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.
Feel free to share demo-related thoughts here.
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If you have technical questions, please create a support ticket in the DevExpress Support Center.
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<template>
<div
id="wrapper"
:class="wrapperClassName"
>
<DxLoadPanel
:position="loadPanelPosition"
v-model:visible="loadPanelVisible"
/>
<div id="widget-area">
<DxFileUploader
id="file-uploader"
:chunk-size="200000"
:max-file-size="1048576"
:upload-chunk="uploadChunk"
/>
<div id="request-panel">
<div
class="request-info"
v-for="(request, index) in requests"
:key="index"
>
<div class="parameter-info">
<div class="parameter-name">Method:</div>
<div class="parameter-value dx-theme-accent-as-text-color">{{ request.method }}</div>
</div>
<div class="parameter-info">
<div class="parameter-name">Url path:</div>
<div class="parameter-value dx-theme-accent-as-text-color">{{ request.urlPath }}</div>
</div>
<div class="parameter-info">
<div class="parameter-name">Query string:</div>
<div class="parameter-value dx-theme-accent-as-text-color">{{ request.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/Vue/Light/"
target="_blank"
>
https://js.devexpress.com/Demos/WidgetsGallery/Demo/FileUploader/AzureDirectUploading/Vue/Light/
</a>
to see the demo online.
</div>
</div>
</template>
<script>
import { DxFileUploader } from 'devextreme-vue/file-uploader';
import { DxLoadPanel } from 'devextreme-vue/load-panel';
const endpointUrl = 'https://js.devexpress.com/Demos/Mvc/api/file-manager-azure-access';
export default {
components: {
DxFileUploader,
DxLoadPanel
},
data() {
return {
loadPanelPosition: { of: '#file-uploader' },
loadPanelVisible: true,
wrapperClassName: '',
requests: []
};
},
created() {
const onRequestExecuted = ({ method, urlPath, queryString }) => {
const request = { method, urlPath, queryString };
this.requests.unshift(request);
};
gateway = new AzureGateway(endpointUrl, onRequestExecuted);
fetch('https://js.devexpress.com/Demos/Mvc/api/file-manager-azure-status?widgetType=fileManager')
.then(response => response.json())
.then(result => {
this.wrapperClassName = result.active ? 'show-widget' : 'show-message';
this.loadPanelVisible = false;
});
},
methods: {
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;
}
}
};
let gateway = null;
</script>
<style>
#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;
}
</style>
import { createApp } from 'vue';
import App from './App.vue';
createApp(App).mount('#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/21.1.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.1.5/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.1.5/css/dx-gantt.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>
window.config = {
transpiler: 'plugin-babel',
meta: {
'*.vue': {
loader: 'vue-loader'
},
'devextreme/localization.js': {
"esModule": true
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
'vue': 'npm:vue@3.0.0/dist/vue.esm-browser.js',
'vue-loader': 'npm:dx-systemjs-vue-browser@1.0.15/index.js',
'mitt': 'npm:mitt/dist/mitt.umd.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@21.1.5/cjs',
'devextreme-vue': 'npm:devextreme-vue@21.1.5',
'jszip': 'npm:jszip@3.7.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.3.1/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.1.25/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@3.0.4/dist/dx-gantt.js',
'@devextreme/vdom': 'npm:@devextreme/vdom@1.2.2',
'inferno': 'npm:inferno@7.4.8/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat@7.4.8/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.8/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom@1.0.7/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.8/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode@7.4.8/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class@7.4.8/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras@7.4.8/dist/inferno-extras.min.js',
'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-vue': {
main: 'index.js'
},
'devextreme': {
defaultExtension: 'js'
},
'@devextreme/vdom': {
defaultExtension: 'js'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js'
}
},
packageConfigPaths: [
"npm:@devextreme/*/package.json",
],
babelOptions: {
sourceMaps: false,
stage0: 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
};
}
}
}