ASP.NET Tutorial/HTML Controls/Hidden

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Hidden field

   <source lang="csharp">

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default_aspx" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> 

   <title>HiddenField Control</title>

</head> <script language=javascript> 

 function ChangeHiddenValue()
 {
   alert("Entering ChangeHiddenValue");
   var hdnId = "<%=hdnSecretValue.ClientID%>"
   var hdn = document.getElementById(hdnId);
   var txt = document.getElementById("txtSecretValue");
   hdn.value = txt.value;
   alert("Value changed");
 }

</script> <body> 

   <form id="form1" runat="server">

HiddenField Control

This page was posted at <% =DateTime.Now.ToString() %>.

   <asp:HiddenField ID="hdnSecretValue" runat="server" OnValueChanged="hdnSecretValue_ValueChanged" />
     Enter secret value:
     <asp:TextBox ID="txtSecretValue" runat="server" />
     

   

   <input type=button value="Change hidden value" onclick="ChangeHiddenValue()" />
   <asp:Button ID="btnPost" runat="server" Text="Post" />
   

   

   <asp:Label ID="lblMessage" runat="server" Text=""/>

   </form>

</body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; 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 Default_aspx : System.Web.UI.Page { 

  protected void hdnSecretValue_ValueChanged(object sender, EventArgs e)
  {
    HiddenField hdn = (HiddenField)sender;
    lblMessage.Text = "The new value is " + hdn.Value + ".";
  }
}</source>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/HTML_Controls/Hidden&oldid=3275»