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Clear the selected item in DropDownList

You can clear the selected item in the below two different ways.

By clicking on the clear icon which is shown in DropDownList element, you can clear the selected item in DropDownList through interaction. By using showClearButton property, you can enable the clear icon in DropDownList element.

Through programmatic you can set null value to anyone of the index, text or value property to clear the selected item in DropDownList.

The following example demonstrate about how to clear the selected item in DropDownList.

Source
Preview
app.ts
index.html
import { DropDownList } from '@syncfusion/ej2-dropdowns';
import { Button } from '@syncfusion/ej2-buttons';

// define the array of data
let sportsData: string[] = ['Badminton', 'Cricket', 'Football', 'Golf', 'Tennis'];

// initialize DropDownList component
let dropDownListObject: DropDownList = new DropDownList({
    //set the data to dataSource property
    dataSource: sportsData,
    // set placeholder to DropDownList input element
    placeholder: "Select a game",
    //enable the clear icon
    showClearButton: true
});
// render initialized DropDownList
dropDownListObject.appendTo('#ddlelement');

// Set null value to value property for clear the selected item
document.getElementById('btn').onclick = () => {
  dropDownListObject.value = null;
}
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 DropDownList</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="styles.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-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>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container' style="margin:0 auto; width:250px;">
        <br>
        <input type="text" id='ddlelement' />
    </div>
    <div style='padding: 50px'>
      <button id='btn' class="e-control e-btn"> Set null to value property</button>
    </div>
</body>

</html>