Summary of 4 methods to make div floating layer, scroll bar move and position remain unchanged

Author：Eve Cole Update Time：2025-03-03 19:48:02

The div remains at the top and the scroll bar scrolls, but the div is still at the top! Upload the source code directly:

Method one:

Copy the code code as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">

<head>

<title>div floating layer, scroll bar moves, keeping position unchanged</title>

body{background-image:url(about:blank);background-attachment:fixed;}

#float{width:344px;height:34px;border:1px solid #C0DBF8;position:absolute;top:0px;}

</style>

</head>

<body>

</body>

var IO=document.getElementById('float'),Y=IO,H=0,IE6;

IE6=window.ActiveXObject&&!window.XMLHttpRequest;

while(Y){H+=Y.offsetTop;Y=Y.offsetParent};

if(IE6)

IO.style.cssText="position:absolute;top:(this.fix?(document.documentElement.scrollTop-(this.javascript||"+H+")):0)";

window.onscroll=function (){

var d=document,s=Math.max(d.documentElement.scrollTop,document.body.scrollTop);

if(s>H&&IO.fix||s<=H&&!IO.fix)return;

if(!IE6)IO.style.position=IO.fix?"":"fixed";

IO.fix=!IO.fix;

};

try{document.execCommand("BackgroundImageCache",false,true)}catch(e){};

</script>

</html>

Method two:

Copy the code code as follows:

<div>

</div>

Centered layer

</body></STRONG>

Method three:

Copy the code code as follows:

Centered layer

</div>

</body>

Method 4: [Use css to center]

Copy the code code as follows:

<!--

html,body {height:100%; margin:0px; font-size:12px;}

.mydiv {

background-color: #f9fff6;

border: 1px solid #009900;

text-align: center;

line-height: 25px;

font-size: 13px;

font-weight: bold;

z-index:99;

width: 300px;

height: 50px;

left:50%;/*FF IE7*/

top:50%;/*FF IE7*/

margin-left:-150px!important;/*FF IE7 half of its width */

margin-top:-60px!important;/*FF IE7 half of its height*/

margin-top:0px;

position:fixed!important;/*FF IE7*/

position:absolute;/*IE6*/

_top: expression(eval(document.compatMode &&

document.compatMode=='CSS1Compat') ?

documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/

document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/

}

-->

</style>

function showDiv(){

document.getElementById('popDiv').style.display='block';

}

window.onload=function(){

showDiv();

}

</script>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>Always in the middle DIV (supports IE FF)</title>

</head>

<body>

<div id="popDiv" style="display:none;">Always in the middle<br/>

</div>

</body>

</html>