我的项目是StaffAllocation,我想从数据库中检索信息。我很新,这是我的第一个项目。我创建了一个staffnames从我的一张桌子中检索的下拉列表。现在,我想执行查询操作以staffnames从下拉列表中查看所选内容的详细信息。以下是我的编码,这是不正确的:
staffnames
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ page import="java.sql.*" %> <%@ page import="java.io.*" %> <%@ page import="java.lang.*" %> <%@ page import="javax.servlet.*" %> <%@ page import="javax.servlet.http.*" %> <%ResultSet resultset =null; %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Staff Details</title> </head> <BODY> <form method=post> <h3>Select Stafftype:</h3> <p><input type="radio" name="Stafftype" value="Male"> Male</input></p> <p><input type="radio" name="Stafftype" value="Female"> Female</input></p> <input type="submit" value="Submit"> </form> <% try{ Class.forName("com.mysql.jdbc.Driver"); Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/StaffAllocation? user=root&password=success"); Statement statement = connection.createStatement() ; String Stafftype= request.getParameter("Stafftype"); out.print(Stafftype); if(Stafftype.contentEquals("Male")){ resultset=statement.executeQuery("select * from tblstaffdetails where Stafftype= 'Male'"); } else if(Stafftype.contentEquals("Female")){ resultset=statement.executeQuery("select * from tblstaffdetails where Stafftype= 'Female'"); } else { System.out.println("your coding is wrong"); } %> <select> <% while(resultset.next()){ %> <option><%= resultset.getString(2)%></option> <%} %> <% String StaffName= request.getParameter("StaffName"); int staffId; String subcode; if(StaffName != null) { resultset=statement.executeQuery("SELECT a.staffId, a.StaffName, b.subcode FROM tblstaffdetails a LEFT JOIN tblsubhandled b ON a.staffId = b.staffId where StaffName='request.getParameter('StaffName')'"); } } catch(Exception e) { out.println("wrong entry"+e); } %> <form method = "get"> <br><br> <input name="Submit" type="button" value="Submit"> </form> </body> </html>`
表格:
tblstaffdetails-(1).staffId(2).StaffName(3).Stafftype(男性或女性)
tblsubhandled-(1).staffId(2).subcode
我整理了示例实现供您参考。您可以这样实现。您需要做的就是包括jQuery插件。示例代码就是这样,
$.ajax({ url : 'ur_servlet_url' + selValue, type : "POST", async : false, success : function(data) { //Sample data var data = "<select id='child'> <option value='11'>Value11</option></select>" $("#fillValue").html(data); } });
您需要编写类似于select标签的Java响应,并将其返回给您的ajax响应。最后,您可以像这样填充第二个下拉列表。让我知道是否有帮助。