Data markers in React Chart component

20 Jan 202324 minutes to read

Data markers are used to provide information about the data points in the series. You can add a shape to adorn each data point.

Marker

Markers can be added to the points by enabling the visible option of the marker property.

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

function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const marker = { visible: true };
  const data: any[] = [
    { 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 }
  ];

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y'
          type='Line' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  
};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));

Shape

Markers can be assigned with different shapes such as Rectangle, Circle, Diamond etc using the shapeproperty.

index.jsx
index.tsx
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.ts';
function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const marker = { visible: true, height: 10, width: 10, shape: 'Pentagon' };
    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"));
import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, DateTime, Tooltip, DataLabel, LineSeries}
from'@syncfusion/ej2-react-charts';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const marker = { visible: true, height: 10, width: 10, shape: 'Pentagon' };
  const data: any[] = [
    { 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 }
  ];

  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"));

Note : To know more about the marker shape type refer the shape.

Images

Apart from the shapes, you can also add custom images to mark the data point using the imageUrl property.

index.jsx
index.tsx
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';
function App() {
    const data = [
        { x: "Jan", y: 60 }, { x: "Feb", y: 50 },
        { x: "Mar", y: 64 }, { x: "Apr", y: 63 },
        { x: "May", y: 81 }, { x: "Jun", y: 64 },
        { x: "Jul", y: 82 }, { x: "Aug", y: 96 },
        { x: "Sep", y: 78 }, { x: "Oct", y: 60 },
        { x: "Nov", y: 58 }, { x: "Dec", y: 56 }
    ];
    const primaryxAxis = { title: 'Month', valueType: 'Category' };
    const primaryyAxis = {
        title: 'Temperature (°C)', rangePadding: 'None', labelFormat: '{value}°C',
        minimum: 0, maximum: 100
    };
    const marker = {
        visible: true, width: 10, height: 10, shape: 'Image',
        imageUrl: './sun_annotation.png'
    };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} primaryYAxis={primaryyAxis} title='Temperature flow over months'>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' width={2} name='India' type='Line' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
}
;
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
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';

function App() {

  const data: any[] = [
    { x: "Jan", y: 60 }, { x: "Feb", y: 50 },
    { x: "Mar", y: 64 }, { x: "Apr", y: 63 },
    { x: "May", y: 81 }, { x: "Jun", y: 64 },
    { x: "Jul", y: 82 }, { x: "Aug", y: 96 },
    { x: "Sep", y: 78 }, { x: "Oct", y: 60 },
    { x: "Nov", y: 58 }, { x: "Dec", y: 56 }
  ];
  const prim  const primaryyAxis: AxisModel = {aryxAxis: AxisModel = { title: 'Month', valueType: 'Category' };

    title: 'Temperature (°C)', rangePadding: 'None', labelFormat: '{value}°C',
    minimum: 0, maximum: 100
  };
  const marker = {
    visible: true, width: 10, height: 10, shape: 'Image',
    imageUrl: './sun_annotation.png'
  };

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

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

Customization

Marker’s color and border can be customized using fill and border properties.

index.jsx
index.tsx
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.ts';
function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const marker = {
        visible: true,
        fill: 'Red', height: 10, width: 10,
        border: { width: 2, color: 'blue' },
    };
    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"));
import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
         Legend, DateTime, Tooltip, DataLabel, LineSeries}
from'@syncfusion/ej2-react-charts';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const marker = {
    visible: true,
    fill: 'Red', height: 10, width: 10,
    border: { width: 2, color: 'blue' },
  };
  const data: any[] = [
    { 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 }
  ];

  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"));

Customizing specific point

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

index.jsx
index.tsx
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.ts';
function App() {
    const pointRender = (args) => {
        if (args.point.index === 3) {
            args.fill = 'red';
        }
    };
    const primaryxAxis = { valueType: 'DateTime' };
    const marker = { visible: true, height: 10, width: 10 };
    return <ChartComponent id='charts' pointRender={pointRender} 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"));
import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, IPointRenderEventArgs,
         Legend, DateTime, Tooltip, DataLabel, LineSeries}
from'@syncfusion/ej2-react-charts';

function App() {

  const pointRender = (args: IPointRenderEventArgs) => {
    if (args.point.index === 3) {
      args.fill = 'red'
    }
  };
  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const marker = { visible: true, height: 10, width: 10 };
  const data: any[] = [
    { 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 }
  ];

  return <ChartComponent id='charts' pointRender={pointRender}
      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"));

Fill marker with series color

Marker can be filled with the series color by setting the isFilled property to true.

index.jsx
index.tsx
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.ts';
class App extends React.Component {
    primaryxAxis = { valueType: 'DateTime' };
    marker = { visible: true, height: 10, width: 10, isFilled: true };
    render() {
        return <ChartComponent id='charts' pointRender={this.pointRender} primaryXAxis={this.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"));
import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel, ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, IPointRenderEventArgs,
         Legend, DateTime, Tooltip, DataLabel, LineSeries}
from'@syncfusion/ej2-react-charts';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const marker = { visible: true, height: 10, width: 10, isFilled: true };
  const data: any[] = [
    { 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 }
  ];

    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"));