Update a Select List with Column Names

Usage

update_selectize_variables(
  id,
  x,
  find = NULL,
  use = NULL,
  selected = NULL,
  preserve = TRUE,
  none = TRUE,
  server = TRUE
)

id: A character string specifying the namespace (must match selectize_ui()).
x: A reactive matrix-like object.
find: A predicate function for column selection (see arkhe::detect()).
selected: A character vector specifying the initially selected value(s).
preserve: A logical scalar: should existing selection be preserved on update?
none: A logical scalar: should a placeholder be added as the first element?
server: A logical scalar: should server-side selectize be used?

A reactive character vector of column names.