【发布时间】：2020-02-25 13:52:16
【问题描述】：
通过以下代码，我尝试结合拖放示例来限制特定区域的拖动并添加其他可拖动对象。最初的三个 'drag'-div 的行为与预期一样，不能被拖到 'container'-div 之外。另一方面，后来添加的“拖动”-div 则没有。
如何添加像前三个“拖动”-div 一样留在“容器”内的可拖动对象？
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=8" />
<link href="http://threedubmedia.com/inc/img/favicon.ico" rel="shortcut icon" />
<link href="http://threedubmedia.com/inc/css/base.css" rel="stylesheet" />
<script src="http://threedubmedia.com/inc/js/jquery-1.7.2.js"></script>
<script src="http://threedubmedia.com/inc/js/jquery.event.drag-2.2.js"></script>
<script src="http://threedubmedia.com/inc/js/jquery.event.drag.live-2.2.js"></script>
<script src="http://threedubmedia.com/inc/js/jquery.event.drop-2.2.js"></script>
<script src="http://threedubmedia.com/inc/js/jquery.event.drop.live-2.2.js"></script>
<script src="http://threedubmedia.com/inc/js/excanvas.min.js"></script>
<title>ThreeDubMedia · jquery.event.drag</title>
</head>
<body>
<script type="text/javascript">
jQuery(function($){
var num = 1;
var $div = $('#container');
$('.drag')
.drag("start",function( ev, dd ){
dd.limit = $div.offset();
dd.limit.bottom = dd.limit.top + $div.outerHeight() - $( this ).outerHeight();
dd.limit.right = dd.limit.left + $div.outerWidth() - $( this ).outerWidth();
})
.drag(function( ev, dd ){
$( this ).css({
top: Math.min( dd.limit.bottom, Math.max( dd.limit.top, dd.offsetY ) ),
left: Math.min( dd.limit.right, Math.max( dd.limit.left, dd.offsetX ) )
});
});
$('#add').click(function(){
$('<div class="drag"/>')
.text( num++ )
.appendTo( document.body )
.css({
top: Math.random() * 241 + $div.offset().top,
left: Math.random() * ( $( window ).width() - 100 ) + 20,
});
});
});
</script>
<h1>Live Drag Demo</h1>
<p>
<input type="button" id="add" value="Add a Box" />
to the screen, drag it around, thanks to "live" delegation.
</p>
<div id="container"></div>
<div class="drag" style="left:40px;"></div>
<div class="drag" style="left:120px;"></div>
<div class="drag" style="left:200px;"></div>
<style type="text/css">
.drag {
position: absolute;
border: 1px solid #89B;
background: #BCE;
height: 58px;
width: 58px;
cursor: move;
top: 120px;
text-align: center;
line-height: 58px;
}
#container {
height: 299px;
border: 1px dashed #888;
}
</style></body>
</html>
【问题讨论】：
标签： javascript jquery css