jQuery UI Selectmenu open Event

Last Updated : 25 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 Selectmenu open event is used to trigger when the selectmenu item is opened. This event will fire every time when we open the selectmenu.

The Selectmenu open event accepts one value that is given below:

event: It represents the event for the slider widget.

Note: The ui object is empty but it is added for consistency with other events.

Syntax:

Initialize the selectmenu with the open callback:

$( ".selector" ).selectmenu({
      open: function( event, ui ) {}
});

Bind an event listener to the selectmenuopen event:

$( ".selector" ).on( 
    "selectmenuopen", 
    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 Selectmenu open event.

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="utf-8" /> 
    <title> 
        jQuery UI Selectmenu open 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> 
</head> 
  
<body> 
    <center> 
        <h1 style="color: green;"> 
            GeeksforGeeks 
        </h1> 
  
        <h3>jQuery UI Selectmenu open Event</h3> 
  
        <label for="sub">Select Computer Subject:</label> 
  
        <select name="sub" id="sub"> 
            <option value="html">HTML</option> 
            <option value="css">CSS</option> 
            <option value="js">JavaScript</option> 
            <option value="java">Java</option> 
            <option value="python">Python</option> 
        </select> 
    </center> 
  
    <script> 
        $(document).ready(function () { 
            $("#sub").selectmenu(); 
  
            $("#sub").on("selectmenuopen", function () { 
                alert("Selectmenu open event triggered!"); 
            }); 
        }); 
    </script> 
</body> 
  
</html>