人生中要走很多路，有一条路不能回头，就是放弃的路；有一条路不能拒绝，就是成长的路；有一条路不能迷失，就是信念的路；有一条路不能停滞，就是奋斗的路；有一条路不能忘记，就是回家的路；信心满满的走好脚下的每条路，祝你生命中的每一天都很精彩。
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（有人说IE9下面有BUG，LZ用的是落后的XP，居然装不上IE9，去公司在搞搞好了），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。
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即可：
城市我是一个一个手打的。。。
['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 in oCity[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'?'':sortKey[j];
odda = [];
for(var i=0,n=oCity[key][sortKey[j]].length;i<n;i++){
str = '<a rel="nofollow noopener noreferrer" 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，
// 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 */
$:function (arg, context) {
var tagAll, n, eles = [], i, sub = arg.substring(1);
context = context || document;
if (typeof arg == 'string') {
switch (arg.charAt(0)) {
case '#':
return document.getElementById(sub);
break;
case '.':
if (context.getElementsByClassName) return context.getElementsByClassName(sub);
tagAll = Vcity._m.$('*', context);
n = tagAll.length;
for (i = 0; i < n; i++) {
if (tagAll[i].className.indexOf(sub) > -1) eles.push(tagAll[i]);
}
return eles;
break;
default:
return context.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 in oCity){
odiv = this[key] = document.createElement('div');
// 先设置全部隐藏hide
odiv.className = key + ' ' + 'cityTab hide';
sortKey=[];
for(ckey in oCity[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'?'':sortKey[j];
odda = [];
for(var i=0,n=oCity[key][sortKey[j]].length;i<n;i++){
str = '<a rel="nofollow noopener noreferrer" 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CSS
Vcity._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');
var str;
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ul
if (!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);
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);
Vcity._m.addClass('on',target);
});
Vcity._m.on(lis[i],'mouseout',function(event){
event = Vcity._m.getEvent(event);
var target = Vcity._m.getTarget(event);
Vcity._m.removeClass('on',target);
})
}
}
};
本文JavaScript如何实现城市选择控件的效果到此结束。人必须要受过伤才会沉默专注，无论是心灵或肉体上的创伤，对成长都有益处。小编再次感谢大家对我们的支持！