Center texte with double header

ECEGROUPE

Link to test case : https://live.datatables.net/piqukeje/5975/edit

As you can see, the first row of the double header isn't center (Test1 and Test2) but all other row are center,correclty why ?

I m using the basic code to center text inside datatable : "columnDefs": [{"className": "dt-center", "targets": "_all"}]

Thx for your time / answer

kthorngren

Datatables only applies the columns.className to the header row that it applies the sorting event handlers to. It doesn't do anything with the other header rows. You can apply the classname to the th tag directly, like this:
https://live.datatables.net/jisowogi/1/edit

Kevin