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Ajax实现省市区三级级联详解

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发表于 2020-6-4 16:30 | 显示全部楼层 |阅读模式
本文主要为大家详细介绍了Ajax实现省市区三级级联,数据来自mysql数据库,具有一定的参考价值,感兴趣的小伙伴们可以参考一下,希望能帮助到大家。

实现Ajax实现省市区三级级联,需要Java解析json技术
整体Demo下载地址如下: 点我下载

address.html


<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>

 <script type="text/javascript">

  /** 
   * 得到XMLHttpRequest对象 
   */
  function getajaxHttp() {
   var xmlHttp;
   try {
    // Firefox, Opera 8.0+, Safari 
    xmlHttp = new XMLHttpRequest();
   } catch (e) {
    // Internet Explorer 
    try {
     xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
     try {
      xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
     } catch (e) {
      alert("您的浏览器不支持AJAX!");
      return false;
     }
    }
   }
   return xmlHttp;
  }
  /** 
   * 发送ajax请求 
   * url--请求到服务器的URL 
   * methodtype(post/get) 
   * con (true(异步)|false(同步)) 
   * functionName(回调方法名,不需要引号,这里只有成功的时候才调用) 
   * (注意:这方法有二个参数,一个就是xmlhttp,一个就是要处理的对象) 
   */
  function ajaxrequest(url, methodtype, con, functionName) {
   //获取XMLHTTPRequest对象
   var xmlhttp = getajaxHttp();
   //设置回调函数(响应的时候调用的函数)
   xmlhttp.onreadystatechange = function() {
    //这个函数中的代码在什么时候被XMLHTTPRequest对象调用?
    //当服务器响应时,XMLHTTPRequest对象会自动调用该回调方法
    if (xmlhttp.readyState == 4) {
     if (xmlhttp.status == 200) {
      functionName(xmlhttp.responseText);
     }
    }
   };
   //创建请求
   xmlhttp.open(methodtype, url, con);
   //发送请求
   xmlhttp.send();
  }

  window.onload=function(){
   ajaxrequest("addressSerlvet?method=provincial","POST",true,addrResponse);
  }
  //动态获取省的信息
  function addrResponse(responseContents){
   var jsonObj = new Function("return" + responseContents)();
   for(var i = 0; i < jsonObj.addrList.length;i++){
    document.getElementById('select').innerHTML += 
     "<option value='"+jsonObj.addrList[i].id+"'>"
      +jsonObj.addrList[i].address+
     "</option>"
   }
  }
  //选中省后
  function pChange(){
   //先将市的之前的信息清除
   document.getElementById('selectCity').innerHTML="<option value='-1'>请选择市</option>";
   //再将区的信息清除
   document.getElementById('selectArea').innerHTML="<option value='-1'>请选择区</option>";
   //再将用户的输入清楚
   document.getElementById("addr").innerHTML="";
   var val = document.getElementById('select').value;
   if(val == -1){
    document.getElementById('selectCity')[0].selected = true;
    return;
   }
   //开始执行获取市
   ajaxrequest("addressSerlvet?method=city&provincial="+val,"POST",true,cityResponse);
  }
  //获取市的动态数据
  function cityResponse(responseContents){
   var jsonObj = new Function("return" + responseContents)();
   for(var i = 0; i < jsonObj.cityList.length;i++){
    document.getElementById('selectCity').innerHTML += 
     "<option value='"+jsonObj.cityList[i].id+"'>"
      +jsonObj.cityList[i].address+
     "</option>"
   }
  }
  //选中市以后
  function cChange(){
   var val = document.getElementById('selectCity').value;
   //开始执行获取区
   ajaxrequest("addressSerlvet?method=area&cityId="+val,"POST",true,areaResponse);
  }
  //获取区的动态数据
  function areaResponse(responseContents){
   var jsonObj = new Function("return" + responseContents)();
   for(var i = 0; i < jsonObj.areaList.length;i++){
    document.getElementById('selectArea').innerHTML += 
     "<option value='"+jsonObj.areaList[i].id+"'>"
      +jsonObj.areaList[i].address+
     "</option>"
   }
  }
  //点击提交按钮
  function confirM(){
   //获取省的文本值
   var p = document.getElementById("select");
   var pTex = p.options[p.options.selectedIndex].text;
   if(p.value=-1){
    alert("请选择省");
    return;
   }
   //获取市的文本值
   var city = document.getElementById("selectCity");
   var cityTex = city.options[city.options.selectedIndex].text;
   if(city.value=-1){
    alert("请选择市");
    return;
   }
   //获取区的文本值
   var area = document.getElementById("selectArea");
   var areaTex = area.options[area.options.selectedIndex].text;
   if(area.value=-1){
    alert("请选择区");
    return;
   }
   //获取具体位置id文本值
   var addr = document.getElementById("addr").value;
   //打印
   document.getElementById("show").innerHTML = "您选择的地址为 " + pTex + " " + cityTex + " " + areaTex + " " + addr;
  }

 </script>
<body>
 <select id="select" onchange="pChange()">
  <option value="-1">请选择省</option>
 </select>
 <select id="selectCity" onchange="cChange()">
  <option value='-1'>请选择市</option>
 </select>
 <select id="selectArea" onchange="aChange()">
  <option value='-1'>请选择市</option>
 </select>
 <input type="text" id="addr" />
 <button onclick="confirM();">确定</button>
 <p id="show"></p>
</body>
</html>

AddressServlet.java


package cn.bestchance.servlet;

import java.io.IOException;
import java.util.ArrayList;

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

import cn.bestchance.dao.AddressDao;
import cn.bestchance.dao.impl.AddressDaoImpl;
import cn.bestchance.entity.Address;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

@WebServlet("/addressSerlvet")
public class AddressSerlvet extends HttpServlet {
 private static final long serialVersionUID = 1L;
 private AddressDao dao = new AddressDaoImpl();

 protected void doGet(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {
  doPost(request, response);
 }

 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
  *  response)
  */
 protected void doPost(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {

  response.setCharacterEncoding("utf-8