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Backend API
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 ${isDropZoneActive ? 'dropzone-active' : ''}`}>
{imageSource && <img id="dropzone-image" src={imageSource} alt="" />}
{textVisible && (
<div id="dropzone-text" className="flex-box">
<span>Drag & Drop the desired file</span>
<span>…or click to browse for a file instead.</span>
</div>
)}
<ProgressBar
id="upload-progress"
min={0}
max={100}
width="30%"
showStatus={false}
visible={progressVisible}
value={progressValue}
></ProgressBar>
</div>
<FileUploader
id="file-uploader"
dialogTrigger="#dropzone-external"
dropZone="#dropzone-external"
multiple={false}
allowedFileExtensions={allowedFileExtensions}
uploadMode="instantly"
uploadUrl="https://js.devexpress.com/Demos/NetCore/FileUploader/Upload"
visible={false}
onDropZoneEnter={onDropZoneEnter}
onDropZoneLeave={onDropZoneLeave}
onUploaded={onUploaded}
onProgress={onProgress}
onUploadStarted={onUploadStarted}
></FileUploader>
</div>
);
}
import React, { useCallback, useState } from 'react';
import FileUploader from 'devextreme-react/file-uploader';
import ProgressBar from 'devextreme-react/progress-bar';
const allowedFileExtensions = ['.jpg', '.jpeg', '.gif', '.png'];
export default function App() {
const [isDropZoneActive, setIsDropZoneActive] = useState(false);
const [imageSource, setImageSource] = useState('');
const [textVisible, setTextVisible] = useState(true);
const [progressVisible, setProgressVisible] = useState(false);
const [progressValue, setProgressValue] = useState(0);
const onDropZoneEnter = useCallback(
({ component, dropZoneElement, event }) => {
if (dropZoneElement.id === 'dropzone-external') {
const items = event.originalEvent.dataTransfer.items;
const currentAllowedFileExtensions = component.option('allowedFileExtensions');
const draggedFileExtension = `.${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) => {
if (e.dropZoneElement.id === 'dropzone-external') {
setIsDropZoneActive(false);
}
},
[setIsDropZoneActive],
);
const onUploaded = useCallback(
(e) => {
const { file } = e;
const fileReader = new FileReader();
fileReader.onload = () => {
setIsDropZoneActive(false);
setImageSource(fileReader.result);
};
fileReader.readAsDataURL(file);
setTextVisible(false);
setProgressVisible(false);
setProgressValue(0);
},
[setImageSource, setIsDropZoneActive, setTextVisible, setProgressVisible, setProgressValue],
);
const onProgress = useCallback(
(e) => {
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>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(
<App />,
document.getElementById('app'),
);
window.exports = window.exports || {};
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
jsx: 'react',
},
meta: {
'react': {
'esModule': true,
},
'typescript': {
'exports': 'ts',
},
'devextreme/time_zone_utils.js': {
'esModule': true,
},
'devextreme/localization.js': {
'esModule': true,
},
'devextreme/viz/palette.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
defaultExtension: 'js',
map: {
'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
'react': 'npm:react@17.0.2/umd/react.development.js',
'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',
'prop-types': 'npm:prop-types@15.8.1/prop-types.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@24.1.7/cjs',
'devextreme-react': 'npm:devextreme-react@24.1.7/cjs',
'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.12/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.56/dist/dx-gantt.js',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3',
// SystemJS plugins
'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',
},
packages: {
'devextreme': {
defaultExtension: 'js',
},
'devextreme-react': {
main: 'index.js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/localization/messages': {
format: 'json',
defaultExtension: 'json',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.13/inferno/package.json',
],
babelOptions: {
sourceMaps: false,
stage0: true,
react: true,
},
};
System.config(window.config);
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/24.1.7/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script type="text/javascript" src="config.js"></script>
<script type="text/javascript">
System.import("./index.tsx");
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"></div>
</div>
</body>
</html>
#dropzone-external {
width: 350px;
height: 350px;
background-color: rgb(183 183 183 / 10%);
border-width: 2px;
border-style: dashed;
padding: 10px;
border-color: var(--dx-color-border);
}
#dropzone-external > * {
pointer-events: none;
}
#dropzone-external.dropzone-active {
border-style: solid;
border-color: var(--dx-color-primary);
}
.widget-container > span {
font-size: 22px;
font-weight: bold;
margin-bottom: 16px;
}
#dropzone-image {
max-width: 100%;
max-height: 100%;
}
#dropzone-text > span {
font-weight: 100;
opacity: 0.5;
}
#upload-progress {
display: flex;
margin-top: 10px;
}
.flex-box {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
NOTE
Allowed file extensions: .jpg, .jpeg, .gif, .png
Maximum file size: 4 MB