How to get value of dynamic control radio button after postback

[ive1122]

Hi guys,

I am looking into create a dynamic survey as posted in Get User Input From Dynamic Controls but with some different environment
Below is what i am trying to do:
First when the user click the button, it will populate a dynamic table with radio button for the survey questionnaire
However, i was unable to get its value (for score calculation) after clicking the submit button
Beside i am using an ajax extension (updatePanel) for the development
I have been look into viewstate but i hv no idea with it.

Does anyone have any ideas?

Here i included some of my code:

part of code in page

 
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:Button ID="btnTest" runat="server" Text="Take Test" OnClick="btnTest_Click" Visible="False" />
                <asp:Label ID="lblTestErrMsg" runat="server" 
 
    ForeColor="Red"></asp:Label><br />
                    <table id="tblTest" runat="server" style="width: 100%">
                        <tr>
                            <td>
                             <asp:PlaceHolder ID="phQuestionnaire" runat="server"></asp:PlaceHolder>
                                <br />
                                </td>
                        </tr>
                        <tr>
                            <td>
                                </td>
                        </tr>
                        <tr>
                            <td>
                                <asp:Label ID="lblResult" runat="server"></asp:Label></td>
                        </tr>
                        <tr>
                            <td>
                            </td>
                        </tr>
                    </table>
                </ContentTemplate>
            </asp:UpdatePanel>
 

Populate Dynamic Table function
* v_dtTable and v_dtTable2 contains the data from database

   Private Sub CreateDynamicTable(ByVal v_dtTable As Data.DataTable, ByVal v_dtTable2 As Data.DataTable)
        Me.phQuestionnaire.Controls.Clear()
        Dim cols As Integer = v_dtTable.Rows.Count + 2
        Dim rows As Integer = v_dtTable2.Rows.Count + 1
        Dim mid As Integer = v_dtTable.Rows.Count / 2
 
        Dim tbl As Table = New Table()
        tbl.ID = "tblQs"
        tbl.BorderWidth = 1
        tbl.CellPadding = 0
        tbl.CellSpacing = 0
        tbl.Width = 500
        tbl.EnableViewState = True
 
        Me.phQuestionnaire.Controls.Add(tbl)
        For i As Integer = 0 To rows - 1
            Dim tr As TableRow = New TableRow()
            Dim rowCnt As Integer = 1
            Dim colCnt As Integer = 0
 
            For j As Integer = 0 To cols - 1
                Dim tc As TableCell = New TableCell()
                tc.BorderWidth = 1
                Dim lbl As Label = New Label()
                Dim bol As Boolean = False
 
                If i = 0 Then       
                    If j = 0 Then
                        tc.Text = "No."
 
                    ElseIf j = 1 Then
                        tc.Text = "Question"
 
                    Else
                        tc.Text = v_dtTable.Rows(j - 2).Item("scoreName")
                        tc.HorizontalAlign = HorizontalAlign.Center
                    End If
                    tc.BackColor = Drawing.Color.DeepSkyBlue
                    tc.ForeColor = Drawing.Color.White
                Else
                    If v_dtTable2.Rows(i - 1).Item("isHeader") Then
                        bol = True
                        tc.Text = v_dtTable2.Rows(i - 1).Item("TestQuestion")
                        tc.Style("font-weight") = "bold"
 
                    ElseIf j = 0 Then
                        tc.Text = rowCnt
                        rowCnt += 1
 
                    ElseIf j = 1 Then
                        tc.Text = v_dtTable2.Rows(i - 1).Item("TestQuestion")
 
                    Else
                        Dim rBtn As RadioButton = New RadioButton
                        rBtn.GroupName = "rBtn" & rowCnt
                        rBtn.ID = "rBtn_" & rowCnt & "_" & colCnt
                        rBtn.InputAttributes("value") = v_dtTable.Rows(j - 2).Item("scoreValue")
                        colCnt += 1
                        If j = mid + 2 Then
                            rBtn.Checked = True
                        End If
 
                        tc.Controls.Add(rBtn)
                        tc.HorizontalAlign = HorizontalAlign.Center
                    End If
                End If
 
                If bol Then
                    tc.ColumnSpan = cols - 1
                    tr.Cells.Add(tc)
                    Exit For
                Else
                    tr.Cells.Add(tc)
                End If
            Next j
 
            tbl.Rows.Add(tr)                              
        Next i
 
    End Sub
 

Calculate Score function

        Private Sub subCalculateScore()
        Dim tblQs As Table = CType(Me.phQuestionnaire.FindControl("tblQs"), Table)
        Dim rb As New RadioButton
        Dim score As Integer = 0
 
        If Me.phQuestionnaire.FindControl("tblQs") Is Nothing Then
        Else
            For Each tr As TableRow In tblQs.Rows
                For Each tc As TableCell In tr.Cells
                    For Each c As Control In tc.Controls
                        If c.GetType.ToString = rb.GetType.ToString Then
                            Dim rBtn As RadioButton = CType(c, RadioButton)
                            If rBtn.Checked Then
                                Dim strScore As String = rBtn.InputAttributes("value")
                                score += CInt(strScore)
                            End If
                        End If
                    Next
                Next
            Next
        End If
 
        Me.Label1.Text = score
    End Sub
 

[sharifee]

create only one hidden field . if u know XML then it is very easy. just write XML tags to hidden field and you can access every value or attribute of the tag you have written to hidden field.

[Gaigoi]

Thank! Im using the placeholder to solved my question.

[Frinavale]

I have no idea what your problem was, but typically you don't need to use a hidden field in order to determine the value of a radio button. A "place holder" in asp.net wouldn't really help you either since a placeholder is a container used to store server controls that are dynamically added to the Web page.

I'm assuming that you've solved your mysterious problem but I just wanted to make sure that whatever you've done isn't going to confuse someone else looking for help with retrieving the value of a dynamically created radio button.

Normally you would use the FindControl method to retrieve the dynamically created radio button (or any dynamically generated control). Once you have retrieved the dynamic control you can retrieve it's value.

-Frinny