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Working with visible rows

I need to check that some condition holds for every cell in a grid. If this condition fails, I must change the background color of the cell.

Because I am using smart rendering, I can't check all cells at once. Instead, I must check this condition every time new data is loaded from server
(using setOnLoadingEnd) and each time the user scrolls (using setOnScrollHandler), since the data isn't put on the grid until it is visible.

The function called when loading ends isn't very useful, because it counts how many rows were loaded, but it doesn't say which, so I don't know
which rows to check. The function called when the user scrolls isn't very useful either, because I don't know which rows are visible.

Because of these problems, I must go through every cell, using a try-catch block in order to detect cells which don't exist yet. This isn't elegant and it
consumes CPU, making scrolling very slow.

Thus, I would like to know whether there is some way to find out which rows are visible, in order to update them only. Or maybe there is another kind of workaround to
this problem. I will hear any suggestions.

Thanks
Jong Bor

To check row visibility next code can be used
    if (this.getRowById(ID)){
       //row exists
    }

Also in your case, if you need validate EACH cell in grid, you can use onCellChanged event, this event fire on each cell modification , including initial loading from XML, so after row loaded in grid by any way it will fire such event for all cells with valur in it.

    grid.attachEvent("onCellChanged",function(rid,cind,val){
    });