1. [代码]新增选择城市
创新互联专注于企业成都营销网站建设、网站重做改版、绿春网站定制设计、自适应品牌网站建设、H5开发、商城网站建设、集团公司官网建设、成都外贸网站建设、高端网站制作、响应式网页设计等建站业务，价格优惠性价比高，为绿春等各大城市提供网站开发制作服务。
$(function(){
$("#province").cityCasCade("#city").cityCasCade('select','河南省');
//or
$("#province").cityCasCade("#city").cityCasCade('select','河南省','开封市');
}
/**
* java diqye
* 城市数据时从网上Copy的
* 级联功能也是参考网上已做好的思路
* 封装成插件为了以后使用方便
* add 增加选中城市方法select
*/
(function($){
$.fn.cityCasCade = function(operation,province,city){
var selectCity=null,params=null,overparams=null;
if(typeof operation == "string"){
if(operation == "select"){
if(province){
$(this).find("option").each(function(){
if($(this).val()==province){
this.selected=true;
$(this).change();
if(city){
$($.fn.cityCascadeParam.selectCity).find("option").each(function(){
if($(this).val()==city){
this.selected=true;
$(this).change();
}
});
}
}
});
}
return $(this);
}
selectCity=operation;
}
else{
if(operation.selector)selectCity=operation.selector;
if(operation.overideoperation.data)overparams=operation.data;
else params=operation.data;
}
$.fn.cityCascadeParam ={};
$.fn.cityCascadeParam.data = _provinces_;
$.fn.cityCascadeParam.selectCity = null;
if(selectCity) $.fn.cityCascadeParam.selectCity=selectCity;
else throw "城市选择器不能为空";
$.fn.cityCascadeParam.cityValue= $($.fn.cityCascadeParam.selectCity+":first").val();
$.fn.cityCascadeParam.cityText= $($.fn.cityCascadeParam.selectCity+":first").text();
if(overparams)$.fn.cityCascadeParam.data=overparams;
else $.extend($.fn.cityCascadeParam.data, params);
$.fn.cityCascadeParam.loadProvince = function(self){
for(var p in $.fn.cityCascadeParam.data){
var opt=document.createElement("option");
opt.innerHTML=p;
opt.value=p;
self.appendChild(opt);
}
}
$.fn.cityCascadeParam.loadCity = function(parent){
var self = $($.fn.cityCascadeParam.selectCity).get(0);
if(!self) throw "未找到城市下拉框 城市选择器 " + $.fn.cityCascadeParam.selectCity;
var selectProvince=$(parent).val();
if(selectProvince in $.fn.cityCascadeParam.data){
var citys=$.fn.cityCascadeParam.data[selectProvince];
self.innerHTML="";
for(var index=0;indexcitys.length;index++){
opt=document.createElement("option");
opt.innerHTML=citys[index];
opt.value=citys[index];
self.appendChild(opt);
}
}else{
self.innerHTML="";
opt=document.createElement("option");
opt.innerHTML=$.fn.cityCascadeParam.cityText;
opt.value=$.fn.cityCascadeParam.cityValue;
self.appendChild(opt);
}
}
this.each(function(){
$.fn.cityCascadeParam.loadProvince(this);
$(this).change(function(){
$.fn.cityCascadeParam.loadCity(this);
});
});
return $(this);
}
})($);
var _provinces_={四川省:["成都市","自贡市","攀枝花市","泸州市","德阳市","绵阳市","广元市","遂宁市","内江市","乐山市","南充市","眉山市","宜宾市","广安市","达州市","雅安市","巴中市","资阳市","阿坝藏族羌族自治州","甘孜藏族自治州","凉山彝族自治州"],山西省:["太原市","大同市","阳泉市","长治市","晋城市","朔州市","晋中市","运城市","忻州市","临汾市","吕梁市"],内蒙古:["呼和浩特市","包头市","乌海市","赤峰市","通辽市","鄂尔多斯市","呼伦贝尔市","巴彦淖尔市","乌兰察布市","兴安盟","锡林郭勒盟","阿拉善盟"],辽宁省:["沈阳市","大连市","鞍山市","抚顺市","本溪市","丹东市","锦州市","营口市","阜新市","辽阳市","盘锦市","铁岭市","朝阳市","葫芦岛市"],吉林省:["长春市","吉林市","四平市","辽源市","通化市","白山市","松原市","白城市","延边朝鲜族自治州"],黑龙江省:["哈尔滨市","齐齐哈尔市","鸡西市","鹤岗市","双鸭山市","大庆市","伊春市","佳木斯市","七台河市","牡丹江市","黑河市","绥化市","大兴安岭地区"],上海:["上海"],江苏省:["南京市","无锡市","徐州市","常州市","苏州市","南通市","连云港市","淮安市","盐城市","扬州市","镇江市","泰州市","宿迁市"],浙江省:["杭州市","宁波市","温州市","嘉兴市","湖州市","绍兴市","金华市","衢州市","舟山市","台州市","丽水市"],安徽省:["合肥市","芜湖市","蚌埠市","淮南市","马鞍山市","淮北市","铜陵市","安庆市","黄山市","滁州市","阜阳市","宿州市","巢湖市","六安市","亳州市","池州市","宣城市"],福建省:["福州市","厦门市","莆田市","三明市","泉州市","漳州市","南平市","龙岩市","宁德市"],江西省:["南昌市","景德镇市","萍乡市","九江市","新余市","鹰潭市","赣州市","吉安市","宜春市","抚州市","上饶市"],山东省:["济南市","青岛市","淄博市","枣庄市","东营市","烟台市","潍坊市","济宁市","泰安市","威海市","日照市","莱芜市","临沂市","德州市","聊城市","滨州市","菏泽市"],河南省:["郑州市","开封市","洛阳市","平顶山市","安阳市","鹤壁市","新乡市","焦作市","濮阳市","许昌市","漯河市","三门峡市","南阳市","商丘市","信阳市","周口市","驻马店市"],湖北省:["武汉市","黄石市","十堰市","宜昌市","襄樊市","鄂州市","荆门市","孝感市","荆州市","黄冈市","咸宁市","随州市","恩施土家族苗族自治州"],湖南省:["长沙市","株洲市","湘潭市","衡阳市","邵阳市","岳阳市","常德市","张家界市","益阳市","郴州市","永州市","怀化市","娄底市","湘西土家族苗族自治州"],广东省:["广州市","韶关市","深圳市","珠海市","汕头市","佛山市","江门市","湛江市","茂名市","肇庆市","惠州市","梅州市","汕尾市","河源市","阳江市","清远市","东莞市","中山市","潮州市","揭阳市","云浮市"],广西省:["南宁市","柳州市","桂林市","梧州市","北海市","防城港市","钦州市","贵港市","玉林市","百色市","贺州市","河池市","来宾市","崇左市"],海南省:["海口市","三亚市"],重庆市:["重庆"],贵州省:["贵阳市","六盘水市","遵义市","安顺市","铜仁地区","黔西南布依族苗族自治州","毕节地区","黔东南苗族侗族自治州","黔南布依族苗族自治州"],云南省:["昆明市","曲靖市","玉溪市","保山市","昭通市","丽江市","思茅市","临沧市","楚雄彝族自治州","红河哈尼族彝族自治州","文山壮族苗族自治州","西双版纳傣族自治州","大理白族自治州","德宏傣族景颇族自治州","怒江傈僳族自治州","迪庆藏族自治州"],西藏自治区:["拉萨市","昌都地区","山南地区","日喀则地区","那曲地区","阿里地区","林芝地区"],陕西省:["西安市","铜川市","宝鸡市","咸阳市","渭南市","延安市","汉中市","榆林市","安康市","商洛市"],甘肃省:["兰州市","嘉峪关市","金昌市","白银市","天水市","武威市","张掖市","平凉市","酒泉市","庆阳市","定西市","陇南市","临夏回族自治州","甘南藏族自治州"],青海省:["西宁市","海东地区","海北藏族自治州","黄南藏族自治州","海南藏族自治州","果洛藏族自治州","玉树藏族自治州","海西蒙古族藏族自治州"],宁夏自治区:["银川市","石嘴山市","吴忠市","固原市","中卫市"],新疆自治区:["乌鲁木齐市","克拉玛依市","吐鲁番地区","哈密地区","昌吉回族自治州","博尔塔拉蒙古自治州","巴音郭楞蒙古自治州","阿克苏地区","克孜勒苏柯尔克孜自治州","喀什地区","和田地区","伊犁哈萨克自治州","塔城地区","阿勒泰地区"],台湾省:["台北市"],香港特区:["香港"],澳门特区:["澳门"],河北省:["石家庄","唐山","秦皇岛","张家口","承德","廊坊","邯郸","邢台","保定","沧州","衡水"]};
jquery 插件就是一些人用jquery写的一些工具，常见的是jquery UI和jquery easyui,我们在调用时只需要用很少的代码就能实现很好的效果。
如easyui的datagrid、combobox、tree等可以实现表格、下拉框、树等形状及需要的操作。
附：easyui官网
可以在网站里面下载demo、观看一些特效、下载插件js等。
jQuery插件开发全解析 jQuery插件的开发包括两种：
一种是类级别的插件开发，即给jQuery添加新的全局函数，相当于给jQuery类本身添加方法。jQuery 的全局函数就是属于jQuery命名空间的函数。
另一种是对象级别的插件开发，即给jQuery对象添加方法。
HTML
首先在head中载入jquery库和cityselect插件。
script type="text/javascript" src="js/jquery.js"/script
script type="text/javascript" src="js/jquery.cityselect.js"/script
接下来，我们在#city中，放置三个select，并且三个select分别设置class属性为：prov、city、dist，分别表示省、市、区（县）三个下拉框。注意如果只想实现省市二级联动，则去掉第三个dist的select即可。
div id="city"
select class="prov"/select
select class="city" disabled="disabled"/select
select class="dist" disabled="disabled"/select
/div
jQuery
调用cityselect插件非常简单，直接调用：
$("#city").citySelect();
自定义参数调用，设置默认省市区。自定义参数调用，设置默认省市区。
$("#city").citySelect({
url:"js/city.min.js",
prov:"湖南", //省份
city:"长沙", //城市
dist:"岳麓区", //区县
nodata:"none" //当子集无数据时，隐藏select
});
当然，你还可以扩展，自定义下拉列表选项数据，你可以根据需要设置下拉内容，注意数据格式一定要为JSON格式。
$("#city").citySelect({
url:{"citylist":[
{"p":"前端技术","c":[{"n":"HTML"},{"n":"CSS","a":[{"s":"CSS2.0"},{"s":"CSS3.0"}]},
{"n":"JAVASCIPT"}]},
{"p":"编程语言","c":[{"n":"C"},{"n":"C++"},{"n":"PHP"},{"n":"JAVA"}]},
{"p":"数据库","c":[{"n":"Mysql"},{"n":"SqlServer"},{"n":"Oracle"}]},
]},
prov:"",
city:"",
dist:"",
nodata:"none"
});
你还可以利用PHP等后台语言将数据库中的数据转换成JSON格式，然后使用url参数指向后台地址也能实现无刷新联动效果。
$("#city").citySelect({
url:"data.php"
});
