React File Uploader - Chunk Uploading

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

import FileUploader from 'devextreme-react/file-uploader';

​

function getValueInKb(value) {

  return `${(value / 1024).toFixed(0)}kb`;

}

export default function App() {

  const [chunks, setChunks] = useState([]);

  const onUploadProgress = useCallback(

    (e) => {

      const chunk = {

        segmentSize: e.segmentSize,

        bytesLoaded: e.bytesLoaded,

        bytesTotal: e.bytesTotal,

      };

      setChunks([...chunks, chunk]);

    },

    [chunks, setChunks],

  );

  const onUploadStarted = useCallback(() => {

    setChunks([]);

  }, [setChunks]);

  return (

    <React.Fragment>

      <FileUploader

        name="file"

        accept="image/*"

        uploadUrl="https://js.devexpress.com/Demos/WidgetsGalleryDataService/api/ChunkUpload"

        chunkSize={200000}

        onUploadStarted={onUploadStarted}

        onProgress={onUploadProgress}

      />

      <span className="note">

        Allowed file extensions: <span>.jpg, .jpeg, .gif, .png</span>.

      </span>

      <span className="note">

        Maximum file size: <span>4 MB.</span>

      </span>

      <div className="chunk-panel">

        {chunks.map((c, i) => (

          <div key={i}>

            <span>Chunk size:</span>

            <span className="segment-size">{getValueInKb(c.segmentSize)}</span>

            <span>, Uploaded:</span>

            <span className="loaded-size">{getValueInKb(c.bytesLoaded)}</span>

            <span>/</span>

            <span className="total-size">{getValueInKb(c.bytesTotal)}</span>

          </div>

        ))}

      </div>

    </React.Fragment>

  );

}

​

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://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'));

​

<!DOCTYPE html>

<html lang="en">

  <head>↔</head>

​

  <body class="dx-viewport">

    <div class="demo-container">

      <div id="app"></div>

    </div>

  </body>

</html>

​

.chunk-panel {

  width: 505px;

  height: 165px;

  overflow-y: auto;

  padding: 18px;

  margin-top: 40px;

  background-color: rgba(191, 191, 191, 0.15);

}

​

.segment-size,

.loaded-size {

  margin-left: 3px;

  color: var(--dx-color-primary);

}

​

.total-size {

  color: var(--dx-color-primary);

}

​

.note {

  display: block;

  font-size: 10pt;

  color: #484848;

  margin-left: 9px;

}

​

.note > span {

  font-weight: 700;

}

​