I must be missing something. When I try the first way (FieldName) it aways returns '' . The second way gives a nil for the field object. I am using the HTMLTemplate to display the fields, does that have something to do with it?
I found a partial way to make this work. AutoCreateColumns is false, so I create the columns. I was only setting the HTMLTemplate property when creating the column. I added the setting of the FieldName property also and now the FieldName property is not blank.
And I can also access a TField object as described above. But it appears that the TField object always points to the first record.
I need to be able to access the value of a cell from within the OnGetCellLayout event. For example if the payment status is unpaid I want to change the background color for that cell.
What you can do is set the active record before accessing the data, please see the complete same based on the biolife.xml database inside a TClientDataSet
TTMSFNCGridDataBaseAdapterOpen = class(TTMSFNCGridDatabaseAdapter);
procedure TForm13.TMSFNCGrid1GetCellLayout(Sender: TObject; ACol, ARow: Integer;
ALayout: TTMSFNCGridCellLayout; ACellState: TTMSFNCGridCellState);
ar, c, r: Integer;
r := ARow;
if (r <= TMSFNCGrid1.FixedRows - 1) then
c := ACol - TMSFNCGrid1.FixedColumns;
if (c >= 0) and (c <= TMSFNCGrid1.Columns.Count - 1) then
d := TTMSFNCGridDataBaseAdapterOpen(TMSFNCGridDatabaseAdapter1);
if d.CheckDataSet then
ar := d.DataLink.ActiveRecord;
f := d.FieldAtColumn[c];
if Assigned(f) then
i := 0;
if TryStrToInt(f.AsString, i) then
if i > 50 then
ALayout.Fill.Color := gcRed;
d.DataLink.ActiveRecord := ar;
I plugged the code above into my test program. The TField (f) is always nil. In my situation I create the columns manually and use a DatabaseAdapter. I also tried using the Autocreate = true for the columns, still got a nil for the TField object.
Also of note, is I create the TMSFNCGridDataBaseAdapter in code then set the appropriate properties. The grid is dropped on the form at design time, but everything else is created, set and connected at runtime.
We have tested the code here, which is working as expected. What you could also do is access the field from the dataset instead of going through the database adapter. It's the same field, you just need to access it with the correct column index.
For access outside of the database adapter, this is what I initially tried. The "row" accessed is always the first record in the query/table. I would need to use the ARow to somehow navigate to the correct record.
Maybe if you could sent a complete demo (I don't see one in your stock demos) for using the adapter this way I could see what I'm doing wrong.
There is a database adapter demo in the public documents\tmssoftware\TMS FNC UI Pack Demos folder. I have manipulated the TClientDataSet demo that uses the field approach and the code snippet I posted above.
Thanks for the Demo, that helped a lot. I found out why it wasn't working for me. It has to do with manually creating the columns and using the HTMLTemplate property for the columns. I have modified the demo you sent to reflect the problem. I'm not sure what to do next because I want to use the HTMLTemplate.
This is by design. The function FieldAtColumn ignores the FieldName & Field, because theoretically the HTMLTemplate can contain multiple fields. You can use the Field property instead, directly at column level:
Correct. ActiveRecord synchronisation is necessary to loop through the data of the visible rows, and then resets its back to the actually first record in the buffer. CheckDataSet is used to make sure the dataset is active, and connected to the grid database adapter