<%@ page contentType="text/html; charset=utf-8" %>
<html>
<head><title>Ajax</title>
<script language="javascript">
function change()
{
var flag = "notNull";
var hidd = document.getElementById("hidd");
hidd.value = flag;
alert(hidd.value);
}
</script>
</head>
<body>
<center>
<form action="p1.html" method="post">
<input type="button" id="button" onclick="change();" value="提交">
<input type="hidden" id="hidd" value="123" >
<script language="javascript">
document.write(document.getElementById("hidd").value + "-");
</script>
<%
String str = (String)request.getParameter("hidd");
out.println(str);
//if(str.equals("123"))
// out.println("哈哈");
//if(str.equals("notNull"));
// out.println("HelloWorld!");
%>
</form>
</center>
</body>
</html>写了个jsp页面，但好像在当前页面不能得到hidden的值，而我想通过对提交按钮的判断是否被点击，来执行jsp里面的代码，我该如何做呢？求code！ajax的也行，只要能实现功能！
<html>
<head><title>Ajax</title>
<script language="javascript">
function change()
{
var flag = "notNull";
var hidd = document.getElementById("hidd");
hidd.value = flag;
alert(hidd.value);
}
</script>
</head>
<body>
<center>
<form action="p1.html" method="post">
<input type="button" id="button" onclick="change();" value="提交">
<input type="hidden" id="hidd" value="123" >
<script language="javascript">
document.write(document.getElementById("hidd").value + "-");
</script>
<%
String str = (String)request.getParameter("hidd");
out.println(str);
//if(str.equals("123"))
// out.println("哈哈");
//if(str.equals("notNull"));
// out.println("HelloWorld!");
%>
</form>
</center>
</body>
</html>写了个jsp页面，但好像在当前页面不能得到hidden的值，而我想通过对提交按钮的判断是否被点击，来执行jsp里面的代码，我该如何做呢？求code！ajax的也行，只要能实现功能！
<html>
<head> <title>Ajax </title>
<script language="javascript">
function change()
{
var flag = "notNull";
var hidd = document.getElementById("hidd");
hidd.value = flag;
alert(hidd.value);
}
</script>
</head>
<body>
<center>
<form action="p1.jsp" method="post">
<input type="button" id="button" onclick="change();" value="提交">
<input type="hidden" id="hidd" value="123" >
</form>
<script language="javascript">
document.write(document.getElementById("hidd").value + "-");
</script>
<%
String str = (String)request.getParameter("hidd");
out.println(str);
//if(str.equals("123"))
// out.println("哈哈");
//if(str.equals("notNull"));
// out.println("HelloWorld!");
%>
</center>
</body>
</html>