我基本上是尝试将一个arraylist发送到JSP页面,并且页面中的if条件确定在下拉列表中设置为“selected”的值。
的Servlet
public class FeatureServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ArrayList<FeaturePermission> permList = new ArrayList<FeaturePermission>();
FeaturePermission perm = new FeaturePermission();
perm.setStatus("2");
permList.add(perm);
request.setAttribute("perms", permList);
RequestDispatcher rd = getServletContext().getRequestDispatcher("/CheckData.jsp");
rd.forward(request, response);
}
}
CheckData.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html>
<html lang="en">
<head>
<title>Test Page</title>
</head>
<body>
<select id="check_status" name="check_status">
<optgroup label="Choose Status">
<option value="1" <c:if test="${perms[0].status == 1}"> <c:out value="selected=selected"></c:out></c:if>>1</option>
<option value="2" <c:if test="${perms[0].status == 2}"> <c:out value="selected=selected"></c:out></c:if>>2</option>
</optgroup>
</select>
</body>
</html>
FeaturePermission类:
String ID = "";
String Status = "";
//Getter Setter & Constructors
我基本上需要检查参数'Status'中的值是否等于1,然后将所选选项设置为1,依此类推下拉列表中的所有选项。
但是,当我运行它时,未选择正确的值。我的代码是否正确?
答案 0 :(得分:1)
==
和eq
是相同的。但您必须将'1'
和'2'
放在'
标记内。像:
<option value="1" <c:if test="${perms[0].status == '1'}"> <c:out value="selected=selected"></c:out></c:if>>1</option>
<option value="2" <c:if test="${perms[0].status == '2'}"> <c:out value="selected=selected"></c:out></c:if>>2</option>
同时定义以status
开头的s
字段,而不是S
。