HtmlInputCheckBox.ServerChange Event

Occurs when the Web page is submitted to the server and the HtmlInputCheckBox control changes state from the previous post.

Namespace: System.Web.UI.HtmlControls
Assembly: System.Web (in system.web.dll)

public event EventHandler ServerChange
/** @event */
public void add_ServerChange (EventHandler value)

/** @event */
public void remove_ServerChange (EventHandler value)

JScript supports the use of events, but not the declaration of new ones.

This event is raised when the Web page is submitted to the server and the HtmlInputCheckBox control changes state from the previous post.

NoteNote

The control must have view state enabled for the ServerChange event to work correctly.

For more information about handling events, see Consuming Events.

The following code example demonstrates how to specify and code a handler for the ServerChange event.

<%@ Page Language="C#" AutoEventWireup="True" %>

<html>
<head>

   <script language="C#" runat="server">

      void Button1_Click(object sender, EventArgs e) 
      { 

         if (Prev_Check_State.InnerHtml == Check1.Checked.ToString())
            Span2.InnerHtml = "CheckBox1 did not change state between clicks.";

         if (Check1.Checked == true)
         {          
            Span1.InnerHtml = "CheckBox1 is selected!";
            Prev_Check_State.InnerHtml="True";
         }         
         else
         { 
            Span1.InnerHtml = "CheckBox1 is not selected!";
            Prev_Check_State.InnerHtml="False";
         }
         
      }

      void Server_Changed(object sender, EventArgs e) 
      {
         Span2.InnerHtml = "CheckBox1 changed state between clicks.";
      }

   </script>

</head>

<body>

   <h3>HtmlInputCheckBox Sample</h3>

   <form runat=server>

      <input id="Check1" 
             type="checkbox"
             OnServerChange="Server_Changed" 
             runat="server"/> 
 
      CheckBox1 &nbsp;&nbsp;

      <span id="Span1" 
            style="color:red" 
            runat="server"/>

      <p>

      <input type="button" 
             id="Button1" 
             value="Enter" 
             OnServerClick="Button1_Click" 
             runat="server"/>
      
      <br><br>

      <span id="Span2" 
            runat="server"/>

      <htmlinputhidden id="Prev_Check_State"
                       Visible="false"
                       runat="server"/>

   </form>

</body>
</html>
   

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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