HtmlInputCheckBox.ServerChange Händelse

Definition

Namnområde:
System.Web.UI.HtmlControls
Sammansättning:
System.Web.dll

Inträffar när webbsidan skickas till servern och HtmlInputCheckBox kontrollen ändrar tillstånd från föregående inlägg.

public:
 event EventHandler ^ ServerChange;
public event EventHandler ServerChange;
member this.ServerChange : EventHandler 
Public Custom Event ServerChange As EventHandler

Händelsetyp

EventHandler

Exempel

I följande kodexempel visas hur du anger och kodar en hanterare för ServerChange händelsen.

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

<!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>
    <title>HtmlInputCheckBox Sample</title>
<script language="C#" runat="server">

      void Button1_Click(object sender, EventArgs e) 
      { 

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

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

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

   </script>

</head>

<body>

   <h3>HtmlInputCheckBox Sample</h3>

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

      <input id="Check1" 
             type="checkbox"
             onserverchange="Server_Changed" 
             runat="server"/> 
 
      CheckBox1   

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

      <br />

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

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

      <input type="hidden" id="Prev_Check_State"
                       visible="false"
                       runat="server"/>

   </form>

</body>
</html>

<%@ Page Language="VB" AutoEventWireup="True" %>

<!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>
    <title>HtmlInputCheckBox Sample</title>
<script language="VB" runat="server">

    Sub Button1_Click(sender As Object, e As EventArgs)
        
        If Prev_Check_State.Value = Check1.Checked.ToString() Then
            Span2.InnerHtml = "CheckBox1 did not change state between clicks."
        End If
        If Check1.Checked = True Then
            Span1.InnerHtml = "CheckBox1 is selected!"
            Prev_Check_State.Value = "True"
        Else
            Span1.InnerHtml = "CheckBox1 is not selected!"
            Prev_Check_State.Value = "False"
        End If
    End Sub 'Button1_Click
     

    Sub Server_Changed(sender As Object, e As EventArgs)
        Span2.InnerHtml = "CheckBox1 changed state between clicks."
    End Sub 'Server_Changed

  </script>

</head>

<body>

   <h3>HtmlInputCheckBox Sample</h3>

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

      <input id="Check1" 
             type="checkbox"
             onserverchange="Server_Changed" 
             runat="server"/> 
 
      CheckBox1   

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

      <br />

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

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

      <input type="hidden" id="Prev_Check_State"
                       visible="false"
                       runat="server"/>
   </form>

</body>
</html>

Kommentarer

Den här händelsen utlöses när webbsidan skickas till servern och HtmlInputCheckBox kontrollen ändrar tillstånd från föregående inlägg.

Note

Kontrollen måste ha visningstillstånd aktiverat för ServerChange att händelsen ska fungera korrekt.

Mer information om hur du hanterar händelser finns i Hantera och höja händelser.

Gäller för

Se även