需求 : 热门城市、列表中的城市都需要在数据库中查询出来后构建列表，并按a-z排列，输入字母可以实现查询。
多城市选择器实现效果图：
实现：
1 后台根据登录用户获取列表中城市和热门城市的数据
@RequestMapping(value = "/getCity.do")
2 public void getCity(PrintWriter printWriter, HttpServletResponse response)
3 {
4 response.setContentType("text/html;charset=UTF-8");
5 User user = this.getLoginUser();
6 //查询出系统登陆人所有的所属区域名称
7 String allCity = getAllCityProperty(user.getId(), "areaName");
8 String hotCity = getHotCity(allCity);
9 JSONObject json = new JSONObject();
10 json.accumulate("hotCity",hotCity);
11 json.accumulate("allCity",allCity);
12 printWriter.print(json.toString());
13 printWriter.flush();
14 printWriter.close();
15 }2 前台打开界面的时候通过ajax获取城市和热门城市
1 window.onload=function(){
2 var url = "/xxx/getCity.do";
3 var params = {};
4 $.getJSON(url,params,function(data){
5 if(data.length==0)
6 {
7 $.messager.alert('提示',"未找到数据");
8 }else{
9 var hotString = data.hotCity;
10 var allString = data.allCity;
11 new Vcity.CitySelector({input:'city'},allString,hotString);
12 }
13 });
14 }3 citys.js 根据百度上的城市选择组件 新增热门城市和城市变量
/* *
* ---------------------------------------- *
* 城市选择组件 v1.0
* Author: zcx
* ---------------------------------------- *
* Date: 2016-05-17
* ---------------------------------------- *
* */
/* *
* 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,'');
}
};
/* 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*\|(\d+)$/i;
Vcity.regExChiese = /([\u4E00-\u9FA5\uf900-\ufa2d]+)/;
function adapterCity (citylist,hotStr) {
if(!citylist){
return;
}
var citys = citylist;
var match;
var letter;
var regEx = Vcity.regEx,
reg2 = /^[a]$/i, reg3 = /^[b]$/i, reg4 = /^[c]$/i;
reg5 = /^[d]$/i, reg6 = /^[e]$/i, reg7 = /^[f]$/i;
reg8 = /^[g]$/i, reg9 = /^[h]$/i, reg10 = /^[i]$/i;
reg11 = /^[j]$/i, reg12 = /^[k]$/i, reg13 = /^[l]$/i;
reg14 = /^[m]$/i, reg15 = /^[n]$/i, reg16 = /^[o]$/i;
reg17 = /^[p]$/i, reg18 = /^[q]$/i, reg19 = /^[r]$/i;
reg20 = /^[s]$/i, reg21 = /^[t]$/i, reg22 = /^[u]$/i;
reg23 = /^[v]$/i, reg24 = /^[w]$/i, reg25 = /^[x]$/i;
reg26 = /^[y]$/i, reg27 = /^[z]$/i;
//if (!Vcity.oCity) {
Vcity.oCity = {hot:{},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:{}};
//console.log(citys.length);
for (var i = 0; i < citys.length; i++) {
match = regEx.exec(citys[i]);
letter = match[3].toUpperCase();
if (reg2.test(letter)) {
if (!Vcity.oCity.A[letter]) Vcity.oCity.A[letter] = [];
Vcity.oCity.A[letter].push(match[1]);
} else if (reg3.test(letter)) {
if (!Vcity.oCity.B[letter]) Vcity.oCity.B[letter] = [];
Vcity.oCity.B[letter].push(match[1]);
} else if (reg4.test(letter)) {
if (!Vcity.oCity.C[letter]) Vcity.oCity.C[letter] = [];
Vcity.oCity.C[letter].push(match[1]);
}else if (reg5.test(letter)) {
if (!Vcity.oCity.D[letter]) Vcity.oCity.D[letter] = [];
Vcity.oCity.D[letter].push(match[1]);
}else if (reg6.test(letter)) {
if (!Vcity.oCity.E[letter]) Vcity.oCity.E[letter] = [];
Vcity.oCity.E[letter].push(match[1]);
}else if (reg7.test(letter)) {
if (!Vcity.oCity.F[letter]) Vcity.oCity.F[letter] = [];
Vcity.oCity.F[letter].push(match[1]);
}else if (reg8.test(letter)) {
if (!Vcity.oCity.G[letter]) Vcity.oCity.G[letter] = [];
Vcity.oCity.G[letter].push(match[1]);
}else if (reg9.test(letter)) {
if (!Vcity.oCity.H[letter]) Vcity.oCity.H[letter] = [];
Vcity.oCity.H[letter].push(match[1]);
}else if (reg10.test(letter)) {
if (!Vcity.oCity.I[letter]) Vcity.oCity.I[letter] = [];
Vcity.oCity.I[letter].push(match[1]);
}else if (reg11.test(letter)) {
if (!Vcity.oCity.J[letter]) Vcity.oCity.J[letter] = [];
Vcity.oCity.J[letter].push(match[1]);
}else if (reg12.test(letter)) {
if (!Vcity.oCity.K[letter]) Vcity.oCity.K[letter] = [];
Vcity.oCity.K[letter].push(match[1]);
}else if (reg13.test(letter)) {
if (!Vcity.oCity.L[letter]) Vcity.oCity.L[letter] = [];
Vcity.oCity.L[letter].push(match[1]);
}else if (reg14.test(letter)) {
if (!Vcity.oCity.M[letter]) Vcity.oCity.M[letter] = [];
Vcity.oCity.M[letter].push(match[1]);
}else if (reg15.test(letter)) {
if (!Vcity.oCity.N[letter]) Vcity.oCity.N[letter] = [];
Vcity.oCity.N[letter].push(match[1]);
}else if (reg16.test(letter)) {
if (!Vcity.oCity.O[letter]) Vcity.oCity.O[letter] = [];
Vcity.oCity.O[letter].push(match[1]);
}else if (reg17.test(letter)) {
if (!Vcity.oCity.P[letter]) Vcity.oCity.P[letter] = [];
Vcity.oCity.P[letter].push(match[1]);
}else if (reg18.test(letter)) {
if (!Vcity.oCity.Q[letter]) Vcity.oCity.Q[letter] = [];
Vcity.oCity.Q[letter].push(match[1]);
}else if (reg19.test(letter)) {
if (!Vcity.oCity.R[letter]) Vcity.oCity.R[letter] = [];
Vcity.oCity.R[letter].push(match[1]);
}else if (reg20.test(letter)) {
if (!Vcity.oCity.S[letter]) Vcity.oCity.S[letter] = [];
Vcity.oCity.S[letter].push(match[1]);
}else if (reg21.test(letter)) {
if (!Vcity.oCity.T[letter]) Vcity.oCity.T[letter] = [];
Vcity.oCity.T[letter].push(match[1]);
}else if (reg22.test(letter)) {
if (!Vcity.oCity.U[letter]) Vcity.oCity.U[letter] = [];
Vcity.oCity.U[letter].push(match[1]);
}else if (reg23.test(letter)) {
if (!Vcity.oCity.V[letter]) Vcity.oCity.V[letter] = [];
Vcity.oCity.V[letter].push(match[1]);
}else if (reg24.test(letter)) {
if (!Vcity.oCity.W[letter]) Vcity.oCity.W[letter] = [];
Vcity.oCity.W[letter].push(match[1]);
}else if (reg25.test(letter)) {
if (!Vcity.oCity.X[letter]) Vcity.oCity.X[letter] = [];
Vcity.oCity.X[letter].push(match[1]);
}else if (reg26.test(letter)) {
if (!Vcity.oCity.Y[letter]) Vcity.oCity.Y[letter] = [];
Vcity.oCity.Y[letter].push(match[1]);
}else if (reg27.test(letter)) {
if (!Vcity.oCity.Z[letter]) Vcity.oCity.Z[letter] = [];
Vcity.oCity.Z[letter].push(match[1]);
}
/* 热门城市 */
if(!Vcity.oCity.hot['hot']) Vcity.oCity.hot['hot'] = hotStr;
}
//}
};
/* 城市HTML模板 */
/* 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>A</li>',
'<li>B</li>',
'<li>C</li>',
'<li>D</li>',
'<li>E</li>',
'<li>F</li>',
'<li>G</li>',
'<li>H</li>',
'<li>I</li>',
'<li>J</li>',
'<li>K</li>',
'<li>L</li>',
'<li>M</li>',
'<li>N</li>',
'<li>O</li>',
'<li>P</li>',
'<li>Q</li>',
'<li>R</li>',
'<li>S</li>',
'<li>T</li>',
'<li>U</li>',
'<li>V</li>',
'<li>W</li>',
'<li>x</li>',
'<li>y</li>',
'<li>Z</li>',
'</ul>'
];
/* 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,istr,hotStr) {
var input = options.input;
this.input = Vcity._m.$('#'+ input);
this.inputEvent(istr,hotStr);
},
/* *
* @createWarp
* 创建城市BOX HTML 框架
* */
createWarp:function(cwstr,hotStr){
var inputPos = Vcity._m.getPos(this.input);
var p = this.rootDiv = document.createElement('p');
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);
});
p.className = 'citySelector';
p.style.position = 'absolute';
p.style.left = inputPos.left + 'px';
p.style.top = inputPos.bottom + 'px';
p.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 childp = this.cityBox = document.createElement('p');
childp.className = 'cityBox';
childp.id = 'cityBox';
childp.innerHTML = Vcity._template.join('');
var hotCity = this.hotCity = document.createElement('p');
hotCity.className = 'hotCity';
childp.appendChild(hotCity);
p.appendChild(childp);
this.createHotCity(cwstr,hotStr);
},
/* *
* @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(chstr,hotStr){
adapterCity (chstr,hotStr);
var op,odl,odt,odd,odda=[],str,key,ckey,sortKey,regEx = Vcity.regEx,
oCity = Vcity.oCity;
for(key in oCity){
op = this[key] = document.createElement('p');
// 先设置全部隐藏hide
op.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 href="javascript:">' + oCity[key][sortKey[j]][i] + '</a>';
odda.push(str);
}
odd.innerHTML = odda.join('');
odl.appendChild(odt);
odl.appendChild(odd);
op.appendChild(odl);
}
// 移除热门城市的隐藏CSS
Vcity._m.removeClass('hide',this.hot);
this.hotCity.appendChild(op);
}
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.$('li',this.cityBox);
var ps = Vcity._m.$('p',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',ps[j]);
}
Vcity._m.addClass('on',this);
Vcity._m.removeClass('hide',ps[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(iestr,hotStr){
var that = this;
Vcity._m.on(this.input,'click',function(event){
event = event || window.event;
if(!that.cityBox){
that.createWarp(iestr,hotStr);
}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(iestr);
/* 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 (iestr) {
if(!iestr){
return;
}
//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 = [];
/* *
*【修改5】
* 这里原本是遍历Vcity.allCity，现在改用citylist
* zcx 2016-5-17
*/
for (var i = 0; i < iestr.length; i++) {
if (reg.test(iestr[i])) {
var match = Vcity.regEx.exec(iestr[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);
})
}
}
}更多Multi-city selector implementation code请关注PHP中文网（m.sbmmt.com）其它文章！
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
