How to expand all rows when the page onload?

I successfully implemented the show/hide rows datatable which is the same example as "DataTables server-side processing example with hidden row information". However, the example only shows when user clicks then all of the hidden rows get expanded. When page gets loaded the first time, all of the hidden rows collapsed.

Can someone give me an example if I want all of the hidden rows get expanded when the page gets loaded? I would like to have an expanded rows when the page gets loaded.

Thanks for any feedback!