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网页特效代码:弹出一个淡入淡出的提示框
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昨天在得写“RSS收藏”栏目展现的时候我让RSS的列表用弹出的形式展现了，开始是直接的控制 style.display 来做的，但是感觉有点生硬，后来我利用javascript写了一个淡入淡出的效果，感觉在视觉上要比原来舒服多了，由此也总结出一段客户端的javascript脚本，只需传入一个元素的ID，就能对其实现淡入淡出的效果了，经测试，在IE6及firefox下都通过了，下面给大家分享一下儿吧。 其实“淡入淡出”的效果无非是需要通过定时的改变元素的透明度来实现的，但这个透明度的无素属性在IE和firefox下写法是不同的（不知道什么时候“标准”才能真正成为标准）。ie下要用“.filters.alpha.opacity”来指定透明度，而在firefox下却变成了“.style.opacity”了，并且在使用中我发现在ie环境下你可以直接用“obj.filters.alpha.opacity=obj.filters.alpha.opacity+10”这样子的写法来直接更改元素的透明度，而firefox下却不行，它会报脚本错误，只能去更改一个变量的值，然后再去赋值给“.style.opacity”属性才行，需要注意的也就这么多吧，下面我实现了两个大家经常会用到的效果：
一、手动去控制一个元素的出现与消失
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<SCRIPT>
var intTimeStep=20;
var isIe=(window.ActiveXObject)?true:false;
var intAlphaStep=(isIe)?5:0.05;
var curSObj=null;
var curOpacity=null;
function startObjVisible(objId)
{
curSObj=document.getElementById(objId);
setObjState();
}
function setObjState(evTarget)
{
if (curSObj.style.display==""){curOpacity=1;setObjClose();}
else{
if(isIe)
{
curSObj.style.cssText='DISPLAY: none;Z-INDEX: 1; FILTER: alpha(opacity=0); POSITION: absolute;';
curSObj.filters.alpha.opacity=0;
}else
{
curSObj.style.opacity=0
}
curSObj.style.display='';
curOpacity=0;
setObjOpen();
}
}
function setObjOpen()
{
if(isIe)
{
curSObj.filters.alpha.opacity+=intAlphaStep;
if (curSObj.filters.alpha.opacity<100) setTimeout('setObjOpen()',intTimeStep);
}else{
curOpacity+=intAlphaStep;
curSObj.style.opacity =curOpacity;
if (curOpacity<1) setTimeout('setObjOpen()',intTimeStep);
}
}
function setObjClose()
{
if(isIe)
{
curSObj.filters.alpha.opacity-=intAlphaStep;
if (curSObj.filters.alpha.opacity>0) {
setTimeout('setObjClose()',intTimeStep);}
else {curSObj.style.display="none";}
}else{
curOpacity-=intAlphaStep;
if (curOpacity>0) {
curSObj.style.opacity =curOpacity;
setTimeout('setObjClose()',intTimeStep);}
else {curSObj.style.display='none';}
}
}
</SCRIPT>
</head>
<body>
<table width=80%><tr><td>效果一：手动控制展现或消失<br><input type=button onclick="startObjVisible('objDiv');if(this.value=='点击展现'){this.value='点击隐藏'}else{this.value='点击展现'}" value="点击展现"></td>
</tr>
<tr><td><DIV id="objDiv" style="DISPLAY: none;">
<img src="http://www.chinaz.com/upimg/litimg/080522/013550264J3.gif">测试效果<img src="http://www.chinaz.com/upimg/litimg/080522/013550264J3.gif"></DIV></td></tr>
</table>
</body>
</html>
一、手动去控制一个元素的出现与消失
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<SCRIPT>
var intTimeStep=20;
var isIe=(window.ActiveXObject)?true:false;
var intAlphaStep=(isIe)?5:0.05;
var curSObj=null;
var curOpacity=null;
function startObjVisible(objId)
{
curSObj=document.getElementById(objId);
setObjState();
}
function setObjState(evTarget)
{
if (curSObj.style.display==""){curOpacity=1;setObjClose();}
else{
if(isIe)
{
curSObj.style.cssText='DISPLAY: none;Z-INDEX: 1; FILTER: alpha(opacity=0); POSITION: absolute;';
curSObj.filters.alpha.opacity=0;
}else
{
curSObj.style.opacity=0
}
curSObj.style.display='';
curOpacity=0;
setObjOpen();
}
}
function setObjOpen()
{
if(isIe)
{
curSObj.filters.alpha.opacity+=intAlphaStep;
if (curSObj.filters.alpha.opacity<100) setTimeout('setObjOpen()',intTimeStep);
}else{
curOpacity+=intAlphaStep;
curSObj.style.opacity =curOpacity;
if (curOpacity<1) setTimeout('setObjOpen()',intTimeStep);
}
}
function setObjClose()
{
if(isIe)
{
curSObj.filters.alpha.opacity-=intAlphaStep;
if (curSObj.filters.alpha.opacity>0) {
setTimeout('setObjClose()',intTimeStep);}
else {curSObj.style.display="none";}
}else{
curOpacity-=intAlphaStep;
if (curOpacity>0) {
curSObj.style.opacity =curOpacity;
setTimeout('setObjClose()',intTimeStep);}
else {curSObj.style.display='none';}
}
}
</SCRIPT>
</head>
<body>
<table width=80%><tr><td>效果一：手动控制展现或消失<br><input type=button onclick="startObjVisible('objDiv');if(this.value=='点击展现'){this.value='点击隐藏'}else{this.value='点击展现'}" value="点击展现"></td>
</tr>
<tr><td><DIV id="objDiv" style="DISPLAY: none;">
<img src="http://www.chinaz.com/upimg/litimg/080522/013550264J3.gif">测试效果<img src="http://www.chinaz.com/upimg/litimg/080522/013550264J3.gif"></DIV></td></tr>
</table>
</body>
</html>
#2楼发布者：sunhw0725时间：2008-05-22 14:00:51
二、弹出一个淡入淡出的提示框
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>特效代码:弹出一个淡入淡出的提示框</title>
<SCRIPT>
var intTimeStep=20;
var isIe=(window.ActiveXObject)?true:false;
var intAlphaStep=(isIe)?5:0.05;
var curSObj=null;
var curOpacity=null;
var stopTime=0;
function startObjMessage(objId)
{
curSObj=document.getElementById(objId);
if(isIe){curSObj.style.cssText='DISPLAY: none; Z-INDEX: 1; FILTER: alpha(opacity=0); POSITION: absolute;';}
setMessage();
}
function setMessage()
{
if(isIe){curSObj.filters.alpha.opacity=0;}
else{curOpacity=0;curSObj.style.opacity=0}
curSObj.style.display='';
setMessageShow();
}
function setMessageShow()
{
if(isIe)
{
curSObj.filters.alpha.opacity+=intAlphaStep;
if (curSObj.filters.alpha.opacity<100) {setTimeout('setMessageShow()',intTimeStep);}
else{stopTime+=10;if(stopTime<500){setTimeout('setMessageShow()',intTimeStep);}else{stopTime=0;setMessageClose();}}
}else
{
curOpacity+=intAlphaStep;
curSObj.style.opacity =curOpacity;
if (curOpacity<1) {setTimeout('setMessageShow()',intTimeStep);}
else{stopTime+=10;if(stopTime<200){setTimeout('setMessageShow()',intTimeStep);}else{stopTime=0;setMessageClose();}}
}
}
function setMessageClose()
{
if(isIe)
{
curSObj.filters.alpha.opacity-=intAlphaStep;
if (curSObj.filters.alpha.opacity>0) {
setTimeout('setMessageClose()',intTimeStep);
}
else {
curSObj.style.display='none';
}
}
else
{
curOpacity-=intAlphaStep;
if (curOpacity>0) {
curSObj.style.opacity =curOpacity;
setTimeout('setMessageClose()',intTimeStep);
}
else {
curSObj.style.display='none';
}
}
}
</SCRIPT>
</head>
<body>
<table width=80% ID="Table1"><tr><td>效果二：淡入淡出的弹出消息<br><input type=button onclick="startObjMessage('objDiv')" value="点击弹出消息" ID="Button1" NAME="Button1"></td>
</tr>
<tr><td><DIV id="objDiv" style="DISPLAY: none; Z-INDEX: 1; POSITION: absolute; ">
<img src="http://www.chinaz.com/upimg/litimg/080522/013550264J3.gif">测试效果<img src="http://www.chinaz.com/upimg/litimg/080522/013550264J3.gif"></DIV></td></tr>
</table>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>特效代码:弹出一个淡入淡出的提示框</title>
<SCRIPT>
var intTimeStep=20;
var isIe=(window.ActiveXObject)?true:false;
var intAlphaStep=(isIe)?5:0.05;
var curSObj=null;
var curOpacity=null;
var stopTime=0;
function startObjMessage(objId)
{
curSObj=document.getElementById(objId);
if(isIe){curSObj.style.cssText='DISPLAY: none; Z-INDEX: 1; FILTER: alpha(opacity=0); POSITION: absolute;';}
setMessage();
}
function setMessage()
{
if(isIe){curSObj.filters.alpha.opacity=0;}
else{curOpacity=0;curSObj.style.opacity=0}
curSObj.style.display='';
setMessageShow();
}
function setMessageShow()
{
if(isIe)
{
curSObj.filters.alpha.opacity+=intAlphaStep;
if (curSObj.filters.alpha.opacity<100) {setTimeout('setMessageShow()',intTimeStep);}
else{stopTime+=10;if(stopTime<500){setTimeout('setMessageShow()',intTimeStep);}else{stopTime=0;setMessageClose();}}
}else
{
curOpacity+=intAlphaStep;
curSObj.style.opacity =curOpacity;
if (curOpacity<1) {setTimeout('setMessageShow()',intTimeStep);}
else{stopTime+=10;if(stopTime<200){setTimeout('setMessageShow()',intTimeStep);}else{stopTime=0;setMessageClose();}}
}
}
function setMessageClose()
{
if(isIe)
{
curSObj.filters.alpha.opacity-=intAlphaStep;
if (curSObj.filters.alpha.opacity>0) {
setTimeout('setMessageClose()',intTimeStep);
}
else {
curSObj.style.display='none';
}
}
else
{
curOpacity-=intAlphaStep;
if (curOpacity>0) {
curSObj.style.opacity =curOpacity;
setTimeout('setMessageClose()',intTimeStep);
}
else {
curSObj.style.display='none';
}
}
}
</SCRIPT>
</head>
<body>
<table width=80% ID="Table1"><tr><td>效果二：淡入淡出的弹出消息<br><input type=button onclick="startObjMessage('objDiv')" value="点击弹出消息" ID="Button1" NAME="Button1"></td>
</tr>
<tr><td><DIV id="objDiv" style="DISPLAY: none; Z-INDEX: 1; POSITION: absolute; ">
<img src="http://www.chinaz.com/upimg/litimg/080522/013550264J3.gif">测试效果<img src="http://www.chinaz.com/upimg/litimg/080522/013550264J3.gif"></DIV></td></tr>
</table>
</body>
</html>