So, this is the code I have in a post-submit callback from a form using ajaxForm:

function UpdateFormFinished(response, statusText, xhr, $form) {



    if (response['bResult'] == true) {



        var sTestType = $(#sTestType).val();

        var sTableId = ;



        for (index in response) {



            if (typeof response[index] !== function && index != bResult && index != sResult) {



                aRowIdPieces = index.split(_);

                sChar = aRowIdPieces[1];



                iColumn = $(# + index).prevUntil(index).length;

                sTableId = $(# + sTestType + _ + sChar).parent().parent().attr(id);



                oTable = $(# + sTableId).dataTable();

                oTable.fnUpdate(response[index], $(#ixDataTable).val(), iColumn);

            }

        }

    }



    alert(response['sResult']);



    $(#dialog_test_details).dialog(close);

}

The first line after the if retrieves a value from a hidden input in the form itself. The variable index will have a value of someWord_X, where X is an integer. iColumn stores the index of the column/cell I want to update (I am aware the numbering starts at zero, which means that prevUntil returns the index of the column/cell I want to update). Finally, ixDataTable is another hidden input on the form and returns an integer (I have verified this using console.log to output that value).

So, from everything I can see, I am passing good values in to fnUpdate, but I am getting the error Cannot read property 'nTr' of undefined. I have looked at the stack trace and the problem starts at line 6188 in dataTables (v1.9.4), which is this line:

_fnGetTdNodes( oSettings, iRow )[iColumn].innerHTML = sDisplay;

The stack trace proceeds to line 4661 and I have copied lines 4660 to 4689 here:

            oData = oSettings.aoData[iRow];

            if ( oData.nTr !== null )

            {

                /* get the TD child nodes - taking into account text etc nodes */

                anTds = [];

                nTd = oData.nTr.firstChild;

                while ( nTd )

                {

                    sNodeName = nTd.nodeName.toLowerCase();

                    if ( sNodeName == 'td' || sNodeName == 'th' )

                    {

                        anTds.push( nTd );

                    }

                    nTd = nTd.nextSibling;

                }



                iCorrector = 0;

                for ( iColumn=0, iColumns=oSettings.aoColumns.length ; iColumn<iColumns ; iColumn++ )

                {

                    if ( oSettings.aoColumns[iColumn].bVisible )

                    {

                        anReturn.push( anTds[iColumn-iCorrector] );

                    }

                    else

                    {

                        anReturn.push( oData._anHidden[iColumn] );

                        iCorrector++;

                    }

                }

            }

Any suggestions for how to fix this are greatly appreciated and will be attempted. I have verified the table id is correct and I have also tried incrementing the column index by 1 and neither of these things has had a positive impact. I have also tried passing in:

ixDataTable = sTestType + _ + sChar;

as the second argument for fnUpdate, but it did not like receiving the id of the row to be updated, either.

Thank you in advance and hopefully it is a very simple fix.