js可拖动的后台界面

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// ************************ 拖动 *********************************
function setDrag(e){
var drag_flag = true;
var begin_x = getX(e);
//添加蒙板
createMask();
//添加半透明拖动条
createSplitDiv();

function getX(e){
if(window.event) e = window.event;
return (e.x || e.clientX);
}

function createSplitDiv(){
//半透明的拖动条
var _top = $doc("topArea").offsetHeight +"px";
var _left = $doc("dragBar").offsetLeft +"px";;
var _height = $doc("dragBar").offsetHeight +"px";;

var splitDivCss="position:absolute;width:6px;height:"+_height+";top:"+_top+";left:"+_left+";cursor:col-
resize;background-color:#cccccc;overflow:hidden;z-index:10010;filter:alpha(opacity=50);opacity:0.5;";
var _splitDiv = document.createElement("div");
_splitDiv.id = "splitDiv";
_splitDiv.style.cssText = splitDivCss;

document.body.appendChild(_splitDiv);

}
function createMask(){
try{

//创建背景
var rootEl=document.documentElement||document.body;
var docHeight=((rootEl.clientHeight>rootEl.scrollHeight)?
rootEl.clientHeight:rootEl.scrollHeight)+"px";
var docWidth=((rootEl.clientWidth>rootEl.scrollWidth)?rootEl.clientWidth:rootEl.scrollWidth)
+"px";
var
shieldStyle="position:absolute;top:0px;left:0px;width:"+docWidth+";height:"+docHeight+";background:#cccccc;z-
index:10000;filter:alpha(opacity=0);opacity:0";
var _shield = document.createElement("div");
_shield.id = "shield";
_shield.style.cssText = shieldStyle;
document.body.appendChild(_shield);
}catch(e){}
}
//拖动时执行的函数
document.onmousemove = function(e){
try{
if(drag_flag){
var now_x = getX(e);
var _pv = parseInt($doc("splitDiv").style.left)+ now_x - begin_x;
$doc("splitDiv").style.left = _pv +"px";
begin_x = now_x;
}else{
$doc("leftShow").style.width = $doc("splitDiv").style.left;
document.body.removeChild($doc("shield"));
document.body.removeChild($doc("splitDiv"));
// 调整页面布局
resizePage();
}
}catch(e){}
}

document.onmouseup = function(){
try{
if(drag_flag){
//设定拖动条的位置（设定左侧的宽度）
$doc("leftShow").style.width = $doc("splitDiv").style.left;
document.body.removeChild($doc("shield"));
document.body.removeChild($doc("splitDiv"));
// 调整页面布局
resizePage();
}
drag_flag = false;
begin_x = null;
}catch(e){}
}

}

if(window.attachEvent){
window.attachEvent("onload",function(){resizePage();});
window.attachEvent("onresize",function(){resizePage();});
}
if(window.addEventListener){
window.addEventListener("load",function(){resizePage();},true);
window.addEventListener("resize",function(){resizePage();},true);
}

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