I have a dropdown combo box on a form and I have its AutoPostBack property
set to true. When I select something from the list it does a postback and
then the Page_Load event fires followed by it's SelectedIndexCh anged event.
However, when I go back to this control again and select the first item in
the list, it does a postback and the Page_Load event fires, but the
SelectedIndexCh anged doesn't fire. Why does the SelectedIndexCh anged get
skipped when selecting the first item in the list?
In summary, I have a dropdown list. I select the 3rd item in the list and
the SelectedIndexCh anged fires like it should. As I step through the code I
see the selected index = 2. Now when I go back and select the first item in
the list and step through the code I can see the selected index =0 (changed
from 2), but the SelectedIndexCh anged doesn't fire.
How can I resolve this?
Thanks.
-- mo*******@nospa m.com 12  3992 
Make sure the event is defined (instantiated) in the IntializeCompon ent
procedure.
--
Peter O'Reilly
Can you give me an example of how I would do that? (vb.net if you can....)
Its not in the IntializeCompon ent and its simply declared like this:
Protected WithEvents cmbShipMethod As System.Web.UI.W ebControls.Drop DownList
Thanks.
-- mo*******@nospa m.com
"Peter O'Reilly" <Pe***********@ timeinc.com!N!O !.S!P!AM!> wrote in message
news:ee******** *****@TK2MSFTNG P09.phx.gbl... Make sure the event is defined (instantiated) in the IntializeCompon ent
procedure.
--
Peter O'Reilly
Hello,
Based on your description, I build a simple test web form. However, I
haven't found the problem you mentioned. I just add some code in
DropDownList1_S electedIndexCha nged:
Private Sub DropDownList1_S electedIndexCha nged(ByVal sender As Object,
ByVal e As System.EventArg s) Handles DropDownList1.S electedIndexCha nged
Response.Write( "changed")
End Sub
And add a breakpoint at the line. After run the application, the breakpoint
get stopped whenever I select a item in the dropdown list control.
Can you post some of your code to clarify the problem? Maybe we can get
more detail informaiton from that.
Luke
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
It is really a strange problem! After check your code, I found it seems to
be related to your base page. If I added the control on a normal web form,
it worked. Especially, with the MoveControl method in base page. Everytime
we select a item, the code in MoveControls will be executed, and it cause
the problem. If I remove the MoveControls, and add the control in another
way:
Public Class zTestDropdown
Inherits BrowserTest.Bas ePage
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
Dim cc As Control = Page.LoadContro l("shoppingcart .ascx")
cc.Visible = True
Me.ContentArea. Controls.Add(cc )
End Sub
This seems to fix the problem.
Luke
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
Hello,
This time the 'bad" line is:
Me.cellContentC ontainer.Contro ls.Clear()
If I replace it with
Me.cellContentC ontainer.Contro ls.RemoveAt(0)
Dim l1 As New LiteralControl
Me.cellContentC ontainer.Contro ls.Add(l1)
Me.cellContentC ontainer.Contro ls.Add(cc)
Then it seem to work.
Regarding all of these issues, I suggest you may consider frameset instead
embed asp.net user control. For example, in the default.aspx:
<td id="cellContent Container" vAlign="top" bgColor="#ccccf f" runat="server">
<iframe src=home.aspx></iframe>
</td>
How about this?
Luke
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
I found one piece of information that may or may not lead to some insight:
I re-created this page as a stand alone page (did not inherit from the
basepage), and put all the html and code behind from the shoppingcart.as cx
into shoppingcart.as px and noticed I was still getting the same bad
behavior. After testing it I found that cmbShipMethod's viewstate was
false. After setting it to true, I found that everything worked OK. I'm
sure that ealier I had tested viewstate as both true and false on everything
I could find to see it that would help, but for some reason it helped on
this new page. So I went back to the derived page with shoppingcart.as cx
(the one I gave you in the above posting) and found that setting the
viewstate to true or false had no effect on the behavior. My conclusion
thus far is that there might be some problem with the dropdownlist's
viewstate from the user control or because the page is inheriting from the
base page, or a combo of both.
-- mo*******@nospa m.com
"moondaddy" <mo*******@nosp am.com> wrote in message
news:eL******** ******@TK2MSFTN GP11.phx.gbl... This is getting really confusing and frustrating. The code that didn't
work is code that was given to me in this user group. It worked under a
previous scenario, but not this one. How should one know when to use what syntax?
This isn't documented. I'm not coming down on you as you are being a
great help and I'm happy for that. However, as soon as the environment changes
a bit, the code doesn't work again and I have to ask you again for a
solution. Either I really don't know how to use the dropdown or it has some
shortcomings in these more complicated environments in which case the
development team needs to know about this if they don't already. OK
enough of that rant.
Switching user controls is leading to lots of various problems so I'm
going with a slightly different model. This one is where each user control
(controls used for the main content of a page) get their own page and each
page inherits from the basepage. This way there's no confusion as to
which page a control is in. For example, the products.ascx lives in
products.aspx, aboutus.ascx lives in aboutus.aspx, and so on. Not as
elegant (or fast... I think) as one page-many controls, but more stable.
So back to this troubled dropdown. Your code below worked when trading
out a control for another, but this time the shoppingcart control is constant
in the shoppingcart page and we're back to the same old problem.
I'm attaching a new sample project. run this project using default.aspx
as the startup page and click
on the link on the left "Shoppingca rt Test" to load the shopping cart for
testing. You will see what I mean. If you can help with this it would be
great as this is the model I think I'm going to go with.
As for your comment about using frames. I wish I could. I spent the
first part of this project building it out in frames and it worked totally
great. but for reasons I have to do away with frames and so here I am.
Thanks again!!!
--
mo*******@nospa m.com
"[MSFT]" <lu******@onlin e.microsoft.com > wrote in message
news:Uu******** *****@cpmsftngx a10.phx.gbl... Hello,
This time the 'bad" line is:
Me.cellContentC ontainer.Contro ls.Clear()
If I replace it with
Me.cellContentC ontainer.Contro ls.RemoveAt(0)
Dim l1 As New LiteralControl
Me.cellContentC ontainer.Contro ls.Add(l1)
Me.cellContentC ontainer.Contro ls.Add(cc)
Then it seem to work.
Regarding all of these issues, I suggest you may consider frameset
instead embed asp.net user control. For example, in the default.aspx:
<td id="cellContent Container" vAlign="top" bgColor="#ccccf f"
runat="server">
<iframe src=home.aspx></iframe>
</td>
How about this?
Luke
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
To get the event from controls. Viewstate is necessary. Regarding the
issue, I can't open you sample project "BsPgSample ", it reported an error
when I open ShoppingCart.as px. I check the code with Notepad and find the
movecontrols method is still used. This may the root cause of the problem
Luke
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
I have to use the movecontrols method because the base page has table in it
which is used to hold a user control for the header and another user control
for the left nav bar. with our the movecontrols method, things dont get
placed on the page correctly. the header and nav bar are on the bottom of
the page.
What kind of error did you get? could you open any other page? I would
like to send you a working sample if possible. This whole thread stems from
a shortage of good documentation and sample code for base pages in vb.net
and I've spend a ton of time trying to get a solid model working. It would
be nice if someone from MS could help in getting a proper base page working.
Please let me know what I can do so send you a sample that runs.
Thanks.
-- mo*******@nospa m.com
"[MSFT]" <lu******@onlin e.microsoft.com > wrote in message
news:5D******** ******@cpmsftng xa10.phx.gbl... To get the event from controls. Viewstate is necessary. Regarding the
issue, I can't open you sample project "BsPgSample ", it reported an error
when I open ShoppingCart.as px. I check the code with Notepad and find the
movecontrols method is still used. This may the root cause of the problem
Luke
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
Thanks, I think this will fix the load problem: Attached are 2 text files,
one with the base page html and the other with the code behind. Delete the
existing base page out of the project I sent you (BsPgSample) and add a new
webworm and call it "Base.aspx" . Then add the html and code behind from the
attached text files and it should run OK. Make sure that shopping.aspx
inherits from the new base correctly (Inherits BsPgSample.Base ).
Please let me know if this fixed the load problem and what you can find out.
-- mo*******@nospa m.com
"[MSFT]" <lu******@onlin e.microsoft.com > wrote in message
news:vo******** ******@cpmsftng xa10.phx.gbl... I can open the solution. But when I double click to open
shoppingcart.as px, there was an error. I have attached it in this message.
Luke This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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