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Remove an item from DropDownList in React DropDownList component

05 May 2021 / 2 minutes to read

The following example demonstrate about how to remove an item from DropDownList.

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index.tsx
index.html
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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<{}, {}> {
  // define the array of data
   private sportsData: { [key: string]: Object }[] = [
        { Id: 'game1', Game: 'Badminton' },
        { Id: 'game2', Game: 'Football' },
        { Id: 'game3', Game: 'Tennis' }
    ];

    // maps the appropriate column to fields property
    private fields: object = { text: 'Game', value: 'Id' };
    private dropDownListObject:any;
    public onclick(){
         if (this.dropDownListObject.list) {
            // Remove the selected value if 0th index selected
          if (this.dropDownListObject.index === 0) {
             this.dropDownListObject.value = null;
             this.dropDownListObject.dataBind();
          }
            // remove first item in list
          (this.dropDownListObject.list.querySelectorAll('li')[0]).remove();
          if (!this.dropDownListObject.list.querySelectorAll('li')[0]) {
                this.dropDownListObject.dataSource = [];
                // enable the nodata template when no data source is empty.
                this.dropDownListObject.list.classList.add('e-nodata');
           }
           } else {
            // remove first item in list
            this.dropDownListObject.dataSource.splice(0, 1);
           }

    }
    public render() {
        return (
             // specifies the tag for render the DropDownList component
             <div>
            <DropDownListComponent id="ddlelement" ref={(scope) => { this.dropDownListObject = scope; }} dataSource={this.sportsData} fields={this.fields} placeholder="Select a game" />
            <button id='btn' className="e-control e-btn" onClick={this.onclick = this.onclick.bind(this)}>
            Remove 0th item </button>
      </div>
        );
  }
}
ReactDOM.render(<App />, document.getElementById('sample'));
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<!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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