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see if the extra columns should be added or

here it's defining the columns in a variable which

means that the colgroup columns are incorrect since DataTables

and it totals all columns correctly. However, my data

But the page loads fine and some columns can be sorted. When I type in the name of the item that is shown on the table and search, this error occurs

lists for the desired columns. As suggested by Allan

I just realized that: array versus Editor::inst( $db, 'datatables_demo' ) is probably using php/datatables with editor package; while $columns is probably the normal way? (without using the PHP library?)

You are looking for Responsive rather than FixedColumns. FixedColumns is used for a scrolling table only. Responsive however, will hide columns based on the table width automatically. The documentation for how to prioritise columns is available here. Allan

You can use the columns selector as a function (see column-selector) which would give you

Here is an example: from the table's columns data part: { data: null, render: function ( data, type, row ) { return '<a href="http://cookies.insites.com/" </a>'; } },