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How to update an existing row with one call?

Hi,
I know we can update a grid cell by going grid.cell(rowId,ColIndex).setValue( newValue); But if we need to update all cells in a row this method is slow and not practical. I tries calling grid.loadXMLString( rowXML) passing the same rowId but it ended up add the row and not updating the existing one.

Is there a better way to update the entire row?

Thanks
Dhafir @ Honad

There is an inner method, which can be used for it
    grid._fillRow(grid.getRowById(ID),data);
where data - array, or comma separated string of values

>> all cells in a row this method is slow and not practica
Actually, while it may look complex, this method is not so slow, to simplify code you can use
    var data=[.....]
    grid.forEachCell(ID,function(c,i){
       c.setValue(data[i]);
    });