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I have tested this and the reason I asked the question is that it seems to be doing different things for different tables.
I couldn’t find any documentation on if this is configurable or not. I would have thought it would add the rows to the bottom, but I have a few examples where I see it adding rows at the top or even in the middle sometimes. It seems quite random.
Any ideas?
I have looked at the source code and fnAddData calls the internal method _fnAddData, which adds one row and if successful, returns its index in the table. _fnAddData adds the new row at the bottom (the index of the new row equals the number of the rows in the table).
However, fnAddData has an optional parameter to redraw the table taking into account the various features which are enabled. This parameter defaults to true and this is what probably causes the ‘random’ behavior.