Chunk Uploading

import React from 'react'; import { FileUploader } from 'devextreme-react'; class App extends React.Component { constructor(props) { super(props); this.state = { chunks: [] }; this.onUploadProgress = this.onUploadProgress.bind(this); this.onUploadStarted = this.onUploadStarted.bind(this); } render() { return ( <React.Fragment> <FileUploader name="file" accept="image/*" uploadUrl="https://js.devexpress.com/Demos/WidgetsGalleryDataService/api/ChunkUpload" chunkSize={200000} onUploadStarted={this.onUploadStarted} onProgress={this.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"> { this.state.chunks.map((c, i) => { return <div key={i}> <span>Chunk size:</span> <span className="segment-size dx-theme-accent-as-text-color">{this.getValueInKb(c.segmentSize)}</span> <span>, Uploaded:</span> <span className="loaded-size dx-theme-accent-as-text-color">{this.getValueInKb(c.bytesLoaded)}</span> <span>/</span> <span className="total-size dx-theme-accent-as-text-color">{this.getValueInKb(c.bytesTotal)}</span> </div>; }) } </div> </React.Fragment> ); } onUploadProgress(e) { const chunk = { segmentSize: e.segmentSize, bytesLoaded: e.bytesLoaded, bytesTotal: e.bytesTotal }; this.setState({ chunks: [...this.state.chunks, chunk] }); } onUploadStarted() { this.setState({ chunks: [] }); } getValueInKb(value) { return `${(value / 1024).toFixed(0)}kb`; } } export default App;