Cross hair and track ball in EJ2 TypeScript Chart control

8 May 202317 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.

index.ts
index.html
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');
<!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>
     <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 label for an axis can be enabled by using enable property of crosshairTooltip in the corresponding axis.

index.ts
index.html
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');
<!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>
     <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.

index.ts
index.html
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');
<!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>
     <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.

index.ts
index.html
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');
<!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>
     <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>

Cross hair and track ball in EJ2 TypeScript Chart control

Tooltip for axis

Customization

Trackball