本文介绍了一种使用JavaScript实现的鼠标滑过元素时显示提示信息的效果。通过修改HTML、CSS及JavaScript代码，可以在页面滚动时准确地展示出带有透明度及自定义样式的提示层。
把下面的代码保存为文件，再在目录下放一张名为200708171844190.gif图片就可以了，而且在面页滚动时可以准确显示
文件代码
<!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=gb2312" />
<title>鼠标滑过出现提示层效果 js代码 javascript</title>
<link href="style.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
function enableTooltips(id)
{
var links,i,h;
if(!document.getElementById || !document.getElementsByTagName)
return;
AddCss();
h=document.createElement("span");
h.id="btc";
h.setAttribute("id","btc");
h.style.position="absolute";
document.getElementsByTagName("body")[0].appendChild(h);
if(id==null)
links=document.getElementsByTagName("a");
else
links=document.getElementById(id).getElementsByTagName("a");
for(i=0;i<links.length;i++)
{
Prepare(links[i]);
}
}
function Prepare(el)
{
var tooltip,t,b,s,l;
t=el.getAttribute("title");
if(t==null || t.length==0)
t="link:";
el.removeAttribute("title");
tooltip=CreateEl("span","tooltip");
s=CreateEl("span","top");
s.appendChild(document.createTextNode(t));
tooltip.appendChild(s);
b=CreateEl("b","bottom");
l=el.getAttribute("href");
if(l.length>30)
l=l.substr(0,27)+"...";
b.appendChild(document.createTextNode(l));
tooltip.appendChild(b);
setOpacity(tooltip);
el.tooltip=tooltip;
el.onmouseover=showTooltip;
el.onmouseout=hideTooltip;
el.onmousemove=Locate;
}
function showTooltip(e)
{
document.getElementById("btc").appendChild(this.tooltip);
}
function hideTooltip(e)
{
var d=document.getElementById("btc");
if(d.childNodes.length>0)
d.removeChild(d.firstChild);
}
function setOpacity(el)
{
el.style.filter="alpha(opacity:95)";
el.style.KHTMLOpacity="0.95";
el.style.MozOpacity="0.95";
el.style.opacity="0.95";
}
function CreateEl(t,c)
{
var x=document.createElement(t);
x.className=c;
x.style.display="block";
return(x);
}
function AddCss()
{
var l=CreateEl("link");
l.setAttribute("type","text/css");
l.setAttribute("rel","stylesheet");
l.setAttribute("href","?.css");
l.setAttribute("media","screen");
document.getElementsByTagName("head")[0].appendChild(l);
}
function Locate(e)
{
if(document.all)
e=event;
var posx=0,posy=0;
if(e==null)
{
e=window.event;
posx=e.clientX;
posy=e.clientY;
}
else if(e.clientX || e.clientY)
{
var d=document.getElementById("btc").firstChild;
//alert(d.offsetTop);
if(document.documentElement.scrollTop)
{
posx=e.clientX+document.documentElement.scrollLeft;
posy=e.clientY+document.documentElement.scrollTop;
}
else
{
posx=e.clientX+document.body.scrollLeft;
posy=e.clientY+document.body.scrollTop;
}
}
document.getElementById("btc").style.top=(posy+2)+"px";
document.getElementById("btc").style.left=(posx-30)+"px";
}
</script>
<script type="text/javascript">
window.onload=function(){enableTooltips();};
</script>
</head>
<body style="text-align:center">
<a id="text" href="http://www.51flash.cn" title="this is the title" >51flash.cn</a>
</body>
</html>
样式文件
.tooltip
{
width: 200px; color:#000;
font:lighter 11px/1.3 Arial,sans-serif;
text-decoration:none;text-align:center
}
.tooltip span.top
{
padding: 30px 8px 0;
background: url(200708171844190.gif) no-repeat top
}
.tooltip b.bottom
{
padding:3px 8px 15px;color: #548912;
background: url(200708171844190.gif) no-repeat bottom
}
文件代码
<!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=gb2312" /><title>鼠标滑过出现提示层效果 js代码 javascript</title><link href="style.css" rel="stylesheet" type="text/css" /><script type="text/javascript">
function enableTooltips(id) {
var links,i,h; if(!document.getElementById || !document.getElementsByTagName) return; AddCss(); h=document.createElement("span"); h.id="btc"; h.setAttribute("id","btc"); h.style.position="absolute"; document.getElementsByTagName("body")[0].appendChild(h); if(id==null) links=document.getElementsByTagName("a"); else links=document.getElementById(id).getElementsByTagName("a"); for(i=0;i<links.length;i++) { Prepare(links[i]); } } function Prepare(el) { var tooltip,t,b,s,l; t=el.getAttribute("title"); if(t==null || t.length==0) t="link:"; el.removeAttribute("title"); tooltip=CreateEl("span","tooltip"); s=CreateEl("span","top"); s.appendChild(document.createTextNode(t)); tooltip.appendChild(s); b=CreateEl("b","bottom"); l=el.getAttribute("href"); if(l.length>30) l=l.substr(0,27)+"..."; b.appendChild(document.createTextNode(l)); tooltip.appendChild(b); setOpacity(tooltip); el.tooltip=tooltip; el.onmouseover=showTooltip; el.onmouseout=hideTooltip; el.onmousemove=Locate; } function showTooltip(e) { document.getElementById("btc").appendChild(this.tooltip); } function hideTooltip(e) { var d=document.getElementById("btc"); if(d.childNodes.length>0) d.removeChild(d.firstChild); } function setOpacity(el) { el.style.filter="alpha(opacity:95)"; el.style.KHTMLOpacity="0.95"; el.style.MozOpacity="0.95"; el.style.opacity="0.95"; } function CreateEl(t,c) { var x=document.createElement(t); x.className=c; x.style.display="block"; return(x); } function AddCss() { var l=CreateEl("link"); l.setAttribute("type","text/css"); l.setAttribute("rel","stylesheet"); l.setAttribute("href","?.css"); l.setAttribute("media","screen"); document.getElementsByTagName("head")[0].appendChild(l); } function Locate(e) { if(document.all) e=event; var posx=0,posy=0; if(e==null) { e=window.event; posx=e.clientX; posy=e.clientY; } else if(e.clientX || e.clientY) { var d=document.getElementById("btc").firstChild; //alert(d.offsetTop); if(document.documentElement.scrollTop) { posx=e.clientX+document.documentElement.scrollLeft; posy=e.clientY+document.documentElement.scrollTop; } else { posx=e.clientX+document.body.scrollLeft; posy=e.clientY+document.body.scrollTop; } } document.getElementById("btc").style.top=(posy+2)+"px"; document.getElementById("btc").style.left=(posx-30)+"px"; }</script><script type="text/javascript">window.onload=function(){enableTooltips();};</script></head><body style="text-align:center"> <a id="text" href="http://www.51flash.cn" title="this is the title" >51flash.cn</a></body></html>样式文件
.tooltip{ width: 200px; color:#000; font:lighter 11px/1.3 Arial,sans-serif; text-decoration:none;text-align:center}.tooltip span.top{ padding: 30px 8px 0; background: url(200708171844190.gif) no-repeat top } .tooltip b.bottom { padding:3px 8px 15px;color: #548912; background: url(200708171844190.gif) no-repeat bottom }
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