DevExtreme v24.1 is now available.

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Custom Thumbnails

The FileManager component allows you to provide custom thumbnails. Handle the customizeThumbnail property to specify how the component presents files in folders.

Backend API
$(() => { $('#file-manager').dxFileManager({ name: 'fileManager', fileSystemProvider: fileSystem, itemView: { mode: 'thumbnails', }, height: 450, permissions: { create: true, copy: true, move: true, delete: true, rename: true, upload: true, download: true, }, customizeThumbnail(fileSystemItem) { if (fileSystemItem.isDirectory) { return '../../../../images/thumbnails/folder.svg'; } const fileExtension = fileSystemItem.getFileExtension(); switch (fileExtension) { case '.txt': return '../../../../images/thumbnails/doc-txt.svg'; case '.rtf': return '../../../../images/thumbnails/doc-rtf.svg'; case '.xml': return '../../../../images/thumbnails/doc-xml.svg'; default: return '../../../../images/thumbnails/doc-txt.svg'; } }, }); });
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" 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" /> <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> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.3/css/dx.light.css" /> <script src="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="file-manager"></div> </div> </body> </html>
const fileSystem = [ { name: 'Documents', isDirectory: true, items: [ { name: 'Projects', isDirectory: true, items: [ { name: 'About.rtf', isDirectory: false, size: 1024, }, { name: 'Passwords.rtf', isDirectory: false, size: 2048, }, ], }, { name: 'About.xml', isDirectory: false, size: 1024, }, { name: 'Managers.rtf', isDirectory: false, size: 2048, }, { name: 'ToDo.txt', isDirectory: false, size: 3072, }, ], }, { name: 'Images', isDirectory: true, items: [ { name: 'logo.png', isDirectory: false, size: 20480, }, { name: 'banner.gif', isDirectory: false, size: 10240, }, ], }, { name: 'System', isDirectory: true, items: [ { name: 'Employees.txt', isDirectory: false, size: 3072, }, { name: 'PasswordList.txt', isDirectory: false, size: 5120, }, ], }, { name: 'Description.rtf', isDirectory: false, size: 1024, }, { name: 'Description.txt', isDirectory: false, size: 2048, }, ];