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Crosshair and Trackball in JavaScript Chart control

02 Aug 2021 / 4 minutes to read

Crosshair has a vertical and horizontal line to view the value of the axis at mouse or touch position.

Crosshair lines can be enabled by using enable property in the crosshair. Likewise tooltip label for an axis can be enabled by using enable property of crosshairTooltip in the corresponding axis.

Source
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index.ts
index.html
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import { Chart, LineSeries, Crosshair, DateTime, Legend } from '@syncfusion/ej2-charts';
import { series1 } from './datasource.ts';
Chart.Inject(LineSeries, DateTime, Crosshair, Legend);
let chart: Chart = new Chart({
        primaryXAxis: {
            valueType: 'DateTime',
        },
        series: [
            {
                type: 'Line', width: 2, name: 'Temperature',
                dataSource: series1, xName: 'x', yName: 'y'
            }
        ],
        //crosshair for chart
        crosshair: { enable: true },
        legendSettings: { visible: true },
        title: 'Weather Condition'
}, '#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="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>
     <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>
</body>

</html>

Tooltip for axis

Tooltip label for an axis can be enabled by using enable property of crosshairTooltip in the corresponding axis.

Source
Preview
index.ts
index.html
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import { Chart, LineSeries, Crosshair, DateTime, Legend } from '@syncfusion/ej2-charts';
import { series1 } from './datasource.ts';
Chart.Inject(LineSeries, DateTime, Crosshair, Legend);
let chart: Chart = new Chart({
        primaryXAxis: {
            valueType: 'DateTime',
            crosshairTooltip: { enable: true },
        },
        primaryYAxis:
        {
            crosshairTooltip: { enable: true }
        },
        series: [
            {
                type: 'Line', width: 2, name: 'Temperature',
                dataSource: series1, xName: 'x', yName: 'y'
            }
        ],
        //crosshair for chart
        crosshair: { enable: true },
        legendSettings: { visible: true },
        title: 'Weather Condition'
}, '#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://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>
     <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>
</body>

</html>

Customization

The fill and textStyle property of the crosshairTooltip is used to customize the background color and font style of the crosshair label respectively. Color and width of the crosshair line can be customized by using the line property in the crosshair.

Source
Preview
index.ts
index.html
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import { Chart, LineSeries, Crosshair, DateTime, Legend } from '@syncfusion/ej2-charts';
import { series1 } from './datasource.ts';
Chart.Inject(LineSeries, DateTime, Crosshair, Legend);
let chart: Chart = new Chart({
        primaryXAxis: {
            valueType: 'DateTime',
            crosshairTooltip: { enable: true, fill: 'green' },
        },
        primaryYAxis:
        {
            crosshairTooltip: { enable: true, fill: 'green' },
        },
        series: [
            {
                type: 'Line', width: 2, name: 'Temperature',
                dataSource: series1, xName: 'x', yName: 'y'
            }
        ],
        crosshair: {
            enable: true,
            // customizing crosshair
            line: {width: 2, color: 'green'} },
        legendSettings: { visible: true },
        title: 'Weather Condition'
}, '#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://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>
     <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>
</body>

</html>

Note: To use crosshair feature, we need to inject Crosshair module Chart.Inject(Crosshair) method.

Trackball

Trackball is used to track a data point closest to the mouse or touch position. Trackball marker indicates the closest point and trackball tooltip displays the information about the point. To use trackball feature, we need to inject Crosshair module and Tooltip module using Chart.Inject(Crosshair, Tooltip).

Trackball can be enabled by setting the enable property of the crosshair to true and shared property in tooltip to true in chart.

Source
Preview
index.ts
index.html
Copied to clipboard
import {  Tooltip, Crosshair, DateTime } from '@syncfusion/ej2-charts';
import { Chart, LineSeries, Legend } from '@syncfusion/ej2-charts';
import { trackData } from './datasource.ts';
Chart.Inject(LineSeries, DateTime, Tooltip, Crosshair, Legend);
let chart: Chart = new Chart({
        primaryXAxis: {
            valueType: 'DateTime',
        },
        series: [
            {
                dataSource: trackData, name: 'John', xName: 'x',
                marker: { visible: true },
                type: 'Line', width: 2,
                yName: 'y'
            },
            {
                dataSource: trackData, name: 'Andrew', xName: 'x',
                marker: { visible: true },
                type: 'Line', width: 2,
                yName: 'y1'
            },
            {
                dataSource: trackData, name: 'Thomas', xName: 'x',
                marker: { visible: true },
                type: 'Line', width: 2,
                yName: 'y2'
            },
            {
                dataSource: trackData, name: 'Mark', xName: 'x',
                marker: { visible: true },
                type: 'Line', width: 2,
                yName: 'y3'
            },
            {
                dataSource: trackData, name: 'William', xName: 'x',
                marker: { visible: true },
                type: 'Line', width: 2,
                yName: 'y4'
            }
        ],
        // trackball for chart
        tooltip: { enable: true, shared: true, format: '${series.name} : ${point.x} : ${point.y}' },
        crosshair: { enable: true, lineType: 'Vertical' },
        title: 'Average Sales per Person'
}, '#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://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>
     <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>
</body>

</html>