I was working in the right area, with afterSubmitCell event, but couldn't work out how to catch the response correctly.

It would help if the examples showed something like this.

Thanks again, dj

        afterSubmitCell: function (serverresponse, rowid, cellname, value, iRow, iCol) {
               var mymess = serverresponse.responseText;
               var retbool = true;
               if (mymess != '1') { retbool = false; }
             var myret = [retbool,mymess];
               return myret;
        },

I make sure that my server update routines return a '1' if all goes well, otherwise they return an error message that explains what the problem is.  Then the grid will put up a dialog error with the returned message and nothing is changed in the cell.

To me, it is not clear from the documentation or examples what the server should return in response to cell edit ajax requests. I can submit and perform a database update okay, but if there is a database error, what ever I return from the server, the grid updates. The only way I have found to display an error is to set the HTTP response code to 400 or 500 range, but can return no useful error message.

How do I return a meaningful server error and display it?

Using php & JSON the best I can work out from the documentation is something like this, is this correct?

 echo json_encode(array(false, 'Update Failed'));

If so, how do I catch and display the error and prevent the grid from updating? Otherwise, what am I doing wrong.

Thanks, dj