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HttpCapabilitiesBase.SupportsUncheck Propiedad

  • Referencia

Definición

Espacio de nombres:
System.Web.Configuration
Ensamblado:
System.Web.dll

Obtiene un valor que indica si la desactivación de un elemento <input type=checkbox> de HTML activado se refleja en los datos de postback.

public:
 virtual property bool SupportsUncheck { bool get(); };
public virtual bool SupportsUncheck { get; }
member this.SupportsUncheck : bool
Public Overridable ReadOnly Property SupportsUncheck As Boolean

Valor de propiedad

Boolean

Es true si la desactivación de un elemento <input type=checkbox> de HTML activado se refleja en los datos de postback; de lo contrario, es false. De manera predeterminada, es true.

Ejemplos

En el ejemplo de código siguiente se muestra cómo determinar si la desactivación de un elemento HTML <input type=checkbox> comprobado se refleja en los datos de postback.

<%@ page language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load(Object Sender, EventArgs e)
    {
        CheckBrowserCaps();
    }

    void CheckBrowserCaps()
    {
        String labelText = "";
        System.Web.HttpBrowserCapabilities myBrowserCaps = Request.Browser;
        if (((System.Web.Configuration.HttpCapabilitiesBase)myBrowserCaps).SupportsUncheck)
        {
            labelText = "Browser reflects the unchecking of a checked HTML CHECKBOX element in postback data.";
        }
        else
        {
            labelText = "Browser does not reflect the unchecking of a checked HTML CHECKBOX element in postback data.";
        }

        Label1.Text = labelText;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Browser Capabilities Sample</title>
</head>
<body>
    <form runat="server" id="form1">
        <div>
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />
        </div>
    </form>
</body>
</html>

<%@ page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
        CheckBrowserCaps()
    End Sub

    Function CheckBrowserCaps()

        Dim labelText As String = ""
        Dim myBrowserCaps As System.Web.HttpBrowserCapabilities = Request.Browser
        If (CType(myBrowserCaps, System.Web.Configuration.HttpCapabilitiesBase)).SupportsUncheck Then
            labelText = "Browser reflects the unchecking of a checked HTML CHECKBOX element in postback data."
        Else
            labelText = "Browser does not reflect the unchecking of a checked HTML CHECKBOX element in postback data."
        End If

        Label1.Text = labelText

    End Function 'CheckBrowserCaps
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Browser Capabilities Sample</title>
</head>
<body>
    <form runat="server" id="form1">
        <div>
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />
        </div>
    </form>
</body>
</html>

Comentarios

Si falsees , el valor del checked atributo de elementos HTML <input type=checkbox> se omite de los datos de postback.

Se aplica a