CheckBoxList in DataList Question?

[Patrick.O.Ige]

I have a CheckBoxList in a DataList and i'm trying to get item Selected
after doing a postBack.
I have set my CheckBoxlist AutoPostBack="True"
Any ideas what 'm doing wrong?
It seems not to work
Thanks



My CheckBoxList in the DataList Below
-----------------------------------------
<asp:checkboxlist id="checkboxlist1" Runat="server" AutoPostBack="True"
OnSelectedIndexChanged="Check_Clicked"></asp:checkboxlist>

The itemDataBound I created below:-
--------------------------------------

Public Sub Item_Created(ByVal sender As Object, ByVal e As
DataListItemEventArgs) Handles DataList1.ItemDataBound
If e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem
Then

Dim cblGroups As CheckBoxList =
CType(e.Item.FindControl("checkboxlist1"), CheckBoxList)

'This is where i added the Handler
AddHandler cblGroups.SelectedIndexChanged, AddressOf Check_Clicked

Dim DS As DataSet
Dim MyConnection As SqlConnection
Dim MyCommand As SqlDataAdapter

MyConnection = New
SqlConnection("server=(local);database=pubs;integrated security=true;")
MyCommand = New SqlDataAdapter("select TOP 5 * from Authors",
MyConnection)

DS = New DataSet
MyCommand.Fill(DS, "Authors")


MyConnection.Open()



If Not (cblGroups Is Nothing) Then
cblGroups.Visible = True
cblGroups.DataSource = DS
'cblGroups.DataMember = "Groups"
cblGroups.DataTextField = "au_lname"
cblGroups.DataValueField = "au_id"
cblGroups.DataBind()



End If
MyConnection.Dispose()
End If



End Sub


And here the event thats suppose to fire the CheckBoxList below
----------------------------------------------------------------
Sub Check_Clicked(ByVal sender As Object, ByVal e As EventArgs)
Dim i As Integer
For i = 0 To checkboxlist1.Items.Count - 1
If checkboxlist1.Items(i).Selected Then
Message.Text = Message.Text &
checkboxlist1.Items(i).Selected & "<br>"
Else
Message.Text = Message.Text & "false <br>"
End If

Next

End Sub

 

[Jeremy S]

You should familiarize youself with "event bubbling". You will likely need
to handle the CheckBoxList events via the DataList's ItemCommand event
procedure.

This link explains more - while not specifically for the CheckBoxList
control, the information provided will generalize to it.
http://authors.aspalliance.com/hmcheung/Articles/030331/Default.aspx

You can google this for more:
"asp.net" + "DataList" + "bubbling"

-HTH

 

[Patrick.O.Ige]

Jeremy thx for the reply.
But is doing this not enough by adding AddHandler in the ItemDataBound like
so:-
AddHandler cblGroups.SelectedIndexChanged, AddressOf
cblGroups_SelectedIndexChanged

Bcos i'm already DataBinding in the ItemDataBound.

My main question that i don't get is can i add the method
SelectedIndexChanged i have set in my checkboxllist to my

ItemDataBound by using the AddHandler?

And if not what would i have to set SelectedIndexChanged in my
DataList1_ItemDataBound and not in my CheckBoxlist.

Thanks







----- Original Message -----
From: "Jeremy S" <[email protected]>
Newsgroups: microsoft.public.dotnet.framework.aspnet
Sent: Sunday, June 19, 2005 5:29 PM
Subject: Re: CheckBoxList in DataList Question?

You should familiarize youself with "event bubbling". You will likely need
to handle the CheckBoxList events via the DataList's ItemCommand event
procedure.

This link explains more - while not specifically for the CheckBoxList
control, the information provided will generalize to it.
http://authors.aspalliance.com/hmcheung/Articles/030331/Default.aspx

You can google this for more:
"asp.net" + "DataList" + "bubbling"

-HTH

 

[Jeremy S]

You really need to understand event bubbling. Period. When the controls
INSIDE the Datalist fire their events, they get bubbled up through the
containing control (i.e., the DataList). The containing control (DataList)
then fires events that you can handle. There are articles and samples that
describe this far better than I can. Do some research on Event Bubbling -
it's is the thing you need to understand... and simple once understood. It
does not matter that you have added the handler for
cblGroups_SelectedIndexChanged as that particular event will NOT be fired
when your list is contained within a DataList. It would work IF your
checkboxlist was on the page, itself - but it's not. It's hiding inside of a
DataList.

-HTH

 

[Patrick Olurotimi Ige]

Def Jeremy i'd get to it.
I haven't just really needed to do much with such scenario.
Thats why i was looking for a solution for now.
Thx