Backend API
        
    import React, { useCallback, useState } from 'react';
import RangeSelector, {
  Margin, Scale, MinorTick, Marker, Label, Behavior, SliderMarker, type RangeSelectorTypes, IBehaviorProps,
} from 'devextreme-react/range-selector';
import { SelectBox } from 'devextreme-react/select-box';
const startValue = new Date(2011, 0, 1);
const endValue = new Date(2011, 11, 31);
const behaviorModes: (IBehaviorProps['valueChangeMode'])[] = ['onHandleMove', 'onHandleRelease'];
const valueChangeModeLabel = { 'aria-label': 'Value Change Mode' };
function App() {
  const [workingDaysCount, setWorkingDaysCount] = useState(
    calculateWorkdays([startValue, endValue]),
  );
  const [behaviorMode, setBehaviorMode] = useState(behaviorModes[0]);
  const processRange = useCallback((e: RangeSelectorTypes.ValueChangedEvent) => {
    setWorkingDaysCount(calculateWorkdays(e.value));
  }, [setWorkingDaysCount]);
  const setBehavior = useCallback((data) => {
    setBehaviorMode(data.value);
  }, [setBehaviorMode]);
  return (
    <div id="range-selector-demo">
      <RangeSelector
        id="range-selector"
        title="Calculate the Working Days Count in a Date Period"
        onValueChanged={processRange}
      >
        <Margin top={50} />
        <Scale startValue={startValue} endValue={endValue} minorTickInterval="day" tickInterval="month">
          <MinorTick visible={false} />
          <Marker visible={false} />
          <Label format="MMM" />
        </Scale>
        <Behavior valueChangeMode={behaviorMode} />
        <SliderMarker format="dd EEEE" />
      </RangeSelector>
      <h2>Working days count: {workingDaysCount}</h2>
      <div className="options">
        <div className="caption">Options</div>
        <div className="option">
          <span>Handle Range Changes </span>
          <SelectBox
            dataSource={behaviorModes}
            width={210}
            inputAttr={valueChangeModeLabel}
            value={behaviorMode}
            onValueChanged={setBehavior}
          />
        </div>
      </div>
    </div>
  );
}
function calculateWorkdays([start, end]: (string | number | Date)[]) {
  const currentDate = new Date(start);
  let workingDaysCount = 0;
  while (currentDate <= end) {
    if (currentDate.getDay() > 0 && currentDate.getDay() < 6) {
      workingDaysCount += 1;
    }
    currentDate.setDate(currentDate.getDate() + 1);
  }
  return workingDaysCount;
}
export default App;
    
    import React, { useCallback, useState } from 'react';
import RangeSelector, {
  Margin,
  Scale,
  MinorTick,
  Marker,
  Label,
  Behavior,
  SliderMarker,
} from 'devextreme-react/range-selector';
import { SelectBox } from 'devextreme-react/select-box';
const startValue = new Date(2011, 0, 1);
const endValue = new Date(2011, 11, 31);
const behaviorModes = ['onHandleMove', 'onHandleRelease'];
const valueChangeModeLabel = { 'aria-label': 'Value Change Mode' };
function App() {
  const [workingDaysCount, setWorkingDaysCount] = useState(
    calculateWorkdays([startValue, endValue]),
  );
  const [behaviorMode, setBehaviorMode] = useState(behaviorModes[0]);
  const processRange = useCallback(
    (e) => {
      setWorkingDaysCount(calculateWorkdays(e.value));
    },
    [setWorkingDaysCount],
  );
  const setBehavior = useCallback(
    (data) => {
      setBehaviorMode(data.value);
    },
    [setBehaviorMode],
  );
  return (
    <div id="range-selector-demo">
      <RangeSelector
        id="range-selector"
        title="Calculate the Working Days Count in a Date Period"
        onValueChanged={processRange}
      >
        <Margin top={50} />
        <Scale
          startValue={startValue}
          endValue={endValue}
          minorTickInterval="day"
          tickInterval="month"
        >
          <MinorTick visible={false} />
          <Marker visible={false} />
          <Label format="MMM" />
        </Scale>
        <Behavior valueChangeMode={behaviorMode} />
        <SliderMarker format="dd EEEE" />
      </RangeSelector>
      <h2>Working days count: {workingDaysCount}</h2>
      <div className="options">
        <div className="caption">Options</div>
        <div className="option">
          <span>Handle Range Changes </span>
          <SelectBox
            dataSource={behaviorModes}
            width={210}
            inputAttr={valueChangeModeLabel}
            value={behaviorMode}
            onValueChanged={setBehavior}
          />
        </div>
      </div>
    </div>
  );
}
function calculateWorkdays([start, end]) {
  const currentDate = new Date(start);
  let workingDaysCount = 0;
  while (currentDate <= end) {
    if (currentDate.getDay() > 0 && currentDate.getDay() < 6) {
      workingDaysCount += 1;
    }
    currentDate.setDate(currentDate.getDate() + 1);
  }
  return workingDaysCount;
}
export default App;
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(
  <App />,
  document.getElementById('app'),
);
    
    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://cdn.jsdelivr.net/npm/',
    '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@link:../../packages/devextreme/artifacts/npm/devextreme/cjs',
    'devextreme-react': 'npm:devextreme-react@link:../../packages/devextreme-react/npm/cjs',
    'devextreme-quill': 'npm:devextreme-quill@1.7.6/dist/dx-quill.min.js',
    'devexpress-diagram': 'npm:devexpress-diagram@2.2.24/dist/dx-diagram.js',
    'devexpress-gantt': 'npm:devexpress-gantt@4.1.64/dist/dx-gantt.js',
    'inferno': 'npm:inferno@8.2.3/dist/inferno.min.js',
    'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
    'inferno-create-element': 'npm:inferno-create-element@8.2.3/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',
    '@preact/signals-core': 'npm:@preact/signals-core@1.8.0/dist/signals-core.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-react/common': {
      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',
  ],
  babelOptions: {
    sourceMaps: false,
    stage0: true,
    react: true,
  },
};
System.config(window.config);
// eslint-disable-next-line
const useTgzInCSB = ['openai'];
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
    
    <!DOCTYPE html>
<html lang="en">
  <head>
    <title>DevExtreme Demo</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" />
    <link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/25.1.6/css/dx.light.css" />
    <link rel="stylesheet" type="text/css" href="styles.css" />
    <script src="https://cdn.jsdelivr.net/npm/core-js@2.6.12/client/shim.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/systemjs@0.21.3/dist/system.js"></script>
    <script type="text/javascript" src="config.js"></script>
    <script type="text/javascript">
      System.import("./index.tsx");
    </script>
  </head>
  <body class="dx-viewport">
    <div class="demo-container">
      <div id="app"></div>
    </div>
  </body>
</html>
    
    #range-selector {
  height: 200px;
}
h2 {
  text-align: center;
}
.options {
  padding: 20px;
  background-color: rgba(191, 191, 191, 0.15);
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}
.option {
  margin-top: 10px;
}
.caption {
  font-size: 18px;
  font-weight: 500;
}
.option > span {
  margin-right: 10px;
}
.option > .dx-widget {
  display: inline-block;
  vertical-align: middle;
}