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Close the popup on scroll in React DropDownList component

By using the hidePopup method in DropDownList, you can close the popup on scroll when triggered the windows scroll event.

The following example demonstrate about how to close the popup on scroll.

Source
Preview
index.tsx
index.html
import { DropDownListComponent } from '@syncfusion/ej2-react-dropdowns';
import * as React from 'react';
import * as ReactDOM from 'react-dom';

export default class App extends React.Component<{}, {}> {
  private dropDownListObject: any;
  // define the data with category
  private sportsData: { [key: string]: Object }[] = [
    'Badminton', 'Cricket', 'Football', 'Golf', 'Tennis'];
  constructor(props: any){
      super(props);
     window.addEventListener('scroll', this.handleScroll.bind(this));
  }  
  // on scroll event
  public handleScroll() {
    this.dropDownListObject.hidePopup();
  }
  public render() {
    return (

      // specifies the tag for render the DropDownList component
      <DropDownListComponent id="ddlelement" ref={(scope) => { this.dropDownListObject = scope; }} dataSource={this.sportsData} placeholder="Select a game" />
    );
  }
}
ReactDOM.render(<App />, document.getElementById('sample'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React DropDownList</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-dropdowns/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
    </style>
</head>

<body>
    <div id='sample' style="margin: 20px auto 0; width:250px;">
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>
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