jQWidgets jqxTree expand Event

Last Updated : 07 Oct, 2021

jQWidgets is a JavaScript framework for making web-based applications for pc and mobile devices. It is a very powerful, optimized, platform-independent, and widely supported framework. The jqxTree represents a jQuery widget that is used to display a hierarchical collection of items. To display the collection of items, we can populate from ‘UL’ or by using its ‘source’ property.

The expand event is used to triggered when the user expands a tree item.

Syntax:

$('Selector').on('expand', function (event) {  });

Linked Files: Download jQWidgets from the given link. In the HTML file, locate the script files in the downloaded folder.

<link rel=”stylesheet” href=”jqwidgets/styles/jqx.base.css” type=”text/css” />
<script type=”text/javascript” src=”scripts/jquery-1.11.1.min.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxcore.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqx-all.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxbuttons.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxscrollbar.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxpanel.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxtree.js”></script>

The below example illustrates the jQWidgets jqxTree expand event.

Example:

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <link rel="stylesheet" href= 
        "jqwidgets/styles/jqx.base.css" type="text/css" /> 
    <script type="text/javascript" 
        src="scripts/jquery-1.11.1.min.js"></script> 
    <script type="text/javascript" 
        src="jqwidgets/jqxcore.js"></script> 
    <script type="text/javascript" 
        src="jqwidgets/jqx-all.js"></script> 
    <script type="text/javascript" 
        src="jqwidgets/jqxbuttons.js"></script> 
    <script type="text/javascript" 
        src="jqwidgets/jqxscrollbar.js"></script> 
    <script type="text/javascript" 
        src="jqwidgets/jqxpanel.js"></script> 
    <script type="text/javascript" 
        src="jqwidgets/jqxtree.js"></script> 
  
    <style> 
        h1, 
        h3 { 
            text-align: center; 
        } 
          
        #jqxTree { 
            width: 100%; 
            margin: 0 auto; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color: green;"> 
        GeeksforGeeks 
    </h1> 
  
    <h3> 
        jQWidgets jqxTree expand Event 
    </h3> 
  
    <div id='jqxTree'> 
        <ul> 
            <li item-selected='true'> 
                GeeksforGeeks 
            </li> 
              
            <li>Programming 
                <ul> 
                    <li>C</li> 
                    <li>C++</li> 
                    <li>Java</li> 
                    <li>Python</li> 
                </ul> 
            </li> 
              
            <li>Web Technology 
                <ul> 
                    <li>HTML</li> 
                    <li>CSS</li> 
                    <li>JavaScript</li> 
                    <li>jQuery</li> 
                    <li>PHP</li> 
                </ul> 
            </li> 
        </ul> 
    </div> 
  
    <script type="text/javascript"> 
        $(document).ready(function() { 
            $('#jqxTree').jqxTree({ 
                width: '350px', 
                height: '250px', 
                allowDrag: true, 
                allowDrop: true 
            }); 
        }); 
  
        $('#jqxTree').on('expand', function (event) {  
            alert("Tree Items Expanded"); 
        }); 
    </script> 
</body> 
  
</html>