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HtmlTextArea.ServerChange Olay

Tanım

Denetimin içeriği sunucuya yapılan HtmlTextArea gönderiler arasında değiştiğinde gerçekleşir.

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

Olay Türü

Örnekler

Aşağıdaki kod örneği, olay için özel bir olay işleyicisinin ServerChange nasıl belirtileceğini ve oluşturulacağını gösterir. Denetime HtmlTextArea girilen değer 10 karakteri aştığında bir ileti görüntülenir.

<%@ 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">
<script runat="server">

  void Server_Change(Object sender, EventArgs e)
  {

    // The ServerChange event is commonly used for data validation.
    // This method determines whether the comment entered into the
    // HtmlTextArea control is longer than 20 characters.
    if (TextArea1.Value.Length > 20)
      Span1.InnerHtml = "Your comment cannot exceed 20 characters.";
    else
      Span1.InnerHtml = "You wrote: <br />" + TextArea1.Value;

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
   <title>HtmlTextArea ServerChange Example</title>
</head>
<body>

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

      <h3>HtmlTextArea ServerChange Example</h3>

      Enter your comments: <br />

      <textarea rows="2" cols="20" id="TextArea1"
                onserverchange="Server_Change" 
                runat="server"/>

      <br />

      <input type="submit"  
             value="Submit" 
             runat="server"/>

      <br />

      <span id="Span1" 
            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">
<script runat="server">

  Sub Server_Change(ByVal sender As Object, ByVal e As EventArgs)
         
    ' The ServerChange event is commonly used for data validation.
    ' This method determines whether the comment entered into the
    ' HtmlTextArea control is longer than 20 characters.
    If TextArea1.Value.Length > 20 Then
      Span1.InnerHtml = "Your comment cannot exceed 20 characters."
    Else
      Span1.InnerHtml = "You wrote: <br />" + TextArea1.Value
    End If
      
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
   <title>HtmlTextArea ServerChange Example</title>

</head>
<body>

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

      <h3>HtmlTextArea ServerChange Example</h3>

      Enter your comments: <br />

      <textarea rows="2" cols="20" id="TextArea1"
                onserverchange="Server_Change" 
                runat="server"/>

      <br />

      <input type="submit"  
             value="Submit" 
             runat="server"/>

      <br />

      <span id="Span1" 
            runat="server" />

   </form>

</body>
</html>
<%@ 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">
<script runat="server">

  void Server_Change(Object sender, EventArgs e)
  {
    // The ServerChange event is commonly used for data validation.
    // This method determines whether the comment entered into the
    // HtmlTextArea control is longer than 20 characters.
    if (TextArea1.Value.Length > 20)
    {
      Span1.InnerHtml = "Your comment cannot exceed 20 characters.";
    }
    else
    {
      Span1.InnerHtml = "You wrote: <br />" + TextArea1.Value;
    }

  }

  void Page_Load(Object sender, EventArgs e)
  {

    // Create an EventHandler delegate for the method you want to
    // handle the event, and then add it to the list of methods
    // called when the event is raised.
    TextArea1.ServerChange +=
      new System.EventHandler(this.Server_Change);

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
   <title>HtmlTextArea ServerChange Example</title>
</head>
<body>

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

      <h3>HtmlTextArea ServerChange Example</h3>

      Enter your comments (20 or fewer characters): <br />

      <textarea rows="2" cols="20" id="TextArea1"
                runat="server"/>

      <br />

      <input type="submit"  
             value="Submit" 
             runat="server"/>

      <br />

      <span id="Span1" 
            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">
<script runat="server">

  Sub Server_Change(ByVal sender As Object, ByVal e As EventArgs)
     
    ' The ServerChange event is commonly used for data validation.
    ' This method determines whether the comment entered into the
    ' HtmlTextArea control is longer than 20 characters.
    If TextArea1.Value.Length > 20 Then
         
      Span1.InnerHtml = "Your comment cannot exceed 20 characters."
         
    Else
         
      Span1.InnerHtml = "You wrote: <br />" + TextArea1.Value
         
    End If
      
  End Sub

  Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    ' Create an EventHandler delegate for the method you want to 
    ' handle the event, and then add it to the list of methods
    ' called when the event is raised.
    AddHandler TextArea1.ServerChange, AddressOf Server_Change

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
   <title>HtmlTextArea ServerChange Example</title>
</head>

<body>

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

      <h3>HtmlTextArea ServerChange Example</h3>

      Enter your comments (20 or fewer characters): <br />

      <textarea rows="2" cols="20" id="TextArea1"
                runat="server"/>

      <br />

      <input type="submit"  
             value="Submit" 
             runat="server"/>

      <br />

      <span id="Span1" 
            runat="server" />

   </form>

</body>
</html>

Açıklamalar

Denetimin ServerChange içeriği sunucuya yapılan gönderiler arasında değiştiğinde HtmlTextArea olay tetikler. Bu olay genellikle metin kutusunda veri doğrulama gerçekleştirmek için kullanılır.

Not

Bu olay yalnızca kullanıcı sunucuya bir gönderi başlattığında (örneğin, bir submit düğmeye tıklamak) tetikler. Bu olay, sunucuya bir gönderinin gerçekleşmesine neden olmaz.

Not

Olayın düzgün çalışması için denetimin ServerChange viewstate özelliği etkinleştirilmelidir.

Olayları işleme hakkında daha fazla bilgi için bkz. Olayları İşleme ve Oluşturma.

Şunlara uygulanır

Ayrıca bkz.