HiddenField控件
有时不用状态管理功能,可使用这个控件进行值的隐藏传递
学习事件OnValueChange用法
<asp:HiddenField ID="hdnServValue"runat="server"OnValueChanged="hdnServValue_ValueChanged"/>
protected void hdnServValue_ValueChanged(object sender, EventArgse)
{
lblMessage.Text ="The new Secret value"+hdnServValue.Value +".";
}
HTML按钮调用客户端方法（javascript代码块中） 改变隐藏控件的值
案例
UI设计视图
UI代码视图
<%@ PageLanguage="C#"AutoEventWireup="true"CodeFile="HiddenField.aspx.cs"Inherits="HiddenField"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>隐藏控件</title>
<script language="javascript" type="text/javascript">
// <!CDATA[
function Button1_onclick() {
var hdn =document.getElementById('hdnServValue');
var txt =document.getElementById('txtSecretValue');
hdn.value = txt.value;
}
// ]]>
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>
HiddenField Control</h1>
<asp:HiddenField ID="hdnServValue" runat="server" OnValueChanged="hdnServValue_ValueChanged" />
Enter secret value:
<asp:TextBox ID="txtSecretValue" runat="server"></asp:TextBox><br />
<br />
<input type="button" value="change secret value" id="Button1"onclick="returnButton1_onclick()" /><asp:Button
ID="btnPost" runat="server" Text="Post" />
<br />
<br />
<asp:Label ID="lblMessage" runat="server"></asp:Label></div>
</form>
</body>
</html>
UI运行时图