jQWidgets jqxTree ensureVisible()方法

jQWidgets jqxTree ensureVisible()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。

ensureVisible()方法是用来确保一个元素的可见性。它接受对象类型的单项参数,不返回任何值。

语法:

$('Selector').jqxTree('ensureVisible', item );

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 ensureVisible()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 ensureVisible() 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="Ensure Visible" 
            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 element =("#prog")[0];
            ('#jqxTree').jqxTree('ensureVisible', element);
            ('#jqxTree').jqxTree('selectItem', element);
        });
    </script>
</body>
  
</html>

输出:

jQWidgets jqxTree ensureVisible()方法

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