JQuery实现省市区三级联动

[中国地区列表.xml下载]

jquery版本：1.2.6，传说jquery1.3异步加载会出现卡的情况。

js内容：

var j = jQuery.noConflict();
var prov="";
var city="";
var area="";
j(function(){
    j.get("/Js/Message/address.xml",function(xml){
            j("body").data("xml",xml);
            j("#province_city_area").append("<select id='_province'></select>&nbsp;<select id='_city'></select><select id='_area'></select>");
            j("province",xml).each(function(){
                if(j(this).attr("province")==prov)
                    j("#_province").append("<option value="+j(this).attr("provinceID")+" selected>"+j(this).attr("province")+"</option>");
                else
                j("#_province").append("<option value="+j(this).attr("provinceID")+">"+j(this).attr("province")+"</option>");
            });//初始省

            LoadCity(j("#_province").val().substr(0,3),xml); //初始市 
            LoadArea(j("#_city").val().substr(0,4),xml); //初始区
            
            j("#_province").change(function(){
                j("#_city").empty();
                var Pvalue = j(this).val().substr(0,3);
                if(j("province[provinceID^="+Pvalue+"] City",xml).length==0){
                    j("#_city").hide();
                    j("#_area").remove();
                    return;
                }else
                    j("#_city").show();
                LoadCity(Pvalue,xml);
                LoadArea(j("#_city").val().substr(0,4),xml);
            });
            
            j("#_city").change(function(){
                LoadArea(j(this).val().substr(0,4),xml);
            });
        }
    ); 
    
    function LoadCity(Pvalue,xml){
        j("#_city").empty();
        j("province[provinceID^="+Pvalue+"] City",xml).each(function(){
            if(j(this).attr("City")==city)
                j("#_city").append("<option value="+j(this).attr("CityID")+" selected>"+j(this).attr("City")+"</option>");
            else
            j("#_city").append("<option value="+j(this).attr("CityID")+">"+j(this).attr("City")+"</option>");
        });
    } 
    
    function LoadArea(Cvalue,xml){
        j("#_area").remove();
        j("#_city").after("&nbsp;<select id=_area></select>");
        j("City[CityID^="+Cvalue+"] Piecearea",xml).each(function(){
            if(j(this).attr("Piecearea")==area)
                j("#_area").append("<option selected>"+j(this).attr("Piecearea")+"</option>");
            else
            j("#_area").append("<option>"+j(this).attr("Piecearea")+"</option>");
        });
    }             
});

j.extend({
    Jprov: function(provalue){
        if(provalue==null)
            return j("#_province option:selected").text();
        else{
            prov = provalue;
            j("#_province option").each(function(){
                if(j(this).text()==provalue){
                    j(this).attr("selected",true);
                    j("#_province").trigger("change");
                }
            });
        }    
    },
    Jcity: function(cityvalue){
        if(cityvalue==null)
            return j("#_city option:selected").text();
        else{
            city = cityvalue;
            j("#_city option").each(function(){
                if(j(this).text()==cityvalue){
                    j(this).attr("selected",true);
                    j("#_city").trigger("change");
                }
            });
        }
    },
    Jarea: function(areavalue){
        if(areavalue==null)
            return j("#_area option:selected").text();
        else{
            area = areavalue;
            j("#_area option").each(function(){
                if(j(this).text()==areavalue){
                    j(this).attr("selected",true);
                }
            });
        }
    }
});

html代码：

<div id="province_city_area"></div>

 调用：

取值：
j.Jprov();
j.Jcity();
j.Jarea();

赋值：
j.Jprov("广东省");
j.Jcity("深圳市");
j.Jarea("宝安区");