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Get the Total Size of Selected Files in React Uploader component

22 Oct 2021 / 2 minutes to read

You can get the total size of selected files before uploading it to the designated server. This can be achieved by using the selected event. Refer to the following example to calculate the total file size.

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import { SelectedEventArgs, UploaderComponent } 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: '',
      saveUrl: ''
  private dropAreaRef: HTMLElement;
  public onCreated(): void {
      this.uploadObj.dropArea = this.dropAreaRef;
  public onSelect(args: SelectedEventArgs): void {
    let totalSize: number = 0;
    for (const file of args.filesData) {
        totalSize = totalSize + file.size;
    const size: string = this.uploadObj.bytesToSize(totalSize);
    alert("Total select file's size is " + size);

    public render(): JSX.Element {
        return (
        <div className = 'control-pane' ref={dropAreaEle => this.dropAreaRef = dropAreaEle!}>
      <div className='control-section row uploadpreview'>
      <div className='col-lg-9'>
      <div className='upload_wrapper'>
      <div id='preview' />
          <UploaderComponent id='fileUpload' type='file' ref = {upload => {this.uploadObj = upload !}}
          asyncSettings = {this.path}
          selected={ this.onSelect=this.onSelect.bind(this)} created={this.onCreated = this.onCreated.bind(this)} />

ReactDOM.render(<App />, document.getElementById('fileupload'));
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#container {
visibility: hidden;
margin: 0 auto;
width: 400px;
#loader {
color: #008cff;
font-family: 'Helvetica Neue','calibiri';
font-size: 14px;
height: 40px;
left: 45%;
position: absolute;
top: 45%;
width: 30%;

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.