30 Jan 20233 minutes to read
By using the uploading event, you can get the file size before uploading it to the server.
File object contains the file size in bytes only. You can convert the size to standard formats (KB or MB) using bytesToSize method.
See Also
PowerToys File Explorer add-ons utility for WindowsUploading Files in React from a Form with Drag and Drop on Space JellyHow to Enable Image Preview in Folders (Windows 10/11)Import images from a camera into Preview on Macimport { UploaderComponent } from '@syncfusion/ej2-react-inputs';import * as React from 'react';import * as ReactDOM from "react-dom";export default class App extends React.Component { uploadObj; path = { removeUrl: 'https://services.syncfusion.com/react/production/api/FileUploader/Remove', saveUrl: 'https://services.syncfusion.com/react/production/api/FileUploader/Save' }; onBeforeUpload(args) { // get the file size in bytes const sizeInBytes = args.fileData.size; // get the file size in standard format alert("File size is: " + this.uploadObj.bytesToSize(sizeInBytes)); } render() { return (<UploaderComponent autoUpload={false} ref={upload => { this.uploadObj = upload; }} asyncSettings={this.path} uploading={this.onBeforeUpload = this.onBeforeUpload.bind(this)}/>); }}ReactDOM.render(<App />, document.getElementById('fileupload'));import { UploaderComponent, UploadingEventArgs } from '@syncfusion/ej2-react-inputs';import * as React from 'react';import * as ReactDOM from "react-dom";export default class App extends React.Component<{}, {}> { public uploadObj: UploaderComponent; public path: object = { removeUrl: 'https://services.syncfusion.com/react/production/api/FileUploader/Remove', saveUrl: 'https://services.syncfusion.com/react/production/api/FileUploader/Save' } public onBeforeUpload(args: UploadingEventArgs): void { // get the file size in bytes const sizeInBytes: number = args.fileData.size; // get the file size in standard format alert("File size is: " + this.uploadObj.bytesToSize(sizeInBytes)); } public render(): JSX.Element { return ( <UploaderComponent autoUpload={false} ref = {upload => {this.uploadObj = upload !}} asyncSettings={this.path} uploading={this.onBeforeUpload = this.onBeforeUpload.bind(this)} /> ); }}ReactDOM.render(<App />, document.getElementById('fileupload'));You can also explore React File Upload feature tour page for its groundbreaking features. You can also explore our React File Upload example to understand how to browse the files which you want to upload to the server.
