爲什麼我的第二個下拉菜單沒有被填充？

我正在使用JSP，STRUTS2，AJAX，jQuery和MySQL來填充依賴下拉列表。我想知道爲什麼我的第二個下拉列表沒有被填充？請讓我知道我在這裏失蹤。爲什麼我的第二個下拉菜單沒有被填充？

AjaxJsonAction.java

package com.action; 

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.util.ArrayList; 
import java.util.LinkedHashMap; 
import java.util.List; 
import java.util.Map; 

import org.json.JSONArray; 


import com.opensymphony.xwork2.Action; 
public class AjaxJsonAction implements Action{ 

    private Map<String, String> stateMap = new LinkedHashMap<String, String>(); 
    private String dummyMsg; 
    //Parameter for Jquery 
    private String countryName; 
    private String eventName; 
// 
// private Map<String, String> eventList = new LinkedHashMap<String, String>(); 
// private Map<String, String> eventDateList = new LinkedHashMap<String, String>(); 
    private ArrayList<Event> eventList; 
    private ArrayList<EventShow> eventShowList; 
    private Map<String, String> edList = new LinkedHashMap<String, String>(); 

    public Map<String, String> getStateMap() { 
     return stateMap; 
    } 

    public String getDummyMsg() { 
     return dummyMsg; 
    } 

    public String getCountryName() { 
     return countryName; 
    } 


    public void setStateMap(Map<String, String> stateMap) { 
     this.stateMap = stateMap; 
    } 

    public void setDummyMsg(String dummyMsg) { 
     this.dummyMsg = dummyMsg; 
    } 

    public void setCountryName(String countryName) { 
     this.countryName = countryName; 
    } 

// public Map<String, String> getEventList() { 
//  return eventList; 
// } 
// public void setEventList(Map<String, String> eventList) { 
//  this.eventList = eventList; 
// } 
// 
// public Map<String, String> getEventDateList() { 
//  return eventDateList; 
// } 
// public void setEventDateList(Map<String, String> eventDateList) { 
//  this.eventDateList = eventDateList; 
// } 
    public String getEventName() { 
     return eventName; 
    } 

    public void setEventName(String eventName) { 
     this.eventName = eventName; 
    } 
    public ArrayList<Event> getEventList() { 
     return eventList; 
    } 

    public void setEventList(ArrayList<Event> eventList) { 
     this.eventList = eventList; 
    } 

    public ArrayList<EventShow> getEventShowList() { 
     return eventShowList; 
    } 

    public void setEventShowList(ArrayList<EventShow> eventShowList) { 
     this.eventShowList = eventShowList; 
    } 

public Map<String, String> getedList() { 
    return edList; 
} 
public void setedList(Map<String, String> edList) { 
    this.edList = edList; 
} 


private List<EventShow> eventShows; 

public List<EventShow> getEventShows() { return eventShows; } 

    public String execute() { 

//  dummyMsg = "Ajax action Triggered"; 
//  return SUCCESS; 
     System.out.println("inside execute."); 
     populateEvent(); 
     System.out.println("eventList Count="+eventList.size()); 
//  populateShow(eventName); 
     return "success"; 
    } 

    public void populateEvent() { 
     System.out.println("inside populateEvent."); 
     Connection conn = null; 

      try { 
      String URL = "jdbc:mysql://localhost:3306/bookmyshow_dates"; 
      Class.forName("com.mysql.jdbc.Driver"); 
      conn = DriverManager.getConnection(URL, "dra2", "[email protected]"); 
      String sql = "SELECT DISTINCT * FROM EVENTS"; 
//   String sql ="SELECT * FROM user3333"; 
     PreparedStatement ps = conn.prepareStatement(sql); 

      ResultSet rs = ps.executeQuery(); 

      eventList = new ArrayList<Event>(); 
      while (rs.next()) { 
//    eventList.put(rs.getString("EventId"),rs.getString("EventName")); 
       eventList.add(new Event(rs.getInt("EventId"),rs.getString("EventName"))); 
      } 
      } catch (Exception e) { 
//   return "error"; 
      } 
      finally { 
      if (conn != null) { 
       try { 
        conn.close(); 
       } catch (Exception e) { 
       } 
      } 
      } 
      System.out.println("inside populateEvent End."); 

//  return "getEventList"; 
    } 

// public void populateShow(String eventName) { 
// public ArrayList<EventShow> populateShow() { 
// public Map<String, String> populateShow() { 
    public void populateShow() { 
     String eventId="1"; 
     System.out.println("parameter:"+eventId); 
     Connection conn = null; 

      try { 
      String URL = "jdbc:mysql://localhost:3306/bookmyshow_dates"; 
      Class.forName("com.mysql.jdbc.Driver"); 
      conn = DriverManager.getConnection(URL, "dra2", "[email protected]"); 


      String sql="SELECT ShowId,EventDate,\r\n" + 
        "CASE \r\n" + 
        " WHEN DATEDIFF(EventDate,NOW()) = 0 THEN CONCAT('Today',', ',DAY(EventDate),' ',MONTHNAME(EventDate))\r\n" + 
        " WHEN DATEDIFF(EventDate,NOW()) = 1 THEN CONCAT('Tomorrow',', ',DAY(EventDate),' ',MONTHNAME(EventDate))\r\n" + 
        " WHEN DATEDIFF(EventDate,NOW()) > 1 THEN CONCAT(DAYNAME(EventDate),', ',DAY(EventDate),' ',MONTHNAME(EventDate))\r\n" + 
        "END AS EventDay\r\n" + 
        ",es.EventId\r\n" + 
        "FROM EventShows es\r\n" + 
        "INNER JOIN EVENTS e ON es.EventId = e.EventId AND (EventDate>=NOW())\r\n" + 
        "WHERE e.EventId='"+eventId+" ';"; 
//   String sql ="SELECT * FROM user3333"; 
     PreparedStatement ps = conn.prepareStatement(sql); 

      ResultSet rs = ps.executeQuery(); 

      eventShowList = new ArrayList<EventShow>(); 
      while (rs.next()) { 
       eventShowList.add(new EventShow(rs.getInt("ShowId"),rs.getString("EventDay"),rs.getInt("EventId"))); 
//    eventDateList.put(rs.getString("EventId"), rs.getString("EventName")); 
       edList.put(rs.getString("EventId"), rs.getString("EventName")); 
      } 
      } catch (Exception e) { 
//   return "error"; 
      } 
      finally { 
      if (conn != null) { 
       try { 
        conn.close(); 
       } catch (Exception e) { 
       } 
      } 
      } 
System.out.println("eventShowList:"+eventShowList.size()); 
//  JSONArray jsArray = new JSONArray(eventShowList); 

     // Converts JSON string into a List of Product object 
//  List<EventShow> eventShows = ((List<EventShow>) eventShowList); 
//  return eventShowList; 
    } 

}

Event.java

package com.action; 

public class Event { 
    private int eventId; 

    private String eventName; 

    Event(int eventId, String eventName) 
    { 
     this.eventId = eventId; 
     this.eventName = eventName; 
    } 

    public int getEventId() { 
     return eventId; 
    } 
    public void setEventId(int eventId) { 
     this.eventId = eventId; 
    } 
    public String getEventName() { 
     return eventName; 
    } 
    public void setEventName(String eventName) { 
     this.eventName = eventName; 
    } 

}

EventShow.java

package com.action; 

public class EventShow { 

    private int showId; 
    private String eventDate; 
    private int eventId; 

    EventShow(int showId, String eventDate, int eventId) 
    { 
     this.showId = showId; 
     this.eventId = eventId; 
     this.eventDate = eventDate; 
    } 

    public int getshowId() { 
     return showId; 
    } 

    public void setShowId(int showId) { 
     this.showId = showId; 
    } 
    public String getEventDate() { 
     return eventDate; 
    } 

    public void setEventDate(String eventDate) { 
     this.eventDate = eventDate; 
    } 
    public int getEventId() { 
     return eventId; 
    } 
    public void setEventId(int eventId) { 
     this.eventId = eventId; 
    } 

}

struts.xml的

<?xml version="1.0" encoding="UTF-8" ?> 
<!DOCTYPE struts PUBLIC 
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 
"http://struts.apache.org/dtds/struts-2.0.dtd"> 
<struts> 
<package name="default" extends="json-default"> 

    <action name="getEvents" class="com.action.AjaxJsonAction" > 
     <result name="success">/index.jsp</result> 
     <result name="error">/error.jsp</result> 
    </action> 

    <action name="populateEventDate" class="com.action.AjaxJsonAction" method="populateShow"> 
<!--  <result type="json">/index.jsp</result> --> 
      <result name="success">/index.jsp</result> 
    </action> 

</package> 
</struts>

的web.xml

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> 
    <display-name>Struts2</display-name> 
    <filter> 
    <filter-name>struts2</filter-name> 
    <filter-class> 
      org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> 
    </filter> 
    <filter-mapping> 
    <filter-name>struts2</filter-name> 
    <url-pattern>/*</url-pattern> 
    </filter-mapping> 
    <welcome-file-list> 
    <welcome-file>index.jsp</welcome-file> 
    </welcome-file-list> 
</web-app>

的index.jsp

<%@ taglib prefix="s" uri="/struts-tags"%> 
<html> 
<head> 
<title>AJAX in Struts 2 using JSON and jQuery</title> 
<script src="js/jquery-1.8.2.js" type="text/javascript"></script> 
<script> 
$(document).ready(function() { 
    $('#country').change(function(event) { 
     var country = $("select#country").val(); 
     $.getJSON('ajaxAction', { 
      countryName : country 
     }, function(jsonResponse) { 
      $('#ajaxResponse').text(jsonResponse.dummyMsg); 
      var select = $('#states'); 
      select.find('option').remove(); 
      $.each(jsonResponse.stateMap, function(key, value) { 
       $('<option>').val(key).text(value).appendTo(select); 
      }); 
     }); 
    }); 

// $('#event').change(function(event) { 
//  var country = $("select#event").val(); 
// //  $.getJSON('<s:url action='populateEventDate'/>', { 
// $.getJSON('populateEventDate', { 
//   eventName : country 
//  }, function(jsonResponse) { 
//   $('#ajaxResponse').text(jsonResponse.dummyMsg); 
//   var select = $('#eventDate'); 
//   select.find('option').remove(); 
//   $.each(jsonResponse.eventDateList, function(key, value) { 
//    $('<option>').val(key).text(value).appendTo(select); 
//   }); 
//  }); 
// //  $.ajax({ 
// //    type: "POST", 
// //    url: "<s:url action='populateEventDate'/>", 
// //    data: {'eventName': country}, 
// //    contentType: "application/json; charset=utf-8", 
// //    dataType: "json", 
// //    success: function(msg) { 
// //     $("#eventDate").get(0).options.length = 0; 
// //     $("#eventDate").get(0).options[0] = new Option("Select event", "-1"); 

// //     $.each(msg.d, function(index, item) { 
// //      $("#eventDate").get(0).options[$("#eventDate").get(0).options.length] = new Option(item.Display, item.Value); 
// //     }); 
// //    }, 
// //    error: function(meg) { 
// //     $("#eventDate").get(0).options.length = 0; 
// //     alert("Failed to load events."+meg); 
// //    } 
// //   }); 
// }); 

$('#event').change(function(event) { 
     var eName = $("select#event").val(); 
//  $.getJSON('populateEventDate', { 
//   eventName : eName 
//  }, function(jsonResponse) { 
//   $('#ajaxResponse').text(jsonResponse.dummyMsg); 
//   var select = $('#eventDate'); 
//   select.find('option').remove(); 
//   $.each(jsonResponse.stateMap, function(key, value) { 
//    $('<option>').val(key).text(value).appendTo(select); 
//   }); 
//  }); 

     $.ajax({ 
      type:'POST', 
      dataType:'json', 
//   url:'populateEventDate?eventName='+eName, 
     url: "<s:url action='populateEventDate'/>", 
     data: {'eventName': eName}, 
//   dataType: "text", 
     contentType: "application/json; charset=utf-8", 

      success: function(jsonResponse) { 
       $('#ajaxResponse').text(jsonResponse.dummyMsg); 
       var select = $('#eventDate'); 
       select.find('option').remove(); 
       $.each(jsonResponse.eventDateList, function(key, value) { 
       $('<option>').val(key).text(value).appendTo(select); 
       }); 
           }, 
      error: function(jsonResponse) { 
       $("#eventDate").get(0).options.length = 0; 
       alert("Failed to load events."+jsonResponse); 
      } 
     }); 
    }); 
}); 
</script> 
</head> 
<body> 
    <h3>AJAX calls to Struts 2 using JSON and jQuery</h3> 

    <br /> 
    <br /> 
    <s:select name="event" id="event" list="eventList" listKey="eventId" 
      listValue="eventName" headerKey="0" headerValue="Event" 
      label="Select a event" /> 
    <br /> 
    <br /> 
    <s:select id="eventDate" name="eventDate" list="{'Select eventdate'}" 
     label="Select eventdate" /> 

</body> 
</html>

另外，我得到JSON響應作爲函數NULL： $('#event').change(function(event)。

來源

2014-06-18 vipin

您是否期待其中一個影響另一個的人口？並且都應該通過JSON動作填充？ – gcalex5

gcalex5 - 其相關的下拉菜單。而且這兩個都不應該通過JSON動作填充，只有應該通過JSON填充的子級下拉列表。 – vipin

我會推薦使用'sj：select'標籤，然後使用和onChangeTopics選項來讓另一個依賴另一個，然後給孩子一個和href標籤到你的json標籤。當然，如果你可以使用struts2 jquery插件和struts2 json插件。如果你想我可以給你和我的代碼摘錄 – gcalex5

您需要進行一些更正。

步驟1：在struts.xml文件

<action name="populateEventDate" class="com.action.AjaxJsonAction" method="populateShow"> 
    <result type="json">/index.jsp</result> 
</action>

步驟2：在AjaxJsonAction.java

public String populateShow() { 
    edList.put("1", "Monday");// Fill this map with your database values 
    return "success"; 
}

步驟3：在index.jsp - >使用jQuery JS從CDN和下面使用代碼

<script src="//code.jquery.com/jquery-1.11.0.min.js"></script> 
<script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script> 

<script type="text/javascript"> 
$(document).ready(function() { 
    $('#event').change(function(event) { 
     var event = $("select#event").val(); 

     $.getJSON('populateEventDate', { 
      eventName : event 
     }, function(jsonResponse) { 
      $('#ajaxResponse').text(jsonResponse.dummyMsg); 
      var select = $('select#eventDate'); 
      select.find('option').remove(); 
      $.each(jsonResponse.edList, function(key, value) { 
       $('<option>').val(key).text(value).appendTo(select); 
      }); 
     }); 
    }); 
}); 

</script>

如果您還有其他錯誤，請回復我。

來源

2014-06-24 07:10:11

感謝帕特的建議。不過，我從您的文章得到了主意，並有修改struts.xml中包括以下行動

<action name="getEvents" class="qBook.AjaxJsonAction" > 
     <result name="success">/index.jsp</result> 
    </action> 
    <action name="ajaxAction" class="qBook.AjaxJsonAction" method="TestABC"> 
     <result type="json">/index.jsp</result> 
    </action>

首先行動 - 獲得在網頁加載和第二動作第一個下拉數據得到第一的數據基於選擇的值在AJAX調用的幫助下下來。您的評論真的幫了我，再次'謝謝你'。

來源

2014-07-03 06:10:29 vipin

爲什麼我的第二個下拉菜單沒有被填充？

回答

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