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jQWidgets jqxTree addBefore() Method

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  • Last Updated : 08 Oct, 2021
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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 addBefore() method is used to add an item as a sibling of another item. It accepts two parameters, the first one is item of object type and the second one is id of the item. It does not return any value.

Syntax:

$('Selector').jqxTree('addBefore', newElement, element);

Linked Files: Download jQWidgets from the given link https://www.jqwidgets.com/download/. 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 addBefore() method.

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 addBefore() Method
    </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>
  
    <center>
        <input type="button" id="jqxBtn" 
            value="Add Item" 
            style="padding: 5px 15px; margin-top: 20px;">
    </center>
      
    <script type="text/javascript">
        $(document).ready(function() {
            $('#jqxTree').jqxTree({
                width: '350px',
                height: '250px'
            });
        });
  
        $("#jqxBtn").on('click', function() {
            var Items = $("#jqxTree").jqxTree('getItems');
            var first_Item = Items[0];
            var first_Item_Element = first_Item.element;
            $('#jqxTree').jqxTree('addBefore', {
                label: 'New GeeksforGeeks'
            }, first_Item_Element);
        });
    </script>
</body>
  
</html>


Output:

Reference: https://www.jqwidgets.com/jquery-widgets-documentation/documentation/jqxtree/jquery-tree-api.htm


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