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Javascript code for automatic slide playback

Source: Internet
Author: User
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A good picture switching effect that can be used to discuss automatic playback with cache effect. You may want to know more about it.

The Code is as follows: Copy code

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> automatic playback-slide Buffer Effect </title>
<Style>
Body, div, ul, li {margin: 0; padding: 0 ;}
Ul {list-style-type: none ;}
Body {background: #000; text-align: center; font: 12px/20px Arial ;}
# Box {position: relative; width: pixel PX; height: 172px; background: # fff; border-radius: 5px; border: 8px solid # fff; margin: 10px auto; cursor: pointer ;}
# Box. list {position: relative; width: 490px; height: 170px; overflow: hidden ;}
# Box. list ul {position: absolute; top: 0; left: 0 ;}
# Box. list li {width: 490px; height: 170px; overflow: hidden ;}
# Box. count {position: absolute; right: 0; bottom: 5px ;}
# Box. count li {color: # fff; float: left; width: 20px; height: 20px; cursor: pointer; margin-right: 5px; overflow: hidden; background: # F90; opacity: 0.7; filter: alpha (opacity = 70); border-radius: 20px ;}
# Box. count li. current {color: # fff; opacity: 1; filter: alpha (opacity = 100); font-weight: 700; background: # f60 ;}
# Tmp {width: 100px; height: 100px; background: red; position: absolute ;}
</Style>
<Script type = "text/javascript">
Window. onload = function ()
{
Var oBox = document. getElementById ("box ");
Var oList = oBox. getElementsByTagName ("ul") [0];
Var aImg = oBox. getElementsByTagName ("img ");
Var timer = playTimer = null;
Var index = I = 0;
Var bOrder = true;
Var aTmp = [];
Var aBtn = null;
 
// Generate a number button
For (I = 0; I <aImg. length; I ++) aTmp. push ("<li>" + (I + 1) + "</li> ");
 
// Insert element
Var oCount = document. createElement ("ul ");
OCount. className = "count ";
OCount. innerHTML = aTmp. join ("");
OBox. appendChild (oCount );
ABtn = oBox. getElementsByTagName ("ul") [1]. getElementsByTagName ("li ");
 
// Initialization status
Cutover ();
 
// Click the button to switch
For (I = 0; I <aBtn. length; I ++)
{
ABtn [I]. index = I;
ABtn [I]. onmouseover = function ()
{
Index = this. index;
Cutover ()
}
}
 
Function cutover ()
{
For (I = 0; I <aBtn. length; I ++) aBtn [I]. className = "";
ABtn [index]. className = "current ";
StartMove (-(index * aImg [0]. offsetHeight ))
}
 
Function next ()
{
BOrder? Index ++: index --;
Index <= 0 & (index = 0, bOrder = true );
Index> = aBtn. length-1 & (index = aBtn. length-1, bOrder = false)
Cutover ()
}
 
PlayTimer = setInterval (next, 3000 );
 
// Move the cursor to the display area to stop automatic playback
OBox. onmouseover = function ()
{
ClearInterval (playTimer)
};
 
// Move the mouse away from the display area to start automatic playback
OBox. onmouseout = function ()
{
PlayTimer = setInterval (next, 3000)
};
Function startMove (iTarget)
{
ClearInterval (timer );
Timer = setInterval (function ()
{
DoMove (iTarget)
}, 30)
}
Function doMove (iTarget)
{
Var iSpeed = (iTarget-oList. offsetTop)/10;
ISpeed = iSpeed> 0? Math. ceil (iSpeed): Math. floor (iSpeed );
OList. offsetTop = iTarget? ClearInterval (timer): oList. style. top = oList. offsetTop + iSpeed + "px"
}
};
</Script>
</Head>
<Body>
<Div id = "box">
<Div class = "list">
<Ul>
<Li> </li>
<Li> </li>
<Li> </li>
<Li> </li>
<Li> </li>
</Ul>
</Div>
</Div>
</Body>

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