//  描述        : 無間斷滾動(dòng)字幕
//  版本        : 2.0
//  作者        : 寶玉(WebUC.NET)
//  最新更新    : 2004-10-26
//  備            :

public:component>

public:attach event="oncontentready" onevent="f_Init()" />
public:attach event="onpropertychange" onevent="f_PropChange()" />
public:property name="direction" />
public:property name="speed" />
public:property name="delay" />

public:method NAME="marquee"/>
public:method NAME="stop"/>
public:method NAME="start"/>
/public:component>

script language="JScript">

var _oMarqueeContent;
var _oMarquee;
var _speed = 2;

var _orientation;
var _direction = "up"; 

var _ContentWidth;
var _ContentHeight;
var _MarqueeWidth;
var _MarqueeHeight;
var _paddingTop;

var _firstNode = 1;
var _count = 0;

var _timer = null;
var _pause = false;

var _marqueeInterval = 100;    // 滾動(dòng)間隔
var _delayInterval = 2000;    // 標(biāo)題顯示延遲間隔

//+----------------------------------------------------------------------------
//  Function:       f_Init
//  Description:    初始化
//    Parameters:        null
//  Returns:        null
//-----------------------------------------------------------------------------
function f_Init()
{

    _oMarquee = document.createElement("div");
    _oMarqueeContent = document.createElement("span");
    _oMarqueeContent.innerHTML = element.innerHTML;
    _oMarquee.appendChild(_oMarqueeContent);
    element.innerHTML = "";
    element.appendChild(_oMarquee);


    if(speed == null) speed = _speed;
    speed = parseInt(speed);
    if(!speed) speed =_speed;

    if(delay == null) delay = _delayInterval;
    delay = parseInt(delay);
    if(!delay) delay = _delayInterval;


    if(direction == null) direction =_direction;
    direction = direction.toLowerCase();
    if(direction != "left"  direction != "right"  direction != "up"  direction != "down")
        direction = _direction;

    _orientation= (direction == "left" || direction == "right") ? "horizontal" : "vertical"

    InitMarquee();

    marquee();
}

function InitMarquee()
{

    _MarqueeWidth = _oMarquee.offsetWidth;
    _MarqueeHeight = _oMarquee.offsetHeight;
    _count = _oMarqueeContent.children.length;

    _ContentWidth = _oMarqueeContent.offsetWidth;
    _ContentHeight = _oMarqueeContent.offsetHeight;    

    _paddingTop = _oMarquee.offsetTop;

    FillMarquee()

    _oMarqueeContent.style.position = "relative";
    _oMarqueeContent.style.pixelTop = 0;    

}

function FillMarquee()
{
    var children = _oMarqueeContent.children;
    var i = 0;

    if (_orientation== "horizontal")
    {
        while (_oMarqueeContent.offsetWidth  _ContentWidth + _MarqueeWidth)
        {
            _oMarqueeContent.appendChild(children[i++].cloneNode(true));
        }
    }
    else
    {
        while (_oMarqueeContent.offsetHeight  _ContentHeight + _MarqueeHeight)
        {
            _oMarqueeContent.appendChild(children[i++].cloneNode(true));
        }
    }
}

function marquee()
{
    if (_pause)
        return;

    switch(direction)
    {
        case "up":
            _oMarqueeContent.style.pixelTop -= speed;
            if(Math.abs(_oMarqueeContent.style.pixelTop + _ContentHeight + _paddingTop)  speed)
                _oMarqueeContent.style.pixelTop = 0;

            
            if (Math.abs(_oMarqueeContent.children[_firstNode].offsetTop) - _paddingTop  speed)
            {
                _firstNode++;
                if (_firstNode >= _count)
                    _firstNode = 0;

                _timer = window.setTimeout(uniqueID + ".marquee()", _delayInterval);
            }
            else
                _timer = window.setTimeout(uniqueID + ".marquee()", _marqueeInterval);
            break;
    }
}

function stop()
{
    clearTimer();
    _pause = true;
}

function start()
{
    if (_timer != null)
        clearTimer();

    _pause = false;

    marquee();

}

function clearTimer()
{
    window.clearTimeout(_timer);
    _timer = null;
}

//
// Cancels an event
//
function f_CancelEvent()
{
    event.returnValue = false;
}

//
// A property changed
//
function f_PropChange()
{
    switch (event.propertyName)
    {
        default:
            f_Redraw();
            break;
    }
}

//
// Forces a redraw of the control
//
function f_Redraw()
{

}

/script>

style>
body,td{
    font-size:9pt;
}

.marquee{
    overflow-y:hidden;word-break:break-all;padding:10px;
    behavior:url('marquee.htc');
}
.marquee div{
    padding-bottom:10px;
}
/style>
無間斷滾動(dòng)br />
每個(gè)標(biāo)題間有停留br />
鼠標(biāo)移入停止，鼠標(biāo)移出繼續(xù)滾動(dòng)br />

span style="height:100px;width:200px;border:1px solid black;" delay="3000" class="marquee" onmouseover="this.stop()" onmouseout="this.start()">
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/span>
script>

/script>