How to read values from dynamicly created controls when posted back?????

It seemed a good idea, making an “inquiry-tool”; users can put their questions + the way to answer (eg radiobuttons or textfields) into a database. Answers are written back into the same database.

Using a placeholder I managed to get dynamicly user-written questions + ways-to-answer to the client-side. But here is the problem:
How to read values from dynamicly created controls when posted back?????
I really tryed very hard but I can’t. ........
Can anyone help me please??

Here’s my code:

<%@ Page Language="VB" Debug="true" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.Data.OleDb" %>
<script runat="server">

Sub Page_Load(Sender As Object, e As EventArgs)

if not ispostback then
end if

End Sub


Sub FillTheForm

Dim connFillTheFormStr as string = ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=") & (server.mappath("\InquiryTest1.mdb"))
Dim connFillTheForm= New OleDbConnection (connFillTheFormStr)

Dim strSQL as string="SELECT * FROM tblInquiryQuestions"
Dim cmdFillTheForm = New OleDbCommand(strSQL,connFillTheForm)
Dim rdrFillTheForm as OleDbDataReader = cmdFillTheForm.ExecuteReader

Dim myNumberOfQuestions as Integer
Dim myLit as literal = new literal
Dim myLitTekst as String


myNumberOfQuestions=myNumberOfQuestions+1 'used to make a groupname

'writing a introduction, if any
if rdrFillTheForm.Item("IntroductionText")&""<>"" then
myLitTekst=("<tr bgcolor=#FFCC00>" & vbCrLf)
myLitTekst+= ("<td colspan=2 align=left valign=top>" & rdrFillTheForm.Item("IntroductionText") & "</td>" & vbCrLf)
myLitTekst+=("</tr>" & vbCrLf)
end if

'writing the question
myLitTekst+=("<tr bgcolor=#FFCC00>" & vbCrLf)
myLitTekst+= ("<td align=left valign=top>" & rdrFillTheForm.Item("Question") & "</td>" & vbCrLf)
myLitTekst+= ("<td align=left valign=top>"& vbCrLf)
'in placeholder

'question-type; only radiobutton is worked out, others types of questions = other controls :
If rdrFillTheForm.Item("Vraagtype") = "radiobutton" then
dim myRadioButton as radiobutton
dim myCounter as integer
dim myAantalChoicemogelijkheden as integer = rdrFillTheForm.Item("AantalChoicemogelijkheden")

for myCounter = 1 to myAantalChoicemogelijkheden
myRadioButton = new radiobutton() = myCounter
myRadioButton.groupname="Vraag"& myNumberOfQuestions
myRadioButton.text="" & rdrFillTheForm.Item("tekstbijChoice" & myCounter)
myLit= new literal
myLit.text=("<br>"& vbcr)

end if

myLit= new literal
myLitTekst= ("</td>" & vbCrLf & "</tr>" & vbCrLf)

End While

myLit= new literal
myLitTekst=("<tr bgcolor=#FFCC00><td colspan=2 height=10></td></tr>" & vbCrLf)
'table-row button
myLitTekst+=("<tr bgcolor=#FFCC00><td align=right colspan=2 height=10>" & vbCrLf)

'button:doesn't work too: no event
'Dim myButton As Button = New Button()
'myButton.Text = "ready"
'AddHandler mybutton.Click, AddressOf btnDone_Click

myLit= new literal
myLitTekst=("</td></tr>" & vbCrLf)
'in control stoppen


end sub


Sub btnDone_Click(sender As Object, e As System.EventArgs)

Dim connSaveTheAnswersStr as string = ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=") & (server.mappath("\InquiryTest1.mdb"))
Dim ConnSaveTheAnswers= New OleDbConnection (connSaveTheAnswersStr)

Dim intNumberRows as Integer
Dim strSQL as String

Dim Control as Control
Dim I as Integer
Dim Choice as string

For Each control In Page.Controls
Dim myControl1 As Control = FindControl("vraag"&I)
If (Not myControl1 Is Nothing)

'Choice= CType(Controls(0), myControl1).Text

strSQL="INSERT INTO tblInquiryAnswers (" & _
"Question, " & _
"Answer " & _
") VALUES ('" & _
"','This is my problem','I really don't know!')"

Dim cmdSaveTheAnswers as New OleDbCommand(strSQL,ConnSaveTheAnswers)

Catch ex as exception
End Try


End If

lblOK.text= (intNumberRows & " answers are written")

end sub

<form runat="server">
<table class="tabel" cellspacing="1" cellpadding="2" width="100%" border="0">
<asp:PlaceHolder id="PlaceHolder1" runat="server"></asp:PlaceHolder>
<asp:Button id="Button1" onclick="btnDone_Click" runat="server" Text="Verzend"></asp:Button>
<asp:Label id="lblOK" runat="server"></asp:Label><asp:Label id="lblWrong" runat="server"></asp:Label>
2/5/2004 10:50:00 AM 93655 articles. 5 followers. Follow

2 Replies

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I'm not a code inline person but one thing you must always do with dynamically loaded controls is to create them on every request using the same control names.

Drop the IsPostBack chack and always call your FillTheForm method.
Mike Schellenberger - MCAD
2/5/2004 12:49:14 PM
To restore the state of dynamically created controls, you must create them every time (but populate them only on the first load). The controls must be created in the same order and have the same ID for it to work (although some people say its not necessary). I would recommend using Denis Bauer's DynamicPlaceHolder which does all this for you.
2/5/2004 2:22:42 PM

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