jQWidgets jqxTree focus()方法

jQWidgets是一个JavaScript框架，用于为PC和移动设备制作基于网络的应用程序。它是一个非常强大的、优化的、与平台无关的、并被广泛支持的框架。jqxTree代表一个jQuery widget，用来显示一个分层的项目集合。为了显示项目的集合，我们可以从 “UL “或使用其 “源 “属性来填充。

focus()方法是用来设置widget的焦点。它不接受任何参数，也不返回任何值。

语法:

$('Selector').jqxTree('focus');

链接的文件：从给定的链接中下载jQWidgets https://www.jqwidgets.com/download/。在HTML文件中，找到下载文件夹中的脚本文件。

<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>

下面的例子说明了jQWidgets jqxTree focus()方法。

示例:

<!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 focus() Method
    </h3>
  
    <div id='jqxTree'>
        <ul>
            <li item-selected='true'>
                GeeksforGeeks
            </li>
  
            <li id="prog">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="Focus on Widget" 
            style="padding: 5px 15px; margin-top: 20px;">
    </center>
      
    <script type="text/javascript">
         $(document).ready(function() {$ ('#jqxTree').jqxTree({
                width: '350px',
                height: '250px'
            });
        });
  
         $("#jqxBtn").on('click', function() {$ ('#jqxTree').jqxTree('focus');
            alert("Focus on Widget");
        });
    </script>
</body>
  
</html>

输出:

jQWidgets jqxTree focus()方法