Custom Control Postback inside DataList *SOLVED*

[Nigh™a®e]

Hi,

Im making some custom controls including a button that can be changed into Button, Linkbutton or Imagebutton by using the Type Param inside HTML Tags

The following code works fine as button on a page.

<HostingControls:Button ID="buttonAdd" Runat="server" Type="Link" Text="Add" />

The following code is the same button inside a Datalist.
The button doesnt forward the event to the datalist ItemCommand event. A normal ASP:Linkbutton does.

<HostingControls:Button CommandName="select" Runat="server" Type="Link" Text="Read more" />

<!--/ Old button: <asp:LinkButton Runat="server" CommandName="select">Read more</asp:LinkButton> /-->

This is the full source of the Custom Button Class.

    <DefaultProperty("Text"), ToolboxData("<{0}:Button runat=server></{0}:Button>")> Public Class Button
        Inherits System.Web.UI.WebControls.WebControl
        Implements IPostBackEventHandler

        Public Event Click As EventHandler

        Public Enum ButtonType
            Button = 0
            Link = 1
            Image = 2
        End Enum

        Private varText As String
        Private varCommandName As String
        Private varCommandArgument As String
        Private varImageUrl As String = ""
        Private varType As ButtonType = ButtonType.Button

        <Bindable(True), Category("Appearance"), DefaultValue("")> Property Text() As String
            Get
                Return varText
            End Get

            Set(ByVal Value As String)
                varText = Value
            End Set
        End Property

        <Category("Appearance"), DefaultValue("")> Public Property CommandName() As String
            Get
                Return varCommandName
            End Get
            Set(ByVal Value As String)
                varCommandName = Value
            End Set
        End Property

        <Category("Appearance"), DefaultValue("")> Public Property CommandArgument() As String
            Get
                Return varCommandArgument
            End Get
            Set(ByVal Value As String)
                varCommandArgument = Value
            End Set
        End Property

        <Category("Appearance"), DefaultValue("")> Public Property ImageUrl() As String
            Get
                Return varImageUrl
            End Get
            Set(ByVal Value As String)
                varImageUrl = Value
            End Set
        End Property

        <Category("Appearance"), DefaultValue(GetType(ButtonType), "Button")> Public Property Type() As ButtonType
            Get
                Return varType
            End Get
            Set(ByVal Value As ButtonType)
                varType = Value
            End Set
        End Property

        Protected Overrides Sub Render(ByVal output As System.Web.UI.HtmlTextWriter)
            Dim varPostbackString As String = "javascript:" & Page.GetPostBackEventReference(Me, "")

            output.AddAttribute(HtmlTextWriterAttribute.Id, Me.ClientID)
            output.AddAttribute(HtmlTextWriterAttribute.Name, Me.UniqueID)
            If Not (varCommandName Is Nothing) Then
                output.AddAttribute("CommandName", varCommandName)
            End If
            If Not (varCommandArgument Is Nothing) Then
                output.AddAttribute("CommandArgument", varCommandArgument)
            End If

            Select Case Type
                Case ButtonType.Button
                    output.AddAttribute(HtmlTextWriterAttribute.Type, "button")
                    output.AddAttribute(HtmlTextWriterAttribute.Value, Text)
                    output.AddAttribute(HtmlTextWriterAttribute.Onclick, varPostbackString)
                    output.RenderBeginTag(HtmlTextWriterTag.Input)
                    output.RenderEndTag()
                Case ButtonType.Link
                    output.AddAttribute(HtmlTextWriterAttribute.Href, varPostbackString)
                    output.RenderBeginTag(HtmlTextWriterTag.A)
                    output.Write(Text)
                    output.RenderEndTag()
                Case ButtonType.Image
                    output.AddAttribute(HtmlTextWriterAttribute.Type, "image")
                    output.AddAttribute(HtmlTextWriterAttribute.Onclick, varPostbackString)
                    output.AddAttribute(HtmlTextWriterAttribute.Alt, Text)
                    output.AddAttribute(HtmlTextWriterAttribute.Src, EngineGlobals.DataUrl(varImageUrl))
                    output.AddAttribute(HtmlTextWriterAttribute.Border, "0")
                    output.RenderBeginTag(HtmlTextWriterTag.Input)
                    output.RenderEndTag()
            End Select
        End Sub

        Protected Overridable Sub OnClick(ByVal e As EventArgs)
            RaiseEvent Click(Me, e)
        End Sub

        Public Sub RaisePostBackEvent(ByVal eventArgument As String) Implements System.Web.UI.IPostBackEventHandler.RaisePostBackEvent
            OnClick(EventArgs.Empty)
        End Sub

    End Class

[Nigh™a®e]

Found the solution

I added RaiseBubbleEvent method in the RaisePostBackEvent.
This method seems to forward the postback to the parent control.

Previous code

        Public Sub RaisePostBackEvent(ByVal eventArgument As String) Implements System.Web.UI.IPostBackEventHandler.RaisePostBackEvent
            OnClick(EventArgs.Empty)
        End Sub

Current code

        Public Sub RaisePostBackEvent(ByVal eventArgument As String) Implements System.Web.UI.IPostBackEventHandler.RaisePostBackEvent
            Dim varArg As CommandEventArgs = New CommandEventArgs(CommandName, CommandArgument)
            RaiseBubbleEvent(Me, varArg)
            OnClick(EventArgs.Empty)
        End Sub