It looks like DataTables supports multi-level grouping: https://datatables.net/extensions/rowgroup/examples/initialisation/multipleGroups.html
In their example, they use this javascript code:
rowGroup: {
dataSrc: [ 2, 1 ]
I've tried to use an array of column numbers in KoolReports by using this code:
"rowGroup"=>array(
"dataSrc"=>[0,1])
But the result is completely off. I can use a single column id and the grouping works fine.
In this example, column 0 holds the task status and column 1 holds the task name.
TIA for any help.
Rooze