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创建鼠标可以拖动的DIV

2012-09-10 11:30 531 查看

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>自由拖动的DIV层方块</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312" />
<style type="text/css">
#draggable
{
background-color: green;
font-size: 9pt;
padding: 30px;
color: white;
width: 360px;
height: 324px;
position: absolute;
}
</style>

<script type="text/javascript">
var rDrag = {

o: null,

init: function(o) {
o.onmousedown = this.start;
},
start: function(e) {
var o;
e = rDrag.fixEvent(e);
//取消浏览器的默认行为
e.preventDefault && e.preventDefault();
rDrag.o = o = this;
o.x = e.clientX - rDrag.o.offsetLeft;
o.y = e.clientY - rDrag.o.offsetTop;
document.onmousemove = rDrag.move;
document.onmouseup = rDrag.end;
},
move: function(e) {
e = rDrag.fixEvent(e);
var oLeft, oTop;
oLeft = e.clientX - rDrag.o.x;
oTop = e.clientY - rDrag.o.y;
rDrag.o.style.left = oLeft + 'px';
rDrag.o.style.top = oTop + 'px';
},
end: function(e) {
e = rDrag.fixEvent(e);
rDrag.o = document.onmousemove = document.onmouseup = null;
},
fixEvent: function(e) {
if (!e) {
e = window.event;
e.target = e.srcElement;
//FF的layer是相对于元素的左上角
e.layerX = e.offsetX;
e.layerY = e.offsetY;
}
return e;
}
}
window.onload = function() {
var obj = document.getElementById('draggable');
rDrag.init(obj);
}
</script>

</head>
<body>
<div id="draggable">
这个可以拖动！
<div style="background-color: blue; height: 300px;">

</div>
</div>
</body>
</html>

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