想做一个根据下拉框中的选择个数,显示文本框的个数,但是总是有问题(偶是菜鸟,请大家多多关照)!
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<!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=utf-8">
<title>无标题文档</title>
</head>
<%!int bb;%>
<body>
<form action="" name="myform">
<table width="780" border="0" cellspacing="1" cellpadding="0">
<tr>
<td><div align="center"><span class="style2">Please choose the parameter of the period: Year of Period</span>
<input type="text" name="t" value="2009"/>
NO<select name="aa" onchange="myform.submit()">
<option value="" selected>please choose</option>
<option value=1>1</option>
<option value=2>2</option> </select>
</div></td>
</tr>
</table>
</form><%bb=request.getParameter("aa");%>
<%
for(int i=1;i<=bb;i++){%>
<%=i%>
<%
}
%>
</body>
</html>
谢谢啦!!
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<!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=utf-8">
<title>无标题文档</title>
</head>
<%!int bb;%>
<body>
<form action="" name="myform">
<table width="780" border="0" cellspacing="1" cellpadding="0">
<tr>
<td><div align="center"><span class="style2">Please choose the parameter of the period: Year of Period</span>
<input type="text" name="t" value="2009"/>
NO<select name="aa" onchange="myform.submit()">
<option value="" selected>please choose</option>
<option value=1>1</option>
<option value=2>2</option> </select>
</div></td>
</tr>
</table>
</form><%bb=request.getParameter("aa");%>
<%
for(int i=1;i<=bb;i++){%>
<%=i%>
<%
}
%>
</body>
</html>
谢谢啦!!
<!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=utf-8">
<title>无标题文档 </title>
</head>
<%int bb=0;%>
<body>
<form action="" name="myform">
<table width="780" border="0" cellspacing="1" cellpadding="0">
<tr>
<td> <div align="center"> <span class="style2">Please choose the parameter of the period: Year of Period </span>
<input type="text" name="t" value="2009"/>
NO <select name="aa" onchange="myform.submit()">
<option value="" selected>please choose </option>
<option value=1>1 </option>
<option value=2>2 </option> </select>
</div> </td>
</tr>
</table>
</form> <%
String cc = request.getParameter("aa");
if(cc!=null&&!cc.equals(""))
bb=Integer.valueOf(cc).intValue();System.out.println(bb);%> <%
for(int i=1;i <=bb;i++){%>
<input type="text" name="a<%=i%>">
<%
}
%>
</body>
</html>
bb=request.getParameter("aa");1)request.getParameter返回的是个string,bb是int型。必须要转换。
2)第一次进入画面时 request.getParameter("aa")是null。需要特殊处理
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