jquery简单的拖动效果实现原理及示例
jquery简单的拖动效果实现原理及示例
发布时间:2016-12-30 来源:查字典编辑
摘要:复制代码代码如下:简单拖曵原理实例#drag{width:400px;height:300px;background:url(http://...

复制代码 代码如下:

<!DOCTYPE html>

<html>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>简单拖曵原理实例</title>

<style type="text/css">

#drag{width:400px;height:300px;background:url(http://upload.yxgz.cn/uploadfile/2009/0513/20090513052611873.jpg);cursor:move;position:absolute;top:100px;left:100px;border:solid 1px #ccc;}

h2{color:#fff;background: none repeat scroll 0 0 rgba(16, 90, 31, 0.7);color:#FFFFFF;height:40px;line-height:40px;margin:0;}

</style>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>

<script type="text/javascript">

$(function(){

/*--------------拖曳效果----------------

*原理:标记拖曳状态dragging ,坐标位置iX, iY

* mousedown:fn(){dragging = true, 记录起始坐标位置,设置鼠标捕获}

* mouseover:fn(){判断如果dragging = true, 则当前坐标位置 - 记录起始坐标位置,绝对定位的元素获得差值}

* mouseup:fn(){dragging = false, 释放鼠标捕获,防止冒泡}

*/

var dragging = false;

var iX, iY;

$("#drag").mousedown(function(e) {

dragging = true;

iX = e.clientX - this.offsetLeft;

iY = e.clientY - this.offsetTop;

this.setCapture && this.setCapture();

return false;

});

document.onmousemove = function(e) {

if (dragging) {

var e = e || window.event;

var oX = e.clientX - iX;

var oY = e.clientY - iY;

$("#drag").css({"left":oX + "px", "top":oY + "px"});

return false;

}

};

$(document).mouseup(function(e) {

dragging = false;

$("#drag")[0].releaseCapture();

e.cancelBubble = true;

})

})

</script>

</head>

<body>

<div id="drag">

<h2>来拖动我啊</h2>

</div>

</body>

</html>

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