ClientScriptManager.RegisterForEventValidation Metoda

Definicja

Rejestruje odwołanie do zdarzenia w celu weryfikacji.

Przeciążenia

RegisterForEventValidation(String, String)

Rejestruje odwołanie do zdarzenia do weryfikacji przy użyciu unikatowego identyfikatora kontrolki i argumentów zdarzeń reprezentujących kontrolkę klienta generującą zdarzenie.

RegisterForEventValidation(String)

Rejestruje odwołanie do zdarzenia do walidacji przy użyciu unikatowego identyfikatora kontrolki reprezentującego kontrolkę klienta generującą zdarzenie.

RegisterForEventValidation(PostBackOptions)

Rejestruje odwołanie do zdarzenia na potrzeby walidacji za pomocą polecenia PostBackOptions.

RegisterForEventValidation(String, String)

Rejestruje odwołanie do zdarzenia do weryfikacji przy użyciu unikatowego identyfikatora kontrolki i argumentów zdarzeń reprezentujących kontrolkę klienta generującą zdarzenie.

public:
 void RegisterForEventValidation(System::String ^ uniqueId, System::String ^ argument);
public void RegisterForEventValidation (string uniqueId, string argument);
member this.RegisterForEventValidation : string * string -> unit
Public Sub RegisterForEventValidation (uniqueId As String, argument As String)

Parametry

uniqueId
String

Unikatowy identyfikator reprezentujący kontrolkę klienta generującą zdarzenie.

argument
String

Argumenty zdarzeń przekazywane z zdarzeniem klienta.

Wyjątki

Metoda jest wywoływana przed Render(HtmlTextWriter) metodą .

Przykłady

Poniższy przykład kodu pokazuje użycie RegisterForEventValidation metody i ValidateEvent metody do zarejestrowania wywołania zwrotnego na potrzeby weryfikacji oraz sprawdzenia, czy wywołanie zwrotne pochodzi ze strony. Aby ulepszyć walidację pokazaną w przykładzie, można zmodyfikować parametr weryfikacji argument , aby zawierał informacje specyficzne dla użytkownika, takie jak tożsamość lub rola

<%@ Page Language="C#" %>
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server" >
        
    string _cbMessage = "";
    // Define method that processes the callbacks on server.
    public void RaiseCallbackEvent(String eventArgument)
    {
        try
        {
            Page.ClientScript.ValidateEvent(button1.UniqueID, this.ToString());
            _cbMessage = "Correct event raised callback.";
        }
        catch (Exception ex)
        {
            _cbMessage = "Incorrect event raised callback.";
        }
    }

    // Define method that returns callback result.
    public string GetCallbackResult()
    {
        return _cbMessage;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ClientScriptManager cs = Page.ClientScript;
            String cbReference = cs.GetCallbackEventReference("'" +
                Page.UniqueID + "'", "arg", "ReceiveServerData", "",
                "ProcessCallBackError", false);
            String callbackScript = "function CallTheServer(arg, context) {" +
                cbReference + "; }";
            cs.RegisterClientScriptBlock(this.GetType(), "CallTheServer",
                callbackScript, true);
        }
    }
    protected override void Render(HtmlTextWriter writer)
    {
        Page.ClientScript.RegisterForEventValidation(button1.UniqueID, this.ToString());
        base.Render(writer);
    }
    
</script>

<script type="text/javascript">
var value1 = new Date();
function ReceiveServerData(arg, context)
{
    Message.innerText = arg;
    Label1.innerText = "Callback completed at " + value1;
    value1 = new Date();
}
function ProcessCallBackError(arg, context)
{
    Message.innerText = 'An error has occurred.';
}
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>CallBack Event Validation Example</title>
</head>
<body>
    <form id="Form1" runat="server">
    <div>
      Callback result: <span id="Message"></span>
      <br /> <br />
      <input type="button"
             id="button1" 
             runat="server"
             value="ClientCallBack" 
             onclick="CallTheServer(value1, null )"/>
      <br /> <br />
      <asp:Label id="Label1" runat="server"/>
    </div>
    </form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Dim _cbMessage As String = ""
    ' Define method that processes the callbacks on server.
    Public Sub RaiseCallbackEvent(ByVal eventArgument As String) _
    Implements System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent
        
        Try
            Page.ClientScript.ValidateEvent(button1.UniqueID, Me.ToString())
            _cbMessage = "Correct event raised callback."
            
        Catch ex As Exception
            _cbMessage = "Incorrect event raised callback."

        End Try
        
    End Sub

    ' Define method that returns callback result.
    Public Function GetCallbackResult() _
    As String Implements _
    System.Web.UI.ICallbackEventHandler.GetCallbackResult

        Return _cbMessage
        
    End Function
    
    
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

        If (Not IsPostBack) Then
            Dim cs As ClientScriptManager = Page.ClientScript
            Dim cbReference As String = cs.GetCallbackEventReference("'" & _
                Page.UniqueID & "'", "arg", "ReceiveServerData", "", _
                "ProcessCallBackError", False)
            Dim callbackScript As String = "function CallTheServer(arg, context) {" & _
                cbReference & "; }"
            cs.RegisterClientScriptBlock(Me.GetType(), "CallTheServer", _
                callbackScript, True)
            
        End If
    End Sub
    
    Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
        
        Page.ClientScript.RegisterForEventValidation(button1.UniqueID, Me.ToString())
        MyBase.Render(writer)
    End Sub
    
</script>

<script type="text/javascript">
var value1 = new Date();
function ReceiveServerData(arg, context)
{
    Message.innerText = arg;
    Label1.innerText = "Callback completed at " + value1;
    value1 = new Date();
}
function ProcessCallBackError(arg, context)
{
    Message.innerText = 'An error has occurred.';
}
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>CallBack Event Validation Example</title>
</head>
<body>
    <form id="Form1" runat="server">
    <div>
      Callback result: <span id="Message"></span>
      <br /> <br />
      <input type="button"
             id="button1" 
             runat="server"
             value="ClientCallBack" 
             onclick="CallTheServer(value1, null )"/>
      <br /> <br />
      <asp:Label id="Label1" runat="server"/>
    </div>
    </form>
</body>
</html>

Poniższy przykład kodu przedstawia użycie RegisterForEventValidation metody do zarejestrowania wywołania zwrotnego w celu weryfikacji.

<%@ Page EnableEventValidation="true" Language="C#"  %>
<!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 id="Head1" runat="server">
    <title>Register an option for event validation</title>
    <script runat="server">
        protected override void Render(HtmlTextWriter writer)
        {
            ClientScript.RegisterForEventValidation("DropDownList1", "This is Option 1");
            ClientScript.RegisterForEventValidation("DropDownList1", "This is Option 2");
            ClientScript.RegisterForEventValidation("DropDownList1", "This is Option 3");
            // Uncomment the line below when you want to specifically register the option for event validation.
            // ClientScript.RegisterForEventValidation("DropDownList1", "Is this option registered for event validation?");
            base.Render(writer);
        }
    </script>
    <script type="text/javascript">
        function Initialize()
        {
            var oOption = document.createElement("OPTION");
            document.all("DropDownList1").options.add(oOption);
            oOption.innerText = "This is Option 1";            
            oOption = document.createElement("OPTION");            
            document.all("DropDownList1").options.add(oOption);
            oOption.innerText = "This is Option 2";
            oOption = document.createElement("OPTION");                
            document.all("DropDownList1").options.add(oOption); 
            oOption.innerText = "This is Option 3";
            oOption = document.createElement("OPTION");                
            document.all("DropDownList1").options.add(oOption); 
            oOption.innerText = "Is this option registered for event validation?";
        }
    </script>
</head>
<body onload="Initialize();">
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList>
        <asp:Button ID="Button1" runat="server" Text="Postback to server for validation" />
    </div>
    </form>
</body>
</html>
<%@ Page EnableEventValidation="true" Language="VB"  %>
<!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 id="Head1" runat="server">
    <title>Register an option for event validation</title>
    <script runat="server">
        Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
            ClientScript.RegisterForEventValidation("DropDownList1", "This is Option 1")
            ClientScript.RegisterForEventValidation("DropDownList1", "This is Option 2")
            ClientScript.RegisterForEventValidation("DropDownList1", "This is Option 3")
            ' Uncomment the line below when you want to specifically register the option for event validation.
            ' ClientScript.RegisterForEventValidation("DropDownList1", "Is this option registered for event validation?")
            MyBase.Render(writer)
        End Sub
    </script>
    <script type="text/javascript">
        function Initialize()
        {
            var oOption = document.createElement("OPTION");
            document.all("DropDownList1").options.add(oOption);
            oOption.innerText = "This is Option 1";            
            oOption = document.createElement("OPTION");            
            document.all("DropDownList1").options.add(oOption);
            oOption.innerText = "This is Option 2";
            oOption = document.createElement("OPTION");                
            document.all("DropDownList1").options.add(oOption); 
            oOption.innerText = "This is Option 3";
            oOption = document.createElement("OPTION");                
            document.all("DropDownList1").options.add(oOption); 
            oOption.innerText = "Is this option registered for event validation?";
        }
    </script>
</head>
<body onload="Initialize();">
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server">
        </asp:DropDownList>
        <asp:Button ID="Button1" runat="server" Text="Postback to server for validation" />
    </div>
    </form>
</body>
</html>

Zobacz też

Dotyczy

RegisterForEventValidation(String)

Rejestruje odwołanie do zdarzenia do walidacji przy użyciu unikatowego identyfikatora kontrolki reprezentującego kontrolkę klienta generującą zdarzenie.

public:
 void RegisterForEventValidation(System::String ^ uniqueId);
public void RegisterForEventValidation (string uniqueId);
member this.RegisterForEventValidation : string -> unit
Public Sub RegisterForEventValidation (uniqueId As String)

Parametry

uniqueId
String

Unikatowy identyfikator reprezentujący kontrolkę klienta generującą zdarzenie.

Przykłady

W poniższym przykładzie pokazano, jak używać RegisterForEventValidation metody i ValidateEvent metody w celu zarejestrowania wywołania zwrotnego na potrzeby walidacji oraz jak sprawdzić, czy wywołanie zwrotne pochodzi ze strony.

<%@ Page Language="C#" %>
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server" >
        
    string _cbMessage = "";
    // Define method that processes the callbacks on server.
    public void RaiseCallbackEvent(String eventArgument)
    {
        try
        {
            Page.ClientScript.ValidateEvent(button1.UniqueID);
            _cbMessage = "Correct event raised callback.";
        }
        catch (Exception ex)
        {
            _cbMessage = "Incorrect event raised callback.";
        }
    }

    // Define method that returns callback result.
    public string GetCallbackResult()
    {
        return _cbMessage;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ClientScriptManager cs = Page.ClientScript;
            String cbReference = cs.GetCallbackEventReference("'" +
                Page.UniqueID + "'", "arg", "ReceiveServerData", "",
                "ProcessCallBackError", false);
            String callbackScript = "function CallTheServer(arg, context) {" +
                cbReference + "; }";
            cs.RegisterClientScriptBlock(this.GetType(), "CallTheServer",
                callbackScript, true);
        }
    }
    protected override void Render(HtmlTextWriter writer)
    {
        Page.ClientScript.RegisterForEventValidation(button1.UniqueID);
        base.Render(writer);
    }
    
</script>

<script type="text/javascript">
    var value1 = new Date();
    function ReceiveServerData(arg, context) {
        Message.innerText = arg;
        Label1.innerText = "Callback completed at " + value1;
        value1 = new Date();
    }
    function ProcessCallBackError(arg, context) {
        Message.innerText = 'An error has occurred.';
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>CallBack Event Validation Example</title>
</head>
<body>
    <form id="Form1" runat="server">
    <div>
      Callback result: <span id="Message"></span>
      <br /> <br />
      <input type="button"
             id="button1" 
             runat="server"
             value="ClientCallBack" 
             onclick="CallTheServer(value1, null )"/>
      <br /> <br />
      <asp:Label id="Label1" runat="server"/>
    </div>
    </form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Dim _cbMessage As String = ""
    ' Define method that processes the callbacks on server.
    Public Sub RaiseCallbackEvent(ByVal eventArgument As String) _
    Implements System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent
        
        Try
            Page.ClientScript.ValidateEvent(button1.UniqueID)
            _cbMessage = "Correct event raised callback."
            
        Catch ex As Exception
            _cbMessage = "Incorrect event raised callback."

        End Try
        
    End Sub

    ' Define method that returns callback result.
    Public Function GetCallbackResult() _
    As String Implements _
    System.Web.UI.ICallbackEventHandler.GetCallbackResult

        Return _cbMessage
        
    End Function
    
    
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

        If (Not IsPostBack) Then
            Dim cs As ClientScriptManager = Page.ClientScript
            Dim cbReference As String = cs.GetCallbackEventReference("'" & _
                Page.UniqueID & "'", "arg", "ReceiveServerData", "", _
                "ProcessCallBackError", False)
            Dim callbackScript As String = "function CallTheServer(arg, context) {" & _
                cbReference & "; }"
            cs.RegisterClientScriptBlock(Me.GetType(), "CallTheServer", _
                callbackScript, True)
            
        End If
    End Sub
    
    Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
        
        Page.ClientScript.RegisterForEventValidation(button1.UniqueID)
        MyBase.Render(writer)
    End Sub
    
</script>

<script type="text/javascript">
var value1 = new Date();
function ReceiveServerData(arg, context)
{
    Message.innerText = arg;
    Label1.innerText = "Callback completed at " + value1;
    value1 = new Date();
}
function ProcessCallBackError(arg, context)
{
    Message.innerText = 'An error has occurred.';
}
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>CallBack Event Validation Example</title>
</head>
<body>
    <form id="Form1" runat="server">
    <div>
      Callback result: <span id="Message"></span>
      <br /> <br />
      <input type="button"
             id="button1" 
             runat="server"
             value="ClientCallBack" 
             onclick="CallTheServer(value1, null )"/>
      <br /> <br />
      <asp:Label id="Label1" runat="server"/>
    </div>
    </form>
</body>
</html>

Uwagi

Aby uzyskać więcej informacji i przykładów, zobacz metodę RegisterForEventValidation .

Zobacz też

Dotyczy

RegisterForEventValidation(PostBackOptions)

Rejestruje odwołanie do zdarzenia na potrzeby walidacji za pomocą polecenia PostBackOptions.

public:
 void RegisterForEventValidation(System::Web::UI::PostBackOptions ^ options);
public void RegisterForEventValidation (System.Web.UI.PostBackOptions options);
member this.RegisterForEventValidation : System.Web.UI.PostBackOptions -> unit
Public Sub RegisterForEventValidation (options As PostBackOptions)

Parametry

options
PostBackOptions

PostBackOptions Obiekt określający sposób generowania kodu JavaScript klienta w celu zainicjowania zdarzenia zwrotnego.

Uwagi

Aby uzyskać więcej informacji i przykładów, zobacz metodę RegisterForEventValidation .

Zobacz też

Dotyczy