Javascript实现带阴影的提示框_层和布局特效

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当您的鼠标放到某段文字中有链接的文字上时，一个带阴影效果的提示框出现了，激动吧！本代码可以重用，请将JavaScript代码里的函数另存，用到的时候引入。

<!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" mrc="text/html; charset=gb2312" />
<title>Javascript实现带阴影的提示框 - www.mb5u.com </title>
	<style type="text/css">
	body{
		background-repeat:no-repeat;
		padding-top:85px;	
		font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;
		font-size:0.9em;
		line-height:130%;

}
	h1{
		line-height:130%;
	}
	a{
		color: #D60808;
		text-decoration:none;
		font-weight:bold;
	}
	a:hover{
		border-bottom:1px dotted #317082;
		color: #307082;
	}
   		
	#dhtmlgoodies_tooltip{
		background-color:#EEE;
		border:1px solid #000;
		position:absolute;
		display:none;
		z-index:20000;
		padding:2px;
		font-size:0.9em;
		-moz-border-radius:6px;	/* Rounded edges in Firefox */
		font-family: "Trebuchet MS", "Lucida Sans Unicode", Arial, sans-serif;
		
	}
	#dhtmlgoodies_tooltipShadow{
		position:absolute;
		background-color:#555;
		display:none;
		z-index:10000;
		opacity:0.7;
		filter:alpha(opacity=70);
		-khtml-opacity: 0.7;
		-moz-opacity: 0.7;
		-moz-border-radius:6px;	/* Rounded edges in Firefox */
	}
	</style>
<SCRIPT type="text/javascript">
	var dhtmlgoodies_tooltip = false;
	var dhtmlgoodies_tooltipShadow = false;
	var dhtmlgoodies_shadowSize = 4;
	var dhtmlgoodies_tooltipMaxWidth = 200;
	var dhtmlgoodies_tooltipMinWidth = 100;
	var dhtmlgoodies_iframe = false;
	var tooltip_is_msie = (navigator.userAgent.indexOf('MSIE')>=0 && navigator.userAgent.indexOf('opera')==-1 && document.all)?true:false;
	function showTooltip(e,tooltipTxt)
	{
		
		var bodyWidth = Math.max(document.body.clientWidth,document.documentElement.clientWidth) - 20;
	
		if(!dhtmlgoodies_tooltip){
			dhtmlgoodies_tooltip = document.createElement('DIV');
			dhtmlgoodies_tooltip.id = 'dhtmlgoodies_tooltip';
			dhtmlgoodies_tooltipShadow = document.createElement('DIV');
			dhtmlgoodies_tooltipShadow.id = 'dhtmlgoodies_tooltipShadow';
			document.body.appendChild(dhtmlgoodies_tooltip);
			document.body.appendChild(dhtmlgoodies_tooltipShadow);	
			if(tooltip_is_msie){
				dhtmlgoodies_iframe = document.createElement('IFRAME');
				dhtmlgoodies_iframe.frameborder='5';
				dhtmlgoodies_iframe.style.backgroundColor='#FFFFFF';
				dhtmlgoodies_iframe.src = '#'; 	
				dhtmlgoodies_iframe.style.zIndex = 100;
				dhtmlgoodies_iframe.style.position = 'absolute';
				document.body.appendChild(dhtmlgoodies_iframe);
			}
			
		}
		dhtmlgoodies_tooltip.style.display='block';
		dhtmlgoodies_tooltipShadow.style.display='block';
		if(tooltip_is_msie)dhtmlgoodies_iframe.style.display='block';
		
		var st = Math.max(document.body.scrollTop,document.documentElement.scrollTop);
		if(navigator.userAgent.toLowerCase().indexOf('safari')>=0)st=0; 
		var leftPos = e.clientX + 10;
		 dhtmlgoodies_tooltip.style.width = null;
		dhtmlgoodies_tooltip.innerHTML = tooltipTxt;
		dhtmlgoodies_tooltip.style.left = leftPos + 'px';
		dhtmlgoodies_tooltip.style.top = e.clientY + 10 + st + 'px';
		dhtmlgoodies_tooltipShadow.style.left =  leftPos + dhtmlgoodies_shadowSize + 'px';
		dhtmlgoodies_tooltipShadow.style.top = e.clientY + 10 + st + dhtmlgoodies_shadowSize + 'px';
		
		if(dhtmlgoodies_tooltip.offsetWidth>dhtmlgoodies_tooltipMaxWidth){
			dhtmlgoodies_tooltip.style.width = dhtmlgoodies_tooltipMaxWidth + 'px';
		}
		var tooltipWidth = dhtmlgoodies_tooltip.offsetWidth;		
		if(tooltipWidth<dhtmlgoodies_tooltipMinWidth)tooltipWidth = dhtmlgoodies_tooltipMinWidth;
		dhtmlgoodies_tooltip.style.width = tooltipWidth + 'px';
		dhtmlgoodies_tooltipShadow.style.width = dhtmlgoodies_tooltip.offsetWidth + 'px';
		dhtmlgoodies_tooltipShadow.style.height = dhtmlgoodies_tooltip.offsetHeight + 'px';		
		if((leftPos + tooltipWidth)>bodyWidth){
			dhtmlgoodies_tooltip.style.left = (dhtmlgoodies_tooltipShadow.style.left.replace('px','') - ((leftPos + tooltipWidth)-bodyWidth)) + 'px';
			dhtmlgoodies_tooltipShadow.style.left = (dhtmlgoodies_tooltipShadow.style.left.replace('px','') - ((leftPos + tooltipWidth)-bodyWidth) + dhtmlgoodies_shadowSize) + 'px';
		}
		if(tooltip_is_msie){
			dhtmlgoodies_iframe.style.left = dhtmlgoodies_tooltip.style.left;
			dhtmlgoodies_iframe.style.top = dhtmlgoodies_tooltip.style.top;
			dhtmlgoodies_iframe.style.width = dhtmlgoodies_tooltip.offsetWidth + 'px';
			dhtmlgoodies_iframe.style.height = dhtmlgoodies_tooltip.offsetHeight + 'px';
		}
				
	}
	
	function hideTooltip()
	{
		dhtmlgoodies_tooltip.style.display='none';
		dhtmlgoodies_tooltipShadow.style.display='none';		
		if(tooltip_is_msie)dhtmlgoodies_iframe.style.display='none';		
	}
	
	</SCRIPT>	
</head>
<body>
<h1>带阴影的提示框</h1>	
<P>想下载更多的高质量免费源码么？那么就请来到<a href="#" onmouseout="hideTooltip()" onmouseover="showTooltip(event,'模板无忧（Mb5u.com）提供编程源代码、常用软件、网页特效代码等资源的下载。');return false">模板无忧</a>者吧，每天都有你需要的学习资源，助您学习之路一路狂奔……
</P>
</body>
</html>

所属频道：层和布局特效/更新时间：2012-11-20

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