定义和用法
通过定义 draggable 区域的边界来约束每个 draggable 的运动,使用 containment 选项来指定一个父级的 DOM 元素或者一
个 jQuery 选择器
示例
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>draggable</title>
<link rel="stylesheet" href="js/jquery-ui-1.12.1.custom/jquery-ui-1.12.1.custom/jquery-ui.min.css">
<style>
.draggable{
width: 90px;
height: 90px;
padding: 0.5em;
float: left;
margin: 0 10px 10px 0;
cursor: move
}
h3{
clear:left;
}
#containment-wrapper{
width:95%;
height: 450px;
border:2px solid #ccc;
padding:10px;
}
</style>
</head>
<body>
<h3>在DOM 元素中约束运动：</h3>
<div id="containment-wrapper">
<div id="draggable1" class="draggable ui-widget-content">
<p>我被约束在盒子里</p>
</div>
<div class="draggable ui-widget-content">
<p id="draggable2" class="ui-widget-header">我被约束在父元素内</p>
</div>
</div>
<script src="js/jquery-ui-1.12.1.custom/jquery-ui-1.12.1.custom/external/jquery/jquery.js" type="text/javascript" ></script>
<script src="js/jquery-ui-1.12.1.custom/jquery-ui-1.12.1.custom/jquery-ui.min.js"></script>
<script>
$("#draggable1").draggable({
containment:"#containment-wrapper",
scroll:false
});
$("#draggable2").draggable({containment:"parent"});
</script>
</body>
</html>
输出
