Google Suggest 基于JS的动态下拉菜单

From Google BloG

基本的原理是在当前窗口创建了一个iframe，然后将相关关键词的提示列表在iframe中，并通过列表点选将选定项放到搜索框中。

能这么快的能将所有相关关键词的检索数列出，看来所有的提示词已经提前进行了预搜索和数量记录。试了一下"sex"，没有相关检索提示，看来对搜索词进行了严格的色情过滤。

另外：这一动态列表功能也应用在GMail的地址栏自动输入完成中，如图：

Google自动完成的源代码如下：

代码：

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var pa=false;

var ta="";

var da=false;

var g="";

var G="";

var m="";

var j=-1;

var h=null;

var Z=-1;

var za=null;

var Ca=5;

var q="";

var Lb="div";

var Bb="span";

var la=null;

var a=null;

var b=null;

var Xa=null;

var mb=null;

var X=null;

var ha=null;

var ra=false;

var kc=null;

var hc=null;

var Ua=new Object();

var ca=1;

var Aa=1;

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var na=-1;

var Va=(new Date()).getTime();

var Q=false;

var k=null;

var sa=null;

var E=null;

var B=null;

var aa=null;

var Ba=false;

var Ka=false;

var p=60;

var ia=null;

var ya=null;

var W=0;

InstallAC=function(frm,fld,sb,pn,rl,hd,sm,ufn){

la=frm;

a=fld;

Xa=sb;

if(!pn)pn="search";

ia=pn;

var Kb="en|";

var Jb="zh-CN|zh-TW|ja|ko|vi|";

if(!rl||Kb.indexOf(rl+"|")==-1)rl="en";

ha=nb(rl);

if(Jb.indexOf(ha+"|")==-1){

X=true;

Y=false;

Ba=false}

else{

X=false;

if(ha.indexOf("zh")==0)Y=false;

else Y=true;

Ba=true}

if(!hd)hd=false;

ya=hd;

if(!sm)sm="query";

w=sm;

mb=ufn;

ac()}

;

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ra=true;

a.blur();

setTimeout("sfi();

",10);

return}

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if(document.createEventObject){

var y=document.createEventObject();

y.ctrlKey=true;

y.keyCode=70;

document.fireEvent("onkeydown",y)}

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var y=document.createEventObject();

y.ctrlKey=true;

y.keyCode=vb;

document.fireEvent("onkeydown",y)}

function gc(event){

}

function ic(event){

}

function Pb(event){

if(!event&&window.event)event=window.event;

if(event)na=event.keyCode;

if(event&&event.keyCode==8){

if(X&&(a.createTextRange&&(event.srcElement==a&&(bb(a)==0&&lb(a)==0)))){

cc(a);

event.cancelBubble=true;

event.returnValue=false;

return false}

}

function mc(){

}

function Db(){

if(w=="url"){

Ha()}

ba()}

function ba(){

if(b){

b.style.left=ob(a)+"px";

b.style.top=Qb(a)+a.offsetHeight-1+"px";

b.style.width=Ja()+"px"}

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if(navigator&&navigator.userAgent.toLowerCase().indexOf("msie")==-1){

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Q=false}

if(pa)E="complete";

else E="/complete/"+ia;

sa=E+"?hl="+ha;

if(!Q){

qa("qu","",0,E,null,null)}

la.onsubmit=Fa;

a.autocomplete="off";

a.onblur=Ob;

if(a.createTextRange)a.onkeyup=new Function("return okuh(event);

");

else a.onkeyup=okuh;

a.onsubmit=Fa;

g=a.value;

ta=g;

b=document.createElement("DIV");

b.id="completeDiv";

ca=1;

Aa=1;

b.style.borderRight="black "+ca+"px solid";

b.style.borderLeft="black "+ca+"px solid";

b.style.borderTop="black "+Aa+"px solid";

b.style.borderBottom="black "+Aa+"px solid";

b.style.zIndex="1";

b.style.paddingRight="0";

b.style.paddingLeft="0";

b.style.paddingTop="0";

b.style.paddingBottom="0";

ba();

b.style.visibility="hidden";

b.style.position="absolute";

b.style.backgroundColor="white";

document.body.appendChild(b);

Ma("",new Array(),new Array());

Gb(b);

var s=document.createElement("DIV");

s.style.visibility="hidden";

s.style.position="absolute";

s.style.left="-10000";

s.style.top="-10000";

s.style.width="0";

s.style.height="0";

var M=document.createElement("IFRAME");

M.completeDiv=b;

M.name="completionFrame";

M.id="completionFrame";

M.src=sa;

s.appendChild(M);

document.body.appendChild(s);

if(frames&&(frames["completionFrame"]&&frames["completionFrame"].frameElement))B=frames["completionFrame"].frameElement;

else B=document.getElementById("completionFrame");

if(w=="url"){

Ha();

ba()}

window.onresize=Db;

document.onkeydown=Pb;

Fb()}

function Ob(event){

if(!event&&window.event)event=window.event;

if(!ra){

F();

if(na==9){

Xb();

na=-1}

}

ra=false}

okuh=function(e){

m=e.keyCode;

aa=a.value;

Oa()}

;

function Xb(){

Xa.focus()}

sfi=function(){

a.focus()}

;

function Wb(va){

for(var f=0,oa="",zb="\n\r";

function Qa(i,dc){

var ga=i.getElementsByTagName(Bb);

if(ga){

for(var f=0;

function U(i){

if(!i)return null;

return Qa(i,"cAutoComplete")}

function wa(i){

if(!i)return null;

return Qa(i,"dAutoComplete")}

function F(){

document.getElementById("completeDiv").style.visibility="hidden"}

function cb(){

document.getElementById("completeDiv").style.visibility="visible";

ba()}

function Ma(is,cs,ds){

Ua[is]=new Array(cs,ds)}

sendRPCDone=function(fr,is,cs,ds,pr){

if(W>0)W--;

var lc=(new Date()).getTime();

if(!fr)fr=B;

Ma(is,cs,ds);

var b=fr.completeDiv;

b.completeStrings=cs;

b.displayStrings=ds;

b.prefixStrings=pr;

rb(b,b.completeStrings,b.displayStrings);

Pa(b,U);

if(Ca>0)b.height=16*Ca+4;

else F()}

;

function Oa(){

if(m==40||m==38)Yb();

var N=lb(a);

var v=bb(a);

var V=a.value;

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if(N>0&&v!=-1)V=V.substring(0,v);

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t.moveStart("character",d.value.length);

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}

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if(a.value!=V)S(V)}

}

g=V;

if(Eb(m)&&m!=0)Pa(b,U)}

function Fa(){

return xb(w)}

function xb(eb){

da=true;

if(!Q){

qa("qu","",0,E,null,null)}

F();

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var R="";

if(j!=-1&&h)R=U(h);

if(R=="")R=a.value;

if(q=="")document.title=R;

else document.title=q;

var Tb="window.frames['"+mb+"'].location = \""+R+'";

setTimeout(Tb,10);

return false}

else if(eb=="query"){

la.submit();

return true}

}

newwin=function(){

window.open(a.value);

F();

return false}

;

idkc=function(e){

if(Ba){

var Ta=a.value;

if(Ta!=aa){

m=0;

Oa()}

aa=Ta;

setTimeout("idkc()",10)}

}

;

setTimeout("idkc()",10);

function nb(La){

if(encodeURIComponent)return encodeURIComponent(La);

if(escape)return escape(La)}

function yb(Mb){

var H=100;

for(var o=1;

o<=(Mb-2)/2;

o++){

H=H*2}

H=H+50;

return H}

idfn=function(){

if(ta!=g){

if(!da){

var Za=nb(g);

var ma=Ua[g];

if(ma){

Va=-1;

sendRPCDone(B,g,ma[0],ma[1],B.completeDiv.prefixStrings)}

else{

W++;

Va=(new Date()).getTime();

if(Q){

fc(Za)}

else{

qa("qu",Za,null,E,null,null);

frames["completionFrame"].document.location.reload(true)}

}

a.focus()}

da=false}

ta=g;

setTimeout("idfn()",yb(W));

return true}

;

setTimeout("idfn()",10);

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S(U(this));

q=wa(this);

da=true;

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l(this,"bAutoComplete")}

;

var ec=function(){

l(this,"aAutoComplete")}

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g=G;

S(G);

q=G;

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cb();

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if(j!=-1&&C!=j){

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j=-1}

if(C<0){

j=-1;

a.focus();

return}

j=C;

h=za.item(C);

l(h,"bAutoComplete");

g=G;

q=wa(h);

S(U(h))}

function Eb(ja){

if(ja==40){

Na(j+1);

return false}

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Na(j-1);

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else if(ja==13||ja==3){

return false}

return true}

function Pa(K,ib){

var d=a;

var T=false;

j=-1;

var J=K.getElementsByTagName(Lb);

var O=J.length;

Z=O;

za=J;

Ca=O;

G=g;

if(g==""||O==0){

F()}

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cb()}

var Ab="";

if(g.length>0){

var f;

var o;

for(var f=0;

function ob(r){

return Ya(r,"offsetLeft")}

function Qb(r){

return Ya(r,"offsetTop")}

function Ya(r,ia){

var kb=0;

while(r){

kb+=r[ia];

r=r.offsetParent}

return kb}

function qa(name,value,Ra,hb,fb,Sb){

var Nb=name+"="+value+(Ra?";

expires="+Ra.toGMTString():"")+(hb?";

path="+hb:"")+(fb?";

domain="+fb:"")+(Sb?";

secure":"");

document.cookie=Nb}

function Ha(){

var xa=document.body.scrollWidth-220;

xa=0.73*xa;

a.size=Math.floor(xa/6.18)}

function lb(n){

var N=-1;

if(n.createTextRange){

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N=fa.text.length}

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N=n.selectionEnd-n.selectionStart}

return N}

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fa.moveEnd("textedit",1);

v=n.value.length-fa.text.length}

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v=-1}

return v}

function cc(d){

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t.moveStart("character",d.value.length);

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}

function jc(Zb,Ea){

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if(pa&&pa<=Ea){

var Ia=document.createElement("DIV");

Ia.innerHTML=Zb;

document.getElementById("console").appendChild(Ia)}

}

function l(c,name){

db();

c.className=name;

if(Ka){

return}

switch(name.charAt(0)){

case "m":c.style.fontSize="13px";

c.style.fontFamily="arial,sans-serif";

c.style.wordWrap="break-word";

break;

case "l":c.style.display="block";

c.style.paddingLeft="3";

c.style.paddingRight="3";

c.style.height="16px";

c.style.overflow="hidden";

break;

case "a":c.style.backgroundColor="white";

c.style.color="black";

if(c.displaySpan){

c.displaySpan.style.color="green"}

break;

case "b":c.style.backgroundColor="#3366cc";

c.style.color="white";

if(c.displaySpan){

c.displaySpan.style.color="white"}

break;

case "c":c.style.width=p+"%";

c.style.cssFloat="left";

break;

case "d":c.style.cssFloat="right";

c.style.width=100-p+"%";

if(w=="query"){

c.style.fontSize="10px";

c.style.textAlign="right";

c.style.color="green";

c.style.paddingTop="3px"}

else{

c.style.color="#696969"}

break}

}

function db(){

p=65;

if(w=="query"){

var wb=110;

var Sa=Ja();

var tb=(Sa-wb)/Sa*100;

p=tb}

else{

p=65}

if(ya){

p=99.99}

}

function Gb(i){

db();

var Ub="font-size: 13px;

font-family: arial,sans-serif;

word-wrap:break-word;

var Vb="display: block;

padding-left: 3;

padding-right: 3;

height: 16px;

overflow: hidden;

var bc="background-color: white;

var qb="background-color: #3366cc;

color: white ! important;

var ub="display: block;

margin-left: 0%;

width: "+p+"%;

float: left;

var Ga="display: block;

margin-left: "+p+"%;

if(w=="query"){

Ga+="font-size: 10px;

text-align: right;

color: green;

padding-top: 3px;

else{

Ga+="color: #696969;

D(".mAutoComplete",Ub);

D(".lAutoComplete",Vb);

D(".aAutoComplete *",bc);

D(".bAutoComplete *",qb);

D(".cAutoComplete",ub);

D(".dAutoComplete",Ga);

l(i,"mAutoComplete")}

function rb(i,cs,Hb){

while(i.childNodes.length>0)i.removeChild(i.childNodes[0]);

for(var f=0;

function D(name,gb){

if(Ka){

var I=document.styleSheets[0];

if(I.addRule){

I.addRule(name,gb)}

else if(I.insertRule){

I.insertRule(name+" {

"+gb+" }

",I.cssRules.length)}

}

function jb(){

var A=null;

try{

A=new ActiveXObject("Msxml2.XMLHTTP")}

catch(e){

try{

A=new ActiveXObject("Microsoft.XMLHTTP")}

catch(oc){

A=null}

}

if(!A&&typeof XMLHttpRequest!="undefined"){

A=new XMLHttpRequest()}

return A}

function fc(Rb){

if(k&&k.readyState!=0){

k.abort()}

k=jb();

if(k){

k.open("GET",sa+"&js=true&qu="+Rb,true);

k.onreadystatechange=function(){

if(k.readyState==4&&k.responseText){

var frameElement=B;

if(k.responseText.charAt(0)=="<"){

W--}

else{

eval(k.responseText)}

}

;

k.send(null)}

}

function S(Wa){

a.value=Wa;

aa=Wa}

源代码写的非常“拥挤”，我不得不用以下代码做了beautifier:

perl -pe 's/;/;\n/g' ac.js |perl -pe 's/}/}\n/g'|perl -pe 's/{/{\n/g' > ac.js.txt

附：

你尝试过把26个英文字母从A~Z输入，那么，排第一的将会是哪些单词呢：

a---amazon

b---best buy

c---cnn

d---dictionary

e---ebay

f---firefox

g---games

h---hotmail

i---ikea

j---jokes

k---kazaa

l---lyrics

m---mapquest

n---news

o---online dictionary

p---paris hilton

q---quotes

r---recipes

s---spybot

t---tara reid

u---ups

v---verizon

w---weather

x---xbox

y---yahoo

z---zip codes