markSorting

marks the sorted column with arrow (asc/desc) in the header

void markSorting( [string column_id,string direction,boolean preserve] );

column_id	string	optional, the column ID
direction	string	optional, the sorting direction: "asc" or "desc"
preserve	boolean	optional, instructs to preserve previous sorting marker

dtable = webix.ui({view:"datatable", ...})
 
dtable.markSorting("title", "asc");

Details

The method is designed for placing correct arrows in headers if the data have been sorted programmatically.

dtable.sort("title", "asc");
dtable.markSorting("title", "asc");

The method can be called with no parameters to remove all arrows from the datatable headers.