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Item Type: NewsGroup Date Entered: 1/30/2004 7:13:08 PM Date Modified: Subscribers: 0 Subscribe Alert
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willzofsteel
Asp.Net User
dropdownlist menu control doesnt do what i tell it!1/30/2004 7:13:08 PM

0/0

Hello everyone,
I am building a composite control that contains 4 dropdownlist. Each dropdown contains options that the user will select to browse to a certain page. Depending on which one they pick,a url is created with the selecteditem as part of the querystring. I want to be able to redirect from the control and not from the page, so first question is, is it even possible because I keep trying and it doesnt seem to work. 2nd if it truly is impossible then how can i get it work at the page level, because when i put my control in the Page_Load sub like this 


Sub Page_Load(S as Object, E as EventArgs)





if not IsPostBack then


mydropdownmenu.selectedIndex = 1   'this errors out


end if





if isPostBack then


 response.redirect(mydropdownmenu.selectedItem)  





                                              'this does nothing, but it wont error





end if





End Sub


and also Im using codebehind for my page, but It seems the only way i can get it to work is by using inline asp tags

so if i do this on the actual page 


<%response.redirect(mydropdownMenu.selectedItem)%>


this will actually work. so then my other question is,
in which event are <%%> tags processed.

I thank you for your time reading this and your help.
master4eva
Asp.Net User
Re: dropdownlist menu control doesnt do what i tell it!1/31/2004 6:13:36 AM

0/0

Ok, ok - so how are you doing this on the actual control. I think that you are data binding every post back. So this is the fix if my assumption is correct: 


protected override void OnInit(EventArgs e) {


   // data binding


   base.OnInit(e);


}
-- Justin Lovell
willzofsteel
Asp.Net User
Re: dropdownlist menu control doesnt do what i tell it!2/2/2004 10:15:48 PM

0/0

ok i tryed that and the same thing,
here is the code from my control, 



Imports System.Web


Imports System.Web.UI


Imports System.Web.UI.WebControls


Imports System.Data


Imports System.Data.SqlClient


Imports System.Collections


Imports System.Xml


Imports Mysite





Namespace Skin.SharedControls


    Public Class BrowseBar


        Inherits SkinControlBase








        'The Default properties of the control


        Private DefaultPath As String = "../Skins/NavBarControls/DefaultBrowseBar.ascx"


        Private GLabel As String = "GENRE"


        Private SLabel As String = "STUDIO"


        Private PLabel As String = "PERFORMER"


        Private DLabel As String = "DIRECTOR"





        'The child controls of the control


        Private WithEvents ddGenre As DropDownList


        Private WithEvents ddStudio As DropDownList


        Private WithEvents ddPerformer As DropDownList


        Private WithEvents ddDirector As DropDownList








        'the event handler


        Public Event SelectedIndexChanged(ByVal Sender As Object, ByVal E As EventArgs)





        Public ReadOnly Property SelectedItem() As String


            Get


                If Not ddGenre.SelectedIndex = 0 Then


                    Return (ddGenre.SelectedValue)


                End If





                If Not ddStudio.SelectedIndex = 0 Then


                    Return (ddStudio.SelectedValue)


                End If





                If Not ddPerformer.SelectedIndex = 0 Then


                    Return (ddPerformer.SelectedValue)


                End If





                If Not ddDirector.SelectedIndex = 0 Then


                    Return (ddDirector.SelectedValue)


                End If





            End Get


        End Property





        'The constructor----executes when the page loads each control


        Public Sub New()





            If VirtualPath = "" Then


                VirtualPath = DefaultPath


            End If


        End Sub





        Private Sub SelectedIndexChangedClik(ByVal S As Object, ByVal E As EventArgs)


            OnSelectedIndexChanged(EventArgs.Empty)


        End Sub





        Public Sub OnSelectedIndexChanged(ByVal E As EventArgs)


            RaiseEvent SelectedIndexChanged(Me, E)


        End Sub








        'The Initialize---Initializes the control before rendering


        Protected Overrides Sub Initialize(ByVal skincontrol As System.Web.UI.Control)


            Dim theList As New ArrayList








            'find the child controls on our parent control


            Dim GenreLabel As Label = skincontrol.FindControl("GenreLabel")


            ddGenre = skincontrol.FindControl("Genre")





            Dim StudioLabel As Label = skincontrol.FindControl("StudioLabel")


            ddStudio = skincontrol.FindControl("Studio")





            Dim PerformerLabel As Label = skincontrol.FindControl("PerformerLabel")


            ddPerformer = skincontrol.FindControl("Performer")





            Dim DirectorLabel As Label = skincontrol.FindControl("DirectorLabel")


            ddDirector = skincontrol.FindControl("Director")











            AddHandler ddGenre.SelectedIndexChanged, AddressOf SelectedIndexChangedClik


            AddHandler ddStudio.SelectedIndexChanged, AddressOf SelectedIndexChangedClik


            AddHandler ddPerformer.SelectedIndexChanged, AddressOf SelectedIndexChangedClik


            AddHandler ddDirector.SelectedIndexChanged, AddressOf SelectedIndexChangedClik








            GenreLabel.Text = GLabel


            StudioLabel.Text = SLabel


            PerformerLabel.Text = PLabel


            DirectorLabel.Text = DLabel








            'Set the dropdown boxes


            ddGenre.DataSource = GetGenre()


            ddGenre.DataTextField = "GENRE"


            ddGenre.DataValueField = "GENRE_ID"


            ddGenre.DataBind()








            ddStudio.DataSource = GetStudio()


            ddStudio.DataTextField = "STUDIO"


            ddStudio.DataValueField = "STUDIO_ID"


            ddStudio.DataBind()





            theList = ABCList() ' this variable holds the characters for the alphabet list





            ddPerformer.DataSource = theList


            ddPerformer.DataBind()





            ddDirector.DataSource = theList


            ddDirector.DataBind()





            ddGenre.Items.Insert(0, "--Select One--")


            ddStudio.Items.Insert(0, "--Select One--")


            ddPerformer.Items.Insert(0, "--Select One--")


            ddDirector.Items.Insert(0, "--Select One--")





            ddGenre.SelectedIndex = ddGenre.Items.IndexOf(ddGenre.Items.FindByText("--Select One--"))


            ddStudio.SelectedIndex = ddStudio.Items.IndexOf(ddStudio.Items.FindByText("--Select One--"))


            ddPerformer.SelectedIndex = ddPerformer.Items.IndexOf(ddPerformer.Items.FindByText("--Select One--"))


            ddDirector.SelectedIndex = ddDirector.Items.IndexOf(ddDirector.Items.FindByText("--Select One--"))





        End Sub





        Protected Overrides Sub OnLoad(ByVal E As EventArgs)


            EnsureChildControls()


        End Sub





        'Retrieve the Genre info from DB and store in DataSet


        Protected Function GetGenre() As DataSet


            Dim sqlstr As String = "select * from genre " & _


                                    "Where not ACTIVE_FLAG = 'i' "


            Dim WLG As New WantedGlobal


            Dim myconnection As New SqlConnection(WLG.ConnString)


            Dim mycmd As New SqlCommand(sqlstr, myconnection)


            Dim myadapter As New SqlDataAdapter


            Dim mydataset As New DataSet





            myadapter.SelectCommand = mycmd


            myadapter.SelectCommand.Connection.Open()


            myadapter.Fill(mydataset)


            myadapter.SelectCommand.Connection.Close()





            Return (mydataset)








        End Function





        'Retrieve the Studio " " ----same as above


        Protected Function GetStudio() As DataSet


            Dim sqlstr As String = "select * from studio " & _


                                    "Where STATUS = 'A' "





            Dim WLG As New WantedGlobal


            Dim myconnection As New SqlConnection(WLG.ConnString)


            Dim mycmd As New SqlCommand(sqlstr, myconnection)


            Dim myadapter As New SqlDataAdapter


            Dim mydataset As New DataSet





            myadapter.SelectCommand = mycmd


            myadapter.SelectCommand.Connection.Open()


            myadapter.Fill(mydataset)


            myadapter.SelectCommand.Connection.Close()





            Return (mydataset)





        End Function





        'Fill an arraylist with the alphabet to bind to our dropdown


        Protected Function ABCList() As ArrayList


            Dim str As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"


            Dim alphabet As Char


            Dim theSource As New ArrayList





            For Each alphabet In str


                theSource.Add(alphabet)


            Next





            Return (theSource)


        End Function





        Public Function Redirect()


            Dim response As HttpResponse





            response.Redirect(SelectedItem)


        End Function


    End Class





End Namespace
master4eva
Asp.Net User
Re: dropdownlist menu control doesnt do what i tell it!2/3/2004 5:16:44 PM

0/0

With this method: 


Protected Overrides Sub Initialize(ByVal skincontrol As System.Web.UI.Control)


   ' ...


End Sub

It should be: 


Protected Overrides Sub OnInit(ByVal e As EventArgs)


   ' ...





   MyBase.OnInit(e)


End Sub
-- Justin Lovell
willzofsteel
Asp.Net User
Re: dropdownlist menu control doesnt do what i tell it!2/3/2004 7:26:05 PM

0/0

Ok i will try that but what about my base class that the control inherits from. 






Imports System


Imports System.Web.UI





Namespace Skin





    Public MustInherit Class SkinControlBase


        Inherits Control


        Implements INamingContainer





        Private skinControl As Control


        Private skinVirtualPath As String = ""





        Public Property VirtualPath() As String


            Get


                Return skinVirtualPath


            End Get





            Set(ByVal Value As String)


                skinVirtualPath = Value


            End Set


        End Property





        Protected Overrides Sub CreateChildControls()





            Controls.Clear()


            MyBase.CreateChildControls()





            Try





                PreInitialize()





                Controls.Add(skinControl)





                Initialize(skinControl)





            Catch ex As Exception


            Finally


            End Try








        End Sub








        Private Function PreInitialize()


            skinControl = Page.LoadControl(skinVirtualPath)


        End Function





        Protected MustOverride Sub Initialize(ByVal skincontrol As Control)








    End Class


End Namespace


i used this example for my base skin class. What do i need to change in it so that I can do a postback from my control and process redirects only in my control?
Thank you helping me Master4eva, I am really grateful!
master4eva
Asp.Net User
Re: dropdownlist menu control doesnt do what i tell it!2/3/2004 8:03:38 PM

0/0

Hmmm... it looks like my suggestion will work. Obviously, you do not need to declare (or call) the Initialize method if you follow my suggestion.
-- Justin Lovell
willzofsteel
Asp.Net User
Re: dropdownlist menu control doesnt do what i tell it!2/3/2004 9:07:41 PM

0/0

ok here is the OnInit, am i doing this wrong? 



 Protected Overrides Sub OnInit(ByVal e As EventArgs)


            'The Initialize---Initializes the control before rendering


            MyBase.OnInit(e)








            Dim skincontrol As Control


            Dim theList As New ArrayList








            'find the child controls on our parent control


            Dim GenreLabel As Label = skincontrol.FindControl("GenreLabel")


            ddGenre = skincontrol.FindControl("Genre")





            Dim StudioLabel As Label = skincontrol.FindControl("StudioLabel")


            ddStudio = skincontrol.FindControl("Studio")





            Dim PerformerLabel As Label = skincontrol.FindControl("PerformerLabel")


            ddPerformer = skincontrol.FindControl("Performer")





            Dim DirectorLabel As Label = skincontrol.FindControl("DirectorLabel")


            ddDirector = skincontrol.FindControl("Director")





            AddHandler ddGenre.SelectedIndexChanged, AddressOf ddIndexChanged


            AddHandler ddStudio.SelectedIndexChanged, AddressOf ddIndexChanged


            AddHandler ddPerformer.SelectedIndexChanged, AddressOf ddIndexChanged


            AddHandler ddDirector.SelectedIndexChanged, AddressOf ddIndexChanged








            GenreLabel.Text = GLabel


            StudioLabel.Text = SLabel


            PerformerLabel.Text = PLabel


            DirectorLabel.Text = DLabel








            'Set the dropdown boxes


            ddGenre.DataSource = GetGenre()


            ddGenre.DataTextField = "GENRE"


            ddGenre.DataValueField = "GENRE_ID"


            ddGenre.DataBind()








            ddStudio.DataSource = GetStudio()


            ddStudio.DataTextField = "STUDIO"


            ddStudio.DataValueField = "STUDIO_ID"


            ddStudio.DataBind()





            theList = ABCList() ' this variable holds the characters for the alphabet list





            ddPerformer.DataSource = theList


            ddPerformer.DataBind()





            ddDirector.DataSource = theList


            ddDirector.DataBind()





            ddGenre.Items.Insert(0, "--Select One--")


            ddStudio.Items.Insert(0, "--Select One--")


            ddPerformer.Items.Insert(0, "--Select One--")


            ddDirector.Items.Insert(0, "--Select One--")





            ddGenre.SelectedIndex = ddGenre.Items.IndexOf(ddGenre.Items.FindByText("--Select One--"))


            ddStudio.SelectedIndex = ddStudio.Items.IndexOf(ddStudio.Items.FindByText("--Select One--"))


            ddPerformer.SelectedIndex = ddPerformer.Items.IndexOf(ddPerformer.Items.FindByText("--Select One--"))


            ddDirector.SelectedIndex = ddDirector.Items.IndexOf(ddDirector.Items.FindByText("--Select One--"))





        End Sub


I just left the old function empty 


Protected Overrides Initialization(skincontrol as Control)


I get this when I try to use the onInit function 





[NullReferenceException: Object reference not set to an instance of an object.]


   Wantedlistv2.Skin.SharedControls.BrowseBar.OnInit(EventArgs e)


   System.Web.UI.Control.InitRecursive(Control namingContainer) +240


   System.Web.UI.Control.InitRecursive(Control namingContainer) +178


   System.Web.UI.Control.InitRecursive(Control namingContainer) +178


   System.Web.UI.Page.ProcessRequestMain() +174


Im still pretty new to asp.net but Im trying my best to understand. thank you for your time and help.
master4eva
Asp.Net User
Re: dropdownlist menu control doesnt do what i tell it!2/5/2004 1:51:00 PM

0/0

There is something already that I can already see. It is just the moving of code around: 


Protected Overrides Sub OnInit(ByVal e As EventArgs)


   ' the data binding code goes here





   MyBase.OnInit(e) ' this should be called last


End Sub

And regarding the error, which line is it occuring?
-- Justin Lovell
8 Items, 1 Pages 1 |< << Go >> >|


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