bubbletooltips.js

展示数据结构的一些实用技巧. 包含: 1.运用kmp算法计算无穷概率 2.矩阵乘法的十种经典运算技巧 3.位运算的实用技巧(1) (2) (3)

/*javascript for Bubble Tooltips by Alessandro Fulciniti
- http://pro.html.it - http://web-graphics.com */

function enableTooltips(id){
var links,i,h;
if(!document.getElementById || !document.getElementsByTagName) return;
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="链接到：";
else t=String(t).replace(/\n/," ");
el.removeAttribute("title");
tooltip=CreateEl("span","tooltip");
s=CreateEl("span","top");
s.appendChild(document.createTextNode(t));
tooltip.appendChild(s);
b=CreateEl("b","bottom");
l=String(el.getAttribute("href"));
if(l.length>37) l=l.substr(0,35)+"..";
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);
Locate(e);
}

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:90)";
el.style.KHTMLOpacity="0.90";
el.style.MozOpacity="0.90";
el.style.opacity="0.90";
}

function CreateEl(t,c){
var x=document.createElement(t);
x.className=c;
x.style.display="block";
return(x);
}

function Locate(e){
var posx=0,posy=0;
if(e==null) e=window.event;
if(e.pageX || e.pageY){
	posx=e.pageX; posy=e.pageY;
	}
else if(e.clientX || e.clientY){
	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;
		}
	}
if (posx>750) posx=750;
document.getElementById("btc").style.top=(posy+20)+"px";
document.getElementById("btc").style.left=(posx-20)+"px";
}