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MobilePage.ActiveForm Property

  • Reference

Definition

Namespace:
System.Web.UI.MobileControls
Assembly:
System.Web.Mobile.dll

Gets or sets the page's currently active form. This API is obsolete. For information about how to develop ASP.NET mobile applications, see Mobile Apps & Sites with ASP.NET.

public:
 property System::Web::UI::MobileControls::Form ^ ActiveForm { System::Web::UI::MobileControls::Form ^ get(); void set(System::Web::UI::MobileControls::Form ^ value); };
[System.ComponentModel.Bindable(false)]
[System.ComponentModel.Browsable(false)]
public System.Web.UI.MobileControls.Form ActiveForm { get; set; }
[<System.ComponentModel.Bindable(false)>]
[<System.ComponentModel.Browsable(false)>]
member this.ActiveForm : System.Web.UI.MobileControls.Form with get, set
Public Property ActiveForm As Form

Property Value

Form

The page's currently active form.

Attributes
BindableAttribute BrowsableAttribute

Exceptions

Exception

The page does not contain any forms.

Examples

The following example demonstrates how to use the ActiveForm property of a Form control. If the current mobile device allows for access keys for controls, the button will display the access key that submits the form.

Note

The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information, see ASP.NET Web Forms Page Code Model.

<%@ Page Language="C#" 
    Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile" 
    Namespace="System.Web.UI.MobileControls" 
    Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.Mobile" %>

<script runat="server">
    // <Snippet2>
    private void Command_OnClick(object sender, EventArgs e)
    {
        // Display the other form
        if (ActiveForm.ID == "Form1")
            ActiveForm = Form2;
        else
            ActiveForm = Form1;
    }
    // </Snippet2>

    public bool isAccessKey(MobileCapabilities caps, 
        string optValue)
    {
        // Determine if the browser is not a Web crawler 
        // and can use access keys
        if (!caps.Crawler && caps.SupportsAccesskeyAttribute)
            return true;
        return false;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
    <mobile:Form runat="server" id="Form1" >
        <mobile:Label Runat="server">This is Form1</mobile:Label>
        <mobile:Command id="cmd1" runat="server" Text="No AccessKey" 
            onClick="Command_OnClick">
            <DeviceSpecific>
               <Choice Filter="isAccessKey" Text="AccessKey is 1"/>
            </DeviceSpecific>
        </mobile:Command>
        <mobile:Label id="Label1" runat="server" />
    </mobile:Form>
    <mobile:Form ID="Form2" Runat="server">
        <mobile:Label Runat="server">This is Form2</mobile:Label>
        <mobile:Command id="cmd2" runat="server" text="Back to Form1"
            onClick="Command_OnClick">
            <DeviceSpecific>
                <Choice Filter="isAccessKey" Text="1 is AccessKey" AccessKey="1" />
            </DeviceSpecific>
        </mobile:Command>
    </mobile:Form>
</body>
</html>

<%@ Page Language="VB" 
    Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile" 
    Namespace="System.Web.UI.MobileControls" 
    Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.Mobile" %>

<script runat="server">
    ' <Snippet2>
    Private Sub Command_OnClick(ByVal sender As Object, ByVal e As EventArgs)
        ' Display the other form
        If ActiveForm.ID = "Form1" Then
            ActiveForm = Form2
        Else
            ActiveForm = Form1
        End If
    End Sub
    ' </Snippet2>

    Public Function isAccessKey(ByVal caps As MobileCapabilities, _
        ByVal optValue As String) As Boolean
        
        ' Determine if the browser is not a Web crawler 
        ' and can use access keys
        If Not caps.Crawler AndAlso caps.SupportsAccesskeyAttribute Then
            Return True
        End If
        Return False
    End Function

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
    <mobile:Form runat="server" id="Form1" >
        <mobile:Label ID="Label1" Runat="server">This is Form1</mobile:Label>
        <mobile:Command id="cmd1" runat="server" Text="No AccessKey" 
            onClick="Command_OnClick">
            <DeviceSpecific>
               <Choice Filter="isAccessKey" Text="AccessKey is 1"/>
            </DeviceSpecific>
        </mobile:Command>
        <mobile:Label id="Label2" runat="server" />
    </mobile:Form>
    <mobile:Form ID="Form2" Runat="server">
        <mobile:Label ID="Label3" Runat="server">This is Form2</mobile:Label>
        <mobile:Command id="cmd2" runat="server" text="Back to Form1"
            onClick="Command_OnClick">
            <DeviceSpecific>
                <Choice Filter="isAccessKey" Text="1 is AccessKey" AccessKey="1" />
            </DeviceSpecific>
        </mobile:Command>
    </mobile:Form>
</body>
</html>

Remarks

When a page is initially rendered, the first form in the page is automatically made active. On subsequent postbacks, another form might be made active, either by programmatically setting this property, or as a result of user navigation through a Link control.

Applies to

See also