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Detecting Checked Checkboxes in DataGrid

Detecting Checked Checkboxes in DataGrid

Detecting Checked Checkboxes in DataGrid


I've been unable to determine which CheckBoxes are being 'checked' within a DataGrid.  The following code iterates through the entire datagrid, but never identifies the checked checkboxes.


Sub OnCheckOut( s As Object, e As EventArgs )
  Dim i As Integer
  Dim blnIsChecked As Boolean    
  For i = 0 to dgrd_EmailUpdate.Items.Count - 1
    blnIsChecked = DirectCast(dgrd_EmailUpdate.Items(i).Cells(4).FindControl("chkSelected"), Web.UI.WebControls.CheckBox).Checked            
      If blnIsChecked = True Then
                response.write( i & " IS Checked <BR>")
                response.write( i & " IsNotChecked ")
      End If            
End Sub

Here is the datagrid I'm using as well as the button to kick things off.


<asp:DataGrid ID="dgrd_EmailUpdate"
    AutoGenerateColumns="False" Runat="Server">        <Columns>
     <asp:BoundColumn DataField="ID" HeaderText="ID" />
     <asp:BoundColumn DataField="EmailAddress" HeaderText="Email Address" />
     <asp:BoundColumn DataField="IPaddress" HeaderText="IPAddress" />
    <asp:BoundColumn DataField="datetime" HeaderText="DateTime"    HeaderStyle-Width="100" />
    <asp:TemplateColumn HeaderText="Remove"
             <TD align="center">
            <asp:CheckBox id="chkSelected"  runat="server" />            

<asp:Button Text="btnRemove" style="FONT:8pt Verdana; WIDTH: 100px" OnClick="OnCheckOut" RunAt="server" />            

Clearly I'm missing something, but obviously I'm not bright enough to figure it out.

I greatly appreciate any help you can provide.


RE: Detecting Checked Checkboxes in DataGrid

you could cast your control to a checkbox and test the the checked property.
never tried casting the value of a checkbox to a boolean


Sub OnCheckOut( s As Object, e As EventArgs )
  Dim i As DataGridItem
  For Each i In dgrd_EmailUpdate.Items
    Dim cb_Selected As CheckBox = CType(i.FindControl("chkSelected"), CheckBox)
      If cb_Selected.Checked Then
          response.write( i & " IS Checked <BR>")
          response.write( i & " IsNotChecked ")
      End If            
  Next i       
End Sub

RE: Detecting Checked Checkboxes in DataGrid

In the debugger, does your code successfully find the CheckBox (though not its value)? Do you re-bind before checking values?

RE: Detecting Checked Checkboxes in DataGrid

Yes, the checkbox is found.  Turns out that both options above work perfectly.  The only requirement (which I somehow overlooked multiple times) is that re-binding the datagrid NOT occur with each postback (duh!), so I had to include the binding in an "If NOT IsPostBack" condition within Page_Load().

Case closed!


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