Div Scroll Bar (用层模拟滚动条)

对Div的盒模型以及Css控制定位都不熟，所以遇到了不少BT问题……好在最终突破了种种困难，基本实现了自己想要的效果。

说明:

最大的突破是通过了 xhtml1-transitional.dtd 验证，可以在xhtml文档里正常使用.
采用相对定位，使用起来更灵活，可以放在页面任何地方而不用改程序.
结构规范，容易扩展.

代码:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title> Div Scroll Bar </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="Xiaosa">

//----------------------------------------
// Name:        Div Scroll Bar
// Author:      Xiaosa
// Contact:     goldenlove518@msn.com
// CreateDate: 2005-7-11
// LastChange: 2005-7-12
//----------------------------------------

var mouseInit = slideInit = 0;
var slider, xscroll, nContent,box;
var xH,xT,nSH,nOH;

function init(){
    box = document.getElementById("box");
    slider = document.getElementById("slider");
xscroll = document.getElementById("xscroll");
nContent = document.getElementById("nContent");

slider.style.left = xscroll.offsetLeft - xscroll.offsetWidth/2-1;
slider.style.top = xscroll.offsetTop;
slider.style.visibility = "visible";

xH = xscroll.offsetTop + xscroll.offsetHeight - slider.offsetHeight;
xT = xscroll.offsetTop;
nSH = nContent.scrollHeight;
nOH = nContent.offsetHeight;
    if(nSH <= nContent.clientHeight){
  xscroll.style.visibility = "hidden";
  slider.style.visibility = "hidden";
}
}

function xs_scroll(){
// Call Init function
init();

slider.onmousedown =function(){
   slider.setCapture();
   mouseInit = event.clientY;
   slideInit = parseInt(slider.style.marginTop);
   slider.οnmοusemοve= setPos;
}

slider.onmouseup = document.onmouseup = function(){
   slider.onmousemove = "";
   slider.releaseCapture();
}

box.ondragstart = box.onselectstart = function(){
   event.returnValue =false;
   return false;
}
}
    //Set slider Position
function setPos(){
var m = slideInit + (event.clientY - mouseInit);
if (m < 0) m = 0;
if (m > xscroll.clientHeight-slider.offsetHeight) m = xscroll.offsetHeight-slider.offsetHeight;

slider.style.marginTop = m + "px";
nContent.scrollTop = (nSH-nOH)*parseInt(m)/(xscroll.clientHeight-slider.clientHeight);
}

//Reset Box Layout
function window.onresize (){
box.style.left = "0px";
box.style.right = "0px";
}
//-->
</script>
<style>

/* ----------------------- Div Scroll Bar --------------------------------- */

#box {
     background:#fefefe;
     position:relative;
width:185px;
height:220px;
}
#xscroll {
     position:relative;
float:right;
left:auto;
top:auto;
height:100%;
width:1px;
background:red;
}
#slider {
     position:absolute;
left:0px;
top:0px;
z-index:1;
width:5px;
height:23px;
     visibility:hidden;
background:darkred;
}
#nContent {
color:#6A2A04;
     position:relative;
width:180px;
height:220px;
overflow:hidden;
background:#FF9933;
font-size:9pt;
font-family:arial;
}

</style>
</head>

<div id="box">
     <div id="xscroll"></div>
     <div id="slider" style="margin-top:0px;"> </div>
     <div id="nContent">
     <span style="font-weight:bold">
     We produce strategic events for a
     wide cross-section of industries
     with a particular emphasis on the
     following :</span><br /><br />
     * Telecommunications & IT <br />
     * Real Estate and Property Management
     * Financial Services<br />
     * Construction<br />
     * FMCG<br />
     * Aviation<br />
     * Pharmaceutical & Healthcare<br />
     * Oil & Gas, Power<br />
     * Auto <br />
     * Travel & Tourism<br />
     * Retail <br />
     * Advertising & Marketing<br />
     <br />
     <span style="font-weight:bold">All the products cover almost every job function of any organization :</span>
     <br /><br />
     * Marketing & Sales <br />
     * Research & Development <br />
     * Finance & Tax <br />
     * Manufacturing & Operations <br />
     * Legal Counsel <br />
     * Customer Services <br />
     * Human Resources <br />
     * Logistic & Supply Chain <br />
     * Public Relations <br />
     * IT <br />
     * Business Development & Strategic Planning
      </div>
    </div>
</body>
</html>

http://xs.org.cn/2005/xsblog/post/22.html

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