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File Uploader

Direct Upload to Azure

The FileUploader component supports direct-upload to blob storages. This demo illustrates how to configure the uploadChunk property to upload a large file directly to Azure Blob Storage without using a user's web server. All APIs that implement access to Azure Blob Storage on the client are stored in the azure-file-system.js file.

To implement file upload logic, use the uploadChunk property to specify how to process a connection request to the storage.

Backend API
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import React from 'react'; import FileUploader from 'devextreme-react/file-uploader'; import { LoadPanel } from 'devextreme-react/load-panel'; const endpointUrl = 'https://js.devexpress.com/Demos/Mvc/api/file-manager-azure-access'; const loadPanelPosition = { of: '#file-uploader' }; class App extends React.Component { constructor() { super(); this.state = { requests: [], loadPanelVisible: true, wrapperClassName: '', }; this.onRequestExecuted = this.onRequestExecuted.bind(this); gateway = new AzureGateway(endpointUrl, this.onRequestExecuted); this.checkAzureStatus(); } render() { return ( <div id="wrapper" className={this.state.wrapperClassName}> <LoadPanel visible={this.state.loadPanelVisible} position={loadPanelPosition} /> <div id="widget-area"> <FileUploader id="file-uploader" chunkSize={200000} maxFileSize={1048576} uploadChunk={this.uploadChunk} /> <div id="request-panel"> { this.state.requests.map((r, i) => <div key={i} className="request-info"> <div className="parameter-info"> <div className="parameter-name">Method:</div> <div className="parameter-value dx-theme-accent-as-text-color">{r.method}</div> </div> <div className="parameter-info"> <div className="parameter-name">Url path:</div> <div className="parameter-value dx-theme-accent-as-text-color">{r.urlPath}</div> </div> <div className="parameter-info"> <div className="parameter-name">Query string:</div> <div className="parameter-value dx-theme-accent-as-text-color">{r.queryString}</div> </div> <br /> </div>) } </div> </div> <div id="message-box"> To run the demo locally, specify your Azure storage account name, access key and container name in the web.config file. Refer to the <a href="https://js.devexpress.com/Demos/WidgetsGallery/Demo/FileUploader/AzureDirectUploading/React/Light/" target="_blank" rel="noopener noreferrer"> https://js.devexpress.com/Demos/WidgetsGallery/Demo/FileUploader/AzureDirectUploading/React/Light/</a> to see the demo online. </div> </div> ); } uploadChunk(file, uploadInfo) { let promise = null; if (uploadInfo.chunkIndex === 0) { promise = gateway.getUploadAccessUrl(file.name).done((accessUrl) => { uploadInfo.customData.accessUrl = accessUrl; }); } else { promise = Promise.resolve(); } promise = promise.then(() => gateway.putBlock( uploadInfo.customData.accessUrl, uploadInfo.chunkIndex, uploadInfo.chunkBlob, )); if (uploadInfo.chunkIndex === uploadInfo.chunkCount - 1) { promise = promise.then(() => gateway.putBlockList( uploadInfo.customData.accessUrl, uploadInfo.chunkCount, )); } return promise; } checkAzureStatus() { fetch('https://js.devexpress.com/Demos/Mvc/api/file-manager-azure-status?widgetType=fileUploader') .then((response) => response.json()) .then((result) => { const className = result.active ? 'show-widget' : 'show-message'; this.setState({ wrapperClassName: className, loadPanelVisible: false, }); }); } onRequestExecuted({ method, urlPath, queryString }) { const request = { method, urlPath, queryString }; this.setState({ requests: [request, ...this.state.requests] }); } } let gateway = null; export default App;
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render( <App />, document.getElementById('app'), );
<!DOCTYPE html> <html> <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=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.3/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.3/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.3/css/dx-gantt.min.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="../azure-file-system.js"></script> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import("./index.js"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>
#widget-area { visibility: hidden; } #message-box { display: none; } .show-widget #widget-area { visibility: visible; } .show-message #widget-area { display: none; } .show-message #message-box { display: block; } #request-panel { min-width: 505px; height: 400px; overflow-x: hidden; overflow-y: auto; padding: 18px; margin-top: 40px; background-color: rgba(191, 191, 191, 0.15); } #request-panel .parameter-info { display: flex; } .request-info .parameter-name { flex: 0 0 100px; } .request-info .parameter-name, .request-info .parameter-value { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
window.config = { transpiler: 'plugin-babel', meta: { 'devextreme/localization.js': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', }, defaultExtension: 'js', map: { '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@15.7.2/prop-types.js', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@21.2.3/cjs', 'devextreme-react': 'npm:devextreme-react@21.2.3', 'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.5.5/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.1.37/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@3.1.24/dist/dx-gantt.js', '@devextreme/vdom': 'npm:@devextreme/vdom@2.2.3', '@devextreme/runtime': 'npm:@devextreme/runtime@2.3.8', 'inferno': 'npm:inferno@7.4.10/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat@7.4.10/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.10/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom@1.0.7/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.10/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode@7.4.10/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class@7.4.10/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras@7.4.10/dist/inferno-extras.min.js', // 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', }, packages: { 'devextreme': { defaultExtension: 'js', }, '@devextreme/vdom': { defaultExtension: 'js', }, 'devextreme-react': { main: 'index.js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@2.3.8/inferno/package.json', ], babelOptions: { sourceMaps: false, stage0: true, react: true, }, }; System.config(window.config);
using DevExtreme.MVC.Demos.Models.FileManagement; using Microsoft.Azure.Storage; using Microsoft.Azure.Storage.Auth; using Microsoft.Azure.Storage.Blob; using System; using System.Net.Http; using System.Web.Http; namespace DevExtreme.MVC.Demos.Controllers.ApiControllers { public class FileUploaderAzureAccessApiController : ApiController { const long MaxBlobSize = 1048576; CloudBlobClient _client; CloudBlobClient Client { get { if(this._client == null) { AzureStorageAccount accountModel = AzureStorageAccount.FileUploader.Value; var credentials = new StorageCredentials(accountModel.AccountName, accountModel.AccessKey); var account = new CloudStorageAccount(credentials, true); this._client = account.CreateCloudBlobClient(); } return this._client; } } CloudBlobContainer _container; CloudBlobContainer Container { get { if(this._container == null) { AzureStorageAccount accountModel = AzureStorageAccount.FileUploader.Value; this._container = Client.GetContainerReference(accountModel.ContainerName); } return this._container; } } [HttpGet] [Route("api/file-uploader-azure-access", Name = "FileUploaderAzureAccessApi")] public HttpResponseMessage Process(string command, string blobName) { object result; try { result = UploadBlob(blobName); } catch { result = CreateErrorResult(); } return Request.CreateResponse(result); } object UploadBlob(string blobName) { if(blobName.Contains("/")) return CreateErrorResult("Invalid blob name."); string prefix = Guid.NewGuid().ToString("N"); string fullBlobName = $"{prefix}_{blobName}"; CloudBlockBlob blob = Container.GetBlockBlobReference(fullBlobName); if(blob.Exists() && blob.Properties.Length > MaxBlobSize) { blob.Delete(); return CreateErrorResult(); } var policy = new SharedAccessBlobPolicy { SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(1), Permissions = SharedAccessBlobPermissions.Write }; string url = blob.Uri + blob.GetSharedAccessSignature(policy, null, null, SharedAccessProtocol.HttpsOnly, null); return CreateSuccessResult(url); } object CreateSuccessResult(string url, string url2 = null) { return new { success = true, accessUrl = url, accessUrl2 = url2 }; } object CreateErrorResult(string error = null) { if(string.IsNullOrEmpty(error)) error = "Unspecified error."; return new { success = false, error = error }; } } }