<html>
<head>
<title>網頁特效|http://www.jscode.cn|---用圖片替代滾動條的方法</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
#scrollerContent {POSITION: absolute}
body {font-size:9pt;color:#660000;text-decoration: none}
</style>
<script>
var upH = 13;//向上的箭頭的高度
var upW = 9; //向上的箭頭的寬度
var downH = 13;//向下的箭頭的高度
var downW = 9;//向下的箭頭的寬度
var dragH = 26; //滾動條的高度
var dragW = 9; //滾動條的寬度
var scrollH =68; //滾動體的高度
var speed =9; //滾動的速度
var dom = document.getElementById ? true:false;
var nn4 = document.layers ? true:false;
var ie4 = document.all ? true:false;
var mouseY;
var mouseX;
var clickUp = false;
var clickDown = false;
var clickDrag = false;
var clickAbove = false;
var clickBelow = false;
var timer = setTimeout("",500);
var upL;
var upT;
var downL;
var downT;
var dragL;
var dragT;
var rulerL;
var rulerT;
var contentT;
var contentH;
var contentClipH;
var scrollLength;
var startY;
function down(e)
{
//單擊左健時處理
if((document.layers && e.which!=1) || (document.all && event.button!=1))
return true;
getMouse(e);
startY = (mouseY - dragT);
if(mouseX >= upL && (mouseX <= (upL + upW)) && mouseY >= upT && (mouseY <= (upT + upH))) //單擊向上的箭頭
{
clickUp = true;
return scrollUp();
}
else
if(mouseX >= downL && (mouseX <= (downL + downW)) && mouseY >= downT && (mouseY <= (downT + downH))) //單擊向下的箭頭
{
clickDown = true;
return scrollDown();
}
else
if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= dragT && (mouseY <= (dragT + dragH))) //滾動條內不做操作
{
clickDrag = true;
return false;
}
else
if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= rulerT && (mouseY <= (rulerT + scrollH))) //滾動體內
{
if(mouseY < dragT) //向上滾
{
clickAbove = true;
clickUp = true;
return scrollUp();
}
else //向下滾
{
clickBelow = true;
clickDown = true;
return scrollDown();
}
}
else
{
return true;
}
}
function move(e)
{
if(clickDrag && contentH > contentClipH) //有滾動條時執行
{
getMouse(e);
dragT = (mouseY - startY);
if(dragT < (rulerT))
dragT = rulerT;
if(dragT > (rulerT + scrollH - dragH))
dragT = (rulerT + scrollH - dragH);
contentT = ((dragT - rulerT)*(1/scrollLength));
contentT = eval('-' + contentT);
moveTo();
if(ie4)
return false;
}
}
//停止滾動
function up()
{
clearTimeout(timer);
clickUp = false;
clickDown = false;
clickDrag = false;
clickAbove = false;
clickBelow = false;
return true;
}
function getT()
{
if(ie4)
contentT = document.all.scrollerContent.style.pixelTop;
else
if(nn4)
contentT = document.scrollerContentClip.document.scrollerContent.top;
else
if(dom)
contentT = parseInt(document.getElementById("scrollerContent").style.top);
}
function getMouse(e)
{
if(ie4)
{
mouseY = event.clientY + document.body.scrollTop;
mouseX = event.clientX + document.body.scrollLeft;
}
else if(nn4 || dom)
{
mouseY = e.pageY;
mouseX = e.pageX;
}
}
//移動內容
function moveTo()
{
if(ie4)
{
document.all.scrollerContent.style.top = contentT;
document.all.ruler.style.top = dragT;
document.all.drag.style.top = dragT;
}
else
if(nn4)
{
document.scrollerContentClip.document.scrollerContent.top = contentT;
document.ruler.top = dragT;
document.drag.top = dragT;
}
else
if(dom)
{
document.getElementById("scrollerContent").style.top = contentT + "px";
document.getElementById("drag").style.top = dragT + "px";
document.getElementById("ruler").style.top = dragT + "px";
}
}
function scrollUp()
{
getT();
if(clickAbove)
{
if(dragT <= (mouseY-(dragH/2))) //移到指定的位置退出
return up();
}
if(clickUp)
{
if(contentT < 0)
{
dragT = dragT - (speed*scrollLength);
if(dragT < (rulerT))
dragT = rulerT;
contentT = contentT + speed;
if(contentT > 0)
contentT = 0;
moveTo(); //移動一個滾動距離
timer = setTimeout("scrollUp()",25);
}
}
return false;
}
function scrollDown()
{
getT();
if(clickBelow)
{
if(dragT >= (mouseY-(dragH/2)))
return up();
}
if(clickDown)
{
if(contentT > -(contentH - contentClipH))
{
dragT = dragT + (speed*scrollLength);
if(dragT > (rulerT + scrollH - dragH))
dragT = (rulerT + scrollH - dragH);
contentT = contentT - speed;
if(contentT < -(contentH - contentClipH))
contentT = -(contentH - contentClipH);
moveTo();
timer = setTimeout("scrollDown()",25);
}
}
return false;
}
function reloadPage()
{
location.reload();
}
function eventLoader()
{
if(ie4)
{
upL = document.all.up.style.pixelLeft;
upT = document.all.up.style.pixelTop;
downL = document.all.down.style.pixelLeft;
downT = document.all.down.style.pixelTop;
dragL = document.all.drag.style.pixelLeft;
dragT = document.all.drag.style.pixelTop;
rulerT = document.all.ruler.style.pixelTop;
contentH = parseInt(document.all.scrollerContent.scrollHeight);
contentClipH = parseInt(document.all.scrollerContentClip.style.height);
}
else
if(nn4)
{
upL = document.up.left;
upT = document.up.top;
downL = document.down.left;
downT = document.down.top;
dragL = document.drag.left;
dragT = document.drag.top;
rulerT = document.ruler.top;
contentH = document.scrollerContentClip.document.scrollerContent.clip.bottom;
contentClipH = document.scrollerContentClip.clip.bottom;
}
else
if(dom)
{
upL = parseInt(document.getElementById("up").style.left);
upT = parseInt(document.getElementById("up").style.top);
downL = parseInt(document.getElementById("down").style.left);
downT = parseInt(document.getElementById("down").style.top);
dragL = parseInt(document.getElementById("drag").style.left);
dragT = parseInt(document.getElementById("drag").style.top);
rulerT = parseInt(document.getElementById("ruler").style.top);
contentH = parseInt(document.getElementById("scrollerContent").offsetHeight);
contentClipH = parseInt(document.getElementById("scrollerContentClip").offsetHeight);
document.getElementById("scrollerContent").style.top = 0 + "px";
}
scrollLength = ((scrollH-dragH)/(contentH-contentClipH));
if(nn4)
{
document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP);
window.onresize = reloadPage;
}
document.onmousedown = down;
document.onmousemove = move;
document.onmouseup = up;
}
</script>
</head>
<body οnlοad="eventLoader()">
<span id="drag" style="left: 203px; position: absolute; top: 116px">
<img height="26" src="slider.gif" width="9" border="1">
</span>
<span id="ruler" style="top: 116px">
<img height="26" src="slider.gif" width="9" border="1">
</span>
<span id="up" style="left: 203px;position: absolute; top: 100px">
<img height="13" alt="" src="scrollup.gif" width="9" border="1">
</span>
<span id="down" style="left: 203px; position: absolute; top: 186px">
<img height="13" alt="" src="scrolldown.gif" width="9" border="1">
</span>
<span id="scrollerContentClip" style="left: 100; visibility: visible; overflow: hidden; width: 100; clip: rect(0px 140px 194px 0px);position: absolute; top: 100; height: 100; border: #CC6600 1px solid">
<span id="scrollerContent" style="width: 100; height: 100">
<p></p>
<p></p>
<p>呵呵呵呵</p>
<p>呵呵呵呵</p>
<p>呵呵</p>
<p>呵呵</p>
<p>呵呵呵呵</p>
<p>呵呵呵呵</p>
<p>呵呵呵</p>
<p>呵呵呵呵</p>
<p>呵呵</p>
</span>
</span>
</body>
</html>