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Sep 15th, 2008, 05:40 AM
#1
Thread Starter
Lively Member
Formview's dropdownlist is not being populated after ItemInserted
Hello,
I've got formview that is always in insert mode: dropdownlist populated from some other db table and a textbox.
When user clicks insert:
- the selected value from the ddlist is ignored, and the textbox value is written in db
- the ddlist is not populated again, although I placed the sub for populating that ddlist in page_load (regardless of ispostback or not) and after the insert.
See for yourself (be my guest and enter whatever data you wish):
http://www.movie-remakes.com/kp/epiz...SIMPLE_EN.aspx
And here is the code (1st part, codebehind):
Code:
<%@ Page Language="VB" ValidateRequest="false" Debug="true" SmartNavigation="true" %>
<%@ Register src="../inc_main.ascx" tagname="ucMain" tagprefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Dim myID As Integer
Dim rs As System.Data.IDataReader
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
' myID IS THE VALUE OF THE DB MASTER TABLE THAT IS INSERTED INTO NEW RECORDS AS FIELD ID_epiz
myID = 1
'POPULATING GRIDVIEW
SetGridview(DSautori, gvAutori, "SELECT veza_epiz_autor.ID AS veza_epiz_autor__ID, veza_epiz_autor.ID_autor AS veza_epiz_autor__ID_autor, veza_epiz_autor.funkcija AS veza_epiz_autor__funkcija, autori.ime AS autori__ime, autori.prezime AS autori__prezime FROM veza_epiz_autor LEFT JOIN autori ON veza_epiz_autor.ID_autor=autori.ID WHERE veza_epiz_autor.ID_epiz=" & myID & " ORDER BY veza_epiz_autor.ID")
' POPULATING FORMVIEW'S DROPDOWNLIST ddlID_autor
populate_fvAutori_ddlID_autor()
End Sub
Sub populate_fvAutori_ddlID_autor()
Inc.cnOpen()
rs = Inc.cnExec("SELECT ID, ime, prezime FROM autori ORDER BY prezime, ime")
Dim tmpddl1 As DropDownList = CType(FindControl("fvAutori").FindControl("ddlID_autor"), DropDownList)
tmpddl1.Items.Clear()
tmpddl1.Items.Add(New ListItem("-undefined-", "-1"))
While rs.Read()
tmpddl1.Items.Add(New ListItem(rs("ime").ToString & " " & rs("prezime").ToString, rs("ID").ToString))
End While
Inc.cnClose()
End Sub
Sub SetGridview(ByVal DSwhich As SqlDataSource, ByVal GVwhich As GridView, ByVal strSC As String)
DSwhich.ConnectionString = Inc.getCnString()
DSwhich.ProviderName = Inc.getProviderName()
DSwhich.SelectCommand = strSC
GVwhich.DataBind()
End Sub
Protected Sub gvAutori_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
If e.Row.RowState = DataControlRowState.Normal Or e.Row.RowState = DataControlRowState.Alternate Then
' ROW IS IN ITEM/ALTERNATINGITEM MODE
' POPULATING LABELS lblautor1, lblfunkcija
CType(e.Row.FindControl("lblautor1"), Label).Text = DataBinder.Eval(e.Row.DataItem, "autori__ime").ToString & " " & DataBinder.Eval(e.Row.DataItem, "autori__prezime").ToString
CType(e.Row.FindControl("lblfunkcija"), Label).Text = DataBinder.Eval(e.Row.DataItem, "veza_epiz_autor__funkcija").ToString
ElseIf e.Row.RowState = DataControlRowState.Edit Or e.Row.RowState.ToString = "Alternate, Edit" Then
' ROW IS IN EDIT MODE
' POPULATING DDLIST ddlID_autor
Inc.cnOpen()
rs = Inc.cnExec("SELECT ID, ime, prezime FROM autori ORDER BY prezime, ime")
Dim tmpddl1 As DropDownList = CType(e.Row.FindControl("ddlID_autor"), DropDownList)
tmpddl1.Items.Add(New ListItem("-undefined-", "-1"))
While rs.Read()
tmpddl1.Items.Add(New ListItem(rs("ime").ToString & " " & rs("prezime").ToString, rs("ID").ToString))
End While
tmpddl1.SelectedValue = DataBinder.Eval(e.Row.DataItem, "veza_epiz_autor__ID_autor").ToString
Inc.cnClose()
' POPULATING TEXTBOX txtfunkcija
CType(e.Row.FindControl("txtfunkcija"), TextBox).Text = DataBinder.Eval(e.Row.DataItem, "veza_epiz_autor__funkcija").ToString
End If
End If
End Sub
Protected Sub gvAutori_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs)
' UPDATING RECORD IN THE DATABASE TABLE veza_epiz_autor
Dim ID_autor As Integer = CType(gvAutori.Rows(e.RowIndex).FindControl("ddlID_autor"), DropDownList).SelectedValue
Dim funkcija As String = CType(gvAutori.Rows(e.RowIndex).FindControl("txtfunkcija"), TextBox).Text.Trim
DSautori.UpdateCommand = "UPDATE veza_epiz_autor SET ID_autor = " & ID_autor & ", funkcija = '" & funkcija & "' WHERE ID = " & e.Keys(0)
End Sub
Protected Sub gvAutori_RowDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewDeleteEventArgs)
' DELETING RECORD IN THE DATABASE TABLE veza_epiz_autor
DSautori.DeleteCommand = "DELETE FROM veza_epiz_autor WHERE ID=" & e.Keys(0)
End Sub
Protected Sub InsertAutori_Click(ByVal sender As Object, ByVal e As System.EventArgs)
' INSERT NEW RECORD IN THE DATABASE TABLE veza_epiz_autor
Dim ID_epiz As Integer = myID
Dim ID_autor As Integer = CType(FindControl("fvAutori").FindControl("ddlID_autor"), DropDownList).SelectedValue
Dim funkcija As String = CType(FindControl("fvAutori").FindControl("txtfunkcija"), TextBox).Text.Trim.ToString
DSautori.InsertCommand = "INSERT INTO veza_epiz_autor (ID_epiz, ID_autor, funkcija) VALUES (" & ID_epiz & ", " & ID_autor & ", '" & Inc.nav(funkcija) & "')"
' POPULATING FORMVIEW'S DROPDOWNLIST ddlID_autor AGAIN
populate_fvAutori_ddlID_autor()
End Sub
Protected Sub fvAutori_ItemInserting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewInsertEventArgs)
' THIS IS WHERE I ALSO TRIED PLACING ALL THE CODE FROM THE InsertAutori_Click METHOD
End Sub
Protected Sub cbOnOffAutori_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs)
' SHOW/HIDE THE PANEL plAutori (FORMVIEW + GRIDVIEW)
If cbOnOffAutori.Checked Then
populate_fvAutori_ddlID_autor()
plAutori.Visible = True
Else
plAutori.Visible = False
End If
End Sub
</script>
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Sep 15th, 2008, 05:41 AM
#2
Thread Starter
Lively Member
Re: Formview's dropdownlist is not being populated after ItemInserted
...and the 2nd part:
Code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="ROBOTS" content="NOINDEX,NOFOLLOW" />
<meta http-equiv="CACHE-CONTROL" content="NO-CACHE" />
<meta http-equiv="PRAGMA" content="NO-CACHE" />
<title></title>
<link href="unos.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" language="javascript">
function ConfDelete(xx) {
if (confirm(xx)) {return true;} else {return false;}
}
</script>
</head>
<body id="body1" runat="server">
<form id="f1" runat="server">
<uc1:ucMain ID="Inc" runat="server" EnableViewState="false" />
<asp:SqlDataSource ID="DSautori" runat="server" EnableViewState="false" />
<asp:CheckBox ID="cbOnOffAutori" runat="server" Text="Authors:" BackColor="#CCFF66" Font-Bold="True" Font-Size="Medium" Font-Underline="False" AutoPostBack="True" oncheckedchanged="cbOnOffAutori_CheckedChanged" />
<asp:PlaceHolder ID="plAutori" runat="server" Visible="false"><br />
<asp:FormView ID="fvAutori" runat="server"
DataKeyNames="ID" DataSourceID="DSAutori" DefaultMode="Insert"
CellPadding="0" CellSpacing="0" GridLines="None" BorderStyle="None" BorderWidth="0" Width="1"
OnItemInserting="fvAutori_ItemInserting"
>
<InsertItemTemplate>
<table border="0" cellspacing="1" cellpadding="3">
<tr>
<td valign="top" class="headerstyle" align="center" width="200">
<b>Name (integer):</b>
</td>
<td valign="top" class="headerstyle" align="center" width="200">
<b>Function (string):</b>
</td>
<td valign="top" class="headerstyle">
</td><td valign="top" class="headerstyle">
</td></tr>
<tr>
<td valign="top" class="itemstyle">
<asp:DropDownList ID="ddlID_autor" runat="server"></asp:DropDownList>
<br />
</td>
<td valign="top" class="itemstyle">
<asp:TextBox ID="txtfunkcija" runat="server" CssClass="input" EnableViewState="false" />
</td>
<td valign="top" class="itemstyle">
<asp:Button ID="InsertAutori" runat="server" CausesValidation="True" CommandName="Insert" Text=" OK " CssClass="mediumbutton" EnableViewState="false" OnClick="InsertAutori_Click" />
<br />
</td><td valign="top" class="itemstyle">
<asp:Button ID="CancelAutori" runat="server" CausesValidation="False" Text=" Cancel " CssClass="mediumbutton" EnableViewState="false" />
</td>
</tr>
</table>
</InsertItemTemplate>
</asp:FormView>
<asp:GridView ID="gvAutori" runat="server"
DataKeyNames="veza_epiz_autor__ID" DataSourceID="DSautori"
EnableViewState="false" AutoGenerateColumns="false"
EmptyDataText="No records found."
AllowPaging="false" AllowSorting="false"
CellPadding="3" CellSpacing="1" BorderStyle="None" BorderWidth="0" GridLines="None"
OnRowDataBound="gvAutori_RowDataBound"
OnRowDeleting="gvAutori_RowDeleting"
OnRowUpdating="gvAutori_RowUpdating">
<Columns>
<asp:TemplateField HeaderText="name">
<HeaderStyle CssClass="headerstyle" />
<ItemStyle CssClass="itemstyle" />
<ItemTemplate>
<asp:Label ID="lblautor1" runat="server" EnableViewState="false" />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlID_autor" runat="server" EnableViewState="false"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="function">
<HeaderStyle CssClass="headerstyle" />
<ItemStyle CssClass="itemstyle" />
<ItemTemplate>
<asp:Label ID="lblfunkcija" runat="server" EnableViewState="false" />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtfunkcija" runat="server" CssClass="input" EnableViewState="false" />
</EditItemTemplate>
</asp:TemplateField>
<asp:CommandField ButtonType="Button" ShowEditButton="True" EditText=" Edit " UpdateText=" OK ">
<ControlStyle CssClass="mediumbutton" />
<HeaderStyle CssClass="headerstyle" Width="11" />
<ItemStyle CssClass="itemstyle" Width="11" />
</asp:CommandField>
<asp:TemplateField>
<HeaderStyle CssClass="headerstyle" Width="10" />
<ItemStyle CssClass="itemstyle" />
<ItemTemplate>
<asp:Button ID="DeleteButton" runat="server" Text=" Delete " CommandName="Delete" EnableViewState="false" Font-Bold="True" ForeColor="Red" CssClass="mediumbutton" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</asp:PlaceHolder>
</form>
</body>
</html>
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Sep 15th, 2008, 02:09 PM
#3
Re: Formview's dropdownlist is not being populated after ItemInserted
I suggest that you place a breakpoint in your page load and DDL and button click events to have a look at the actual values being passed to and received from the database. When debugging, you can move your mouse over variables and object properties to see the values they hold.
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Sep 16th, 2008, 09:18 AM
#4
Thread Starter
Lively Member
Re: Formview's dropdownlist is not being populated after ItemInserted
 Originally Posted by mendhak
I suggest that you place a breakpoint in your page load and DDL and button click events to have a look at the actual values being passed to and received from the database. When debugging, you can move your mouse over variables and object properties to see the values they hold.
I just did - I haven't found out anything new that I already didn't know... It didn't help 
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Sep 17th, 2008, 12:59 PM
#5
Re: Formview's dropdownlist is not being populated after ItemInserted
So when you did step into the populate_fvAutori_ddlID_autor method, did it retrieve data from the database? Are you getting values when you do a quickwatch on rs("ime").ToString?
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Sep 17th, 2008, 02:11 PM
#6
Thread Starter
Lively Member
Re: Formview's dropdownlist is not being populated after ItemInserted
Originally Posted by mendhak
So when you did step into the populate_fvAutori_ddlID_autor method, did it retrieve data from the database? Are you getting values when you do a quickwatch on rs("ime").ToString?
I dunno... When I mouseover tmpddl1 it says its value is Nothing; mouseover any other part of the method doesn't bring anything... And the Locals window shows only "Me" and "tmpddl1" which is Nothing.
(I state once before I don't know how to use debugging  )
But populate_fvAutori_ddlID_autor method does populate dropdownlist ddlID_autor but only the first time; after insertion it does not populate it... (see the live demo http://www.movie-remakes.com/kp/epiz...SIMPLE_EN.aspx )
And the complete solution should look like this:
http://www.movie-remakes.com/kp/epiz...it_EN.asp?ID=1
(with population of ddlists, enter-key-submission of the proper part of the form etc.)
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Sep 17th, 2008, 02:31 PM
#7
Re: Formview's dropdownlist is not being populated after ItemInserted
Actually, post #4 looks like you are saying you did do debugging. Is the DDL being added dynamically?
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Sep 17th, 2008, 03:13 PM
#8
Thread Starter
Lively Member
Re: Formview's dropdownlist is not being populated after ItemInserted
Originally Posted by mendhak
Actually, post #4 looks like you are saying you did do debugging. Is the DDL being added dynamically?
I did debugging, but haven't found out anything new.
DDL is generated in design time, but its populated dynamically: see the method populate_fvAutori_ddlID_autor()
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Sep 18th, 2008, 07:36 AM
#9
Re: Formview's dropdownlist is not being populated after ItemInserted
My only guess at this point would be that the database isn't returning values.
There's also something else you can do... look at this line:
Dim tmpddl1 As DropDownList = CType(FindControl("fvAutori").FindControl("ddlID_autor"), DropDownList)
fvAutori is a control on the page, inside a placeholder. Do fvAutori.FindControl() or do a placeholderid.findcontrol("fvAutori").FindControl().
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Sep 18th, 2008, 03:14 PM
#10
Thread Starter
Lively Member
Re: Formview's dropdownlist is not being populated after ItemInserted
Originally Posted by mendhak
My only guess at this point would be that the database isn't returning values.
There's also something else you can do... look at this line:
Dim tmpddl1 As DropDownList = CType(FindControl("fvAutori").FindControl("ddlID_autor"), DropDownList)
fvAutori is a control on the page, inside a placeholder. Do fvAutori.FindControl() or do a placeholderid.findcontrol("fvAutori").FindControl().
Thanks for your reply, mendhak. However, it is not the issue:
1) database not returning values
- it returns values for the first time, and not after the postback (iteminserting)
- it returns values for the similar DDL in gridview; the only difference in code is that it sets selectedvalue for the gridview DDL. (see the comment "' POPULATING DDLIST ddlID_autor" in gvAutori_RowDataBound; compared to the method populate_fvAutori_ddlID_autor)
2) referencing plAutori.FindControl("fvAutori").FindControl...
I tried that before, no success. In fact, I learned that you don't have to reference placeholder at all; Gridview gvAutori is in the same placeholder and I don't have to reference it in a way "plAutori.FindControl("gvAutori")", it works without it.
Take a look at this, this is even more simplified - just a formview with the DDL that should be populated over and over again, after each submission (insertion); I wrote the code in the page content:
http://www.movie-remakes.com/kp/_TES...ATASOURCE.aspx
but I managed to solve it only after I removed the datasource out of the picture:
http://www.movie-remakes.com/kp/_TEST_EN.aspx
But I wouldn't call this "resolved" because I don't understand what's wrong with the 1st solution that includes sqldatasource.
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Sep 22nd, 2008, 05:04 AM
#11
Re: Formview's dropdownlist is not being populated after ItemInserted
A little tough to be honest. I can't see why the ddl won't repopulate on postback, I see no postback checks and no dynamically added controls that would possibly cause this to happen.
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Sep 26th, 2008, 07:13 AM
#12
Thread Starter
Lively Member
Re: Formview's dropdownlist is not being populated after ItemInserted
Originally Posted by mendhak
A little tough to be honest. I can't see why the ddl won't repopulate on postback, I see no postback checks and no dynamically added controls that would possibly cause this to happen.
I never thought that I will stumble upon a problem that you can't solve 
But thanks anyway 
(Imagine the puzzled look on my newbie's face when I try to find the reason why this is not happening; so I had to go the other way around)
P.S. You might have noticed that I took your advice and never use <%# ... %>
Last edited by imbrod; Sep 26th, 2008 at 07:21 AM.
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Sep 29th, 2008, 08:54 AM
#13
Re: Formview's dropdownlist is not being populated after ItemInserted
Originally Posted by imbrod
P.S. You might have noticed that I took your advice and never use <%# ... %>
And I'll bet you're kicking yourself now 
As for your problem, if you really want to know why it wasn't working that one particular way, (whenever I run into such a situation) I start the same form from scratch, rewriting it all but with the same technique to see where I went wrong.
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Sep 30th, 2008, 02:11 AM
#14
Thread Starter
Lively Member
Re: Formview's dropdownlist is not being populated after ItemInserted
Originally Posted by mendhak
And I'll bet you're kicking yourself now
As for your problem, if you really want to know why it wasn't working that one particular way, (whenever I run into such a situation) I start the same form from scratch, rewriting it all but with the same technique to see where I went wrong.
Believe me, mendhak, I wrote it 4-5 times from the scratch... I do the same as you do: start all over again. 
But that's how I found the alternate solution without sqldatasource.
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