React Data Grid - Local Virtual Scrolling

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

import DataGrid, { Scrolling, Sorting, LoadPanel } from 'devextreme-react/data-grid';

import { generateData } from './data.js';

​

const dataSource = generateData(100000);

const customizeColumns = (columns) => {

  columns[0].width = 70;

};

const App = () => {

  const [loadPanelEnabled, setLoadPanelEnabled] = useState(true);

  const onContentReady = useCallback(() => {

    setLoadPanelEnabled(false);

  }, []);

  return (

    <DataGrid

      height={440}

      dataSource={dataSource}

      keyExpr="id"

      showBorders={true}

      customizeColumns={customizeColumns}

      onContentReady={onContentReady}

    >

      <Sorting mode="none" />

      <Scrolling mode="virtual" />

      <LoadPanel enabled={loadPanelEnabled} />

    </DataGrid>

  );

};

export default App;

​

import React from 'react';

import ReactDOM from 'react-dom';

​

import App from './App.tsx';

​

ReactDOM.render(

  <App />,

  document.getElementById('app'),

);

​

let s = 123456789;

function random() {

  s = (1103515245 * s + 12345) % 2147483647;

  return s % (10 - 1);

}

​

export function generateData(count: number) {

  let i;

  const surnames = ['Smith', 'Johnson', 'Brown', 'Taylor', 'Anderson', 'Harris', 'Clark', 'Allen', 'Scott', 'Carter'];

  const names = ['James', 'John', 'Robert', 'Christopher', 'George', 'Mary', 'Nancy', 'Sandra', 'Michelle', 'Betty'];

  const gender = ['Male', 'Female'];

  const items: ({ id: number; firstName: string; lastName: string; gender: string; birthDate: Date; })[] = [];

  const startBirthDate = Date.parse('1/1/1975');

  const endBirthDate = Date.parse('1/1/1992');

​

  for (i = 0; i < count; i += 1) {

    const birthDate = new Date(startBirthDate + Math.floor(

      (random() * (endBirthDate - startBirthDate)) / 10,

    ));

    birthDate.setHours(12);

​

    const nameIndex = random();

    const item = {

      id: i + 1,

      firstName: names[nameIndex],

      lastName: surnames[random()],

      gender: gender[Math.floor(nameIndex / 5)],

      birthDate,

    };

    items.push(item);

  }

  return items;

}

​

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'));

​

let s = 123456789;

function random() {

  s = (1103515245 * s + 12345) % 2147483647;

  return s % (10 - 1);

}

export function generateData(count) {

  let i;

  const surnames = [

    'Smith',

    'Johnson',

    'Brown',

    'Taylor',

    'Anderson',

    'Harris',

    'Clark',

    'Allen',

    'Scott',

    'Carter',

  ];

  const names = [

    'James',

    'John',

    'Robert',

    'Christopher',

    'George',

    'Mary',

    'Nancy',

    'Sandra',

    'Michelle',

    'Betty',

  ];

  const gender = ['Male', 'Female'];

  const items = [];

  const startBirthDate = Date.parse('1/1/1975');

  const endBirthDate = Date.parse('1/1/1992');

  for (i = 0; i < count; i += 1) {

    const birthDate = new Date(

      startBirthDate + Math.floor((random() * (endBirthDate - startBirthDate)) / 10),

    );

    birthDate.setHours(12);

    const nameIndex = random();

    const item = {

      id: i + 1,

      firstName: names[nameIndex],

      lastName: surnames[random()],

      gender: gender[Math.floor(nameIndex / 5)],

      birthDate,

    };

    items.push(item);

  }

  return items;

}

​

<!DOCTYPE html>

<html lang="en">

  <head>↔</head>

​

  <body class="dx-viewport">

    <div class="demo-container">

      <div id="app"></div>

    </div>

  </body>

</html>

​