ajax+java+sql server2005 省、市、区联动[源码]

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ajax

ajax j2ee 省市联动

初学ajax之省市联动demo.
city.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>省市联动</title>
    <script type="text/javascript" src="js/city/city.js"></script>
  </head>
  <body>
    <h3>ajax+java 省、市、区联动</h3>
    <span style="color:red;">请选择你现居地:</span>
    <select id="province" onchange="loadCity();"></select>
    <select id="city" onchange="loadDistrict();"></select>
    <select id="district"></select>
  </body>
</html>

city.js:

window.onload = loadProvince;
var ajaxObject;
// 得到省
function loadProvince() {
	// 初始化
	setSelect("province", "null", "请选择省:");
	setSelect("city", "null", "请选择市:");
	setSelect("district", "null", "请选择区:");

	ajaxObject = getXMLHttpRequest();
	if (ajaxObject) {
		var openURL = document.URL + "city";
		var sendData = "type=getProvince";
		ajaxObject.open("POST", openURL, true);
		ajaxObject.setRequestHeader("Content-type",
				"application/x-www-form-urlencoded");
		ajaxObject.onreadystatechange = loadProvinceStatechange;
		ajaxObject.send(sendData);
	}
}
// 得到省回调函数
function loadProvinceStatechange() {
	if (ajaxObject.readyState == 4) {
		if (ajaxObject.status == 200) {
			var jsonStr = ajaxObject.responseText;
			var jsonObj = eval("(" + jsonStr + ")");
			for ( var i = 0; i < jsonObj.length - 1; i++) {
				var province = document.createElement("option");
				province.value = jsonObj[i].serialId;
				province.innerHTML = jsonObj[i].provinceName;
				$("province").appendChild(province);
			}
		}
	}
}
// 得到市
function loadCity() {
	if ($("province").value != "null") {
		ajaxObject = getXMLHttpRequest();
		if (ajaxObject) {
			var openURL = document.URL + "city";
			var province = $("province").value;
			var sendData = "type=loadCity&province=" + province;
			ajaxObject.open("POST", openURL, true);
			ajaxObject.setRequestHeader("Content-type",
					"application/x-www-form-urlencoded");
			ajaxObject.onreadystatechange = loadCityStatechange;
			ajaxObject.send(sendData);
		}
	} else {
		setSelect("city", "null", "请选择市:");
		setSelect("district", "null", "请选择区:");
	}
}
// 得到市回调函数
function loadCityStatechange() {
	if (ajaxObject.readyState == 4) {
		if (ajaxObject.status == 200) {
			var jsonStr = ajaxObject.responseText;
			var jsonObj = eval("(" + jsonStr + ")");
			setSelect("city", "null", "请选择市:");
			for ( var i = 0; i < jsonObj.length - 1; i++) {
				var city = document.createElement("option");
				city.value = jsonObj[i].serialId;
				city.innerHTML = jsonObj[i].cityName;
				$("city").appendChild(city);
			}
		}
	}
}
// 得到区 district
function loadDistrict() {
	if ($("city").value != "null") {
		ajaxObject = getXMLHttpRequest();
		if (ajaxObject) {
			var openURL = document.URL + "city";
			var city = $("city").value;
			var sendData = "type=loadDistrict&city=" + city;
			ajaxObject.open("POST", openURL, true);
			ajaxObject.setRequestHeader("Content-type",
					"application/x-www-form-urlencoded");
			ajaxObject.onreadystatechange = loadDistrictStatechange;
			ajaxObject.send(sendData);
		}
	} else {
		setSelect("district", "null", "请选择区:");
	}
}
// 得到区 callback function
function loadDistrictStatechange() {
	if (ajaxObject.readyState == 4) {
		if (ajaxObject.status == 200) {
			var jsonStr = ajaxObject.responseText;
			var jsonObj = eval("(" + jsonStr + ")");
			setSelect("district", "null", "请选择区:");
			for ( var i = 0; i < jsonObj.length - 1; i++) {
				var district = document.createElement("option");
				district.value = jsonObj[i].serialId;
				district.innerHTML = jsonObj[i].districtName;
				$("district").appendChild(district);
			}
		}
	}
}
// 得到 XMLHttpRequest对象
function getXMLHttpRequest() {
	var xmlHttp;
	try {
		xmlHttp = new XMLHttpRequest();
	} catch (e) {
		try {
			xmlHttp = new ActiveXObject("microsoft.XMLHTTP");
		} catch (e) {
			try {
				xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				window.alert("对不起,你的浏览器不支持ajax!");
				return false;
			}
		}
	}
	return xmlHttp;
}
// 初始化 select
function setSelect(s_id, s_value, s_innerHTML) {
	$(s_id).length = 0;
	var ele = document.createElement("option");
	ele.value = s_value;
	ele.innerHTML = s_innerHTML;
	$(s_id).appendChild(ele);
}
function $(id) {
	return document.getElementById(id);
}

City.java:

package com.city;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map.Entry;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class City extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		resp.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");
		String type = req.getParameter("type");
		String sql;
		String[] para;
		if ("getProvince".equals(type)) {
			// 得到省份
			sql = "select serialId,provinceName from fch_province";
			ArrayList<LinkedHashMap<String, Object>> provinces = (new SqlHelper())
					.sqlQuery(sql, null);
			String jsonProvinces = "";
			for (int i = 0; i < provinces.size(); i++) {
				HashMap<String, Object> hm = provinces.get(i);
				Iterator<String> iterator = hm.keySet().iterator();
				while (iterator.hasNext()) {
					String key = iterator.next();
					String value = hm.get(key).toString();
					// 编写 json
					if ("serialId".equals(key)) {
						jsonProvinces += "{\"" + key + "\":\"" + value + "\",";
					} else {
						jsonProvinces += "\"" + key + "\":\"" + value + "\"},";
					}
				}
			}
			jsonProvinces = "[" + jsonProvinces + "{\"none\":\"none\"}]";
			resp.getWriter().print(jsonProvinces);
			// System.out.println(jsonProvinces);
		} else if ("loadCity".equals(type)) {
			// 得到城市
			sql = "select serialId,cityName from fch_city where cityUpIdNum=?";
			para = new String[] { req.getParameter("province") };
			ArrayList<LinkedHashMap<String, Object>> cities = (new SqlHelper())
					.sqlQuery(sql, para);
			String jsonCities = "";
			// 遍历
			for (int i = 0; i < cities.size(); i++) {
				HashMap<String, Object> hm = cities.get(i);
				for (Entry<String, Object> city : hm.entrySet()) {
					// json String
					String key = city.getKey();
					String value = city.getValue().toString();
					if ("serialId".equals(key)) {
						jsonCities += "{\"" + key + "\":\"" + value + "\",";
					} else {
						jsonCities += "\"" + key + "\":\"" + value + "\"},";
					}
				}
			}
			jsonCities = "[" + jsonCities + "{\"none\":\"none\"}]";
			resp.getWriter().print(jsonCities);
			// System.out.println(jsonCities);
		} else if ("loadDistrict".equals(type)) {
			// 根据省的districtUpIdNum得到 serialId,districtName
			sql = "select serialId,districtName from fch_district where districtUpIdNum=?";
			para = new String[] { req.getParameter("city") };
			ArrayList<LinkedHashMap<String, Object>> districts = (new SqlHelper())
					.sqlQuery(sql, para);
			String jsonDistrict = "";
			for (int i = 0; i < districts.size(); i++) {
				HashMap<String, Object> hm = districts.get(i);
				for (Entry<String, Object> district : hm.entrySet()) {
					String key = district.getKey();
					String value = district.getValue().toString();
					if ("serialId".equals(key)) {
						jsonDistrict += "{\"" + key + "\":\"" + value + "\",";
					} else {
						jsonDistrict += "\"" + key + "\":\"" + value + "\"},";
					}
				}
			}
			jsonDistrict = "[" + jsonDistrict + "{\"none\":\"none\"}]";
			resp.getWriter().print(jsonDistrict);
			// System.out.println(jsonDistrict);
		}
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		this.doPost(req, resp);
	}
}

其他代码:详见源码..

效果图: