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.
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If you have technical questions, please create a support ticket in the DevExpress Support Center.
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$(() => {
const loadPanel = $('#load-panel').dxLoadPanel({
position: { of: '#file-uploader' },
}).dxLoadPanel('instance');
$.ajax({
url: 'https://js.devexpress.com/Demos/Mvc/api/file-manager-azure-status?widgetType=fileUploader',
success(result) {
const className = result.active ? 'show-widget' : 'show-message';
$('#wrapper').addClass(className);
loadPanel.hide();
},
});
const endpointUrl = 'https://js.devexpress.com/Demos/Mvc/api/file-uploader-azure-access';
gateway = new AzureGateway(endpointUrl, onRequestExecuted);
$('#file-uploader').dxFileUploader({
chunkSize: 200000,
maxFileSize: 1048576,
uploadChunk,
});
});
function uploadChunk(file, uploadInfo) {
let deferred = null;
if (uploadInfo.chunkIndex === 0) {
deferred = gateway.getUploadAccessUrl(file.name).done((accessUrl) => {
uploadInfo.customData.accessUrl = accessUrl;
});
} else {
deferred = $.Deferred().resolve().promise();
}
deferred = deferred.then(() => gateway.putBlock(
uploadInfo.customData.accessUrl,
uploadInfo.chunkIndex,
uploadInfo.chunkBlob,
));
if (uploadInfo.chunkIndex === uploadInfo.chunkCount - 1) {
deferred = deferred.then(() => gateway.putBlockList(
uploadInfo.customData.accessUrl,
uploadInfo.chunkCount,
));
}
return deferred.promise();
}
function onRequestExecuted(e) {
$('<div>').addClass('request-info').append(
createParameterInfoDiv('Method:', e.method),
createParameterInfoDiv('Url path:', e.urlPath),
createParameterInfoDiv('Query string:', e.queryString),
$('<br>'),
)
.prependTo('#request-panel');
}
function createParameterInfoDiv(name, value) {
return $('<div>').addClass('parameter-info').append(
$('<div>').addClass('parameter-name').text(name),
$('<div>').addClass('parameter-value dx-theme-accent-as-text-color').text(value).attr('title', value),
);
}
let gateway = null;
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<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" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<script src="../azure-file-system.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.4/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.4/css/dx.light.css" />
<script src="https://cdn3.devexpress.com/jslib/21.2.4/js/dx.all.js"></script>
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="data.js"></script>
<script src="index.js"></script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="wrapper">
<div id="widget-area">
<div id="file-uploader"></div>
<div id="request-panel"></div>
</div>
<div id="load-panel"></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/jQuery/Light/" target="_blank">
https://js.devexpress.com/Demos/WidgetsGallery/Demo/FileUploader/AzureDirectUploading/jQuery/Light/</a
>
to see the demo online.
</div>
</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;
}
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
};
}
}
}