[英]How can I get the selected radio button value on another jsp page?
這是第一頁。 我在提交處理頁面上遇到了單選按鈕值為 NULL 的問題。
<html>
<head>
<title>LoginForm</title>
</head>
<body >
<font size="20"><marquee behavior="alternate">Spice Digital</marquee></font>
<h1>Login Page</h1>
<h2>Signup Details</h2>
<form action="LoginCheck.jsp" method="post">
<br/>Username:<input type="text" name="username">
<br/>Password:<input type="password" name="password">
<br/>select your gender:
<select name=dropdown>
<option name=one value=one> Male </option>
<option name=two value=two> Female </option>
</select>
<br/>select your department:
<input type="radio" name=myradio value="1"/>MCA
<input type="radio" name=myradio value="2"/>B.Tech
<input type="radio" name=myradio value="3"/>Other
<br/> select your choices:
<input type="checkbox" name=mybox value="1"/>java
<input type="checkbox" name=mybox value="2"/>c++
<input type="checkbox" name=mybox value="3"/>c
<input type="checkbox" name=mybox value="4"/>sql
<br/>enter you comments here:
<textarea name=mytextarea cols=20 rows=5>
</textarea>
<br/><input type="submit" value="Login">
</form>
</body>
</html>
這是第 2 頁。 我無法在此處獲取所選值。 我使用request.getParameter()
錯了嗎?
<html>
<head>
<title>JSP Page</title>
</head>
<body BACKGROUND="C:\Documents and Settings\temp- 00940\workspace\login\WebContent\background.jpg">
<br/><br/><br/><br/><br/>
<form action="LoginForm.jsp" method="get">
<font size="20"><marquee>Spice Digital </marquee></font>
<h2>
<%
String a=session.getAttribute("username").toString();
out.println("Welcome "+a+"..!!");
%>
<br>
<%
String b=request.getParameter("myradio");
out.println("Your department is "+b);
%>
<br/>
<%
String c=request.getParameter("mybox");
out.println("Your choice is "+c);
%>
</h2>
<br/>
<a href="http://www.Google.com">Click here to google search</a>
<br/>
<br/><br/>
<br/><br/><br/>
<a href="Logout.jsp">LogOut</a>
</form>
</body>
</html>
<html>
<head>
<title>Example</title>
</head>
<body>
<form name="form-name" action="LoginCheck.jsp" method="post">
<input type="radio" name="myradio" value="1" checked="checked"/>MCA
<input type="radio" name="myradio" value="2"/>B.Tech
<input type="radio" name="myradio" value="3"/>Other
<input name="goto" type="submit" value="Login">
</form>
</body>
</html
獲取請求值:
<%@ page contentType="text/html; charset=iso-8859-1" language="java" %>
<%
String myRadio= request.getParameter("myradio");
%>
要確定選擇了哪個按鈕,請使用request.getParameter("myradio")
對於值處理:
if ("1".equals(myRadio)) {
// processing here
}
它在 eclipse 上對我來說很好用。 為簡單起見,稍微修改了代碼。
如果沒有將數據路由到其他頁面,那么在此您應該有您的數據應該顯示的 JSP 文件的名稱。
這是修改后的代碼。
索引.jsp
<html>
<head>
<title>LoginForm</title>
</head>
<body >
<font size="20"><marquee behavior="alternate">Spice Digital</marquee></font>
<h1>Login Page</h1>
<h2>Signup Details</h2>
<form action="new.jsp" method="post">
<br/>Username:<input type="text" name="username">
<br/>Password:<input type="password" name="password">
<br/>select your gender:
<select name=dropdown>
<option name=one value=one> Male </option>
<option name=two value=two> Female </option>
</select>
<br/>select your department:
<input type="radio" name=myradio value="1"/>MCA
<input type="radio" name=myradio value="2"/>B.Tech
<input type="radio" name=myradio value="3"/>Other
<br/> select your choices:
<input type="checkbox" name=mybox value="1"/>java
<input type="checkbox" name=mybox value="2"/>c++
<input type="checkbox" name=mybox value="3"/>c
<input type="checkbox" name=mybox value="4"/>sql
<br/>enter you comments here:
<textarea name=mytextarea cols=20 rows=5>
</textarea>
<br/><input type="submit" value="Login">
</form>
</body>
</html>
新建.jsp
<html>
<head>
<title>JSP Page</title>
</head>
<body BACKGROUND="C:\Documents and Settings\temp-00940\workspace\login\WebContent\background.jpg">
<br/><br/><br/><br/><br/>
<form action="LoginForm.jsp" method="get">
<font size="20"><marquee>Spice Digital </marquee></font>
<h2>
<%
// String a=session.getAttribute("username").toString();
// out.println("Welcome "+a+"..!!");
%>
<br>
<%
String b=request.getParameter("myradio");
out.println("Your department is "+b);
%>
<br/>
<%
String c=request.getParameter("mybox");
out.println("Your choice is "+c);
%>
</h2>
<br/>
<a href="http://www.Google.com">Click here to google search</a>
<br/>
<br/><br/>
<br/><br/><br/>
<a href="Logout.jsp">LogOut</a>
</form>
</body>
</html>
問題可能出在您的路由上,因為您首先將表單發送到 logincheck.jsp,然后再發送到您想要的 jsp。
我猜是因為您沒有在引號中指定 name 屬性的值,
名稱正在顯示,因為您將它放在引號內,
<br/>Username:<input type="text" name="username">
所以試試這個,
select your gender:
<select name="dropdown">
<option name="one" value="one> Male </option>
<option name="two" value="two"> Female </option>
</select>
<br/>select your department:
<input type="radio" name="myradio" value="1"/>MCA
<input type="radio" name="myradio" value="2"/>B.Tech
<input type="radio" name="myradio" value="3"/>Other
<br/> select your choices:
<input type="checkbox" name="mybox" value="1"/>java
<input type="checkbox" name="mybox"value="2"/>c++
<input type="checkbox" name="mybox"value="3"/>c
<input type="checkbox" name="mybox"value="4"/>sql
<br/>enter you comments here:
<textarea name="mytextarea" cols=20 rows=5>
</textarea>
希望能幫助到你 !!
我的回答可能對其他人有用:
我將用一個單選按鈕和下拉按鈕的例子來展示它,因為它們都用於從列表中選擇一個單一的響應:文件:index.jsp
<form action="./StudentServlet" method="post">
<div class="form-label-group">
<label for="studentCourses">Student Course Group</label>
<select id="studentCourses" name="studentCourses">
<%for (int i = 1; i <= 6; i++) {%>
<option value= "1ITF<%=i%>">1ITF<%=i%></option>
<%}%>
</select>
</div>
<div class="form-label-group">
<label for="studentPreference">Preference at the moment:</label>
<%String[] chosenArray = {"APP", "BIT", "EMDEV", "INFRA", "ANDR"};
for (int j = 0; j < chosenArray.length; j++) {%>
<p><input type="radio" name="studentPreference" value="<%=chosenArray[j]%>" id="<%=chosenArray[j]%>"/>
<label for="<%=chosenArray[j]%>"><%=chosenArray[j]%></label>
</p>
<%}%>
<input type="submit" name="studentFormSubmit" id="studentFormSubmit">
</div>
</form>
文件:StudentServlet.java
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String studentCourse = request.getParameter("studentCourses");
String studentPreference = request.getParameter("studentPreference");
Student coursePreference= new Student(studentCourse, studentPreference);
if (request.getParameter("studentFormSubmit") != null) {
request.setAttribute("coursePreference", coursePreference);
request.getRequestDispatcher("DisplayResult.jsp").forward(request, response);
}
}
在文件 DisplayResult.jsp 中
<h1>Course Details</h1>
<div>
<%
Student coursePreference= = (Student) request.getAttribute("coursePreference");
%>
<p>Student Course: <%=coursePreference.getStudentCourse()%></p>
<p>Student Preference: <%=coursePreference.getStudentPreference()%></p>
</div>
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