>>Given the following HTML fragment, how can I clear the checkmark, in the checkbox with id = "checkAll", in code behind? I can get e reference to the containing grid with:
>>
>>
DirectCast(Page.FindControl("dgListItems"), DataGrid)>>
>>but I can't figure out how to get a reference to the checkbox in the HeaderTemplate in the ColumnTemplate.
>>
>
>If you're doing this from an event of the checkbox, you can just use:
>
>
>CheckBox check = sender as CheckBox;
>if (check != null)
> check.Checked = true;
>
>
>If it's from some other event handler, or just in something like a normal postback, you can't do this directly. Actually, I don't think they expose a FindControl for that kind of thing (at least, I didn't see one). You could do this yourself though by traversing the Controls collection of the grid:
>
>
>CheckBox check = this.FindGridControl(this.grdSample.Controls, "checkAll") as CheckBox;
>if (check != null)
> check.Checked = true;
>
>protected Control FindGridControl(ControlCollection control, string controlName)
>{
> Control matchingControl = null;
>
> foreach (Control subControl in control)
> {
> if (subControl.ClientID.EndsWith(controlName))
> return subControl;
>
> matchingControl = this.FindGridControl(subControl.Controls, controlName);
> if (matchingControl != null)
> break;
> }
>
> return matchingControl;
>}
>Hi Paul
Thanks for pointing me in the right direction. Here is what I came up with (VB Version)
Dim chkTemp As CheckBox = DirectCast(Me.FindMyControl(DirectCast(dgTemp, Control), "checkAll"), CheckBox)
If Not chkTemp Is Nothing Then
chkTemp.Checked = False
End If
Private Function FindMyControl(ByRef ControlToSearch As Control, _
ByVal controlID As String) As Control
Dim matchingControl As Control = Nothing
Try
For Each subControl As Control In ControlToSearch.Controls
If ((Not subControl.ID Is Nothing) AndAlso (subControl.ID.EndsWith(controlID))) Then
matchingControl = subControl
Exit For
Else
If (Not matchingControl Is Nothing) Then 'found it
Exit For
ElseIf subControl.HasControls() Then
matchingControl = Me.FindMyControl(subControl, controlID)
End If
End If
Next
Catch objEx As Exception
Finally
FindMyControl = matchingControl
End Try
End Function
