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我有一个DisplayMessage.jsp页面，它打印存储在表中的数据。我需要更新数量变量的值并要求传递更改字段的值。 我想通过使用隐藏的输入字段来实现这一点，但我总是在servlet中获得一个空值。 我的JSP页面：下面隐藏输入字段总是为空
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="package1.GetConnection,java.sql.*" %>
<!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>Insert title here</title>
<script type="text/javascript">
function modify(button_id)
{
var text_val=document.getElementById('textbox'+button_id).value;
var dep_id=document.getElementById("dep"+button_id).value;
var machine_code=document.getElementById("machine"+button_id).value;
var mtlcode=document.getElementById("material"+button_id).value;
//alert("Text box value is "+text_val+"Department is "+dep_id+"Machine is"+machine_code+"Material code is "+mtlcode);
//$.post("UpdateValue.jsp",{'button_id':button_id});
}
</script>
</head>
<body>
<form id="displayEstimate" name="displayEstimate" action="UpdateData" method="post" enctype="multipart/form-data">
<input id="button_id" type="hidden" value="Hello"></input>
<%
GetConnection gc=new GetConnection();
Connection con=gc.getConnection();
PreparedStatement ps=con.prepareStatement("select dep,machine_code,mtlcode,qty,value,to_char(date_of_entry,'DD-MON-YYYY') from tbl_material_estimation");
ResultSet rs=ps.executeQuery();
int i=0;
out.print("<table style=\"border-style:solid\"; >");
out.print("<tr><td width=\"50\">Modify</td><td width=\"50\">Delete</td><td width=\"70\">Department</td><td width=\"100\">Machine Code</td><td width=\"100\">Material Code</td><td width=\"50\">Quantity</td><td width=\"50\">Value</td><td width=\"100\">Date of Entry</td></tr>");
while(rs.next())
{
out.print("<tr><td><button id=\""+i+"\" onclick=\"modify(id)\">Mod</button></td>");
out.print("<td><button id=\""+i+"\">Del</button></td>");
out.print("<td width=\"50\" align=\"center\">"+rs.getString(1)+"<input id=\"dep"+i+"\" type=\"hidden\" value=\""+rs.getString(1)+"\"></input></td>");
out.print("<td width=\"70\" align=\"center\">"+rs.getString(2)+"<input id=\"machine"+i+"\" type=\"hidden\" value=\""+rs.getString(2)+"\"></input></td>");
out.print("<td width=\"100\">"+rs.getString(3)+"<input id=\"material"+i+"\" type=\"hidden\" value=\""+rs.getString(3)+"\"></td>");
out.print("<td width=\"50\" align=\"center\"><input type=\"text\" id=\"textbox"+i+"\" value=\""+rs.getString(4)+"\"><input type=\"hidden\" id=\"hidden"+i+"\" value=\""+rs.getString(4)+"\"></td>");
out.print("<td width=\"50\" align=\"center\">"+rs.getString(5)+"</td>");
out.print("<td width=\"100\">"+rs.getString(6)+"</td></tr>");
i++;
}
out.print("</table>");
%>
</form>
</div>
</body>
</html>
我的servlet代码给出：
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UpdateData extends HttpServlet {
public UpdateData() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String id=request.getParameter("button_id");
System.out.println("Id is "+id);
}
}
我想打印一个简单的隐藏字段的值，但给了我太多空。有人能指出哪里出了问题吗？
Je sus christ，请在控制器中进行数据库调用，并将*传递给视图。 – christopher