大段文字的滚动处理

- 中国WEB开发者网络 (http://www.webasp.net)
-- 网页特效 (http://www.webasp.net/javascript/)
--- 大段文字的滚动处理 (http://www.webasp.net/javascript/1/590.htm)
-- 发布日期： 2005-06-21
<!-- 网页特效代码由[中国WEB开发者网络:http://www.ChinaWebDev.com]提供！ -->
<!-- 要实现此效果需要 1 个步骤： -->

<!-- 第 1 步： -->
<!-- 把下面的代码加到<BODY></BODY>区域中： -->

<SCRIPT language=javascript>

var upH = 17;
var upW = 15;
var downH = 17;
var downW = 15;
var dragH = 27;
var dragW = 17;
var scrollH = 90;
var speed =15;




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){
if((document.layers && e.which!=1) || (document.all && event.button!=1)) return true; // Enables the right mousebutton
getMouse(e);
startY = (mouseY - dragT);


if(mouseX >= upL && (mouseX <= (upL + upW)) && mouseY >= upT && (mouseY <= (upT + upH))){
clickUp = true;
return scrollUp();
}

else if(mouseX >= downL && (mouseX <= (downL + downW)) && mouseY >= downT && (mouseY <= (downT + downH))){
clickDown = true;
return scrollDown();
}

else if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= dragT && (mouseY <= (dragT + dragH))){
clickDrag = true;
return false;
}
else if(mouseX >= dragL && (mouseX <= (dragL + dragW)) && mouseY >= rulerT && (mouseY <= (rulerT + scrollH))){

if(mouseY < dragT){
clickAbove = true;
clickUp = true;
return scrollUp();
}

else{
clickBelow = true;
clickDown = true;
return scrollDown();
}
}

else{
return true;
}
}


function move(e){
if(clickDrag && contentH > contentClipH){
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;
}

function up(){
clearTimeout(timer);

clickUp = false;
clickDown = false;
clickDrag = false;
clickAbove = false;
clickBelow = false;
return true;
}


function getT(){
if(ie4)
contentT = document.all.content.style.pixelTop;
else if(nn4)
contentT = document.contentClip.document.content.top;
else if(dom)
contentT = parseInt(document.getElementById("content").style.top);
}


function getMouse(e){
if(ie4){
mouseY = event.clientY;
mouseX = event.clientX;
}
else if(nn4 || dom){
mouseY = e.pageY;
mouseX = e.pageX;
}
}


function moveTo(){
if(ie4){
document.all.content.style.top = contentT;
document.all.ruler.style.top = dragT;
document.all.drag.style.top = dragT;
}
else if(nn4){
document.contentClip.document.content.top = contentT;
document.ruler.top = dragT;
document.drag.top = dragT;
}
else if(dom){
document.getElementById("content").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)))
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();
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 = document.all.content.offsetHeight;
contentClipH = document.all.contentClip.offsetHeight;
}
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.contentClip.document.content.clip.bottom;
contentClipH = document.contentClip.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 = document.getElementById("content").offsetHeight;
contentClipH = document.getElementById("contentClip").offsetHeight;
document.getElementById("content").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>

<STYLE type=text/css>#body {
HEIGHT: 100%; MARGIN: 0px; OVERFLOW: hidden; WIDTH: 100%
}
#content {
LEFT: 0px; POSITION: absolute; TOP: 0px; VISIBILITY: visible
}
A:hover {
FONT-SIZE: 9pt; TEXT-DECORATION: underline
}
A:link {
FONT-SIZE: 9pt; TEXT-DECORATION: none; 000000;: "宋体"
}
A:visited {
COLOR: #666666; FONT-FAMILY: "宋体"; FONT-SIZE: 9pt; TEXT-DECORATION: none
}
TD {
FONT-FAMILY: "宋体"; FONT-SIZE: 9pt
}
.90E {
COLOR: #000000; FONT-FAMILY: "arial"; FONT-SIZE: 9pt
}
.txtfield {
BACKGROUND-COLOR: #ccffcc; BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; BORDER-RIGHT: #000000 1px solid; BORDER-TOP: #000000 1px solid; FONT-FAMILY: "宋体"; FONT-SIZE: 9pt
}
#scroll {
HEIGHT: 351px; LEFT: 180px; POSITION: absolute; TOP: 1px; VISIBILITY: visible; WIDTH: 17px
}
</STYLE>
<BODY aLink=#616161 bgColor=#ebece0 link=#616161 onload=eventLoader();
text=#616161 topMargin=9 vLink=#616161 marginwidth="10" marginheight="9">
<DIV id=up
style="HEIGHT: 15px; LEFT: 161px; POSITION: absolute; TOP: 2px; VISIBILITY: visible; WIDTH: 17px; Z-INDEX: 1"><IMG
height=20 src="up.gif" width=13></DIV>
<DIV id=down
style="HEIGHT: 15px; LEFT: 161px; POSITION: absolute; TOP: 112px; VISIBILITY: visible; WIDTH: 17px; Z-INDEX: 2"><IMG
height=20 src="down.gif" width=13></DIV>
<DIV id=drag
style="HEIGHT: 27px; LEFT: 161px; POSITION: absolute; TOP: 23px; VISIBILITY: visible; WIDTH: 7px; Z-INDEX: 5"><IMG
height=25 src="scroller.gif" width=13></DIV>
<DIV id=ruler
style="HEIGHT: 27px; LEFT: 161px; POSITION: absolute; TOP: 23px; VISIBILITY: visible; WIDTH: 17px; Z-INDEX: 6"></DIV>
<DIV id=contentClip
style="CLIP: rect(0px 750px 345px 0px); HEIGHT: 133px; LEFT: 1px; OVERFLOW: hidden; POSITION: absolute; TOP: 0px; VISIBILITY: visible; WIDTH: 163px; Z-INDEX: 7">
<DIV id=content style="HEIGHT: 100px; LEFT: -9px; TOP: 1px; WIDTH: 170px">
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