jQuery UI的Draggable containment选项

jQuery UI由GUI小工具、视觉效果和使用jQuery JavaScript库实现的主题组成。jQuery UI对于构建网页的UI界面非常有用。它可以用来建立高度互动的网络应用程序，也可以用来轻松地添加小工具。

在这篇文章中，我们将学习jQuery UI的Draggable containment选项。containment选项用于设置可拖动的项目将被包含在指定的容器中。

$(".drag").draggable({
    containment: "#gfg_container",
});

获得containment选项。

var containmentOpt = $(".drag")
        .draggable( "option", "containment");

设置遏containment选项。

$(".drag").draggable( "option", 
        "containment", "#gfg_container");

CDN链接：为jQuery UI项目使用以下CDNs。

<link rel=”stylesheet” href=”https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css” />
<script src=”https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js”></script>
<script src=”https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js”></script>

例子：在下面的例子中，项目被包含在容器内，其ID为 “gfg_container“。

<!DOCTYPE html>
<html lang="en">
  
<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" 
          content="IE=edge" />
    <meta name="viewport" 
          content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" 
          href=
"https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css" />
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js">
    </script>
    <style type="text/css">
    .drag {
        width: 50px;
        height: 50px;
        line-height: 50px;
        border: 1px solid black;
        cursor: pointer;
        border-radius: 10px;
        text-align: center;
        background-color: lightgreen;
    }
  
    .container {
        background-color: darkgreen;
        width: 200px;
        height: 200px;
        margin: auto;
    }
    </style>
</head>
  
<body>
    <div data-role="page" id="gfgpage">
        <h1 style="color: green;">
            GeeksforGeeks
        </h1>
        <div data-role="main" class="ui-content">
            <h3>jQuery UI Draggable containment option</h3>
            <div id="gfg_container" 
                 class="container">
                <div class="drag" 
                     style="left:20px;top:20px;">
                  Box 1
                </div>
                <div class="drag" 
                     style="left:20px;top:30px;
                            background-color:lightgray">
                  Box 2
               </div>
            </div>
        </div>
    </div>
    <script>
    $(".drag").draggable({
        containment: "#gfg_container",
        snap: true,
    });
    </script>
</body>
  
</html>

输出:

jQuery UI的Draggable containment选项