为什么取不到值?????
aspx文件:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="demo.aspx.cs" Inherits="demo" %>
<!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> 无标题页 </title>
<script type="text/javascript">
document.getElementById("HiddenField1").value=document.documentElement.clientHeight;
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:HiddenField ID="HiddenField1" runat="server" />
<asp:Label ID="Label1" runat="server" Text="Label" Width="100%" style="background:#f00;"> </asp:Label>
</div>
</form>
</body>
</html>
cs文件:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class demo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if(HiddenField1.Value!="")
Label1.Height = Unit.Pixel(int.Parse(HiddenField1.Value));//为什么取不到值
}
}
为什么我得到HiddenField1.Value为空!