在淘宝旅行上看到的城市选择效果，感觉还不错，就自己的理解重新实现一遍，先看效果，然后再细说实现原理，支持鼠标上下键选择城市，支持直接输入城市名称，拼音首字母，全拼，支持IE6遮盖SELECT，压缩后12K，Demo如下：

修正1：IE9的BUG我查了有点莫名其妙，但是去掉.cityBox这个CSS里面的box-shadow: 2px 2px 3px rgba(0,0,0,0.3);这段CSS，就可以了。

最新的修改过的JS，在底部贴出来了，下载的那个没有更新，如果要用请直接在下面复制代码！

Demo

出发城市： 到达城市：

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我实现的步骤：

一、先用一定的格式罗列出控件所需要的城市以及拼音等，我这里是按照如下格式罗列成一个数组, 如果需要增加城市，直接增加在数组里面

['北京|beijing|bj','上海|shanghai|sh', '重庆|chongqing|cq']

二、因为控件的城市分组按好几类划分，比如：按首字母HOT 、ABCDEFH  、  IJKLMNOP  、 QRSTUVWXYZ 四组划分，

而划分了四组后又按照了首字母划分，所以我用正则表达式和循环把数组重新格式化为一个分组对象，热门城市取前16条。

对象格式如下：

{HOT:{hot:[]},ABCDEFGH:{a:[1,2,3],b:[1,2,3]},IJKLMNOP:{i:[1.2.3],j:[1,2,3]},QRSTUVWXYZ:{}}

所用代码如下：

/*** 格式化城市数组为对象oCity，按照a-h,i-p,q-z,hot热门城市分组：* {HOT:{hot:[]},ABCDEFGH:{a:[1,2,3],b:[1,2,3]},IJKLMNOP:{i:[1.2.3],j:[1,2,3]},QRSTUVWXYZ:{}}**/(function() {var citys =Vcity.allCity, match, letter,regEx=Vcity.regEx,reg2= /^[a-h]$/i, reg3 = /^[i-p]$/i, reg4 = /^[q-z]$/i;if (!Vcity.oCity) {Vcity.oCity={hot:{},ABCDEFGH:{}, IJKLMNOP:{}, QRSTUVWXYZ:{}};//console.log(citys.length);for (var i = 0, n = citys.length; i < n; i++) {match=regEx.exec(citys[i]);letter= match[3].toUpperCase();if(reg2.test(letter)) {if (!Vcity.oCity.ABCDEFGH[letter]) Vcity.oCity.ABCDEFGH[letter] =[];Vcity.oCity.ABCDEFGH[letter].push(match[1]);}else if(reg3.test(letter)) {if (!Vcity.oCity.IJKLMNOP[letter]) Vcity.oCity.IJKLMNOP[letter] =[];Vcity.oCity.IJKLMNOP[letter].push(match[1]);}else if(reg4.test(letter)) {if (!Vcity.oCity.QRSTUVWXYZ[letter]) Vcity.oCity.QRSTUVWXYZ[letter] =[];Vcity.oCity.QRSTUVWXYZ[letter].push(match[1]);}/*热门城市 前16条*/if(i<16){if(!Vcity.oCity.hot['hot']) Vcity.oCity.hot['hot'] =[];Vcity.oCity.hot['hot'].push(match[1]);}}}
})();

三、然后先照着淘宝旅行里面的样子弄出HTML与CSS；这里略过。

四、然后开始建立CitySelector构造函数，根据城市对象，构建生成DOM对象，在按照相应的事件触发。在生成相应的按照A\B\C\D……分组的时候遇到一个

关于排序的问题，我的对象格式是这样的ABCDEFGH:{a:[1,2,3],b:[1,2,3],c:[1,2,3]},里面的小数组要按照字母的顺序排序，但是我用for……in循环生成

出来是乱的，咨询了群里的高人后，处理方法如下：这里单独把KEY拿出来组成一个数组，然后排序后，在根据数组的值作为KEY值，来读取对象！

sortKey=[];for(ckey inoCity[key]){sortKey.push(ckey);//ckey按照ABCDEDG顺序排序
sortKey.sort();}for(var j=0,k = sortKey.length;j<k;j++){odl= document.createElement('dl');odt= document.createElement('dt');odd= document.createElement('dd');odt.innerHTML= sortKey[j] == 'hot'?'&nbsp;':sortKey[j];odda=[];for(var i=0,n=oCity[key][sortKey[j]].length;i<n;i++){str= '<a href="#">' + oCity[key][sortKey[j]][i] + '</a>';odda.push(str);}

五、鼠标上下键移动选择城市的处理方法：在城市弹出后记录一个this.count = 0；然后再获取上下键的按键事件中分别对count值加一或者减一，

当然count的最大值不能大于筛选出来的城市数组的长度，超过长度后归0，小于0后赋值最大值，然后把this.count的值，来作为数组的标获取相应的城市

项：

switch(keycode){case 40: //向下箭头↓this.count++;if(this.count > len-1) this.count = 0;for(var i=0;i<len;i++){Vcity._m.removeClass('on',lis[i]);}Vcity._m.addClass('on',lis[this.count]);break;case 38: //向上箭头↑this.count--;if(this.count<0) this.count = len-1;for(i=0;i<len;i++){Vcity._m.removeClass('on',lis[i]);}Vcity._m.addClass('on',lis[this.count]);break;case 13: //enter键this.input.value = Vcity.regExChiese.exec(lis[this.count].innerHTML)[0];Vcity._m.addClass('hide',this.ul);Vcity._m.addClass('hide',this.ul);/*IE6*/Vcity._m.addClass('hide',this.myIframe);break;default:break;}

六、IE中对SELECT的遮挡也是一个增加代码的地方，因为城市弹出框的大小是变化的，然后下拉的城市列也是根据筛选出来的值而变化，所以得每操作一个变化的

地方的时候就重新给iframe设置长度和宽度，苦逼的处理方法啊，所以就多了这样一个方法，然后在改变尺寸的时候，应用一下就可以了。

    /*IE6的改变遮罩SELECT 的 IFRAME尺寸大小*/changeIframe:function(){if(!this.isIE6)return;this.myIframe.style.width = this.rootDiv.offsetWidth + 'px';this.myIframe.style.height = this.rootDiv.offsetHeight + 'px';},

7、弹出框的取消问题，这个问题最开始我是设置document的click事件关闭层，然后再弹出的层上阻止click事件的冒泡，但是这样两个层有同时出现的可能，

如这个反例：http://www.cnblogs.com/NNUF/archive/2012/06/24/2560557.html  ； 这里要感谢一下JS丛林群里面的‘搞搞破鞋’同学的方法，取消INPUT对

click的冒泡，然后关键是如下红色字体：

 //设置点击文档隐藏弹出的城市选择框Vcity._m.on(document, 'click', function(event) {event=Vcity._m.getEvent(event);var target =Vcity._m.getTarget(event);if(target == that.input) return false;//console.log(target.className);if (that.cityBox)Vcity._m.addClass('hide', that.cityBox);if (that.ul)Vcity._m.addClass('hide', that.ul);if(that.myIframe)Vcity._m.addClass('hide',that.myIframe);});

8、输入框输入拼音或者文字或者拼音首字母筛选城市，这个就是直接用正则表达式在最开始的数组里面筛选数据即可：

var reg = new RegExp("^" + value + "|\\|" + value, 'gi');var searchResult =[];for (var i = 0, n = Vcity.allCity.length; i < n; i++) {if(reg.test(Vcity.allCity[i])) {var match =Vcity.regEx.exec(Vcity.allCity[i]);if (searchResult.length !== 0) {str= '<li><b class="cityname">' + match[1] + '</b><b class="cityspell">' + match[2] + '</b></li>';}else{str= '<li class="on"><b class="cityname">' + match[1] + '</b><b class="cityspell">' + match[2] + '</b></li>';}searchResult.push(str);}}

然后总的最新JS代码如下：

/*** ---------------------------------------- ** 城市选择组件 v1.0* Author: VVG* QQ: 83816819* Mail: mysheller@163.com* http://www.cnblogs.com/NNUF/* ---------------------------------------- ** Date: 2012-07-10* ---------------------------------------- ***//*** 全局空间 Vcity**/
var Vcity ={};/*** 静态方法集* @name _m**/Vcity._m={/*选择元素*/$:function(arg, context) {var tagAll, n, eles = [], i, sub = arg.substring(1);context= context ||document;if (typeof arg == 'string') {switch (arg.charAt(0)) {case '#':returndocument.getElementById(sub);break;case '.':if (context.getElementsByClassName) returncontext.getElementsByClassName(sub);tagAll= Vcity._m.$('*', context);n=tagAll.length;for (i = 0; i < n; i++) {if (tagAll[i].className.indexOf(sub) > -1) eles.push(tagAll[i]);}returneles;break;default:returncontext.getElementsByTagName(arg);break;}}},/*绑定事件*/on:function(node, type, handler) {node.addEventListener? node.addEventListener(type, handler, false) : node.attachEvent('on' +type, handler);},/*获取事件*/getEvent:function(event){return event ||window.event;},/*获取事件目标*/getTarget:function(event){return event.target ||event.srcElement;},/*获取元素位置*/getPos:function(node) {var scrollx = document.documentElement.scrollLeft ||document.body.scrollLeft,scrollt= document.documentElement.scrollTop ||document.body.scrollTop;var pos =node.getBoundingClientRect();return {top:pos.top + scrollt, right:pos.right + scrollx, bottom:pos.bottom + scrollt, left:pos.left +scrollx }},/*添加样式名*/addClass:function(c, node) {if(!node)return;node.className= Vcity._m.hasClass(c,node) ? node.className : node.className + ' ' +c ;},/*移除样式名*/removeClass:function(c, node) {var reg = new RegExp("(^|\\s+)" + c + "(\\s+|$)", "g");if(!Vcity._m.hasClass(c,node))return;node.className= reg.test(node.className) ? node.className.replace(reg, '') : node.className;},/*是否含有CLASS*/hasClass:function(c, node) {if(!node || !node.className)return false;return node.className.indexOf(c)>-1;},/*阻止冒泡*/stopPropagation:function(event) {event= event ||window.event;event.stopPropagation? event.stopPropagation() : event.cancelBubble = true;},/*去除两端空格*/trim:function(str) {return str.replace(/^\s+|\s+$/g,'');}
};/*所有城市数据,可以按照格式自行添加（北京|beijing|bj），前16条为热门城市*/Vcity.allCity= ['北京|beijing|bj','上海|shanghai|sh', '重庆|chongqing|cq',  '深圳|shenzhen|sz', '广州|guangzhou|gz', '杭州|hangzhou|hz','南京|nanjing|nj', '苏州|shuzhou|sz', '天津|tianjin|tj', '成都|chengdu|cd', '南昌|nanchang|nc', '三亚|sanya|sy','青岛|qingdao|qd','厦门|xiamen|xm', '西安|xian|xa','长沙|changsha|cs','合肥|hefei|hf','西藏|xizang|xz', '内蒙古|neimenggu|nmg', '安庆|anqing|aq', '阿泰勒|ataile|atl', '安康|ankang|ak','阿克苏|akesu|aks', '包头|baotou|bt', '北海|beihai|bh', '百色|baise|bs','保山|baoshan|bs', '长治|changzhi|cz', '长春|changchun|cc', '常州|changzhou|cz', '昌都|changdu|cd','朝阳|chaoyang|cy', '常德|changde|cd', '长白山|changbaishan|cbs', '赤峰|chifeng|cf', '大同|datong|dt', '大连|dalian|dl', '达县|daxian|dx', '东营|dongying|dy', '大庆|daqing|dq', '丹东|dandong|dd','大理|dali|dl', '敦煌|dunhuang|dh', '鄂尔多斯|eerduosi|eeds', '恩施|enshi|es', '福州|fuzhou|fz', '阜阳|fuyang|fy', '贵阳|guiyang|gy','桂林|guilin|gl', '广元|guangyuan|gy', '格尔木|geermu|gem', '呼和浩特|huhehaote|hhht', '哈密|hami|hm','黑河|heihe|hh', '海拉尔|hailaer|hle', '哈尔滨|haerbin|heb', '海口|haikou|hk', '黄山|huangshan|hs', '邯郸|handan|hd','汉中|hanzhong|hz', '和田|hetian|ht', '晋江|jinjiang|jj', '锦州|jinzhou|jz', '景德镇|jingdezhen|jdz','嘉峪关|jiayuguan|jyg', '井冈山|jinggangshan|jgs', '济宁|jining|jn', '九江|jiujiang|jj', '佳木斯|jiamusi|jms', '济南|jinan|jn','喀什|kashi|ks', '昆明|kunming|km', '康定|kangding|kd', '克拉玛依|kelamayi|klmy', '库尔勒|kuerle|kel', '库车|kuche|kc', '兰州|lanzhou|lz','洛阳|luoyang|ly', '丽江|lijiang|lj', '林芝|linzhi|lz', '柳州|liuzhou|lz', '泸州|luzhou|lz', '连云港|lianyungang|lyg', '黎平|liping|lp','连成|liancheng|lc', '拉萨|lasa|ls', '临沧|lincang|lc', '临沂|linyi|ly', '芒市|mangshi|ms', '牡丹江|mudanjiang|mdj', '满洲里|manzhouli|mzl', '绵阳|mianyang|my','梅县|meixian|mx', '漠河|mohe|mh', '南充|nanchong|nc', '南宁|nanning|nn', '南阳|nanyang|ny', '南通|nantong|nt', '那拉提|nalati|nlt','宁波|ningbo|nb', '攀枝花|panzhihua|pzh', '衢州|quzhou|qz', '秦皇岛|qinhuangdao|qhd', '庆阳|qingyang|qy', '齐齐哈尔|qiqihaer|qqhe','石家庄|shijiazhuang|sjz',  '沈阳|shenyang|sy', '思茅|simao|sm', '铜仁|tongren|tr', '塔城|tacheng|tc', '腾冲|tengchong|tc', '台州|taizhou|tz','通辽|tongliao|tl', '太原|taiyuan|ty', '威海|weihai|wh', '梧州|wuzhou|wz', '文山|wenshan|ws', '无锡|wuxi|wx', '潍坊|weifang|wf', '武夷山|wuyishan|wys', '乌兰浩特|wulanhaote|wlht','温州|wenzhou|wz', '乌鲁木齐|wulumuqi|wlmq', '万州|wanzhou|wz', '乌海|wuhai|wh', '兴义|xingyi|xy', '西昌|xichang|xc',  '襄樊|xiangfan|xf','西宁|xining|xn', '锡林浩特|xilinhaote|xlht', '西双版纳|xishuangbanna|xsbn', '徐州|xuzhou|xz', '义乌|yiwu|yw', '永州|yongzhou|yz', '榆林|yulin|yl', '延安|yanan|ya', '运城|yuncheng|yc','烟台|yantai|yt', '银川|yinchuan|yc', '宜昌|yichang|yc', '宜宾|yibin|yb', '盐城|yancheng|yc', '延吉|yanji|yj', '玉树|yushu|ys', '伊宁|yining|yn', '珠海|zhuhai|zh', '昭通|zhaotong|zt','张家界|zhangjiajie|zjj', '舟山|zhoushan|zs', '郑州|zhengzhou|zz', '中卫|zhongwei|zw', '芷江|zhijiang|zj', '湛江|zhanjiang|zj'];/*正则表达式 筛选中文城市名、拼音、首字母*/Vcity.regEx= /^([\u4E00-\u9FA5\uf900-\ufa2d]+)\|(\w+)\|(\w)\w*$/i;
Vcity.regExChiese= /([\u4E00-\u9FA5\uf900-\ufa2d]+)/;/*** 格式化城市数组为对象oCity，按照a-h,i-p,q-z,hot热门城市分组：* {HOT:{hot:[]},ABCDEFGH:{a:[1,2,3],b:[1,2,3]},IJKLMNOP:{i:[1.2.3],j:[1,2,3]},QRSTUVWXYZ:{}}**/(function() {var citys =Vcity.allCity, match, letter,regEx=Vcity.regEx,reg2= /^[a-h]$/i, reg3 = /^[i-p]$/i, reg4 = /^[q-z]$/i;if (!Vcity.oCity) {Vcity.oCity={hot:{},ABCDEFGH:{}, IJKLMNOP:{}, QRSTUVWXYZ:{}};//console.log(citys.length);for (var i = 0, n = citys.length; i < n; i++) {match=regEx.exec(citys[i]);letter= match[3].toUpperCase();if(reg2.test(letter)) {if (!Vcity.oCity.ABCDEFGH[letter]) Vcity.oCity.ABCDEFGH[letter] =[];Vcity.oCity.ABCDEFGH[letter].push(match[1]);}else if(reg3.test(letter)) {if (!Vcity.oCity.IJKLMNOP[letter]) Vcity.oCity.IJKLMNOP[letter] =[];Vcity.oCity.IJKLMNOP[letter].push(match[1]);}else if(reg4.test(letter)) {if (!Vcity.oCity.QRSTUVWXYZ[letter]) Vcity.oCity.QRSTUVWXYZ[letter] =[];Vcity.oCity.QRSTUVWXYZ[letter].push(match[1]);}/*热门城市 前16条*/if(i<16){if(!Vcity.oCity.hot['hot']) Vcity.oCity.hot['hot'] =[];Vcity.oCity.hot['hot'].push(match[1]);}}}
})();/*城市HTML模板*/Vcity._template=['<p class="tip">热门城市(支持汉字/拼音)</p>','<ul>','<li class="on">热门城市</li>','<li>ABCDEFGH</li>','<li>IJKLMNOP</li>','<li>QRSTUVWXYZ</li>','</ul>'];/*** 城市控件构造函数* @CitySelector**/Vcity.CitySelector= function() {this.initialize.apply(this, arguments);
};Vcity.CitySelector.prototype={constructor:Vcity.CitySelector,/*初始化*/initialize :function(options) {var input =options.input;this.input = Vcity._m.$('#'+input);this.inputEvent();},/*** @createWarp* 创建城市BOX HTML 框架**/createWarp:function(){var inputPos = Vcity._m.getPos(this.input);var div = this.rootDiv = document.createElement('div');var that = this;//设置DIV阻止冒泡Vcity._m.on(this.rootDiv,'click',function(event){Vcity._m.stopPropagation(event);});//设置点击文档隐藏弹出的城市选择框Vcity._m.on(document, 'click', function(event) {event=Vcity._m.getEvent(event);var target =Vcity._m.getTarget(event);if(target == that.input) return false;//console.log(target.className);if (that.cityBox)Vcity._m.addClass('hide', that.cityBox);if (that.ul)Vcity._m.addClass('hide', that.ul);if(that.myIframe)Vcity._m.addClass('hide',that.myIframe);});div.className= 'citySelector';div.style.position= 'absolute';div.style.left= inputPos.left + 'px';div.style.top= inputPos.bottom + 'px';div.style.zIndex= 999999;//判断是否IE6，如果是IE6需要添加iframe才能遮住SELECT框var isIe = (document.all) ? true : false;var isIE6 = this.isIE6 = isIe && !window.XMLHttpRequest;if(isIE6){var myIframe = this.myIframe =  document.createElement('iframe');myIframe.frameborder= '0';myIframe.src= 'about:blank';myIframe.style.position= 'absolute';myIframe.style.zIndex= '-1';this.rootDiv.appendChild(this.myIframe);}var childdiv = this.cityBox = document.createElement('div');childdiv.className= 'cityBox';childdiv.id= 'cityBox';childdiv.innerHTML= Vcity._template.join('');var hotCity = this.hotCity =  document.createElement('div');hotCity.className= 'hotCity';childdiv.appendChild(hotCity);div.appendChild(childdiv);this.createHotCity();},/*** @createHotCity* TAB下面DIV：hot,a-h,i-p,q-z 分类HTML生成，DOM操作* {HOT:{hot:[]},ABCDEFGH:{a:[1,2,3],b:[1,2,3]},IJKLMNOP:{},QRSTUVWXYZ:{}}**/createHotCity:function(){var odiv,odl,odt,odd,odda=[],str,key,ckey,sortKey,regEx =Vcity.regEx,oCity=Vcity.oCity;for(key inoCity){odiv= this[key] = document.createElement('div');//先设置全部隐藏hideodiv.className = key + ' ' + 'cityTab hide';sortKey=[];for(ckey inoCity[key]){sortKey.push(ckey);//ckey按照ABCDEDG顺序排序
sortKey.sort();}for(var j=0,k = sortKey.length;j<k;j++){odl= document.createElement('dl');odt= document.createElement('dt');odd= document.createElement('dd');odt.innerHTML= sortKey[j] == 'hot'?'&nbsp;':sortKey[j];odda=[];for(var i=0,n=oCity[key][sortKey[j]].length;i<n;i++){str= '<a href="javascript:">' + oCity[key][sortKey[j]][i] + '</a>';odda.push(str);}odd.innerHTML= odda.join('');odl.appendChild(odt);odl.appendChild(odd);odiv.appendChild(odl);}//移除热门城市的隐藏CSSVcity._m.removeClass('hide',this.hot);this.hotCity.appendChild(odiv);}document.body.appendChild(this.rootDiv);/*IE6*/this.changeIframe();this.tabChange();this.linkEvent();},/***  tab按字母顺序切换*  @ tabChange**/tabChange:function(){var lis = Vcity._m.$('li',this.cityBox);var divs = Vcity._m.$('div',this.hotCity);var that = this;for(var i=0,n=lis.length;i<n;i++){lis[i].index=i;lis[i].onclick= function(){for(var j=0;j<n;j++){Vcity._m.removeClass('on',lis[j]);Vcity._m.addClass('hide',divs[j]);}Vcity._m.addClass('on',this);Vcity._m.removeClass('hide',divs[this.index]);/*IE6 改变TAB的时候 改变Iframe 大小*/that.changeIframe();};}},/*** 城市LINK事件*  @linkEvent**/linkEvent:function(){var links = Vcity._m.$('a',this.hotCity);var that = this;for(var i=0,n=links.length;i<n;i++){links[i].onclick= function(){that.input.value= this.innerHTML;Vcity._m.addClass('hide',that.cityBox);/*点击城市名的时候隐藏myIframe*/Vcity._m.addClass('hide',that.myIframe);}}},/*** INPUT城市输入框事件* @inputEvent**/inputEvent:function(){var that = this;Vcity._m.on(this.input,'click',function(event){event= event ||window.event;if(!that.cityBox){that.createWarp();}else if(!!that.cityBox && Vcity._m.hasClass('hide',that.cityBox)){//slideul 不存在或者 slideul存在但是是隐藏的时候 两者不能共存if(!that.ul || (that.ul && Vcity._m.hasClass('hide',that.ul))){Vcity._m.removeClass('hide',that.cityBox);/*IE6 移除iframe 的hide 样式*///alert('click');Vcity._m.removeClass('hide',that.myIframe);that.changeIframe();}}});Vcity._m.on(this.input,'focus',function(){that.input.select();if(that.input.value == '城市名') that.input.value = '';});Vcity._m.on(this.input,'blur',function(){if(that.input.value == '') that.input.value = '城市名';});Vcity._m.on(this.input,'keyup',function(event){event= event ||window.event;var keycode =event.keyCode;Vcity._m.addClass('hide',that.cityBox);that.createUl();/*移除iframe 的hide 样式*/Vcity._m.removeClass('hide',that.myIframe);//下拉菜单显示的时候捕捉按键事件if(that.ul && !Vcity._m.hasClass('hide',that.ul) && !that.isEmpty){that.KeyboardEvent(event,keycode);}});},/*** 生成下拉选择列表* @ createUl**/createUl:function() {//console.log('createUL');varstr;var value = Vcity._m.trim(this.input.value);//当value不等于空的时候执行if (value !== '') {var reg = new RegExp("^" + value + "|\\|" + value, 'gi');var searchResult =[];for (var i = 0, n = Vcity.allCity.length; i < n; i++) {if(reg.test(Vcity.allCity[i])) {var match =Vcity.regEx.exec(Vcity.allCity[i]);if (searchResult.length !== 0) {str= '<li><b class="cityname">' + match[1] + '</b><b class="cityspell">' + match[2] + '</b></li>';}else{str= '<li class="on"><b class="cityname">' + match[1] + '</b><b class="cityspell">' + match[2] + '</b></li>';}searchResult.push(str);}}this.isEmpty = false;//如果搜索数据为空if (searchResult.length == 0) {this.isEmpty = true;str= '<li class="empty">对不起，没有找到数据 "<em>' + value + '</em>"</li>';searchResult.push(str);}//如果slideul不存在则添加ulif (!this.ul) {var ul = this.ul = document.createElement('ul');ul.className= 'cityslide';this.rootDiv && this.rootDiv.appendChild(ul);//记录按键次数，方向键this.count = 0;}else if (this.ul && Vcity._m.hasClass('hide', this.ul)) {this.count = 0;Vcity._m.removeClass('hide', this.ul);}this.ul.innerHTML = searchResult.join('');/*IE6*/this.changeIframe();//绑定Li事件this.liEvent();}else{Vcity._m.addClass('hide',this.ul);Vcity._m.removeClass('hide',this.cityBox);Vcity._m.removeClass('hide',this.myIframe);this.changeIframe();}},/*IE6的改变遮罩SELECT 的 IFRAME尺寸大小*/changeIframe:function(){if(!this.isIE6)return;this.myIframe.style.width = this.rootDiv.offsetWidth + 'px';this.myIframe.style.height = this.rootDiv.offsetHeight + 'px';},/*** 特定键盘事件，上、下、Enter键* @ KeyboardEvent**/KeyboardEvent:function(event,keycode){var lis = Vcity._m.$('li',this.ul);var len =lis.length;switch(keycode){case 40: //向下箭头↓this.count++;if(this.count > len-1) this.count = 0;for(var i=0;i<len;i++){Vcity._m.removeClass('on',lis[i]);}Vcity._m.addClass('on',lis[this.count]);break;case 38: //向上箭头↑this.count--;if(this.count<0) this.count = len-1;for(i=0;i<len;i++){Vcity._m.removeClass('on',lis[i]);}Vcity._m.addClass('on',lis[this.count]);break;case 13: //enter键this.input.value = Vcity.regExChiese.exec(lis[this.count].innerHTML)[0];Vcity._m.addClass('hide',this.ul);Vcity._m.addClass('hide',this.ul);/*IE6*/Vcity._m.addClass('hide',this.myIframe);break;default:break;}},/*** 下拉列表的li事件* @ liEvent**/liEvent:function(){var that = this;var lis = Vcity._m.$('li',this.ul);for(var i = 0,n = lis.length;i < n;i++){Vcity._m.on(lis[i],'click',function(event){event=Vcity._m.getEvent(event);var target =Vcity._m.getTarget(event);if(target.nodeName.toUpperCase() !== "LI") target =target.parentNode;if(target.nodeName.toUpperCase() !== "LI") return;that.input.value= Vcity.regExChiese.exec(target.innerHTML)[0];Vcity._m.addClass('hide',that.ul);/*IE6 下拉菜单点击事件*/Vcity._m.addClass('hide',that.myIframe);});Vcity._m.on(lis[i],'mouseover',function(event){event=Vcity._m.getEvent(event);var target =Vcity._m.getTarget(event);if(target.nodeName.toUpperCase() !== "LI") target =target.parentNode;if(target.nodeName.toUpperCase() !== "LI") return;Vcity._m.addClass('on',target);});Vcity._m.on(lis[i],'mouseout',function(event){event=Vcity._m.getEvent(event);var target =Vcity._m.getTarget(event);if(target.nodeName.toUpperCase() !== "LI") target =target.parentNode;if(target.nodeName.toUpperCase() !== "LI") return;Vcity._m.removeClass('on',target);})}}
};

 调用方法：只需传入需要填写城市的text表单的ID即可，如下：

var test=new Vcity.CitySelector({input:'citySelect'});var test2=new Vcity.CitySelector({input:'citySelect1'});

如有代码某处有好的改进建议，请留言告知，感激不进！

源代码下载：城市选择控件.rar

转载请注明出处：http://www.cnblogs.com/NNUF/