HtmlTextArea.ServerChange イベント
アセンブリ: System.Web (system.web.dll 内)

Public Event ServerChange As EventHandler
public event EventHandler ServerChange
public: event EventHandler^ ServerChange { void add (EventHandler^ value); void remove (EventHandler^ value); }
/** @event */ public void add_ServerChange (EventHandler value) /** @event */ public void remove_ServerChange (EventHandler value)

HtmlTextArea コントロールの内容がサーバーへのポスト間で変更された場合は ServerChange イベントが発生します。このイベントは通常、テキスト ボックスのデータ検証を実行するために使用されます。
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このイベントは、Submit ボタンのクリックなど、ユーザーがサーバーへのポストを開始したときにだけ発生します。このイベントによりサーバーへのポストが発生することはありません。 |

ServerChange イベントのカスタム イベント ハンドラを指定および作成する方法を次のコード例に示します。HtmlTextArea コントロールに入力された値が 10 文字を超えると、メッセージが表示されます。
<%@ Page Language="VB" AutoEventWireup="True" %> <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> <head> <title>HtmlTextArea ServerChange Example</title> </head> <body> <form runat="server"> <h3>HtmlTextArea ServerChange Example</h3> Enter your comments: <br> <textarea id="TextArea1" OnServerChange="Server_Change" runat="server"/> <br> <input type="submit" value="Submit" runat="server"/> <p> <span id="Span1" runat="server" /> </form> </body> </html>
<%@ Page Language="C#" AutoEventWireup="True" %> <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> <head> <title>HtmlTextArea ServerChange Example</title> </head> <body> <form runat="server"> <h3>HtmlTextArea ServerChange Example</h3> Enter your comments: <br> <textarea id="TextArea1" onserverchange="Server_Change" runat="server"/> <br> <input type="submit" value="Submit" runat="server"/> <p> <span id="Span1" runat="server" /> </form> </body> </html>
<%@ Page Language="JScript" AutoEventWireup="True" %> <script runat="server"> function Server_Change(sender, e : 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) Span1.InnerHtml = "Your comment cannot exceed 20 characters."; else Span1.InnerHtml = "You wrote: <br>" + TextArea1.Value; } </script> <html> <head> <title>HtmlTextArea ServerChange Example</title> </head> <body> <form runat="server"> <h3>HtmlTextArea ServerChange Example</h3> Enter your comments: <br> <textarea id="TextArea1" onserverchange="Server_Change" runat="server"/> <br> <input type="submit" value="Submit" runat="server"/> <p> <span id="Span1" runat="server" /> </form> </body> </html>
<%@ Page Language="VB" AutoEventWireup="True" %> <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> <head> <title>HtmlTextArea ServerChange Example</title> </head> <body> <form runat="server"> <h3>HtmlTextArea ServerChange Example</h3> Enter your comments (20 or fewer characters): <br> <textarea id="TextArea1" runat="server"/> <br> <input type="submit" value="Submit" runat="server"/> <p> <span id="Span1" runat="server" /> </form> </body> </html>
<%@ Page Language="C#" AutoEventWireup="True" %> <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> <head> <title>HtmlTextArea ServerChange Example</title> </head> <body> <form runat="server"> <h3>HtmlTextArea ServerChange Example</h3> Enter your comments (20 or fewer characters): <br> <textarea id="TextArea1" runat="server"/> <br> <input type="submit" value="Submit" runat="server"/> <p> <span id="Span1" 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
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