JQuery Ajax三级联动地区上拉框
JSP部分代码
<script src="/js/jquery-1.2.6.min.js" type="text/javascript"></script>
<script>
//为了避免jquery中的'$'与其它的'$'冲突,在此将jquery中的'$'重命名为'jQuery'
var jQuery=$;
</script>
<script>
//初始化数据
jQuery(document).ready(function(){
getProvince();
});
//取所有省份
function getProvince(){
//&callback=?"注意这个是为了解决跨域访问的问题
var url ="<%=request.getContextPath() %>/getAreaJSON?areaId=0&callback=?";
jQuery.getJSON(url,null,function call(result){
setProvince(result);
});
//显示或隐藏激活卡
jQuery("#actionCardChk").click(function(){
if(jQuery("#actionCardChk").attr("checked")==true){
jQuery("#actionCardDiv").show();
}else{
jQuery("#actionCardDiv").hide();
}
});
//显示或隐藏新增常用地址
jQuery("#addressChk").click(function(){
if(jQuery("#addressChk").attr("checked")==true){
jQuery("#addressDiv").show();
}else{
jQuery("#addressDiv").hide();
}
});
}
//设置省份
function setProvince(result){
var province = document.getElementById("toProvince");
jQuery.each(result.data, function(i, area){
var value = area.id;
var text = area.name;
var option = new Option(text,value);
province.options.add(option);
});
}
//按上级ID取子地区
function getArea(name){
if( name=='city' ){
clearSel(document.getElementById("toCity")); //清空城市
var province = document.getElementById("toProvince");
if(province.options[province.selectedIndex].value == "") return;
var areaId = province.options[province.selectedIndex].value;
var url ="<%=request.getContextPath() %>/getAreaJSON?areaId="+areaId+"&callback=?";
jQuery.getJSON(url,null,function call(result){
setCity(result);
});
}else if( name=='county'){
clearSel(document.getElementById("toCounty")); //清空城区
var city = document.getElementById("toCity");
if(city.options[city.selectedIndex].value == "") return;
var areaId = city.options[city.selectedIndex].value;
var url ="<%=request.getContextPath() %>/getAreaJSON?areaId="+areaId+"&callback=?";
jQuery.getJSON(url,null,function call(result){
setCounty(result);
});
}
}
//当改变省份时设置城市
function setCity(result){
var city = document.getElementById("toCity");
jQuery.each(result.data, function(i, area){
var value = area.id;
var text = area.name;
var option = new Option(text,value);
city.options.add(option);
});
}
//当改变省份时设置城市
function setCounty(result){
var county = document.getElementById("toCounty");
jQuery.each(result.data, function(i, area){
var value = area.id;
var text = area.name;
var option = new Option(text,value);
county.options.add(option);
});
}
// 清空下拉列表
function clearSel(oSelect){
while(oSelect.childNodes.length>0){
oSelect.removeChild(oSelect.childNodes[0]);
}
}
</script>
<tr>
<td height="28" colspan="3">
<select name="toProvince" id="toProvince" onChange="getArea('city')" class="STYLE5" onFocus="doOnFocus(this);">
<option value="" selected>请选择省份...</option>
</select>
</td>
</tr>
<tr>
<td height="28" colspan="3">
<select name="toCity" id="toCity" class="board" onChange="getArea('county')" onFocus="doOnFocus(this);">
<option value="">请选择城市...</option>
</select>
</td>
</tr>
<tr>
<td class="STYLE3">
<select name="toCounty" id="toCounty" class="board" onfocus="doOnFocus(this);">
<option value="">请选择城区...</option>
</select>
</td>
</tr>
JAVA部分代码 Servlet
response.setContentType("text/xml;charset=utf-8");
response.setHeader("Pragma","No-cache");
response.setDateHeader("Expires",0);
response.setHeader("Cache-Control","no-cache");
PrintWriter out=response.getWriter();
String areaId = request.getParameter("areaId");
if(areaId==null || areaId.trim().length()<=0){
//sb.append("<data><error>系统错误地区id为空</error></data>");
//out.print(sb.toString());
return;
}
//注意这个是为了解决跨域访问的问题
String callback = request.getParameter("callback");
try {
List areaList = AreaService.getInstance().getAreasByParentId(Integer.parseInt(areaId));
// 取集合
JSONArray jsonArray = JSONArray.fromObject(areaList);
JSONObject jsobjcet = new JSONObject();
jsobjcet.put("data", jsonArray);
response.getWriter().write(callback+"("+jsobjcet.toString()+");");
log.info(callback+"("+jsobjcet.toString()+");");
} catch (IOException e) {
e.printStackTrace();
}
DAO部分代码
public List getAreasByParentId(int parentId) {
Connection conn=null;
Statement stm=null;
ResultSet rs=null;
List<AreaInfo> list = new ArrayList<AreaInfo>();
try{
conn = ConnectionPool.getConnection();
if( conn == null ) throw new Exception("DataBase connection error");
stm = conn.createStatement();
String sql ="select * from n_area where parent_id =" + parentId;
rs = stm.executeQuery(sql);
AreaInfo areaInfo = null;
while( rs.next() ) {
areaInfo= new AreaInfo();
areaInfo.setId(rs.getInt("id"));
areaInfo.setName(rs.getString("name"));
areaInfo.setParentId(rs.getInt("parent_id"));
list.add(areaInfo);
}
}catch(Exception e){
log.error("getAreasByParentId() error:"+e.getMessage());
}finally{
ConnectionPool.release(conn,stm,rs); //释放资源
}
return list;
}
数据表结构
CREATE TABLE n_area (
id int(11) NOT NULL,
name varchar(20) ,
parent_id int(11),
)
记录
INSERT INTO n_area VALUES ('180', '内蒙古', '0');
INSERT INTO n_area VALUES ('181', '呼和浩特', '180');
INSERT INTO n_area VALUES ('182', '吉林省', '0');
INSERT INTO n_area VALUES ('183', '*省', '0');
INSERT INTO n_area VALUES ('184', '*', '183');
INSERT INTO n_area VALUES ('185', '吉林市', '182');
INSERT INTO n_area VALUES ('215', '其他地区', '213');
INSERT INTO n_area VALUES ('187', '其他地区', '1');
INSERT INTO n_area VALUES ('188', '其他地区', '30');
INSERT INTO n_area VALUES ('189', '其他地区', '31');
INSERT INTO n_area VALUES ('190', '其他地区', '32');
INSERT INTO n_area VALUES ('191', '其他地区', '33');
INSERT INTO n_area VALUES ('192', '其他地区', '34');
INSERT INTO n_area VALUES ('193', '其他地区', '35');
INSERT INTO n_area VALUES ('194', '其他地区', '36');
INSERT INTO n_area VALUES ('195', '其他地区', '37');
INSERT INTO n_area VALUES ('196', '其他地区', '38');
INSERT INTO n_area VALUES ('197', '其他地区', '39');
INSERT INTO n_area VALUES ('198', '其他地区', '40');
INSERT INTO n_area VALUES ('199', '其他地区', '41');
INSERT INTO n_area VALUES ('200', '其他地区', '42');
INSERT INTO n_area VALUES ('201', '其他地区', '43');
INSERT INTO n_area VALUES ('202', '其他地区', '44');
INSERT INTO n_area VALUES ('203', '其他地区', '94');
INSERT INTO n_area VALUES ('204', '其他地区', '136');
INSERT INTO n_area VALUES ('205', '其他地区', '178');
INSERT INTO n_area VALUES ('206', '其他地区', '180');
INSERT INTO n_area VALUES ('207', '其他地区', '182');
INSERT INTO n_area VALUES ('214', '拉萨', '213');
INSERT INTO n_area VALUES ('210', '其他地区', '45');
INSERT INTO n_area VALUES ('211', '其他地区', '46');
INSERT INTO n_area VALUES ('212', '其他地区', '86');
INSERT INTO n_area VALUES ('220', '新三区', '184');
INSERT INTO n_area VALUES ('219', '新二区', '184');
INSERT INTO n_area VALUES ('221', '天河区', '4');
INSERT INTO n_area VALUES ('222', '越秀区', '4');
INSERT INTO n_area VALUES ('223', '海珠区', '4');
附件中有相应的jar包
json-lib-2.1-jdk15.jar 是主要的