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File Uploader

Chunk Uploading

This demo shows how to upload files in chunks. The chunkSize property specifies their size (in this case, 0.2MB). You should ensure the server can process chunks. See an example of the server implementation under the FileUploaderController tab in the ASP.NET MVC version of this demo.

Backend API
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$(() => { $('#file-uploader').dxFileUploader({ name: 'file', accept: 'image/*', uploadUrl: '', chunkSize: 200000, onUploadStarted, onProgress: onUploadProgress, }); }); function onUploadStarted() { getChunkPanel().innerHTML = ''; } function onUploadProgress(e) { getChunkPanel().appendChild(addChunkInfo(e.segmentSize, e.bytesLoaded, e.bytesTotal)); } function addChunkInfo(segmentSize, loaded, total) { const result = document.createElement('DIV'); result.appendChild(createSpan('Chunk size:')); result.appendChild(createSpan(getValueInKb(segmentSize), 'segment-size')); result.appendChild(createSpan(', Uploaded:')); result.appendChild(createSpan(getValueInKb(loaded), 'loaded-size')); result.appendChild(createSpan('/')); result.appendChild(createSpan(getValueInKb(total), 'total-size')); return result; } function getValueInKb(value) { return `${(value / 1024).toFixed(0)}kb`; } function createSpan(text, className) { const result = document.createElement('SPAN'); if (className) { result.className = `${className} dx-theme-accent-as-text-color`; } result.innerText = text; return result; } function getChunkPanel() { return document.querySelector('.chunk-panel'); }
<!DOCTYPE html> <html xmlns=""> <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=""></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="" /> <script src=""></script> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="file-uploader"></div> <span class="note">Allowed file extensions: <span>.jpg, .jpeg, .gif, .png</span>.</span> <span class="note">Maximum file size: <span>4 MB.</span></span> <div class="chunk-panel"> </div> </div> </body> </html>
.chunk-panel { width: 505px; height: 165px; overflow-y: auto; padding: 18px; margin-top: 40px; background-color: rgba(191, 191, 191, 0.15); } .segment-size, .loaded-size { margin-left: 3px; } .note { display: block; font-size: 10pt; color: #484848; margin-left: 9px; } .note > span { font-weight: 700; }