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When I  programmatically open a datagrid row in edit mode my dropdown in the edittemplate does not show.

Posted on 2009-07-09
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Last Modified: 2013-11-07
I have a datagrid with a radiobutton and several other columns of data.  When the user clicks a radio button that selected row is programmatically put into edit mode, one of the columns has a dropdown which is located in an EditItemTemplate but the drop down does not show it only shows as a textbox.  Does any one have an idea why the dropdown doesnt show?
ASPX Page
 
<asp:DataGrid TabIndex="3" id="dgPeople" runat="server" CellSpacing="2" GridLines="None" BorderColor="#666699" BorderWidth="1px" AutoGenerateColumns="False" AllowSorting="True" AllowPaging="False" Width="100%">
<Columns>
<asp:TemplateColumn ItemStyle-HorizontalAlign="Center" HeaderStyle-Width="10%" ItemStyle-Width="10%" HeaderStyle-CssClass="clsGridHeaderText" HeaderStyle HorizontalAlign="Center">
  <HeaderTemplate>					<font color="#165A8E">&nbsp;Select&nbsp;</font>
</HeaderTemplate>
<ItemTemplate>
  <asp:RadioButton ID="radSelect" OnCheckedChanged="SelectOnlyOne" GroupName='<%# DataBinder.Eval(Container, "DataItem.UserID")%>' AutoPostBack="True" Runat="server"></asp:RadioButton>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="First Name" HeaderStyle-CssClass="clsGridHeaderText" 
SortExpression="FirstName" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Left" HeaderStyle-Wrap="False" ItemStyle-Wrap="False">
<ItemTemplate>&nbsp;
<asp:Label id="lblFirstName" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.FirstName")%>' ></asp:Label>
</ItemTemplate>
<EditItemTemplate>
                            <asp:TextBox runat="Server" id="txtFirstName" Text='<%# DataBinder.Eval(Container.DataItem, "FirstName")%>' />
                          </EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Discipline" HeaderStyle-CssClass="clsGridHeaderText" SortExpression="Discipline" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center" HeaderStyle-Wrap="False" ItemStyle-Wrap="False">
<ItemTemplate><asp:Label ID="discipline" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Discipline")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>						  <asp:DropDownList id="drpDiscipline" runat="server">			 <asp:ListItem Value="1">Physical Therapist</asp:ListItem>
 <asp:ListItem Value="2">Recreational Therapist</asp:ListItem>
<asp:ListItem Value="3">Registered Nurse</asp:ListItem>
<asp:ListItem Value="4">Occupational Therapist, Registered</asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
 
VB Code Behind
 
THIS IS CALLED WHEN USER CLICKS ON A RADIO BUTTON
Public Sub SelectOnlyOne(ByVal sender As Object, ByVal e As System.EventArgs)
 
      Dim pDTPeople As DataTable
     'THIS IS WHERE THE ROW GETS PUT INTO EDIT MODE BASED ON A ROW INDEX
     'RETURNED BY SETRADIOBUTTON
      'Call SetRadioButton the first time to get the row selected
      dgPeople.EditItemIndex = SetRadioButton(sender, e)
 
      'Load the data from ViewState in to the Dataset object.
      gfpSaveOrLoadGridViewState(pDTPeople, dgPeople.ID, "LOAD")
 
      'Fill datagrid with data stored in session with corresponding pageindex.
      Call mfpBindGrid(False, 0, pDTPeople, True)
 
      'Call SetRadioButton a second time to set the selection on the radio button
      SetRadioButton(sender, e)
 
 End Sub
 
Private Function SetRadioButton(ByVal sender As Object, ByVal e As System.EventArgs) As Integer
 
      Dim intRow As Integer = -1
 
      Dim m_ClientID As String = ""
      Dim rb As New RadioButton
 
      rb = CType(sender, RadioButton)
      m_ClientID = rb.ClientID
      rb = CType(sender, RadioButton)
      m_ClientID = rb.ClientID
 
      For Each i As DataGridItem In dgPeople.Items
        rb = CType(i.FindControl("radSelect"), RadioButton)
        rb.Checked = False
        If (m_ClientID = rb.ClientID) Then
          rb.Checked = True
 
          Response.Write(rb.GroupName & "<BR>")
          intRow = i.ItemIndex
        End If
      Next
 
      Return intRow
 
    End Function

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Question by:udsmr
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3 Comments
 
LVL 18

Expert Comment

by:carlnorrbom
ID: 24824304
Hi,

I don't have access to my dev box at the moment, but what if you added an eval to bind the selected item for the dropdown? See code.

/Carl.
<asp:TemplateColumn HeaderText="Discipline" HeaderStyle-CssClass="clsGridHeaderText" SortExpression="Discipline" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center" HeaderStyle-Wrap="False" ItemStyle-Wrap="False">
    <ItemTemplate>
        <asp:Label ID="discipline" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Discipline")%>'>
        </asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:DropDownList id="drpDiscipline" runat="server" SelectedItem='<%# DataBinder.Eval(Container, "DataItem.Discipline")%>'>
            <asp:ListItem Value="1">Physical Therapist</asp:ListItem>
            <asp:ListItem Value="2">Recreational Therapist</asp:ListItem>
            <asp:ListItem Value="3">Registered Nurse</asp:ListItem>
            <asp:ListItem Value="4">Occupational Therapist, Registered</asp:ListItem>
        </asp:DropDownList>
    </EditItemTemplate>
</asp:TemplateColumn>

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Author Comment

by:udsmr
ID: 24826342
That didn't work.  I was running several other tests and it looks like when you click the radio button to put the row into edit mode it doesn't actually load the controls that are in the EditItemTemplate it loads what looks like textboxs (no dropdown).  I was working on the same page with a second datagrid  this new grid caused a post back and the 1st grid referenced above reloaded and the drop down showed but the data in the grid was missing because the data was not reloaded during this postback.
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Accepted Solution

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udsmr earned 0 total points
ID: 24853766
I moved on and reworked my page never came up with a solution
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