Backend API
import React, { useCallback, useState } from 'react';
import FileManager, { Permissions } from 'devextreme-react/file-manager';
import type { FileManagerTypes } from 'devextreme-react/file-manager';
import RemoteFileSystemProvider from 'devextreme/file_management/remote_provider';
import { Popup } from 'devextreme-react/popup';
const remoteProvider = new RemoteFileSystemProvider({
endpointUrl: 'https://js.devexpress.com/Demos/NetCore/api/file-manager-file-system-images',
});
export default function App() {
const [currentPath, setCurrentPath] = useState('Widescreen');
const [popupVisible, setPopupVisible] = useState(false);
const [imageItemToDisplay, setImageItemToDisplay] = useState<{ name?: string, url?: string }>({});
const displayImagePopup = useCallback((e: FileManagerTypes.SelectedFileOpenedEvent) => {
setPopupVisible(true);
setImageItemToDisplay({
name: e.file.name,
url: e.file.dataItem.url,
});
}, [setPopupVisible, setImageItemToDisplay]);
const hideImagePopup = useCallback(() => {
setPopupVisible(false);
}, [setPopupVisible]);
const onCurrentDirectoryChanged = useCallback((e: FileManagerTypes.CurrentDirectoryChangedEvent) => {
const path = e?.component?.option('currentPath');
path && setCurrentPath(path);
}, [setCurrentPath]);
return (
<div>
<FileManager
currentPath={currentPath}
fileSystemProvider={remoteProvider}
onSelectedFileOpened={displayImagePopup}
onCurrentDirectoryChanged={onCurrentDirectoryChanged}>
<Permissions
create={true}
copy={true}
move={true}
delete={true}
rename={true}
upload={true}
download={true}>
</Permissions>
</FileManager>
<Popup
maxHeight={600}
hideOnOutsideClick={true}
showCloseButton={true}
title={imageItemToDisplay.name}
visible={popupVisible}
onHiding={hideImagePopup}
className="photo-popup-content">
<img src={imageItemToDisplay.url} className="photo-popup-image" />
</Popup>
</div>
);
}
import React, { useCallback, useState } from 'react';
import FileManager, { Permissions } from 'devextreme-react/file-manager';
import RemoteFileSystemProvider from 'devextreme/file_management/remote_provider';
import { Popup } from 'devextreme-react/popup';
const remoteProvider = new RemoteFileSystemProvider({
endpointUrl: 'https://js.devexpress.com/Demos/NetCore/api/file-manager-file-system-images',
});
export default function App() {
const [currentPath, setCurrentPath] = useState('Widescreen');
const [popupVisible, setPopupVisible] = useState(false);
const [imageItemToDisplay, setImageItemToDisplay] = useState({});
const displayImagePopup = useCallback(
(e) => {
setPopupVisible(true);
setImageItemToDisplay({
name: e.file.name,
url: e.file.dataItem.url,
});
},
[setPopupVisible, setImageItemToDisplay],
);
const hideImagePopup = useCallback(() => {
setPopupVisible(false);
}, [setPopupVisible]);
const onCurrentDirectoryChanged = useCallback(
(e) => {
const path = e?.component?.option('currentPath');
path && setCurrentPath(path);
},
[setCurrentPath],
);
return (
<div>
<FileManager
currentPath={currentPath}
fileSystemProvider={remoteProvider}
onSelectedFileOpened={displayImagePopup}
onCurrentDirectoryChanged={onCurrentDirectoryChanged}
>
<Permissions
create={true}
copy={true}
move={true}
delete={true}
rename={true}
upload={true}
download={true}
></Permissions>
</FileManager>
<Popup
maxHeight={600}
hideOnOutsideClick={true}
showCloseButton={true}
title={imageItemToDisplay.name}
visible={popupVisible}
onHiding={hideImagePopup}
className="photo-popup-content"
>
<img
src={imageItemToDisplay.url}
className="photo-popup-image"
/>
</Popup>
</div>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(
<App />,
document.getElementById('app'),
);
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>
<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=5.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx-gantt.min.css" />
<link rel="stylesheet" type="text/css" href="./bundle.css" />
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"></div>
</div>
<script src="bundles/vendor/react.vendor.js"></script>
<script src="./bundle.js"></script>
</body>
</html>
.photo-popup-content {
text-align: center;
}
.photo-popup-content .photo-popup-image {
height: 100%;
max-width: 100%;
}
using DevExtreme.AspNet.Mvc.FileManagement;
using System;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Web;
using System.Web.Hosting;
using System.Web.Http;
using System.Web.Mvc;
namespace DevExtreme.MVC.Demos.Controllers.ApiControllers {
public class FileManagerImagesApiController : ApiController {
static readonly string SampleImagesRelativePath = Path.Combine("Content", "SampleData", "SampleImages");
[System.Web.Http.AcceptVerbs("GET", "POST")]
[System.Web.Http.Route("api/file-manager-file-system-images", Name = "FileManagementImagesApi")]
public object FileSystem() {
var request = new HttpContextWrapper(HttpContext.Current).Request;
FileSystemCommand command;
Enum.TryParse(request["command"], out command);
string arguments = request["arguments"];
var config = new FileSystemConfiguration {
Request = request,
FileSystemProvider = new PhysicalFileSystemProvider(
Path.Combine(HostingEnvironment.ApplicationPhysicalPath, SampleImagesRelativePath),
(fileSystemItem, clientItem) => {
if(!clientItem.IsDirectory)
clientItem.CustomFields["url"] = GetFileItemUrl(fileSystemItem);
}
),
//uncomment the code below to enable file/directory management
//AllowCopy = true,
//AllowCreate = true,
//AllowMove = true,
//AllowDelete = true,
//AllowRename = true,
//AllowUpload = true,
AllowDownload = true,
TempDirectory = HttpContext.Current.Server.MapPath("~/App_Data/UploadTemp")
};
var processor = new FileSystemCommandProcessor(config);
var commandResult = processor.Execute(command, arguments);
var result = commandResult.GetClientCommandResult();
return command == FileSystemCommand.Download && commandResult.Success ? CreateDownloadResponse(result) : Request.CreateResponse(result);
}
string GetFileItemUrl(FileSystemInfo fileSystemItem) {
var relativeUrl = "~/" + fileSystemItem.FullName
.Replace(HostingEnvironment.ApplicationPhysicalPath, "")
.Replace(Path.DirectorySeparatorChar, '/');
return Url.Content(relativeUrl);
}
HttpResponseMessage CreateDownloadResponse(object result) {
var fileContent = result as FileStreamResult;
if(fileContent == null)
return Request.CreateResponse(result);
var response = new HttpResponseMessage() {
Content = new StreamContent(fileContent.FileStream)
};
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") {
FileName = fileContent.FileDownloadName
};
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
return response;
}
}
}
The component's default security settings provide read-only access to files and directories. Use the permissions property to deny or allow a user to copy, create, move, delete, rename, upload, and download files and directories. You can also specify file restrictions: allowed file extensions (allowedFileExtensions), chunk size (chunkSize) and maximum file size (maxFileSize).
Use the component's itemView property or the view switcher on the toolbar to display file system items as a detailed list or customizable thumbnails.
This demo contains commented out code lines that enable file modification operations. You can uncomment them and configure if necessary.