jQuery UI Accordion activate Event

Last Updated : 30 May, 2022

jQuery UI consists of GUI widgets, visual effects, and themes implemented using HTML, CSS, and jQuery. jQuery UI is great for building UI interfaces for the webpages. The jQuery UI selectmenu widget can provide us with select options. We can use this widget to make a form for different actions.

The jQuery UI Accordion activate event is used to trigger after an accordion panel has been activated.

The Accordion activate event accepts two values that are listed below:

event: It represents the event for the slider widget.
ui: It is of an object type value. It contains four types of properties that are given below:
- newHeader: It represents the header that was just activated.
- oldHeader: It represents the header that was just deactivated.
- newPanel: It represents the panel that was just activated.
- oldPanel: It represents the panel that was just deactivated.

Syntax:

Initialize the accordion with the activate callback:

$( ".selector" ).accordion({
  activate: function( event, ui ) {}
});

Bind an event listener to the accordionactivate event:

$( ".selector" ).on( 
    "accordionactivate", 
    function( event, ui ) {} 
);

CDN Link: First, add jQuery UI scripts needed for your project.

<link rel=”stylesheet” href=”//code.jquery.com/ui/1.12.1/themes/smoothness/jquery-ui.css”>
<script src=”//code.jquery.com/jquery-1.12.4.js”></script>
<script src=”//code.jquery.com/ui/1.12.1/jquery-ui.js”></script>

Example: This example describes the uses of the jQuery UI Accordion activate event.

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>
        jQuery UI Accordion activate Event
    </title>
    <link rel="stylesheet" href=
"//code.jquery.com/ui/1.12.1/themes/smoothness/jquery-ui.css">
    <script src="//code.jquery.com/jquery-1.12.4.js">
    </script>
    <script src="//code.jquery.com/ui/1.12.1/jquery-ui.js">
    </script>
    <style>
        h1,
        h3 {
            text-align: center;
        }
        #GFG {
            width: 600px;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <h1 style="color: green;">
        GeeksforGeeks
    </h1>
    <h3>jQuery UI Accordion activate Event</h3>
    <div id="GFG">
        <h3>HTML</h3>
        <div>
            HTML stands for HyperText Markup Language.
            It is used to design web pages using the
            markup language. HTML is the combination
            of Hypertext and Markup language. Hypertext
            defines the link between the web pages and
            markup language defines the text document
            within the tag that define the structure
            of web pages.
        </div>
        <h3>CSS</h3>
        <div>
            CSS (Cascading Style Sheets) is a stylesheet
            language used to design a webpage to make it
            attractive. The reason for using this is to
            simplify the process of making web pages
            presentable. It allows you to apply styles
            on web pages. More importantly, it enables
            you to do this independent of the HTML that
            makes up each web page.
        </div>
        <h3>JavaScript</h3>
        <div>
            JavaScript is the world most popular
            lightweight, interpreted compiled programming
            language. It is also known as scripting
            language for web pages. It is well-known for
            the development of web pages, many non-browser
            environments also use it. JavaScript can be
            used for Client-side developments as well as
            Server-side developments.
        </div>
        <h3>Bootstrap</h3>
        <div>
            Bootstrap is a free and open-source tool
            collection for creating responsive websites
            and web applications. It is the most popular
            HTML, CSS, and JavaScript framework for
            developing responsive, mobile-first websites.
            Nowadays, the websites are perfect for all
            the browsers (IE, Firefox, and Chrome) and
            for all sizes of screens (Desktop, Tablets,
            Phablets, and Phones).
        </div>
    </div>
    <script>
        $(document).ready(function () {
            $("#GFG").accordion();
            $("#GFG").on("accordionactivate", function () {
                alert("Accordion Activate Event Triggered!");
            });
        });
    </script>
</body>
</html>