Attached please find a copy of the oml. Thanks

I'm working on js, but it's pretty hard now, not yet have solution, 

but the solution that add the blank text and for 0 value into dropdown option still works, should you use this solution.

This is an old solution, Anyway, it didn't work. 

Hi @Edward Muratov 

I was able to achieve that by adding the following script to the Grid Initialize event handler:

const flexGrid  = OutSystems.GridAPI.GridManager.GetGridById($parameters.GridId).provider;

flexGrid.formatItem.addHandler((s, e) => {
    let row = s.rows[e.row],
    col = s.columns[e.col];
    
    //update cell value for Number type columns only
    if (
      e.panel.cellType  === wijmo.grid.CellType.Cell &&
      (
        (col.binding === 'Sample_Product.Price' && row.dataItem.Sample_Product.Price === 0)
        ||
        (col.binding === 'Sample_Product.Stock' && row.dataItem.Sample_Product.Stock === 0)
      ) &&
      !s.editRange // ignore cell content update while editing
    ) {
      e.cell.textContent = '';
    }
});

Result:

Hope it helps!

Cheers,
GM

Hi Gonçalo Martins! Unfortunately, this code doesn't work for me. Thanks

Hi @Edward Muratov 

Could you at least expand a bit more on "this code doesn't work for me" and share an example of your implementation?

Cheers,
GM

Attached please find my oml.

@Edward Muratov that OML has more than 100 errors due to missing dependencies so please isolate your Grid page. 

Also, you didn't mention which type of columns you mean so the example is for Number columns since the Dropdowns already have that behavior by default unless you have some bad data.

Here's a sample OML with this working, so check it working with both Number Columns affected by the code I gave and dropdowns with the default behavior: 

Please check if your bindings are correct, as I can't replicate anything without having your app in runtime.