Sort_dir
determines the different ways in which the rows can be sorted
(e.g. ascending and descending).
next
cycles through sort directions. This is used to determine how to
update the sort direction when a header is clicked on.
indicator
and class_
convert the sort direction and precedence of a column from
the sort criteria into a string symbol and a css class respectively in order to
display sort information in the table.
indicator
returns a symbol that is displayed in the header of the corresponding
column, while class_
returns a css class that is assigned to the header element.
The precedence
is always a positive integer (i.e. it starts at 1, not 0).
A column that is not in the sort criteria is assigned an indicator
and class_
of
None
.
Examples of suitable indicators are:
val indicator : t ‑> precedence:int ‑> string option
val class_ : t ‑> precedence:int ‑> string option