Change caret icon in React Drop down button component

2 Mar 20264 minutes to read

Customize the dropdown caret icon based on the popup state using the beforeOpen and beforeClose events. These events allow you to change the icon appearance when the popup opens or closes.

The following example demonstrates how to update the caret icon dynamically by adding or removing the e-caret-up class in the beforeOpen and beforeClose events:

app.jsx

import { enableRipple } from '@syncfusion/ej2-base';
import { DropDownButtonComponent } from '@syncfusion/ej2-react-splitbuttons';
import * as React from 'react';
import * as ReactDom from 'react-dom';
enableRipple(true);
// To render DropDownButton.
function App() {
    let ddb;
    let items = [
        {
            text: 'Cut'
        },
        {
            text: 'Copy'
        },
        {
            text: 'Paste'
        }
    ];
    // To update up arrow with `e-caret-up` class.
    function beforeOpen() {
        ddb.cssClass = 'e-caret-up';
    }
    // To remove `e-caret-up` class.
    function beforeClose() {
        ddb.cssClass = '';
    }
    return (<div>
        <DropDownButtonComponent ref={(scope) => { ddb = scope; }} items={items} beforeOpen={beforeOpen} beforeClose={beforeClose}> Clipboard</DropDownButtonComponent>
    </div>);
}
export default App;
ReactDom.render(<App />, document.getElementById('button'));

app.tsx

import { enableRipple } from '@syncfusion/ej2-base';
import { DropDownButtonComponent, ItemModel } from '@syncfusion/ej2-react-splitbuttons';
import * as React from 'react';
import * as ReactDom from 'react-dom';

enableRipple(true);

// To render DropDownButton.
function App() {
  let ddb: DropDownButtonComponent;
  let items: ItemModel[] = [
    {
      text: 'Cut'
    },
    {
      text: 'Copy'
    },
    {
      text: 'Paste'
    }];
  // To update up arrow with `e-caret-up` class.
  function beforeOpen() {
    ddb.cssClass = 'e-caret-up';
  }
  // To remove `e-caret-up` class.
  function beforeClose() {
    ddb.cssClass = '';
  }

  return (
    <div>
      <DropDownButtonComponent ref={(scope) => { ddb = scope as DropDownButtonComponent; }} items={items} beforeOpen={beforeOpen} beforeClose={beforeClose}> Clipboard</DropDownButtonComponent>
    </div>
  );
}
export default App;
ReactDom.render(<App />, document.getElementById('button'));