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The hh:mm:ss should just be the output format of that column's raw data. So you should be able to have your own functionality summing up the raw data for that column.

my javascript, I had: "columns": [ {"data" : "OKIID"} and so

you have 5 * 300px columns, then why set the

now with the hidden columns. But there will be

the problem in using columns: [] when i remove it

items to the order" }, "columns" : [ { "data": "groupcode", "orderable" : false,

I'm only an user from datatables. But I had search for retrieving hidden values. And I found a script maybe you can use to retrieve normal columns. The first part can be needed for problems with pagination. https://datatables.net/forums/discussion/35210/jquery-doesnt-take-hidden-td#latest

your code for a column's render callback you have:

For tables with 10 columns or so, the standard

As @doncullen says, there is ColReorder for drag and drop of columns. But it is individual columns only - there is no option for grouped columns at this time. Allan