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Set custom animation

Accordion supports custom animations for both expand and collapse actions from the provided animation option of Animation library. The animation property also allows you to set easing, duration, and various other effects of your choice.

Default animation is given as SlideDown for expanding the panel using expand animation property and SlideUp for collapsing the panel using collapse animation property. You can also disable the animation by setting animation effect as none.

The sample demonstrates some types of animation that suits for Accordion. You can check all the animation effects here.

Source
Preview
index.js
index.html
ej.base.enableRipple(true);

//Initialize Accordion component

    var accordion = new ej.navigations.Accordion({
    items: [
        { header: 'ASP.NET', expanded: 'true', content: 'Microsoft ASP.NET is a set of technologies in the Microsoft .NET Framework for building Web applications and XML Web services.' },
        { header: 'ASP.NET MVC', content: 'The Model-View-Controller (MVC) architectural pattern separates an application into three main components: the model, the view, and the controller.' },
        { header: 'JavaScript', content: 'JavaScript (JS) is an interpreted computer programming language. It was originally implemented as part of web browsers so that client-side scripts could interact with the user, control the browser, communicate asynchronously, and alter the document content that was displayed.' },
    ]
    });

//Render initialized Accordion component
    accordion.appendTo('#element');

    var listObjExpand = new ej.dropdowns.DropDownList({ 
        index: 0,
        placeholder: 'Select a animate type',
        popupHeight: '150px',
        change: () => { valueChange();  }
     });
    listObjExpand.appendTo('#expandAnimation');
    valueChange();
    
    var listObjCollapse = new ej.dropdowns.DropDownList({ 
        index: 1,
        placeholder: 'Select a animate type',
        popupHeight: '150px',
        change: () => { valueChange1();  }
     });
    listObjCollapse.appendTo('#collapseAnimation');
    valueChange1();

    function valueChange() {
      accordion.animation.expand.effect = (listObjExpand.value);
    }
    function valueChange1() {
      accordion.animation.collapse.effect = (listObjCollapse.value);
    }
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 Accordion</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Toolbar Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/material.css" rel="stylesheet">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="default" style="padding-bottom:75px;">
            <div class="row">
                <div class="col-xs-6 col-sm-6 col-lg-6 col-md-6">
                    <label> Expand Animation </label>
                </div>
                <div class="col-xs-6 col-sm-6 col-lg-6 col-md-6">
                    <select id="expandAnimation"> 
    <option value="SlideDown">SlideDown</option>
    <option value="SlideUp">SlideUp</option>
    <option value="FadeIn">FadeIn</option>
    <option value="FadeOut">FadeOut</option>
    <option value="FadeZoomIn">FadeZoomIn</option>
    <option value="FadeZoomOut">FadeZoomOut</option>
    <option value="ZoomIn">ZoomIn</option>
    <option value="ZoomOut">ZoomOut</option>
    <option value="None">None</option>
            </select>
                </div>
            </div>
            <div class="row">
                <div class="col-xs-6 col-sm-6 col-lg-6 col-md-6">
                    <label> Collapse Animation </label>
                </div>
                <div class="col-xs-6 col-sm-6 col-lg-6 col-md-6">
                    <select id="collapseAnimation"> 
    <option value="SlideDown">SlideDown</option>
    <option value="SlideUp">SlideUp</option>
    <option value="FadeIn">FadeIn</option>
    <option value="FadeOut">FadeOut</option>
    <option value="FadeZoomIn">FadeZoomIn</option>
    <option value="FadeZoomOut">FadeZoomOut</option>
    <option value="ZoomIn">ZoomIn</option>
    <option value="ZoomOut">ZoomOut</option>
    <option value="None">None</option>
            </select>
                </div>
            </div>
        </div>
        <div id="element"></div>
        <br><br>
        <div id="result"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>