📄 simple_vote.jsp
字号:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>投票</title>
<!-- javaScript函数 validate()，用来验证是否选择了选项：-->
<script language="JavaScript">
<!--
function validate(){
var vote0 = document.form.vote[0].checked
||document.form.vote[1].checked
||document.form.vote[2].checked;
if(!vote0){
alert("请您选择！");
return false;
}
}
-->
</script>
</head>
<body>
<form action="SimpleVoteServlet" method="post" name="form"
onSubmit="javaScript: return validate();">
<table width="80%" border="0" align="center">
<tr>
<td valign="middle">你认为值得花时间去学习JSP技术吗？<br>
A.<input type="radio" value="A" name="vote">值得<br>
B.<input type="radio" value="B" name="vote">不值得<br>
C.<input type="radio" value="C" name="vote">不好说<br>
<%javax.servlet.http.Cookie cookies[] = request.getCookies();
boolean voted = false;
for (int i = 0; i < cookies.length; i++) {
if ((cookies[i].getName().equals("votedCookie"))
&& (cookies[i].getValue().equals("true"))) {
voted = true;
break;
}
}
%> <%if (!voted) {
%> <input type="submit" value="提交" name="submit"> <%} else {
%>
<font color="red">已经投过票了!</font> <%}
%>
<%if (session.getAttribute("voted") == null) {
%>
<input type="submit" value="提交" name="submit"> <%} else {
%> <font
color="red">已经投过票了!</font> <%}
%>
</td>
</tr>
<tr>
<td><a href="simple_showvote.jsp">查看投票结果</a></td>
</tr>
</table>
</form>
</body>
</html>
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