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Enable ripple

Ripple can be enabled by importing rippleEffect method from ej2-base and initialize rippleEffect with .e-btn-group element, and selector as e-btn.

The following example illustrates how to enable ripple for ButtonGroup.

Source
Preview
app.ts
index.html
styles.css
import { rippleEffect, enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

// To enable ripple in ButtonGroup.
let button: HTMLElement = document.querySelector('.e-btn-group');
rippleEffect(button, { selector: '.e-btn' });
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Button-Group</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="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link href="styles.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'>
        <div id='buttongroup' class="e-btn-group">
            <button class='e-btn'>HTML</button>
            <button class='e-btn'>CSS</button>
            <button class='e-btn'>Javascript</button>
        </div>
    </div>
</body>

</html>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}
.e-btn-group {
  margin: 25px 5px 20px 20px;
}