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Tree List
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React File Uploader - Custom Drop Zone
The FileUploader component supports the drag-and-drop functionality to upload files.
In this demo, the dropZone property specifies the HTML element in which you can drag and drop files for upload. The dropZoneEnter and dropZoneLeave events allow you to customize the drop zone when the mouse pointer enters and leaves this zone while dragging the file.
Was this demo helpful?
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Backend API
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import React, { useCallback, useState } from 'react';
import FileUploader, { FileUploaderTypes } from 'devextreme-react/file-uploader';
import ProgressBar from 'devextreme-react/progress-bar';
const allowedFileExtensions = ['.jpg', '.jpeg', '.gif', '.png'];
export default function App() {
const [isDropZoneActive, setIsDropZoneActive] = useState(false);
const [imageSource, setImageSource] = useState<string>('');
const [textVisible, setTextVisible] = useState(true);
const [progressVisible, setProgressVisible] = useState(false);
const [progressValue, setProgressValue] = useState(0);
const onDropZoneEnter = useCallback(({ component, dropZoneElement, event }) => {
if (dropZoneElement.id === 'dropzone-external') {
const items = event.originalEvent.dataTransfer.items;
const currentAllowedFileExtensions = component.option('allowedFileExtensions');
const draggedFileExtension = `.${items[0].type.replace(/^image\//, '')}`;
const isSingleFileDragged = items.length === 1;
const isValidFileExtension = currentAllowedFileExtensions.includes(draggedFileExtension);
if (isSingleFileDragged && isValidFileExtension) {
setIsDropZoneActive(true);
}
}
}, [setIsDropZoneActive]);
const onDropZoneLeave = useCallback((e: FileUploaderTypes.DropZoneLeaveEvent) => {
if (e.dropZoneElement.id === 'dropzone-external') {
setIsDropZoneActive(false);
}
}, [setIsDropZoneActive]);
const onUploaded = useCallback((e: FileUploaderTypes.UploadedEvent) => {
const { file } = e;
const fileReader = new FileReader();
fileReader.onload = () => {
setIsDropZoneActive(false);
setImageSource(fileReader.result as string);
};
fileReader.readAsDataURL(file);
setTextVisible(false);
setProgressVisible(false);
setProgressValue(0);
}, [setImageSource, setIsDropZoneActive, setTextVisible, setProgressVisible, setProgressValue]);
const onProgress = useCallback((e: { bytesLoaded: number; bytesTotal: number; }) => {
setProgressValue((e.bytesLoaded / e.bytesTotal) * 100);
}, [setProgressValue]);
const onUploadStarted = useCallback(() => {
setImageSource('');
setProgressVisible(true);
}, [setImageSource, setProgressVisible]);
return (
<div className="widget-container flex-box">
<span>Profile Picture</span>
<div id="dropzone-external" className={`flex-box ${isDropZoneActive ? 'dropzone-active' : ''}`}>
{imageSource && <img id="dropzone-image" src={imageSource} alt="" />}
{textVisible && (
<div id="dropzone-text" className="flex-box">
<span>Drag & Drop the desired file</span>
<span>…or click to browse for a file instead.</span>
</div>
)}
<ProgressBar
id="upload-progress"
min={0}
max={100}
width="30%"
showStatus={false}
visible={progressVisible}
value={progressValue}
></ProgressBar>
</div>
<FileUploader
id="file-uploader"
dialogTrigger="#dropzone-external"
dropZone="#dropzone-external"
multiple={false}
allowedFileExtensions={allowedFileExtensions}
uploadMode="instantly"
uploadUrl="https://js.devexpress.com/Demos/NetCore/FileUploader/Upload"
visible={false}
onDropZoneEnter={onDropZoneEnter}
onDropZoneLeave={onDropZoneLeave}
onUploaded={onUploaded}
onProgress={onProgress}
onUploadStarted={onUploadStarted}
></FileUploader>
</div>
);
}
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NOTE
Allowed file extensions: .jpg, .jpeg, .gif, .png
Maximum file size: 4 MB