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Annotation

Annotations are used to mark the specific area of interest in the chart area with texts, shapes or images.

You can add annotations to the chart by using the annotations option. By using the content option of annotation object, you can specify either the id of the element or directly specify the element in the content that needs to be displayed in the chart area.

Source
Preview
index.ts
index.html
import { Chart, ColumnSeries, Category, ChartAnnotation } from '@syncfusion/ej2-charts';
import { columnData } from './datasource.ts';
Chart.Inject(ColumnSeries, Category, ChartAnnotation);

let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'Category',
    },
    annotations:[{
        content: '70 Gold Medals',
        coordinateUnits: 'Point',
        x: 'France',
        y: 50
    }],
    series:[{
        dataSource: columnData,
        xName: 'country', yName: 'gold',
        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 id='element1'></div>
    </div>
</body>

</html>

Note: To use annotations feature, we need to inject ChartAnnotation using Chart.Inject(ChartAnnotation) method.

Region

Annotations can be placed either with respect to Series or Chart. by default, it will placed with respect to Chart.

Source
Preview
index.ts
index.html
import { Chart, ColumnSeries, Category, ChartAnnotation } from '@syncfusion/ej2-charts';
import { columnData } from './datasource.ts';
Chart.Inject(ColumnSeries, Category, ChartAnnotation);

let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'Category',
    },
    annotations:[{
        content: '<div>Highest Medal Count</div>',
        region: 'Series',
        coordinateUnits: 'Point',
        x: 'France',
        y: 50
    }],
    series:[{
        dataSource: columnData,
        xName: 'country', yName: 'gold',
        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 id='element1'></div>
    </div>
</body>

</html>

Co-ordinate Units

Specified the coordinates units of the annotation either Pixel or Point.

Source
Preview
index.ts
index.html
import { Chart, ColumnSeries, Category, ChartAnnotation } from '@syncfusion/ej2-charts';
import { columnData } from './datasource.ts';
Chart.Inject(ColumnSeries, Category, ChartAnnotation);

let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'Category',
    },
    annotations:[{
        content: '<div style="border: 1px solid black; padidng: 5px 5px 5px 5px, backgrund:#f5f5f5">Annotation in Pixel</div>',
        coordinateUnits: 'Pixel',
        x: 150,
        y: 50
    }],
    series:[{
        dataSource: columnData,
        xName: 'country', yName: 'gold',
        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 id='element1'></div>
    </div>
</body>

</html>

Alignment

Annotation provides verticalAlignment and horizontalAlignment. The verticalAlignment can be customized via Top, Bottom or Middle and the horizontalAlignment can be customized via Near, Far or Center.

Source
Preview
index.ts
index.html
import { Chart, ColumnSeries, Category, ChartAnnotation } from '@syncfusion/ej2-charts';
import { columnData } from './datasource.ts';
Chart.Inject(ColumnSeries, Category, ChartAnnotation);

let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'Category',
    },
    annotations:[{
        content: '<div style="border: 1px solid black; padidng: 5px 5px 5px 5px, backgrund:#f5f5f5">Highest Medal Count</div>',
        x: 'France',
        y: 50,
        verticalAlignment:'Top',
        horizontalAlignment:'Near'
    }],
    series:[{
        dataSource: columnData,
        xName: 'country', yName: 'gold',
        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 id='element1'></div>
    </div>
</body>

</html>

Adding y-axis sub title through on annotation

By setting text div in the content option of annotation object you can add sub title to chart y-axis. Specified the coordinate value as pixel and customize x and y location of the text.

Source
Preview
index.ts
index.html
import { Chart, ColumnSeries, Category, ChartAnnotation } from '@syncfusion/ej2-charts';
import { columnData } from './datasource.ts';
Chart.Inject(ColumnSeries, Category, ChartAnnotation);

let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'Category',
    },
     primaryYAxis: {
      title: '(m2/min)'
    },
    annotations:[{
        content: '<div id="text" style="transform: rotate(-90deg);">Speed Rate</div>',
        x: 6,
        y: 180,
        coordinateUnits: 'Pixel',
        Region: 'Chart'
    }],
    series:[{
        dataSource: columnData,
        xName: 'country', yName: 'gold',
        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 id='element1'></div>
    </div>
</body>

</html>

See Also