Tooltip in React Chart component

1 Apr 202524 minutes to read

Chart will display details about the points through tooltip, when the mouse is moved over the point

Default tooltip

By default, tooltip is not visible. You can enable the tooltip by setting enable property to true and by injecting Tooltip module into the services.

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, DateTime, Tooltip, DataLabel, StepLineSeries } from '@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const tooltip = { enable: true };
    const marker = { visible: true, width: 10, height: 10 };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} tooltip={tooltip} title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DataLabel, DateTime]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2} type='StepLine' 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,TooltipSettingsModel,
         Legend, DateTime, Tooltip, DataLabel, StepLineSeries}
from'@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const tooltip: TooltipSettingsModel = { enable: true };
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      tooltip={tooltip}
      title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DataLabel, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2}
          type='StepLine' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  
};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let data = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];
export let data: Object[] = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];

Fixed tooltip

By default, tooltip track the mouse movement, but you can set a fixed position for the tooltip by using the location property.

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

function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const tooltip = { enable: true, location: { x: 120, y: 20 } };
    const marker = { visible: true, width: 10, height: 10 };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} tooltip={tooltip} title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Tooltip, DateTime]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2} type='StepLine' 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, TooltipSettingsModel,
  DateTime, Tooltip, StepLineSeries
}
  from '@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const tooltip: TooltipSettingsModel = { enable: true, location: { x: 120, y: 20 } };
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
    primaryXAxis={primaryxAxis}
    tooltip={tooltip}
    title='Unemployment Rates 1975-2010'>
    <Inject services={[StepLineSeries, Tooltip, DateTime]} />
    <SeriesCollectionDirective>
      <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2}
        type='StepLine' marker={marker}>
      </SeriesDirective>
    </SeriesCollectionDirective>
  </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let data = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];
export let data: Object[] = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];

Format the tooltip

By default, tooltip shows information of x and y value in points. In addition to that, you can show more information in tooltip. For example the format ${series.name} ${point.x} shows series name and point x value.

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, DateTime, Tooltip, DataLabel, StepLineSeries } from '@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const tooltip = {
        enable: true, header: 'Unemployment',
        format: '<b>${point.x} : ${point.y}</b>'
    };
    const marker = { visible: true, width: 10, height: 10 };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} tooltip={tooltip} title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DataLabel, DateTime]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2} type='StepLine' 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,TooltipSettingsModel,
         Legend, DateTime, Tooltip, DataLabel, StepLineSeries}
from'@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const tooltip: TooltipSettingsModel = {
    enable: true, header: 'Unemployment',
    format: '<b>${point.x} : ${point.y}</b>'
  };
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      tooltip={tooltip}
      title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DataLabel, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2}
          type='StepLine' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let data = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];
export let data: Object[] = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];

Individual series format

You can format the each series tooltip separately using series tooltipFormat property.

Note: If series tooltipFormat is given, it shows the tooltip for that series in that format, or else it will take tooltip format.

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, SplineSeries } from '@syncfusion/ej2-react-charts';
import { data1, data2, data3 } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'Category' };
    const tooltip = {
        enable: true, header: 'Unemployment',
        format: '<b>${point.x} : ${point.y}</b>'
    };
    const marker = { visible: true, width: 10, height: 10 };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} tooltip={tooltip} title='Unemployment Rates 1975-2010'>
      <Inject services={[SplineSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data1} xName='x' yName='y' name='Max Temp' width={2} type='Spline' marker={marker} tooltipFormat='${point.x}'>
        </SeriesDirective>
        <SeriesDirective dataSource={data2} xName='x' yName='y' name='Avg Temp' width={2} type='Spline' marker={marker} tooltipFormat='${point.y}'>
        </SeriesDirective>
        <SeriesDirective dataSource={data3} xName='x' yName='y' name='Min Temp' width={2} type='Spline' 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,TooltipSettingsModel, Legend, Category, Tooltip, DataLabel, SplineSeries}
from'@syncfusion/ej2-react-charts';
import { data1, data2, data3 } from './datasource';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'Category' };
  const tooltip: TooltipSettingsModel = {
    enable: true, header: 'Unemployment',
    format: '<b>${point.x} : ${point.y}</b>'
  };
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      tooltip={tooltip}
      title='Unemployment Rates 1975-2010'>
      <Inject services={[SplineSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data1} xName='x' yName='y' name='Max Temp' width={2}
          type='Spline' marker={marker} tooltipFormat='${point.x}'>
        </SeriesDirective>
        <SeriesDirective dataSource={data2} xName='x' yName='y' name='Avg Temp' width={2}
          type='Spline' marker={marker} tooltipFormat='${point.y}'>
        </SeriesDirective>
        <SeriesDirective dataSource={data3} xName='x' yName='y' name='Min Temp' width={2}
          type='Spline' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let data1 = [
    { x: 'Sun', y: 15 }, 
    { x: 'Mon', y: 22 },
    { x: 'Tue', y: 32 },
    { x: 'Wed', y: 31 },
    { x: 'Thu', y: 29 }, 
    { x: 'Fri', y: 24 },
    { x: 'Sat', y: 18 }
];

export let data2 = [
    { x: 'Sun', y: 10 }, 
    { x: 'Mon', y: 18 },
    { x: 'Tue', y: 28 },
    { x: 'Wed', y: 28 },
    { x: 'Thu', y: 26 }, 
    { x: 'Fri', y: 20 },
    { x: 'Sat', y: 15 }
];

export let data3 = [
    { x: 'Sun', y: 2 }, 
    { x: 'Mon', y: 12 },
    { x: 'Tue', y: 22 },
    { x: 'Wed', y: 23 },
    { x: 'Thu', y: 19 }, 
    { x: 'Fri', y: 13 },
    { x: 'Sat', y: 8 }
];
export let data1: Object[] = [
    { x: 'Sun', y: 15 }, 
    { x: 'Mon', y: 22 },
    { x: 'Tue', y: 32 },
    { x: 'Wed', y: 31 },
    { x: 'Thu', y: 29 }, 
    { x: 'Fri', y: 24 },
    { x: 'Sat', y: 18 }
];

export let data2: Object[] = [
    { x: 'Sun', y: 10 }, 
    { x: 'Mon', y: 18 },
    { x: 'Tue', y: 28 },
    { x: 'Wed', y: 28 },
    { x: 'Thu', y: 26 }, 
    { x: 'Fri', y: 20 },
    { x: 'Sat', y: 15 }
];

export let data3: Object[] = [
    { x: 'Sun', y: 2 }, 
    { x: 'Mon', y: 12 },
    { x: 'Tue', y: 22 },
    { x: 'Wed', y: 23 },
    { x: 'Thu', y: 19 }, 
    { x: 'Fri', y: 13 },
    { x: 'Sat', y: 8 }
];

Tooltip template

Any HTML elements can be displayed in the tooltip by using the template property of the tooltip. You can use the ${x} and ${y} as place holders in the HTML element to display the x and y values of the corresponding data point.

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, DateTime, Tooltip, DataLabel, StepLineSeries } from '@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const template = chartTemplate;
    const tooltip = {
        enable: true,
        template: template
    };
    function chartTemplate(args) {
        return (<div id="templateWrap">
      <table style={{ width: '100%', margin: '5px', border: '1px solid black', backgroundColor: '#00FFFF' }}>
        <tbody><tr><th colSpan={2}>Unemployment</th></tr>
          <tr><td>{args.x}</td><td>:</td><td>{args.y}</td></tr>
        </tbody>
      </table>
    </div>);
    }
    const marker = { visible: true, width: 10, height: 10 };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} tooltip={tooltip} title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DataLabel, DateTime]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2} type='StepLine' 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,TooltipSettingsModel,
         Legend, DateTime, Tooltip, DataLabel, StepLineSeries}
from'@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const template:any = chartTemplate;
  const tooltip: TooltipSettingsModel = {
    enable: true,
    template: template
  };
  function chartTemplate(args:any){
   return (<div id="templateWrap">
      <table style={{width:'100%',margin: '5px', border: '1px solid black' ,backgroundColor:'#00FFFF'}}>
        <tbody><tr><th colSpan={2}>Unemployment</th></tr>
          <tr><td>{args.x}</td><td>:</td><td>{args.y}</td></tr>
        </tbody>
      </table>
    </div>);
  }
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      tooltip={tooltip}
      title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DataLabel, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2}
          type='StepLine' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>

};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let data = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];
export let data: Object[] = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];

Enable highlight

By setting the enableHighlight property to true, you can highlight all points in the hovered series while dimming points in other series, enhancing focus and clarity.

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

function App() {

  const primaryxAxis = { 
    title: 'Years',
    lineStyle: { width: 0 },
    labelFormat: 'y',
    intervalType: 'Years',
    valueType: 'DateTime',
    edgeLabelPlacement: 'Shift'
  };
  const primaryyAxis = { 
    title: 'Percentage (%)',
    minimum: 0, 
    maximum: 20, 
    interval: 4,
    labelFormat: '{value}%'
  };
  const tooltip = { enable: true, enableHighlight: true };
  const legendSettings = { visible: true };
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      primaryYAxis={primaryyAxis}
      tooltip={tooltip}
      legendSettings={legendSettings}
      title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y' type='StepLine' name='China' width={2} marker={marker}>
        </SeriesDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y1' type='StepLine' name='Australia' width={2} marker={marker}>
        </SeriesDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y2' type='StepLine' name='Japan' width={2} 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 { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, AxisModel, TooltipSettingsModel, LegendSettingsModel, Legend, DateTime, Tooltip, StepLineSeries } from'@syncfusion/ej2-react-charts';
import {chartData} from './datasource';

function App() {

  const primaryxAxis: AxisModel = { 
    title: 'Years',
    lineStyle: { width: 0 },
    labelFormat: 'y',
    intervalType: 'Years',
    valueType: 'DateTime',
    edgeLabelPlacement: 'Shift'
  };
  const primaryyAxis: AxisModel = { 
    title: 'Percentage (%)',
    minimum: 0, 
    maximum: 20, 
    interval: 4,
    labelFormat: '{value}%'
  };
  const tooltip: TooltipSettingsModel = { enable: true, enableHighlight: true };
  const legendSettings: LegendSettingsModel = { visible: true };
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      primaryYAxis={primaryyAxis}
      tooltip={tooltip}
      legendSettings={legendSettings}
      title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y' type='StepLine' name='China' width={2} marker={marker}>
        </SeriesDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y1' type='StepLine' name='Australia' width={2} marker={marker}>
        </SeriesDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y2' type='StepLine' name='Japan' width={2} marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  
};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let chartData = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];
export let chartData: Object[] = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];

Tooltip mapping name

By default, tooltip shows information of x and y value in points. You can show more information from data source in tooltip by using the tooltipMappingName property of the tooltip. You can use the ${point.tooltip} as place holders to display the specified tooltip content.

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Category, Legend, DateTime, Tooltip, DataLabel, ColumnSeries } from '@syncfusion/ej2-react-charts';
import { chartData } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const tooltip = { enable: true, format: '${point.tooltip}' };
    const legendSettings = { visible: false };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} tooltip={tooltip} legendSettings={legendSettings} title='Internet Users in Million – 2016'>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, DateTime, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y' type='Column' tooltipMappingName='country'>
        </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,TooltipSettingsModel,LegendSettingsModel,Category,
         Legend, DateTime, Tooltip, DataLabel, ColumnSeries}
from'@syncfusion/ej2-react-charts';
import {chartData} from './datasource';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const tooltip: TooltipSettingsModel = {enable: true, format: '${point.tooltip}'};
  const legendSettings: LegendSettingsModel = { visible: false};

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      tooltip={tooltip}
      legendSettings={legendSettings}
      title='Internet Users in Million – 2016'>
      <Inject services={[ColumnSeries, Legend, Tooltip, DataLabel, DateTime, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y'
          type='Column' tooltipMappingName='country'>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  
};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let chartData = [
    { x: 'Germany', y: 72, country: 'GER: 72'},
    { x: 'Russia', y: 103.1, country: 'RUS: 103.1'},
    { x: 'Brazil', y: 139.1, country: 'BRZ: 139.1'},
    { x: 'India', y: 462.1, country: 'IND: 462.1'},
    { x: 'China', y: 721.4, country: 'CHN: 721.4'},
    { x: 'United States Of America', y: 286.9, country: 'USA: 286.9'},
    { x: 'Great Britain', y: 115.1, country: 'GBR: 115.1'},
    { x: 'Nigeria', y: 97.2, country: 'NGR: 97.2'}
];
export let chartData: Object[] = [
    { x: 'Germany', y: 72, country: 'GER: 72'},
    { x: 'Russia', y: 103.1, country: 'RUS: 103.1'},
    { x: 'Brazil', y: 139.1, country: 'BRZ: 139.1'},
    { x: 'India', y: 462.1, country: 'IND: 462.1'},
    { x: 'China', y: 721.4, country: 'CHN: 721.4'},
    { x: 'United States Of America', y: 286.9, country: 'USA: 286.9'},
    { x: 'Great Britain', y: 115.1, country: 'GBR: 115.1'},
    { x: 'Nigeria', y: 97.2, country: 'NGR: 97.2'}
];

Customize the appearance of tooltip

The fill and border properties are used to customize the background color and border of the tooltip respectively. The textStyle property in the tooltip is used to customize the font of the tooltip text. The highlightColor property is used to customize the point color while hovering for tooltip.

import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, DateTime, Tooltip, DataLabel, StepLineSeries } from '@syncfusion/ej2-react-charts';
import { data } from './datasource';
function App() {
    const primaryxAxis = { valueType: 'DateTime' };
    const tooltip = {
        enable: true, format: '${series.name} ${point.x} : ${point.y}',
        fill: '#7bb4eb', border: {
            width: 2,
            color: 'grey'
        }
    };
    const marker = { visible: true, width: 10, height: 10 };
    const titlestyle = {
        fontFamily: "Arial", fontStyle: 'italic', fontWeight: 'regular',
        color: "#E27F2D", size: '23px'
    };
    return <ChartComponent id='charts' primaryXAxis={primaryxAxis} tooltip={tooltip} title='Unemployment Rates 1975-2010' highlightColor='red' titleStyle={titlestyle}>
      <Inject services={[StepLineSeries, Legend, Tooltip, DataLabel, DateTime]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2} type='StepLine' 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,TooltipSettingsModel,
         Legend, DateTime, Tooltip, DataLabel, StepLineSeries}
from'@syncfusion/ej2-react-charts';
import { data } from './datasource';

function App() {

  const primaryxAxis: AxisModel = { valueType: 'DateTime' };
  const tooltip: TooltipSettingsModel = {
    enable: true, format: '${series.name} ${point.x} : ${point.y}',
    fill: '#7bb4eb', border: {
      width: 2,
      color: 'grey'
    }
  };
  const marker = { visible: true, width: 10, height: 10 };
  const titlestyle = {
    fontFamily: "Arial", fontStyle: 'italic', fontWeight: 'regular',
    color: "#E27F2D", size: '23px'
  };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      tooltip={tooltip}
      title='Unemployment Rates 1975-2010'
      highlightColor='red'
      titleStyle={titlestyle}>
      <Inject services={[StepLineSeries, Legend, Tooltip, DataLabel, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={data} xName='x' yName='y' name='China' width={2}
          type='StepLine' marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  
};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let data = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];
export let data: Object[] = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];

Closest tooltip

The showNearestTooltip property in the chart tooltip displays tooltips based on the data points closest to the cursor.

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

function App() {

  const primaryxAxis = { 
    title: 'Years',
    lineStyle: { width: 0 },
    labelFormat: 'y',
    intervalType: 'Years',
    valueType: 'DateTime',
    edgeLabelPlacement: 'Shift'
  };
  const primaryyAxis = { 
    title: 'Percentage (%)',
    minimum: 0, 
    maximum: 20, 
    interval: 4,
    labelFormat: '{value}%'
  };
  const tooltip = { enable: true, enableHighlight: true, showNearestTooltip: true };
  const legendSettings = { visible: true };
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      primaryYAxis={primaryyAxis}
      tooltip={tooltip}
      legendSettings={legendSettings}
      title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y' type='StepLine' name='China' width={2} marker={marker}>
        </SeriesDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y1' type='StepLine' name='Australia' width={2} marker={marker}>
        </SeriesDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y2' type='StepLine' name='Japan' width={2} 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 { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, AxisModel, TooltipSettingsModel, LegendSettingsModel, Legend, DateTime, Tooltip, StepLineSeries } from'@syncfusion/ej2-react-charts';
import {chartData} from './datasource';

function App() {

  const primaryxAxis: AxisModel = { 
    title: 'Years',
    lineStyle: { width: 0 },
    labelFormat: 'y',
    intervalType: 'Years',
    valueType: 'DateTime',
    edgeLabelPlacement: 'Shift'
  };
  const primaryyAxis: AxisModel = { 
    title: 'Percentage (%)',
    minimum: 0, 
    maximum: 20, 
    interval: 4,
    labelFormat: '{value}%'
  };
  const tooltip: TooltipSettingsModel = { enable: true, enableHighlight: true, showNearestTooltip: true };
  const legendSettings: LegendSettingsModel = { visible: true };
  const marker = { visible: true, width: 10, height: 10 };

  return <ChartComponent id='charts'
      primaryXAxis={primaryxAxis}
      primaryYAxis={primaryyAxis}
      tooltip={tooltip}
      legendSettings={legendSettings}
      title='Unemployment Rates 1975-2010'>
      <Inject services={[StepLineSeries, Legend, Tooltip, DateTime]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y' type='StepLine' name='China' width={2} marker={marker}>
        </SeriesDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y1' type='StepLine' name='Australia' width={2} marker={marker}>
        </SeriesDirective>
        <SeriesDirective dataSource={chartData} xName='x' yName='y2' type='StepLine' name='Japan' width={2} marker={marker}>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  
};
export default App;
ReactDOM.render(<App />, document.getElementById("charts"));
export let chartData = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];
export let chartData: Object[] = [
    { x: new Date(1975, 0, 1), y: 16,   y1: 10,  y2: 4.5 },
    { x: new Date(1980, 0, 1), y: 12.5, y1: 7.5, y2: 5 },
    { x: new Date(1985, 0, 1), y: 19,   y1: 11,  y2: 6.5 },
    { x: new Date(1990, 0, 1), y: 14.4, y1: 7,   y2: 4.4 },
    { x: new Date(1995, 0, 1), y: 11.5, y1: 8,   y2: 5 },
    { x: new Date(2000, 0, 1), y: 14,   y1: 6,   y2: 1.5 },
    { x: new Date(2005, 0, 1), y: 10,   y1: 3.5, y2: 2.5 },
    { x: new Date(2010, 0, 1), y: 16,   y1: 7,   y2: 3.7 }
];

See also