JSP省市区三级联动下拉选

JSP+Jquery+Oracle实现省市区三级联动下拉选菜单

自己搞了一下午,刚开始觉得还有点麻烦,不过搞过一遍之后就觉得简单了,供大家互相学习,具体代码如下:

1.jsp页面代码：

</pre><pre name="code" class="html"><tr>
<td>所在地:</td>
<td>
<select class="select" id="province_code" name="province_code" onchange="getCity()">
<option value="">请选择</option>
</select>

<select class="select" id="city_code" name="city_code" onchange="getArea()">
<option value="">请选择</option>
</select>

<select class="select" id="area_code" name="area_code">
<option value="">请选择</option>
</select>
</td>
</tr>

2.js代码

<script type="text/javascript">
/*加载省下拉选*/
$(function () {
$.ajax({
type: "post",
url: "${ctx}/shop/area/getProvince",
success: function (data) {
for (var i = 0; i < data.length; i++) {
$('#province_code').append("<option value='" + data[i].id + "' >" + data[i].aName + "</option>");
}
},
error: function () {
alert("加载省失败");
}
});
});
/*加载市下拉选*/
function getCity() {
var id = $("#province_code").val();
$("#city_code").empty();
$("#area_code").empty();
$.ajax({
type: "post",
url: "${ctx}/shop/area/getCity",
data: {"id": id},
success: function (data) {
$('#city_code').append("<option value='' selected='selected' >" + '请选择' + "</option>");
$('#area_code').append("<option value='' selected='selected' >" + '请选择' + "</option>");
for (var i = 0; i < data.length; i++) {
$('#city_code').append("<option value='" + data[i].id + "' >" + data[i].aName + "</option>");
}
},
error: function () {
alert("加载市失败");
}
});
}
;
/*加载地区下拉选*/
function getArea() {
var id = $("#city_code").val();
$("#area_code").empty();
$.ajax({
type: "post",
url: "${ctx}/shop/area/getArea",
data: {"id": id},
success: function (data) {
$('#area_code').append("<option value='' selected='selected' >" + '请选择' + "</option>");
for (var i = 0; i < data.length; i++) {
$('#area_code').append("<option value='" + data[i].id + "' >" + data[i].aName + "</option>");
}
},
error: function () {
alert("加载区失败");
}
});
}3.dao层文件
public interface AreaDao {

List<Area> queryAreas(Integer pid);

Area queryAreasInfo(Integer id);

public List<Area> queryCity(Integer id);
}4.Area实体类
public class Area {
private Integer id;
private String aName;
private Integer pid;
private Integer status;
public Integer getId() {
return id;
}
public Integer getPid() {
return pid;
}
public Integer getStatus() {
return status;
}
public void setId(Integer id) {
this.id = id;
}
public void setPid(Integer pid) {
this.pid = pid;
}
public void setStatus(Integer status) {
this.status = status;
}

public String getaName() {
return aName;
}

public void setaName(String aName) {
this.aName = aName;
}

@Override
public String toString() {
return "Area [id=" + id + ", aName=" + aName + ", pid=" + pid
+ ", status=" + status + "]";
}

}5.Service层
@Service
@Transactional(readOnly = true)
public class AreasService {

@Resource
private AreaDao areasDao;

/**
* 通过pid查询Areas
*/

public List<Area> queryAreas(Integer pid) {

return this.areasDao.queryAreas(pid);
}

public Area queryArea(Integer id){
return this.areasDao.queryAreasInfo(id);
}

}6.Controller层
@RequestMapping("/shop/area")
@Controller
public class AreaController {
@Autowired
private AreasService areasService;

@RequestMapping(value="getProvince" ,method = RequestMethod.POST)
@ResponseBody
public List<Area> getProvince(){
List<Area> areas=areasService.queryAreas(0);
return areas;
}

@RequestMapping(value="getCity" ,method = RequestMethod.POST)
@ResponseBody
public List<Area> getCity(Integer id){
List<Area> areas=areasService.queryAreas(id);
return areas;
}
@RequestMapping(value="getArea" ,method = RequestMethod.POST)
@ResponseBody
public List<Area> getArea(Integer id){
List<Area> areas=areasService.queryAreas(id);
return areas;
}

}
7.Mapper.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.***.location.dao.AreaDao" >

<select id="queryAreas" resultType="Area" >
SELECT * FROM area WHERE pid=#{pid}
</select>

<select id="queryAreasInfo" resultType="Area" >
SELECT * FROM area WHERE id=#{id}
</select>

</mapper>

8.Oracle数据库结构
省市区在一个表 ，表名是AREA ，主键是ID ，省的PID=0 ， 市级的PID=省的ID，区级的PID=市级的ID

如：

ID                   ANAME         PID

100034          河南省           0

100101          郑州市         100034

100102         濮阳市          100034  

111111         中原区          100101

111112          金水区         100101

111113         高新区          100101