
        title: 'Unemployment Rates 1975-2010',
        //Tooltip for chart
        tooltip: {enable: true}
}, '#element');
Copied to clipboard
<!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://cdn.syncfusion.com/ej2/20.1.55/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>
     <script id="Unemployment" type="text/x-template">
      <div id='templateWrap'>
     <table style="width:100%;  border: 1px solid black;">
     <tr><th colspan="2" bgcolor="#00FFFF">Unemployment</th></tr>
     <tr><td bgcolor="#00FFFF">${x}:</td><td bgcolor="#00FFFF">${y}</td></tr>
    </table>
    </div>
  </script>


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

Format the Tooltip

By default, tooltip shows information of x and y value in points. In addition to that, you can show more information in tooltip. For example the format ${series.name} ${point.x} shows series name and point x value.

Source
Preview
index.js
index.html
Copied to clipboard
var chartData = [
    { x: new Date(1975, 0, 1), y: 16, y1: 10, y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19, y1: 11, y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7, y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8, y2: 5 },
    { x: new Date(2000, 0, 1), y: 14, y1: 6, y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10, y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16, y1: 7, y2: 3.7 }
];
var chart = new ej.charts.Chart({
        primaryXAxis: {
            title: 'Years',
            lineStyle: { width: 0 },
            labelFormat: 'y',
            intervalType: 'Years',
            valueType: 'DateTime',
            edgeLabelPlacement: 'Shift'
        },
        primaryYAxis:
        {
            title: 'Percentage (%)',
            minimum: 0, maximum: 20, interval: 2,
            labelFormat: '{value}%'
        },
        series: [
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y',
                width: 2, name: 'China',
                marker: {
                    visible: true, width: 10, height: 10
                },
            },
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y1',
                width: 2, name: 'Australia',
                marker: {
                    visible: true, width: 10, height: 10
                },
            },
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y2',
                width: 2, name: 'Japan',
                marker: {
                    visible: true, width: 10, height: 10
                },

            },
        ],
        title: 'Unemployment Rates 1975-2010',
        tooltip: {
            enable: true,
            //tooltip format for chart
            format: '${series.name} ${point.x} : ${point.y}'
        }
}, '#element');
Copied to clipboard
<!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://cdn.syncfusion.com/ej2/20.1.55/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>
     <script id="Unemployment" type="text/x-template">
      <div id='templateWrap'>
     <table style="width:100%;  border: 1px solid black;">
     <tr><th colspan="2" bgcolor="#00FFFF">Unemployment</th></tr>
     <tr><td bgcolor="#00FFFF">${x}:</td><td bgcolor="#00FFFF">${y}</td></tr>
    </table>
    </div>
  </script>


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

Tooltip Template

Any HTML elements can be displayed in the tooltip by using the ‘template’ property of the tooltip. You can use the ${x} and ${y} as place holders in the HTML element to display the x and y values of the corresponding data point.

Source
Preview
index.js
index.html
Copied to clipboard
var chartData = [
    { x: 1975, y: 16, y1: 10, y2: 4.5 },
    { x: 1980, y: 12.5, y1: 7.5, y2: 5 },
    { x: 1985, y: 19, y1: 11, y2: 6.5 },
    { x: 1990, y: 14.4, y1: 7, y2: 4.4 },
    { x: 1995, y: 11.5, y1: 8, y2: 5 },
    { x: 2000, y: 14, y1: 6, y2: 1.5 },
    { x: 2005, y: 10, y1: 3.5, y2: 2.5 },
    { x: 2010, y: 16, y1: 7, y2: 3.7 }
];
var chart = new ej.charts.Chart({
        primaryXAxis: {
            title: 'Years',
            lineStyle: { width: 0 },
            minimum: 1975,
            maximum: 2010,
            interval: 5,
            edgeLabelPlacement: 'Shift'
        },
        primaryYAxis:
        {
            title: 'Percentage (%)',
            minimum: 0, maximum: 20, interval: 2,
            labelFormat: '{value}%'
        },
        series: [
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y',
                width: 2, name: 'China',
                marker: {
                    visible: true, width: 10, height: 10
                },
            },
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y1',
                width: 2, name: 'Australia',
                marker: {
                    visible: true, width: 10, height: 10
                },
            },
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y2',
                width: 2, name: 'Japan',
                marker: {
                    visible: true, width: 10, height: 10
                },

            },
        ],
        title: 'Unemployment Rates 1975-2010',
        tooltip: {
            enable: true,
            //tooltip template for chart
            template: '<div>${x}</div><div>${y}</div>'
        }
}, '#element');
Copied to clipboard
<!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://cdn.syncfusion.com/ej2/20.1.55/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>
     <script id="Unemployment" type="text/x-template">
      <div id='templateWrap'>
     <table style="width:100%;  border: 1px solid black;">
     <tr><th colspan="2" bgcolor="#00FFFF">Unemployment</th></tr>
     <tr><td bgcolor="#00FFFF">${x}:</td><td bgcolor="#00FFFF">${y}</td></tr>
    </table>
    </div>
  </script>


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

Customize the Appearance of Tooltip

The fill and border properties are used to customize the background color and border of the tooltip respectively. The textStyle property in the tooltip is used to customize the font of the tooltip text. The highlightColor property is used to customize the point color while hovering for tooltip.

Source
Preview
index.js
index.html
Copied to clipboard
var chartData = [
    { x: new Date(1975, 0, 1), y: 16, y1: 10, y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19, y1: 11, y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7, y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8, y2: 5 },
    { x: new Date(2000, 0, 1), y: 14, y1: 6, y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10, y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16, y1: 7, y2: 3.7 }
];
var chart = new ej.charts.Chart({
        primaryXAxis: {
            title: 'Years',
            lineStyle: { width: 0 },
            labelFormat: 'y',
            intervalType: 'Years',
            valueType: 'DateTime',
            edgeLabelPlacement: 'Shift'
        },
         //Highlight color for tooltip
        highlightColor: 'red',
        primaryYAxis:
        {
            title: 'Percentage (%)',
            minimum: 0, maximum: 20, interval: 2,
            labelFormat: '{value}%'
        },
        series: [
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y',
                width: 2, name: 'China',
                marker: {
                    visible: true, width: 10, height: 10
                },
            },
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y1',
                width: 2, name: 'Australia',
                marker: {
                    visible: true, width: 10, height: 10
                },
            },
            {
                type: 'StepLine',
                dataSource: chartData, xName: 'x', yName: 'y2',
                width: 2, name: 'Japan',
                marker: {
                    visible: true, width: 10, height: 10
                },

            },
        ],
        title: 'Unemployment Rates 1975-2010',
        tooltip: {
            enable: true,
            format: '${series.name} ${point.x} : ${point.y}',
            //fill for tooltip
            fill: '#7bb4eb',
            //border for tooltip
            border: {
                width: 2,
                color: 'grey'
            }
        }
}, '#element');
Copied to clipboard
<!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://cdn.syncfusion.com/ej2/20.1.55/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>
     <script id="Unemployment" type="text/x-template">
      <div id='templateWrap'>
     <table style="width:100%;  border: 1px solid black;">
     <tr><th colspan="2" bgcolor="#00FFFF">Unemployment</th></tr>
     <tr><td bgcolor="#00FFFF">${x}:</td><td bgcolor="#00FFFF">${y}</td></tr>
    </table>
    </div>
  </script>


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

See Also

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