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Achieve Invisible Upload in React Uploader component

You can achieve the invisible upload feature by using the selected event in uploader component. Refer to the following example.

Source
Preview
index.tsx
style.css
import { createElement } from '@syncfusion/ej2-base';
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: 'https://ej2.syncfusion.com/services/api/uploadbox/Remove',
      saveUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Save'
  }
  private dropAreaRef: HTMLElement;
  private previewRef: HTMLElement;
  public onCreated(): void {
      this.uploadObj.dropArea = this.dropAreaRef;
      this.uploadObj.dataBind();
  }
  public onupload(args: SelectedEventArgs){
  for(const i of args.filesData){
          const liparentDiv = createElement('div',  { className: 'image-list'});
          const liImage = createElement('img',  { className: 'image'});
          liparentDiv.appendChild(liImage);
          this.readURL(liImage, i);
          this.previewRef.appendChild(liparentDiv);
      }
      args.cancel=true;

  }
  public readURL(liImage: HTMLElement, file: any): void {
      const imgPreview: HTMLImageElement = liImage as HTMLImageElement;
      const imageFile: File = file.rawFile;
      const reader: FileReader = new FileReader();
      reader.addEventListener( 'load', () => {
          imgPreview.src = reader.result as string;
      }, false);
      if (imageFile) {
          reader.readAsDataURL(imageFile);
      }
  };
  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' ref={previewEle => this.previewRef = previewEle!}/>
            {/* Render Uploader */}
            <UploaderComponent id='fileUpload' type='file' ref = {upload => {this.uploadObj = upload !}}
            asyncSettings = {this.path}
            selected={ this.onupload=this.onupload.bind(this)} locale= {'en-US'} allowedExtensions= '.png, .jpg, .jpeg' created={this.onCreated = this.onCreated.bind(this)} />
        </div>
        </div>
        </div>
      </div>
        )
    }
}

ReactDOM.render(<App />, document.getElementById('fileupload'));
#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%;
}

#preview {
  border: 2px dashed #ddd;
  padding: 15px;
  margin-bottom: 15px;
}

.image-list {
  width: 134px;
  height: 117px;
  margin-right: 4px;
  border: 1px solid lightgrey;
  display: inline-block;
}

.image {
  width: 134px;
  height: 117px;
  margin-right: 4px;
  display: inline-block;
}

.e-control {
  border : 0;
}

.e-control ul {
  border: 1px solid #ddd;
}

.e-control .e-file-select,
.e-control .e-file-drop {
  display: none;
}