Data labels in React Chart component

21 Oct 202524 minutes to read

Data label can be added to a chart series by enabling the visibleoption in the dataLabel. By default, the labels will arrange smartly without overlapping.

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, DateTime, Tooltip, DataLabel, LineSeries } from '@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const marker = {
        visible: true,
        height: 10, width: 10,
        shape: 'Pentagon',
        dataLabel: { visible: true }
    };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis}>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, DateTime]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' width={2} name='Warmest' type='Line' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
  AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
  Legend, DateTime, Tooltip, DataLabel, LineSeries, MarkerSettingsModel
} from '@syncfusion/ej2-react-charts';
import { data } from './datasource';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const marker: MarkerSettingsModel = {
    visible: true,
    height: 10, width: 10,
    shape: 'Pentagon',
    dataLabel: { visible: true }
  };

  return <ChartComponent id='charts'
    primaryXAxis={primaryxAxis}>
    <Inject services={[LineSeries, Legend, Tooltip, DataLabel, DateTime]} />
    <SeriesCollectionDirective>
      <SeriesDirective dataSource={data} xName='x' yName='y' width={2} name='Warmest'
        type='Line' marker={marker}>
      </SeriesDirective>
    </SeriesCollectionDirective>
  </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let data = [
    { x: new Date(2016, 0, 1),  y: -7.1 }, { x: new Date(2016, 1, 1),  y: -3.7 },
    { x: new Date(2016, 2, 1),  y: 0.8 },  { x: new Date(2016, 3, 1),  y: 6.3 },
    { x: new Date(2016, 4, 1),  y: 13.3 }, { x: new Date(2016, 5, 1),  y: 18.0 },
    { x: new Date(2016, 6, 1),  y: 19.8 }, { x: new Date(2016, 7, 1),  y: 18.1 },
    { x: new Date(2016, 8, 1),  y: 13.1 }, { x: new Date(2016, 9, 1),  y: 4.1 },
    { x: new Date(2016, 10, 1), y: -3.8 }, { x: new Date(2016, 11, 1), y: -6.8 }
];

datasource.tsx

export let data: Object[] = [
    { x: new Date(2016, 0, 1),  y: -7.1 }, { x: new Date(2016, 1, 1),  y: -3.7 },
    { x: new Date(2016, 2, 1),  y: 0.8 },  { x: new Date(2016, 3, 1),  y: 6.3 },
    { x: new Date(2016, 4, 1),  y: 13.3 }, { x: new Date(2016, 5, 1),  y: 18.0 },
    { x: new Date(2016, 6, 1),  y: 19.8 }, { x: new Date(2016, 7, 1),  y: 18.1 },
    { x: new Date(2016, 8, 1),  y: 13.1 }, { x: new Date(2016, 9, 1),  y: 4.1 },
    { x: new Date(2016, 10, 1), y: -3.8 }, { x: new Date(2016, 11, 1), y: -6.8 }
];

Note: To use data label feature, we need to inject DataLabel module into the services.

Position

Using position property, you can place the label either on Top, Middle,Bottom or Outer (outer is applicable for column and bar type series).

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, LineSeries } from '@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {
    const primaryxAxis = { title: 'Months', valueType: 'Category' };
    const marker = { dataLabel: { visible: true, position: 'Middle' } };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis}>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' width={2} name='Warmest' type='Line' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, Category, Tooltip, DataLabel, LineSeries}
from'@syncfusion/ej2-react-charts';
import { data } from './datasource';

function App() {

  const primaryxAxis: AxisModel = { title: 'Months', valueType: 'Category' };
  const marker = { dataLabel: { visible: true, position: 'Middle' } };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' width={2} name='Warmest'
          type='Line' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let data = [
    { x: 'Jan', y: -7.1 }, { x: 'Feb', y: -3.7 },
    { x: 'Mar', y: 2 },    { x: 'Apr', y: 6.3 },
    { x: 'May', y: 13.3 }, { x: 'Jun', y: 18.0 },
    { x: 'Jul', y: 19.8 }, { x: 'Aug', y: 18.1 },
    { x: 'Sep', y: 13.1 }, { x: 'Oct', y: 4.1 },
    { x: 'Nov', y: -3.8 }, { x: 'Dec', y: -6.8 }
];

datasource.tsx

export let data: Object[] = [
    { x: 'Jan', y: -7.1 }, { x: 'Feb', y: -3.7 },
    { x: 'Mar', y: 2 },    { x: 'Apr', y: 6.3 },
    { x: 'May', y: 13.3 }, { x: 'Jun', y: 18.0 },
    { x: 'Jul', y: 19.8 }, { x: 'Aug', y: 18.1 },
    { x: 'Sep', y: 13.1 }, { x: 'Oct', y: 4.1 },
    { x: 'Nov', y: -3.8 }, { x: 'Dec', y: -6.8 }
];

Note: The position Outer is applicable for column and bar type series.

Data Label Template

Label content can be formatted by using the template option. Inside the template, you can add the placeholder text ${point.x} and ${point.x} to display corresponding data points x & y value. Using template property, you can set data label template in chart.

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, DateTime, Tooltip, DataLabel, LineSeries } from '@syncfusion/ej2-react-charts';
import { data } from './datasource';

function App() {
  const primaryxAxis = { title: 'Months', valueType: 'DateTime', intervalType: 'Months' };
  const template = chartTemplate;
  const marker = { dataLabel: { visible: true, position: 'Middle', template: template } };
  function chartTemplate(args) {
    return (<div id="templateWrap" style={{ border: '1px solid black', backgroundColor: 'red', padding: '3px 3px 3px 3px' }}>
      <div>{args.point.x.getFullYear()}</div>
      <div>{args.point.y}</div>
    </div>);
  }
  ;
  return <ChartComponent id='charts' primaryXAxis={primaryxAxis}>
    <Inject services={[LineSeries, Legend, Tooltip, DataLabel, DateTime]} />
    <SeriesCollectionDirective>
      <SeriesDirective dataSource={data} xName='x' yName='y' width={2} name='Warmest' type='Line' marker={marker}>
      </SeriesDirective>
    </SeriesCollectionDirective>
  </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
  AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
  Legend, DateTime, Tooltip, DataLabel, LineSeries, MarkerSettingsModel
}
  from '@syncfusion/ej2-react-charts';
import { data } from './datasource';

function App() {

  const primaryxAxis: AxisModel = { title: 'Months', valueType: 'DateTime', intervalType: 'Months' };
  const template: any = chartTemplate;
  const marker: MarkerSettingsModel = { dataLabel: { visible: true, position: 'Middle', template: template } };
  function chartTemplate(args: any) {
    return (<div id="templateWrap" style={{ border: '1px solid black', backgroundColor: 'red', padding: '3px 3px 3px 3px' }}>
      <div>{args.point.x.getFullYear()}</div>
      <div>{args.point.y}</div>
    </div>);
  };

  return <ChartComponent id='charts'
    primaryXAxis={primaryxAxis}>
    <Inject services={[LineSeries, Legend, Tooltip, DataLabel, DateTime]} />
    <SeriesCollectionDirective>
      <SeriesDirective dataSource={data} xName='x' yName='y' width={2} name='Warmest'
        type='Line' marker={marker}>
      </SeriesDirective>
    </SeriesCollectionDirective>
  </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let data = [
    { x: new Date(2016, 0, 1),  y: -7.1 }, { x: new Date(2016, 1, 1),  y: -3.7 },
    { x: new Date(2016, 2, 1),  y: 0.8 },  { x: new Date(2016, 3, 1),  y: 6.3 },
    { x: new Date(2016, 4, 1),  y: 13.3 }, { x: new Date(2016, 5, 1),  y: 18.0 },
    { x: new Date(2016, 6, 1),  y: 19.8 }, { x: new Date(2016, 7, 1),  y: 18.1 },
    { x: new Date(2016, 8, 1),  y: 13.1 }, { x: new Date(2016, 9, 1),  y: 4.1 },
    { x: new Date(2016, 10, 1), y: -3.8 }, { x: new Date(2016, 11, 1), y: -6.8 }
];

datasource.tsx

export let data: Object[] = [
    { x: new Date(2016, 0, 1),  y: -7.1 }, { x: new Date(2016, 1, 1),  y: -3.7 },
    { x: new Date(2016, 2, 1),  y: 0.8 },  { x: new Date(2016, 3, 1),  y: 6.3 },
    { x: new Date(2016, 4, 1),  y: 13.3 }, { x: new Date(2016, 5, 1),  y: 18.0 },
    { x: new Date(2016, 6, 1),  y: 19.8 }, { x: new Date(2016, 7, 1),  y: 18.1 },
    { x: new Date(2016, 8, 1),  y: 13.1 }, { x: new Date(2016, 9, 1),  y: 4.1 },
    { x: new Date(2016, 10, 1), y: -3.8 }, { x: new Date(2016, 11, 1), y: -6.8 }
];

Text Mapping

Text from the data source can be mapped using name property.

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, ColumnSeries } from '@syncfusion/ej2-react-charts';
import { mapData } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'Category' };
    const marker = { dataLabel: { visible: true, name: 'text' } };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={mapData} xName='x' yName='y' type='Column' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, Category, Tooltip, DataLabel, ColumnSeries}
from'@syncfusion/ej2-react-charts';
import { mapData } from './datasource';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'Category' };
  const marker = { dataLabel: { visible: true, name: 'text' } };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={mapData} xName='x' yName='y'
          type='Column' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let mapData = [
    { x: 'Jan', y: 12, text: 'January : 12°C' }, 
    { x: 'Feb', y: 8,  text: 'February : 8°C' }, 
    { x: 'Mar', y: 11, text: 'March : 11°C' }, 
    { x: 'Apr', y: 6,  text: 'April : 6°C' }
];

datasource.tsx

export let mapData: Object[] = [
    { x: 'Jan', y: 12, text: 'January : 12°C' }, 
    { x: 'Feb', y: 8,  text: 'February : 8°C' }, 
    { x: 'Mar', y: 11, text: 'March : 11°C' }, 
    { x: 'Apr', y: 6,  text: 'April : 6°C' }
];

Format

Data label for the chart can be formatted using format property. You can use the global formatting options, such as ‘n’, ‘p’, and ‘c’.

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, ColumnSeries } from '@syncfusion/ej2-react-charts';
import { mapData } from './datasource';
class App extends React.Component {
    primaryxAxis = { valueType: 'Category' };
    marker = { dataLabel: { visible: true, format: 'n2' } };
    render() {
        return <ChartComponent id='charts' primaryXAxis={this.primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={mapData} xName='x' yName='y' type='Column' marker={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
    }
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, Category, Tooltip, DataLabel, ColumnSeries}
from'@syncfusion/ej2-react-charts';
import { mapData } from './datasource';
class App extends React.Component<{}, {}> {

  public primaryxAxis: AxisModel = { valueType: 'Category' };
  public marker = { dataLabel: { visible: true, format: 'n2' } };

  render() {
    return <ChartComponent id='charts'
      primaryXAxis={this.primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={mapData} xName='x' yName='y'
          type='Column' marker={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  }

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let mapData = [
    { x: 'Jan', y: 12, text: 'January : 12°C' }, 
    { x: 'Feb', y: 8,  text: 'February : 8°C' }, 
    { x: 'Mar', y: 11, text: 'March : 11°C' }, 
    { x: 'Apr', y: 6,  text: 'April : 6°C' }
];

datasource.tsx

export let mapData: Object[] = [
    { x: 'Jan', y: 12, text: 'January : 12°C' }, 
    { x: 'Feb', y: 8,  text: 'February : 8°C' }, 
    { x: 'Mar', y: 11, text: 'March : 11°C' }, 
    { x: 'Apr', y: 6,  text: 'April : 6°C' }
];

Value	Format	Resultant Value	Description
1000	n1	1000.0	The number is rounded to 1 decimal place.
1000	n2	1000.00	The number is rounded to 2 decimal places.
1000	n3	1000.000	The number is rounded to 3 decimal place.
0.01	p1	1.0%	The number is converted to percentage with 1 decimal place.
0.01	p2	1.00%	The number is converted to percentage with 2 decimal place.
0.01	p3	1.000%	The number is converted to percentage with 3 decimal place.
1000	c1	$1000.0	The currency symbol is appended to number and number is rounded to 1 decimal place.
1000	c2	$1000.00	The currency symbol is appended to number and number is rounded to 2 decimal place.

Margin

margin for data label can be applied to using left, right, bottom and top properties.

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, ColumnSeries } from '@syncfusion/ej2-react-charts';
import { columnData } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'Category' };
    const marker = {
        dataLabel: {
            visible: true, border: { width: 1, color: 'red' },
            margin: {
                left: 5,
                right: 5,
                top: 5,
                bottom: 5
            }
        }
    };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={columnData} xName='country' yName='gold' type='Column' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, Category, Tooltip, DataLabel, ColumnSeries}
from'@syncfusion/ej2-react-charts';
import { columnData } from './datasource';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'Category' };
  const marker = {
    dataLabel: {
      visible: true, border: { width: 1, color: 'red' },
      margin: {
        left: 5,
        right: 5,
        top: 5,
        bottom: 5
      }
    }
  };
  
  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={columnData} xName='country' yName='gold'
          type='Column' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let columnData = [
    { country: "USA",       gold: 50 },
    { country: "China",     gold: 40 },
    { country: "Japan",     gold: 70 },
    { country: "Australia", gold: 60 },
    { country: "France",    gold: 50 },
    { country: "Germany",   gold: 40 },
    { country: "Italy",     gold: 40 },
    { country: "Sweden",    gold: 30 }
];

datasource.tsx

export let columnData: Object[] = [
    { country: "USA",       gold: 50 },
    { country: "China",     gold: 40 },
    { country: "Japan",     gold: 70 },
    { country: "Australia", gold: 60 },
    { country: "France",    gold: 50 },
    { country: "Germany",   gold: 40 },
    { country: "Italy",     gold: 40 },
    { country: "Sweden",    gold: 30 }
];

DataLabel Rotation

Using angle property, you can rotate the data label by its given angle.

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, ColumnSeries } from '@syncfusion/ej2-react-charts';
import { columnData } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'Category' };
    const marker = {
        //Data label angle as 45
        dataLabel: {
            visible: true, border: { width: 1, color: 'red' },
            margin: {
                left: 5,
                right: 5,
                top: 5,
                bottom: 5
            }, angle: 45, enableRotation: true
        }
    };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={columnData} xName='country' yName='gold' type='Column' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, Category, Tooltip, DataLabel, ColumnSeries}
from'@syncfusion/ej2-react-charts';
import { columnData } from './datasource';
function App() {

  const primaryxAxis: AxisModel = { valueType: 'Category' };
  const marker = {
    //Data label angle as 45
    dataLabel: {
      visible: true, border: { width: 1, color: 'red' },
      margin: {
        left: 5,
        right: 5,
        top: 5,
        bottom: 5
      }, angle: 45, enableRotation: true
    }
  };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={columnData} xName='country' yName='gold'
          type='Column' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  
};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let columnData = [
    { country: "USA",       gold: 50 },
    { country: "China",     gold: 40 },
    { country: "Japan",     gold: 70 },
    { country: "Australia", gold: 60 },
    { country: "France",    gold: 50 },
    { country: "Germany",   gold: 40 },
    { country: "Italy",     gold: 40 },
    { country: "Sweden",    gold: 30 }
];

datasource.tsx

export let columnData: Object[] = [
    { country: "USA",       gold: 50 },
    { country: "China",     gold: 40 },
    { country: "Japan",     gold: 70 },
    { country: "Australia", gold: 60 },
    { country: "France",    gold: 50 },
    { country: "Germany",   gold: 40 },
    { country: "Italy",     gold: 40 },
    { country: "Sweden",    gold: 30 }
];

Customization

stroke and border of data label can be customized using fill and border properties. Rounded corners can be customized using rx and ry properties. The data label can be customized by using the color, fontFamily, fontWeight, size properties in the font property of the data label.

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, ColumnSeries } from '@syncfusion/ej2-react-charts';
import { columnData } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'Category' };
    const marker = {
        dataLabel: {
            visible: true, font: { color: "blue", fontWeight: "500" }, border: { width: 2, color: 'red' },
            rx: 10, ry: 10
        }
    };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={columnData} xName='country' yName='gold' type='Column' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, Category, Tooltip, DataLabel, ColumnSeries}
from'@syncfusion/ej2-react-charts';
import { columnData } from './datasource';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'Category' };
  const marker = {
    dataLabel: {
      visible: true, font: { color: "blue", fontWeight: "500" }, border: { width: 2, color: 'red' },
      rx: 10, ry: 10
    }
  };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={columnData} xName='country' yName='gold'
          type='Column' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let columnData = [
    { country: "USA",       gold: 50 },
    { country: "China",     gold: 40 },
    { country: "Japan",     gold: 70 },
    { country: "Australia", gold: 60 },
    { country: "France",    gold: 50 },
    { country: "Germany",   gold: 40 },
    { country: "Italy",     gold: 40 },
    { country: "Sweden",    gold: 30 }
];

datasource.tsx

export let columnData: Object[] = [
    { country: "USA",       gold: 50 },
    { country: "China",     gold: 40 },
    { country: "Japan",     gold: 70 },
    { country: "Australia", gold: 60 },
    { country: "France",    gold: 50 },
    { country: "Germany",   gold: 40 },
    { country: "Italy",     gold: 40 },
    { country: "Sweden",    gold: 30 }
];

Note: rx and ry properties requires border values not to be null.

Customizing Specific Point

You can also customize the specific marker and label using pointRender and textRender event. pointRender event allows you to change the shape, color and border for a point, whereas the textRender event allows you to change the text for the point.

index.jsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, LineSeries } from '@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {
    const pointRender = (args) => {
        if (args.point.index === 6) {
            args.fill = 'red';
        }
    };
    const primaryxAxis = { valueType: 'Category' };
    const marker = { dataLabel: { visible: true, position: 'Middle' } };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} pointRender={pointRender} title='Alaska Weather Statistics - 2016'>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' type='Line' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {  AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, Category, Tooltip, DataLabel, LineSeries}
from'@syncfusion/ej2-react-charts';
import { data } from './datasource';

function App() {

  const pointRender: EmitType<IPointRenderEventArgs> = (args: IPointRenderEventArgs): void => {
    if (args.point.index === 6) {
      args.fill = 'red'
    }
  };
  const primaryxAxis: AxisModel = { valueType: 'Category' };
  const marker = { dataLabel: { visible: true, position: 'Middle' } };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      pointRender={pointRender}
      title='Alaska Weather Statistics - 2016'>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y'
          type='Line' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

datasource.jsx

export let data = [
    { x: 'Jan', y: -7.1 }, { x: 'Feb', y: -3.7 },
    { x: 'Mar', y: 2 },    { x: 'Apr', y: 6.3 },
    { x: 'May', y: 13.3 }, { x: 'Jun', y: 18.0 },
    { x: 'Jul', y: 19.8 }, { x: 'Aug', y: 18.1 },
    { x: 'Sep', y: 13.1 }, { x: 'Oct', y: 4.1 },
    { x: 'Nov', y: -3.8 }, { x: 'Dec', y: -6.8 }
];

datasource.tsx

export let data: Object[] = [
    { x: 'Jan', y: -7.1 }, { x: 'Feb', y: -3.7 },
    { x: 'Mar', y: 2 },    { x: 'Apr', y: 6.3 },
    { x: 'May', y: 13.3 }, { x: 'Jun', y: 18.0 },
    { x: 'Jul', y: 19.8 }, { x: 'Aug', y: 18.1 },
    { x: 'Sep', y: 13.1 }, { x: 'Oct', y: 4.1 },
    { x: 'Nov', y: -3.8 }, { x: 'Dec', y: -6.8 }
];

Show percentage based on each series points

You can calculate the percentage value based on the sum for each series using the seriesRender and textRender events in the chart. In seriesRender calculate the sum of each series y values and In textRender calculate percentage value based on the sum value and modify the text.

index.jsx

import { render } from 'react-dom';
import * as React from "react";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, ColumnSeries, DataLabel } from '@syncfusion/ej2-react-charts';
import { Browser } from '@syncfusion/ej2-base';
import { data1, data2, data3 } from './datasource';

const total = [];
function App() {
    return (<div className='control-pane'>

            <div className='control-section'>
                <ChartComponent id='charts' style={{ textAlign: "center" }} textRender={onTextRender.bind(this)} primaryXAxis={{ valueType: 'Category', interval: 1, majorGridLines: { width: 0 } }} primaryYAxis={{
            majorGridLines: { width: 0 },
            majorTickLines: { width: 0 }, lineStyle: { width: 0 }, labelStyle: { color: 'transparent' }
        }} chartArea={{ border: { width: 0 } }} tooltip={{ enable: true }} width={Browser.isDevice ? '100%' : '60%'} title='Olympic Medal Counts - RIO' seriesRender={onSeriesRender.bind(this)}>
                    <Inject services={[ColumnSeries, Legend, Tooltip, Category, DataLabel]}/>
                    <SeriesCollectionDirective>
                        <SeriesDirective dataSource={data1} xName='x' yName='y' name='Gold' type='Column' marker={{ dataLabel: { visible: true, position: 'Top', font: { fontWeight: '600', color: '#ffffff' } } }}>
                        </SeriesDirective>
                        <SeriesDirective dataSource={data2} xName='x' yName='y' name='Silver' type='Column' marker={{ dataLabel: { visible: true, position: 'Top', font: { fontWeight: '600', color: '#ffffff' } } }}>
                        </SeriesDirective>
                        <SeriesDirective dataSource={data3} xName='x' yName='y' name='Bronze' type='Column' marker={{ dataLabel: { visible: true, position: 'Top', font: { fontWeight: '600', color: '#ffffff' } } }}>
                        </SeriesDirective>
                    </SeriesCollectionDirective>
                </ChartComponent>
            </div>
        </div>);
    function onSeriesRender(args) {
        for (var i = 0; i < args.data.length; i++) {
            if (!total[args.data[i].x])
                total[args.data[i].x] = 0;
            total[args.data[i].x] += parseInt(args.data[i].y);
        }
    }
    ;
    function onTextRender(args) {
        var percentage = (parseInt(args.text) / total[args.point.x]) * 100;
        percentage = percentage % 1 === 0 ? percentage : percentage.toFixed(2);
        args.text = percentage + '%';
    }
    ;
}
export default App;
render(<App />, document.getElementById('charts'));

index.tsx

import { render } from 'react-dom';
import * as React from "react";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, ColumnSeries, DataLabel } from '@syncfusion/ej2-react-charts';
import { Browser } from '@syncfusion/ej2-base';
import { data1, data2, data3 } from './datasource';

const total = [];

function App() {
        return (<div className='control-pane'>

            <div className='control-section'>
                <ChartComponent id='charts' style={{ textAlign: "center" }} textRender={onTextRender.bind(this)} primaryXAxis={{ valueType: 'Category', interval: 1, majorGridLines: { width: 0 } }} primaryYAxis={{
                    majorGridLines: { width: 0 },
                    majorTickLines: { width: 0 }, lineStyle: { width: 0 }, labelStyle: { color: 'transparent' }
                }} chartArea={{ border: { width: 0 } }} tooltip={{ enable: true }} width={Browser.isDevice ? '100%' : '60%'} title='Olympic Medal Counts - RIO' seriesRender={onSeriesRender.bind(this)}>
                    <Inject services={[ColumnSeries, Legend, Tooltip, Category, DataLabel]} />
                    <SeriesCollectionDirective>
                        <SeriesDirective dataSource={data1} xName='x' yName='y' name='Gold' type='Column' marker={{ dataLabel: { visible: true, position: 'Top', font: { fontWeight: '600', color: '#ffffff' } } }}>
                        </SeriesDirective>
                        <SeriesDirective dataSource={data2} xName='x' yName='y' name='Silver' type='Column' marker={{ dataLabel: { visible: true, position: 'Top', font: { fontWeight: '600', color: '#ffffff' } } }}>
                        </SeriesDirective>
                        <SeriesDirective dataSource={data3} xName='x' yName='y' name='Bronze' type='Column' marker={{ dataLabel: { visible: true, position: 'Top', font: { fontWeight: '600', color: '#ffffff' } } }}>
                        </SeriesDirective>
                    </SeriesCollectionDirective>
                </ChartComponent>
            </div>
        </div>);
      function onSeriesRender(args) {
        for (var i = 0; i < args.data.length; i++) {
            if (!total[args.data[i].x]) total[args.data[i].x] = 0;
            total[args.data[i].x] += parseInt(args.data[i].y);
          }
    }
    ;
    function onTextRender(args) {
        var percentage = (parseInt(args.text) / total[args.point.x]) * 100;
        percentage = percentage % 1 === 0 ? percentage : percentage.toFixed(2);
        args.text = percentage + '%';
    };
}
export default App;
render(<App />, document.getElementById('charts'));

datasource.jsx

export let data1 = [
    { x: 'USA', y: 46 }, 
    { x: 'GBR', y: 27 }, 
    { x: 'CHN', y: 26 }
];

export let data2 = [
    { x: 'USA', y: 37 }, 
    { x: 'GBR', y: 23 }, 
    { x: 'CHN', y: 18 }
];

export let data3 = [
    { x: 'USA', y: 38 }, 
    { x: 'GBR', y: 17 }, 
    { x: 'CHN', y: 26 }
];

datasource.tsx

export let data1: Object[] = [
    { x: 'USA', y: 46 }, 
    { x: 'GBR', y: 27 }, 
    { x: 'CHN', y: 26 }
];

export let data2: Object[] = [
    { x: 'USA', y: 37 }, 
    { x: 'GBR', y: 23 }, 
    { x: 'CHN', y: 18 }
];

export let data3: Object[] = [
    { x: 'USA', y: 38 }, 
    { x: 'GBR', y: 17 }, 
    { x: 'CHN', y: 26 }
];

See Also

• Show total stacking values in data label
• Prevent the data label when the data value is 0
• Display Data Labels in Lakh