Markers in React Chart component

24 Jun 2022 / 4 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.

Source

Preview

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 {
    constructor() {
        super(...arguments);
        this.primaryxAxis = { valueType: 'DateTime' };
        this.marker = { visible: true };
    }
    render() {
        return <ChartComponent id='charts' primaryXAxis={this.primaryxAxis}>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, DateTime]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' type='Line' marker={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
    }
}
;
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';
import { data } from 'datasource.ts';

class App extends React.Component<{}, {}> {

  public primaryxAxis: AxisModel = { valueType: 'DateTime' };
  public marker = { visible: true };

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

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

Shape

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

Source

Preview

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 {
    constructor() {
        super(...arguments);
        this.primaryxAxis = { valueType: 'DateTime' };
        this.marker = { visible: true, height: 10, width: 10, shape: 'Pentagon' };
    }
    render() {
        return <ChartComponent id='charts' 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={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
    }
}
;
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';
import { data } from 'datasource.ts';

class App extends React.Component<{}, {}> {

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

  render() {
    return <ChartComponent id='charts'
      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={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  }

};
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.

Source

Preview

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';
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.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 }
        ];
        this.primaryxAxis = { title: 'Month', valueType: 'Category' };
        this.primaryyAxis = {
            title: 'Temperature (°C)', rangePadding: 'None', labelFormat: '{value}°C',
            minimum: 0, maximum: 100
        };
        this.marker = {
            visible: true, width: 10, height: 10, shape: 'Image',
            imageUrl: './sun_annotation.png'
        };
    }
    render() {
        return <ChartComponent id='charts' primaryXAxis={this.primaryxAxis} primaryYAxis={this.primaryyAxis} title='Temperature flow over months'>
      <Inject services={[LineSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={this.data} xName='x' yName='y' width={2} name='India' type='Line' marker={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
    }
}
;
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';

class App extends React.Component<{}, {}> {

  public 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 }
  ];
  public primaryxAxis: AxisModel = { title: 'Month', valueType: 'Category' };
  public primaryyAxis: AxisModel = {
    title: 'Temperature (°C)', rangePadding: 'None', labelFormat: '{value}°C',
    minimum: 0, maximum: 100
  };
  public marker = {
    visible: true, width: 10, height: 10, shape: 'Image',
    imageUrl: './sun_annotation.png'
  };

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

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

Customization

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

Source

Preview

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 {
    constructor() {
        super(...arguments);
        this.primaryxAxis = { valueType: 'DateTime' };
        this.marker = {
            visible: true,
            fill: 'Red', height: 10, width: 10,
            border: { width: 2, color: 'blue' },
        };
    }
    render() {
        return <ChartComponent id='charts' 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={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
    }
}
;
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';
import { data } from 'datasource.ts';

class App extends React.Component<{}, {}> {

  public primaryxAxis: AxisModel = { valueType: 'DateTime' };
  public marker = {
    visible: true,
    fill: 'Red', height: 10, width: 10,
    border: { width: 2, color: 'blue' },
  };

  render() {
    return <ChartComponent id='charts'
      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={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  }

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

Customizing Specific Point

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

Source

Preview

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 {
    constructor() {
        super(...arguments);
        this.pointRender = (args) => {
            if (args.point.index === 3) {
                args.fill = 'red';
            }
        };
        this.primaryxAxis = { valueType: 'DateTime' };
        this.marker = { visible: true, height: 10, width: 10 };
    }
    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={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
    }
}
;
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';
import { data } from 'datasource.ts';

class App extends React.Component<{}, {}> {

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

  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={this.marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  }

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

Markers in React Chart component

Marker

Shape

Images

Customization

Customizing Specific Point

See Also