Google Suggest /基于js的动态下拉菜单

时间：2023-01-16 11:08:22

基本的原理是在当前窗口创建Google Suggest /基于js的动态下拉菜单了一个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 Suggest /基于js的动态下拉菜单

Google自动完成的源代码如下： 
// Copyright 2004 and onwards Google Inc.

var w="";
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;
var Y=false;
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()}

;
function Yb(){
ra=true;
a.blur();
setTimeout("sfi();
",10);
return}

function Fb(){
if(document.createEventObject){
var y=document.createEventObject();
y.ctrlKey=true;
y.keyCode=70;
document.fireEvent("onkeydown",y)}
}

function nc(vb){
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"}
}

function Ja(){
if(navigator&&navigator.userAgent.toLowerCase().indexOf("msie")==-1){
return a.offsetWidth-ca*2}
else{
return a.offsetWidth}
}

function ac(){
if(jb()){
Q=true}
else{
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";
f
function Qa(i,dc){
var ga=i.getElementsByTagName(Bb);
if(ga){
for(var f=0;
f
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;
if(X&&m!=0){
if(N>0&&v!=-1)V=V.substring(0,v);
if(m==13||m==3){
var d=a;
if(d.createTextRange){
var t=d.createTextRange();
t.moveStart("character",d.value.length);
t.select()}
else if(d.setSelectionRange){
d.setSelectionRange(d.value.length,d.value.length)}
}
else{
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();
if(eb=="url"){
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);
var Cb=function(){
S(U(this));
q=wa(this);
da=true;
Fa()}

;
var pb=function(){
if(h)l(h,"aAutoComplete");
l(this,"bAutoComplete")}

;
var ec=function(){
l(this,"aAutoComplete")}

;
function Na(C){
g=G;
S(G);
q=G;
if(!za||Z<=0)return;
cb();
if(C>=Z){
C=Z-1}
if(j!=-1&&C!=j){
l(h,"aAutoComplete");
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}
else if(ja==38){
Na(j-1);
return false}
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()}
else{
cb()}
var Ab="";
if(g.length>0){
var f;
var o;
for(var f=0;
f
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){
var fa=document.selection.createRange().duplicate();
N=fa.text.length}
else if(n.setSelectionRange){
N=n.selectionEnd-n.selectionStart}
return N}

function bb(n){
var v=0;
if(n.createTextRange){
var fa=document.selection.createRange().duplicate();
fa.moveEnd("textedit",1);
v=n.value.length-fa.text.length}
else if(n.setSelectionRange){
v=n.selectionStart}
else{
v=-1}
return v}

function cc(d){
if(d.createTextRange){
var t=d.createTextRange();
t.moveStart("character",d.value.length);
t.select()}
else if(d.setSelectionRange){
d.setSelectionRange(d.value.length,d.value.length)}
}

function jc(Zb,Ea){
if(!Ea)Ea=1;
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;
f
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}
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