React Charts - API - Display a Tooltip

import React, { useCallback, useRef, useState } from 'react';

import PieChart, {

  Series, Tooltip, Size, Legend,

} from 'devextreme-react/pie-chart';

import { SelectBox } from 'devextreme-react/select-box';

import { populationData, regionLabel } from './data.js';

​

const customizeTooltip = (pointInfo) => ({

  text: `${pointInfo.argumentText}<br/>${pointInfo.valueText}`,

});

function App() {

  const [selectedRegion, setSelectedRegion] = useState(null);

  const pieChartRef = useRef(null);

  const showTooltip = useCallback(

    (point) => {

      point.showTooltip();

      setSelectedRegion(point.argument);

    },

    [setSelectedRegion],

  );

  const onPointClick = useCallback(

    ({ target: point }) => {

      showTooltip(point);

    },

    [showTooltip],

  );

  const onRegionChanged = useCallback(

    ({ value }) => {

      const point = pieChartRef.current.instance().getAllSeries()[0].getPointsByArg(value)[0];

      showTooltip(point);

    },

    [showTooltip],

  );

  return (

    <React.Fragment>

      <PieChart

        ref={pieChartRef}

        dataSource={populationData}

        onPointClick={onPointClick}

        type="doughnut"

        palette="Soft Pastel"

        title="The Population of Continents and Regions"

      >

        <Series argumentField="region" />

        <Size height={350} />

        <Tooltip

          enabled={false}

          format="millions"

          customizeTooltip={customizeTooltip}

        />

        <Legend visible={false} />

      </PieChart>

      <div className="controls-pane">

        <SelectBox

          width={250}

          dataSource={populationData}

          inputAttr={regionLabel}

          displayExpr="region"

          valueExpr="region"

          placeholder="Choose region"

          value={selectedRegion}

          onValueChanged={onRegionChanged}

        />

      </div>

    </React.Fragment>

  );

}

export default App;

​

import React from 'react';

import ReactDOM from 'react-dom';

​

import App from './App.tsx';

​

ReactDOM.render(

  <App />,

  document.getElementById('app'),

);

​

export const populationData = [{

  region: 'Asia',

  val: 4119626293,

}, {

  region: 'Africa',

  val: 1012956064,

}, {

  region: 'Northern America',

  val: 344124520,

}, {

  region: 'Latin America and the Caribbean',

  val: 590946440,

}, {

  region: 'Europe',

  val: 727082222,

}, {

  region: 'Oceania',

  val: 35104756,

}];

​

export const regionLabel = { 'aria-label': 'Region' };

​

window.exports = window.exports || {};

window.config = {

  transpiler: 'ts',

  typescriptOptions: {

    module: 'system',

    emitDecoratorMetadata: true,

    experimentalDecorators: true,

    jsx: 'react',

  },

  meta: {

    'react': {

      'esModule': true,

    },

    'typescript': {

      'exports': 'ts',

    },

    'devextreme/time_zone_utils.js': {

      'esModule': true,

    },

    'devextreme/localization.js': {

      'esModule': true,

    },

    'devextreme/viz/palette.js': {

      'esModule': true,

    },

    'openai': {

      'esModule': true,

    },

  },

  paths: {

    'npm:': 'https://unpkg.com/',

    'bundles:': 'bundles/',

    'externals:': 'bundles/externals/',

  },

  defaultExtension: 'js',

  map: {

    'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',

    'typescript': 'npm:typescript@4.2.4/lib/typescript.js',

    'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',

    'react': 'npm:react@17.0.2/umd/react.development.js',

    'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',

    'prop-types': 'npm:prop-types/prop-types.js',

    'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',

    'luxon': 'npm:luxon@3.4.4/build/global/luxon.min.js',

    'es6-object-assign': 'npm:es6-object-assign',

    'devextreme': 'npm:devextreme@24.2.6/cjs',

    'devextreme-react': 'npm:devextreme-react@24.2.6/cjs',

    'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',

    'devexpress-diagram': 'npm:devexpress-diagram@2.2.15/dist/dx-diagram.js',

    'devexpress-gantt': 'npm:devexpress-gantt@4.1.60/dist/dx-gantt.js',

    '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12',

    'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',

    'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',

    'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',

    'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',

    'inferno-hydrate': 'npm:inferno-hydrate/dist/inferno-hydrate.min.js',

    'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',

    'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',

    'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',

    'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3',

    // SystemJS plugins

    'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',

    'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',

    // Prettier

    'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',

    'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',

  },

  packages: {

    'devextreme': {

      defaultExtension: 'js',

    },

    'devextreme-react': {

      main: 'index.js',

    },

    'devextreme/events/utils': {

      main: 'index',

    },

    'devextreme/common/core/events/utils': {

      main: 'index',

    },

    'devextreme/localization/messages': {

      format: 'json',

      defaultExtension: 'json',

    },

    'devextreme/events': {

      main: 'index',

    },

    'es6-object-assign': {

      main: './index.js',

      defaultExtension: 'js',

    },

  },

  packageConfigPaths: [

    'npm:@devextreme/*/package.json',

    'npm:@devextreme/runtime@3.0.12/inferno/package.json',

  ],

  babelOptions: {

    sourceMaps: false,

    stage0: true,

    react: true,

  },

};

System.config(window.config);

​

import React from 'react';

import ReactDOM from 'react-dom';

import App from './App.js';

​

ReactDOM.render(<App />, document.getElementById('app'));

​

export const populationData = [

  {

    region: 'Asia',

    val: 4119626293,

  },

  {

    region: 'Africa',

    val: 1012956064,

  },

  {

    region: 'Northern America',

    val: 344124520,

  },

  {

    region: 'Latin America and the Caribbean',

    val: 590946440,

  },

  {

    region: 'Europe',

    val: 727082222,

  },

  {

    region: 'Oceania',

    val: 35104756,

  },

];

export const regionLabel = { 'aria-label': 'Region' };

​

<!DOCTYPE html>

<html lang="en">

  <head>↔</head>

​

  <body class="dx-viewport">

    <div class="demo-container">

      <div id="app"></div>

    </div>

  </body>

</html>

​

.controls-pane {

  margin-top: 20px;

  text-align: center;

}

​

.dx-selectbox {

  display: inline-block;

}

​