A good Ctrip-like custom data drop-down selection select_javascript technique

/* 
*id ： id 当前插件的父元素 
*data ： json 选择的数据（json格式） 
*bool ： true/false data数据如果要分离成两个 值为true 
*config ： 配置data的内部对象(type在bool为true的时候生效) 
{ 
id : 数据字段, 
name : 数据名称, 
alias : 数据名称首字母, 
type : 数据类型 
} 
*fn ： function fn(){} 回调函数，点击生成标签的时执行的函 
*/ 
function YSelect(id,Ydata,bool,config,fn){ 
var data = []; 
Yselect_close = {}; 
var name_list = {A:[],B:[],C:[],D:[],E:[],F:[],G:[],H:[],I:[],J:[],K:[],L:[],M:[],N:[],O:[],P:[],Q:[],R:[],S:[],T:[],U:[],V:[],W:[],X:[],Y:[],Z:[],其他:[]} //新建数组，防止出现undefind 
var YDropdowns = document.getElementById(id); 
function Pretreatment(){ //处理数据 
var CatalogData = []; 
var BrandData = []; 
var china = []; 
var foreign = []; 
for (var i in Ydata) { 
if (Ydata[i][config.type] == null) 
CatalogData.push(Ydata[i][config.id]+';'+Ydata[i][config.name]+';'+Ydata[i][config.alias]) 
else 
BrandData.push(Ydata[i][config.id]+';'+Ydata[i][config.name]+';'+Ydata[i][config.alias]+';'+Ydata[i][config.type]) 
}; 
if (BrandData != "") { 
for (var i = 0 ; i < BrandData.length ; i++) { 
var str = BrandData[i].split(';') 
if (str[3] == 0) china.push(str[0] + ';' + str[1] + ';' + str[2]); 
else foreign.push(str[0] + ';' + str[1] + ';' + str[2]); 
} 
if (bool) { 
data = china; 
return data; 
}else { 
data = foreign; 
return data; 
} 
}else{ 
data = CatalogData; 
return data; //返回出数据 
} 
}; 
function jsondata(data_name,ida){ //处理Pretreatment返回出的数据 
var tit = []; //定义首字母 
var Ahtml = {A:[],B:[],C:[],D:[],E:[],F:[],G:[],H:[],I:[],J:[],K:[],L:[],M:[],N:[],O:[],P:[],Q:[],R:[],S:[],T:[],U:[],V:[],W:[],X:[],Y:[],Z:[],其他:[]}; //新建数组，防止出现undefind 
var Yselect_box = document.createElement("div"); //新建选择框父元素 
Yselect_box.id = ida+"_Yselect_box"; 
var Yselect_div = document.createElement("div"); //字母返回值的容器 
var Yselect_letter = document.createElement("p"); //26字母容器 
Yselect_letter.id = ida+'_Yselect_letter' 
var stylelink = document.createElement("style") //创建皮肤，有两套皮肤可供选择 
//stylelink.innerHTML = '#'+id+'_Yselect_box{width: 100%;position:absolute;top:30px;left:0;z-index:9999;background:#fff}#'+id+'_Yselect_box p{background: #469bde;padding:0 10px;}#'+id+'_Yselect_box p span.close{font: 16px/20px 微软雅黑;cursor:pointer;position:absolute;top:0;right:0;color:#f00}#'+id+'_Yselect_box .hide_tag{border: 1px solid #469bde;padding:5px;display: none;min-height:100px;max-height:300px;min-width:300px;max-width:800px;overflow:auto}#'+id+'_Yselect_box p a{padding:5px;line-height: 28px;color:#fff}#'+id+'_Yselect_box .hide_tag a{width:80px;display:block;text-decoration:none;padding:5px;line-height: 12px;font-size:12px;float:left;color:#444;overflow: hidden; text-overflow:ellipsis;white-space:nowrap;}#'+id+'_Yselect_box .hide_tag a:hover{background:#469bde;color:#fff;}#'+id+'_Yselect_box .cur{border-bottom: 2px solid #fac51f}'; 
stylelink.innerHTML = '#'+ida+'_Yselect_box{width: 100%;min-width:500px;max-width:800px;position:absolute;top:30px;left:0;z-index:9999;background:#fff;border:1px solid #ddd;}#'+ida+'_Yselect_box p{padding:0 10px;}#'+ida+'_Yselect_box p span.close{font: 16px/20px 微软雅黑;cursor:pointer;position:absolute;top:0;right:0;color:#666}#'+ida+'_Yselect_box .hide_tag{padding:5px 10px;display: none;min-height:50px;max-height:200px;overflow:auto}#'+ida+'_Yselect_box p a{padding:5px;line-height: 28px;color:#333;border-bottom:2px solid #bbb;font-weight:bold}#'+ida+'_Yselect_box .hide_tag a{width:80px;display:block;text-decoration:none;padding:5px;line-height: 12px;font-size:12px;float:left;color:#444;overflow: hidden; text-overflow:ellipsis;white-space:nowrap;}#'+ida+'_Yselect_box .hide_tag a:hover{background:#469bde;color:#fff;}#'+ida+'_Yselect_box a.cur{border-bottom: 2px solid #469bde;color:#469bde}'; 
for (var i = 0 ; i < data_name.length ; i++) { 
var str = data_name[i].split(';') 
tit.push(str[2].charAt(0).toLocaleUpperCase()) //判断首字母，赋值给tit 
}; 
for(var j in tit){ 
if(name_list[tit[j]]) 
name_list[tit[j]].push(data_name[j]); 
else name_list.其他.push(data_name[j]) 
} //将数据插入name_list里 
for (var k in name_list){ //处理数据，以字母分离，为空就隐藏 
if (name_list[k].length != 0) { 
for (var i = 0 ; i < name_list[k].length ; i++) { 
var allhtml = '<a href="javascript:" onclick="'+fn+'(this)" title="'+ name_list[k][i].split(';')[1] + '" name="'+ name_list[k][i].split(';')[0] + '">' + name_list[k][i].split(';')[1] + '</a>'; 
Ahtml[k] += allhtml ; 
}; 
Yselect_letter.innerHTML += '<a href="javascript:" >'+k+'</a>'; 
Yselect_div.innerHTML += '<div class="hide_tag">'+Ahtml[k]+'</div>'; 
}; 
} 
var bool = true 
Yselect_box.innerHTML = '<p id="'+ida+'_Yselect_letter'+'">'+Yselect_letter.innerHTML+'<span class="close">x</span></p>'+ Yselect_div.innerHTML; 
YDropdowns.appendChild(Yselect_box); 
YDropdowns.appendChild(stylelink); //将select插入页面 
Yselect_box.getElementsByTagName('p')[0].getElementsByTagName('span')[0].onclick = function Yselect_close(){ 
YDropdowns.removeChild(Yselect_box) 
YDropdowns.removeChild(stylelink); 
bool = false 
} //点击销毁select 
Yselect_close.close = function Yselect_close(obool){ 
if(obool){ 
YDropdowns.removeChild(Yselect_box) 
YDropdowns.removeChild(stylelink); 
bool = false 
return 
}; 
if (bool) { 
YDropdowns.removeChild(Yselect_box) 
YDropdowns.removeChild(stylelink); 
} 
} //销毁select函数 
return Yselect_close 
} 
jsondata(Pretreatment(),id) 
navlist(id) 
function navlist(ids){ //tab选项卡处理函数 
var a = document.getElementById(ids+'_Yselect_letter').getElementsByTagName('a'); 
var div = document.getElementById(ids+'_Yselect_box').getElementsByTagName('div'); 
div[0].style.display = "block" ; a[0].className = "cur"; 
for (var i = 0 ; i < a.length ; i++) { 
a[i].index = i; 
a[i].onclick = function(){ 
for (var j = 0 ; j < a.length ; j++){ 
div[j].style.display = "none"; 
a[j].className = ""; 
}; 
div[this.index].style.display = "block"; 
this.className = "cur" 
}; 
}; 
}; 
};