链接提示文字的实现

领测软件测试网 在Web中经常碰到链接提示文字效果,就是当鼠标经过URL链接时,立刻弹出一个提示层(DIV),提示链接内容等等相关文字.虽然知道是用隐藏DIV实现的,不过一直不知道怎么弄.昨天搜到一个JS文件,可以轻松搞定.帖出来,收藏一下.
JS文件代码如下(mouse_on_title.js):

<!--
//***********默认设置定义.*********************
tPopWait=50; //停留tWait豪秒后显示提示。
tPopShow=6000; //显示tShow豪秒后关闭提示
showPopStep=20;
popOpacity=95;
fontcolor="#000000";
bgcolor="#EDEDED";
bordercolor="#007db5";

//***************内部变量定义*****************
sPop=null;curShow=null;tFadeOut=null;tFadeIn=null;tFadeWaiting=null;

document.write("<style type=‘’text/css‘’id=‘’defaultPopStyle‘’>");
document.write(".cPopText { background-color: " + bgcolor + ";color:" + fontcolor + "; border: 1px " + bordercolor + " solid;font-color: font-size: 12px; padding-right: 4px; padding-left: 4px; height: 20px; padding-top: 2px; padding-bottom: 2px; filter: Alpha(Opacity=0)}");
document.write("</style>");
document.write("<div id=‘’dypopLayer‘’ style=‘’position:absolute;z-index:1000;‘’ class=‘’cPopText‘’></div>");


function showPopupText(){
var o=event.srcElement;
MouseX=event.x;
MouseY=event.y;
if(o.alt!=null && o.alt!=""){o.dypop=o.alt;o.alt=""};
if(o.title!=null && o.title!=""){o.dypop=o.title;o.title=""};
if(o.dypop!=sPop) {
sPop=o.dypop;
clearTimeout(curShow);
clearTimeout(tFadeOut);
clearTimeout(tFadeIn);
clearTimeout(tFadeWaiting);
if(sPop==null || sPop=="") {
dypopLayer.innerHTML="";
dypopLayer.style.filter="Alpha()";
dypopLayer.filters.Alpha.opacity=0;
}
else {
if(o.dyclass!=null) popStyle=o.dyclass
else popStyle="cPopText";
curShow=setTimeout("showIt()",tPopWait);
}

}
}

function showIt(){
dypopLayer.className=popStyle;
dypopLayer.innerHTML=sPop;
popWidth=dypopLayer.clientWidth;
popHeight=dypopLayer.clientHeight;
if(MouseX+12+popWidth>document.body.clientWidth) popLeftAdjust=-popWidth-24
else popLeftAdjust=0;
if(MouseY+12+popHeight>document.body.clientHeight) popTopAdjust=-popHeight-24
else popTopAdjust=0;
dypopLayer.style.left=MouseX+12+document.body.scrollLeft+popLeftAdjust;
dypopLayer.style.top=MouseY+12+document.body.scrollTop+popTopAdjust;
dypopLayer.style.filter="Alpha(Opacity=0)";
fadeOut();
}

function fadeOut(){
if(dypopLayer.filters.Alpha.opacity<popOpacity) {
dypopLayer.filters.Alpha.opacity+=showPopStep;
tFadeOut=setTimeout("fadeOut()",1);
}
else {
dypopLayer.filters.Alpha.opacity=popOpacity;
tFadeWaiting=setTimeout("fadeIn()",tPopShow);
}
}

function fadeIn(){
if(dypopLayer.filters.Alpha.opacity>0) {
dypopLayer.filters.Alpha.opacity-=1;
tFadeIn=setTimeout("fadeIn()",1);
}
}
document.onmouseover=showPopupText;
-->

应用的时候,在页面的<head></head>之间加入:
<SCRIPT language=javascript src="mouse_on_title.js"></SCRIPT>

在需要提示层的链接中加入title属性,比如:
//<a href=”目标” title=”提示文字内容”>测试</a>
其实如果不加上述JS文件,提示层效果也是可以出来的.就是速度比较慢,提示层效果比较单调而已.

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