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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>自写的拖动类……</title>
<script type="text/javascript">
var d=document;//给document对象一个通用的事件侦听方法
d.addListener=function(e,f,b){
this.attachEvent?this.attachEvent('on'+e,f):this.addEventListener(e,f,b);
}
d.removeListener=function(e,f,b){
this.detachEvent?this.detachEvent('on'+e,f):this.removeEventListener(e,f,b);
}
function $(){//接收一个id参数，返回带有startDrag方法的对象
var o=document.getElementById(arguments[0]);
o.addListener=function(e,f,b){
this.attachEvent?this.attachEvent('on'+e,f):this.addEventListener(e,f,b);
}
o.removeListener=function(e,f,b){
this.detachEvent?this.detachEvent('on'+e,f):this.removeEventListener(e,f,b);
}
o.startDrag=function(obj){//参数obj默认为o本身，可以传其它参数以确定要移动的对象
var obj=obj?obj:o;
var sx,sy;
o.style.cursor="move";
o.addListener("mousedown",function(e){
e||event;
if(e.button==1||e.button==0){
sx=e.clientX-obj.offsetLeft;sy=e.clientY-obj.offsetTop;
d.addListener("mousemove",move,false);
d.addListener("mouseup",stopDrag,false);
}
},false);
var stopDrag=function(){
d.removeListener("mousemove",move,false);
d.removeListener("mouseup",stopDrag,false);
}
var move=function(e){
e||event;
window.getSelection ? window.getSelection().removeAllRanges() :
document.selection.empty();
if(e.preventDefault)e.preventDefault();//这两句便是解决firefox拖动问题的.
with (obj.style){
position="absolute"
left=e.clientX-sx+"px";
top=e.clientY-sy+"px";
}
}
}
return o;
}
window.onload=function(){$("ok").startDrag($("os"))}//本例中拖动ok元素，移动其父元素
</script>
<style type="text/css">
*{margin:0;padding:0}
#ok{width:192px;height:108px;background:url(/effects/UploadFiles_7074/201008/2010082709031535.gif)}
#os{width:400px;height:300px;background:#09f;left:300px}
#os2{width:400px;height:300px;background:#f90;}
</style>
</head>
<body>
<div id="os"><p id="ok"></p></div>
<div id="os2"></div>
</body>
</html> |
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