Exemple de code de menu déroulant en cascade de province et de ville Java-javaDidacticiel-php.cn

Exemple de code de menu déroulant en cascade de province et de ville Java

高洛峰

Libérer： 2017-01-17 11:28:42

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1844 Les gens l'ont consulté

L'exemple de cet article partage le code spécifique de la province Java et de la cascade de villes pour votre référence. Le contenu spécifique est le suivant

1.LoadAreaServlet.java

package com.scce.servlet;
  
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
  
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
  
import net.sf.json.JSONArray;
  
import com.scce.pojo.City;
import com.scce.pojo.Prov;
  
public class LoadAreaServlet extends HttpServlet {
  
    
    
  private static final long serialVersionUID = 1L;
  
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
      this.doPost(request, response);
  }
  
    
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html;charset=utf-8");
    request.setCharacterEncoding("utf-8");
    PrintWriter out = response.getWriter();
    ArrayList<Prov> provs = new ArrayList<Prov>();
    String provinceID = request.getParameter("provinceID");
    if (provinceID=="" || provinceID==null) {
      System.out.println("加载地级市信息");
    Prov pro1 = new Prov();
    pro1.setId(0);
    pro1.setProvinceName("湖北");
    Prov pro2 = new Prov();
    pro2.setId(1);
    pro2.setProvinceName("湖南");
    Prov pro3 = new Prov();
    pro3.setId(2);
    pro3.setProvinceName("广东");
    Prov pro4 = new Prov();
    pro4.setId(3);
    pro4.setProvinceName("广西");
    provs.add(pro1);
    provs.add(pro2);
    provs.add(pro3);
    provs.add(pro4);
    System.out.println(JSONArray.fromObject(provs).toString()); //[{"id":0,"provinceName":"湖北"},{}]
    out.print(JSONArray.fromObject(provs).toString());
    }else{
      ArrayList<City> citys = new ArrayList<City>();
      if (provinceID.equals("0")) {
        City city1 = new City();
        city1.setId(0);
        city1.setCityName("武汉市");
        City city2 = new City();
        city2.setId(1);
        city2.setCityName("黄石市");
        City city3 = new City();
        city3.setId(2);
        city3.setCityName("十堰市");
        citys.add(city1);
        citys.add(city2);
        citys.add(city3);
      }
      if (provinceID.equals("1")) {
        City city1 = new City();
        city1.setId(0);
        city1.setCityName("长沙市");
        City city2 = new City();
        city2.setId(1);
        city2.setCityName("岳阳市");
        City city3 = new City();
        city3.setId(2);
        city3.setCityName("湘潭市");
        citys.add(city1);
        citys.add(city2);
        citys.add(city3);
      }
      System.out.println(JSONArray.fromObject(citys).toString());
      out.print(JSONArray.fromObject(citys).toString());
    }  
  }
    
  
}

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2. test1.html

<!DOCTYPE html>
<html>
 <head>
  <title>chapter4-test1</title>
    
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="this is my page">
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    
   
  
 <link rel="stylesheet" href="../UI/themes/icon.css" type="text/css"></link>
   
 <link rel="stylesheet" href="../UI/themes/default/easyui.css" type="text/css"></link>
   
 <!-- <script type="text/javascript" src="../js/jquery-1.8.2.min.js"></script> -->
 <script type="text/javascript" src="../UI/jquery.min.js"></script>
 <script type="text/javascript" src="../UI/jquery.easyui.min.js"></script>
   
 <script type="text/javascript" src="../UI/locale/easyui-lang-zh_CN.js"></script>
 <script type="text/javascript">
 //LoadAreaServlet
  /* var dataCombobox=[{"id":1,"provinceName":"湖北省"}, 
    {"id":2,"provinceName":"湖南省","selected":true},
    {"id":3,"provinceName":"河北省"},
    {"id":4,"provinceName":"河南省"}
  ]; */
 $(function () {
       $("#province").combobox({
         width: 150,
         valueField: &#39;id&#39;, //1
         textField: &#39;provinceName&#39;, // 湖北省              
         editable: false,
        // data:dataCombobox //指定下拉列表的数据源
        url:&#39;../LoadAreaServlet&#39;,
        method:&#39;post&#39;,
        onLoadSuccess:function(data){
            
          var provId = $("#province").combobox("getValue");
            
          loadCity(provId);
        },
        onSelect:function(recode){
          loadCity(recode.id);
        }
          
       });
     });
  
     function loadCity(provId){
       $("#city").combobox({
         width: 150,
         valueField: &#39;id&#39;, //1
         textField: &#39;cityName&#39;, // 湖北省              
         editable: false,
        // data:dataCombobox //指定下拉列表的数据源
        url:&#39;../LoadAreaServlet?provinceID=&#39;+provId,
        method:&#39;post&#39;
       });
     }
   
 </script>
 </head>
   
 <body> 
  省：
  <select id="province" >
     <option value="0">数据加载中..</option>
         
  </select>
  <br/>
    
  市：
  <select id="city" >
     <option value="">数据加载中..</option>
  </select>
   
   
 </body>
</html>

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Ce qui précède représente l'intégralité du contenu de cet article. J'espère qu'il sera utile à tout le monde dans l'apprentissage de la programmation Java.

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