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ＪＡＶＡＳＣＲＩＰＴ 滚动字幕（支持添加多个)

摘要: ＪＡＶＡＳＣＲＩＰＴ 滚动字幕（支持添加多个)
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注: 在日文系统编写,所以用了我这乱七八糟的英文注释。Sorry!

JS文件:

//***********************************************************************************
// JavaScript HTML DIV scroll bar controler
//
// by mostone@hotmail.com 2005.06.15
//
// useage:
// create DIV scrollbar
// scroll directions: scroll up/ down/ left/ right
// setp 1:
// in HTML document, add a div tag and give "id" attribute
// setp 2:
// include this file into your HTML and etc document
// use "<script>" tag include src attribute
// setp 3:
// write your script
// exmple:
// var scrollBarControl = new scrollBar();
// scrollBarControl.addBar("myBarID", 100, 100, 50, "down");
// scrollBarcontrol.createScrollBars();
// finally:
// save your HTML document and test it.
//
//----------------------------------------------------------------------------------
// method:
// scrollBar()
// scrollBarControl class constrction
// without parameters
// addBar(barID, width, height, interval, direction)
// add user bar define
// parameters:
// barID (Required) String

the id tag
// width (Optional) Integer that specifies the bar's width
// height (Optional) Integer that specifies the bar's height
// interval (Optional) Integer that specifies the number of milliseconds.
// direction (Optional) String that specifies the scroll direction
//
//***********************************************************************************

var __scrollBarControl = null;

function innerBarProp(barID, width, height, interval, direction)
{
this.barID = barID;
this.width = width;
this.height = height;
this.interval = interval;
this.direction = direction;
this.stopScroll = false;
this.maxValue = 0;
this.preValue = 0;
}

function scrollBar()
{
this.barsArray = new Array();
//save current object
__scrollBarControl = this;
}

//////////////////////////////////////////////////////////////////
// add scrollbar to bar list and set properties
// parameters:
// barID: HTML's tag

's id property
// (for js access the DIV object)
// width: define the scrollbar's width
// height: define the scrollbar's height
// interval: define the scroll speed
// ( scroll up/down per XX millinSecond )
// direction: scroll direction's defined
// "up"
// "down"
// "left"
// "right"
//////////////////////////////////////////////////////////////////
scrollBar.prototype.addBar = function(barID, width, height, interval, direction)
{
//check parameters
var paraCount = arguments.length;
if ( paraCount < 1 )
{
alert("parameters count incorect!");
return;
//throw "parameters count inccorect!";
}

//width's default value
if ( typeof( width ) == "undefined" )
{
var width = 100;
}

//height's default value
if ( typeof( height ) == "undefined" )
{
var height = 100;
}

//interval's default value
if ( typeof( interval ) == "undefined" )
{
var interval = 1000;
}

//direction's default value
if ( typeof( direction ) == "undefined" )
{
var direction = "up";
}

//create scrollbar's inner properties
var barProp = new innerBarProp(barID, width, height, interval, direction);
var barCount = this.barsArray.length;
this.barsArray[barCount] = barProp;
}

scrollBar.prototype.createScrollBars = function()
{
//get bar's count
var barCount = this.barsArray.length;
//if no bar add to scrollControl do nothing
if ( barCount == 0 )
{
return;
}

//init scroll bars
for ( var i=0; i {
var objBarID = this.barsArray[i].barID;
//if typeof objBarID is object
// that's meaning it inited
//if typeof objBarID is string
// init that scroll bar
if ( typeof( objBarID ) == "string" )
{
//get scroll

object
var objBar = document.getElementById( objBarID );
if (objBar == null)
{
//objBarID is not exist
if ( document.readyState == "complete" || document.readyState == "loaded" )
{
//the objBarID not exists in current document
//throw "the objBarID is not exists.";
alert("ScrollBar[" + objBarID + "]: not exist!");
return;
}
else
{
//wait for document to load objBarID
window.setTimeout("__scrollBarControl.createScrollBars()",50);
//exit processing..........
//and wait next time callbak
return;
}
}

//update barID
this.barsArray[i].barID = objBar;
}
}

for ( var i=0; i {
this.innerInitBar(i);
}
}

scrollBar.prototype.innerInitBar = function (index)
{
//get properties
var barID = this.barsArray[index].barID;
var width = this.barsArray[index].width;
var height = this.barsArray[index].height;
var interval = this.barsArray[index].interval;
var direction = this.barsArray[index].direction;
var maxValue = 0;

//set scrollBar's properties
with(barID)
{
style.width = width;
style.height = height;
noWrap=true;

switch( direction )
{
case "up":
maxValue = Math.max(scrollHeight, height);
style.overflowX = "visible";
style.overflowY = "hidden";
var barHtml = innerHTML;
var newHtml = "<table border='0' cellspacing='0' cellpadding='0'>\n";
newHtml += " <tr>\n";
newHtml += " <td height='" + maxValue + "' valign='top'>\n";
newHtml += barHtml + "\n";
newHtml += " </td>\n";
newHtml += " </tr>\n";
newHtml += " <tr>\n";
newHtml += " <td height='" + maxValue + "' valign='top'>\n";
newHtml += barHtml + "\n";
newHtml += " </td>\n";
newHtml += " </tr>\n";
newHtml += "</table>\n";
innerHTML = newHtml;
break;
case "down":
maxValue = Math.max(scrollHeight, height);
style.overflowX = "visible";
style.overflowY = "hidden";
var barHtml = innerHTML;
var newHtml = "<table border='0' cellspacing='0' cellpadding='0'>\n";
newHtml += " <tr>\n";
newHtml += " <td height='" + maxValue + "' valign='top'>\n";
newHtml += barHtml + "\n";
newHtml += " </td>\n";
newHtml += " </tr>\n";
newHtml += " <tr>\n";
newHtml += " <td height='" + maxValue + "' valign='top'>\n";
newHtml += barHtml + "\n";
newHtml += " </td>\n";
newHtml += " </tr>\n";
newHtml += "</table>\n";
innerHTML = newHtml;
scrollTop = maxValue;
break;
case "left":
maxValue = Math.max(scrollWidth, width);
style.overflowX = "hidden";
style.overflowY = "visible";
var barHtml = barID.innerHTML;
var newHtml = "<table border='0' cellspacing='0' cellpadding='0' width='" + (maxValue * 2 ) + "'>\n";
newHtml += " <tr>\n";
newHtml += " <td width='" + maxValue + "' valign='top'>\n";
newHtml += barHtml + "\n";
newHtml += " </td>\n";
newHtml += " <td width='" + maxValue + "' valign='top'>\n";
newHtml += barHtml + "\n";
newHtml += " </td>\n";
newHtml += " </tr>\n";
newHtml += "</table>\n";
innerHTML = newHtml;
break;
case "right":
maxValue = Math.max(scrollWidth, width);
style.overflowX = "hidden";
style.overflowY = "visible";
var barHtml = innerHTML;
var newHtml = "<table border='0' cellspacing='0' cellpadding='0' width='" + (maxValue * 2 ) + "'>\n";
newHtml += " <tr>\n";
newHtml += " <td width='" + maxValue + "' valign='top'>\n";
newHtml += barHtml + "\n";
newHtml += " </td>\n";
newHtml += " <td width='" + maxValue + "' valign='top'>\n";
newHtml += barHtml + "\n";
newHtml += " </td>\n";
newHtml += " </tr>\n";
newHtml += "</table>\n";
innerHTML = newHtml;
scrollLeft = maxValue;
break;
default:
//throw "direction is inccorect!";
alert("ScrollBar[" + id + "]: direction is incorect!");
return;
}

//set mouse events
onmouseover = new Function("__scrollBarControl.mouseEvt(" + index + ",true);");
onmouseout = new Function("__scrollBarControl.mouseEvt(" + index + ",false);");
window.setInterval("__scrollBarControl.scroll(" + index + ");",interval);

//save maxValue
this.barsArray[index].maxValue = maxValue;
}
}

scrollBar.prototype.mouseEvt = function(index, stop)
{
this.barsArray[index].stopScroll = stop;
}

scrollBar.prototype.scroll = function(index)
{
//get properties
var barID = this.barsArray[index].barID;
var width = this.barsArray[index].width;
var height = this.barsArray[index].height;
var interval = this.barsArray[index].interval;
var direction = this.barsArray[index].direction;
var stopScroll = this.barsArray[index].stopScroll;
var preValue = this.barsArray[index].preValue;
var maxValue = this.barsArray[index].maxValue;

if ( stopScroll == true ) return;

switch(direction)
{
case "up":
preValue++;
if ( preValue >= maxValue )
{
preValue = 0;
}
barID.scrollTop = preValue;
break;
case "down":
preValue--;
if ( preValue <= 0 )
{
preValue = maxValue;
}
barID.scrollTop = preValue;
break;
case "left":
preValue++;
if ( preValue >= maxValue )
{
preValue = 0;
}
barID.scrollLeft = preValue;
break;
case "right":
preValue--;
if ( preValue <=0 )
{
preValue = maxValue;
}
barID.scrollLeft = preValue;
break;
}
this.barsArray[index].preValue = preValue;
}

//=================end of file===========================