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实现简单的网页拖拽效果

2014-02-24 15:22 309 查看

<!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;
cursor:move;
position:absolute;
top:100px;
left:100px;
border:solid 1px #ccc;
}
h2{
color:red;
height:80px;
line-height:80px;
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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