Add a filter control to the map

Add a filter control to the map

add_filter_control(map, layer_id, filter = NULL, pos = NULL,
  rows = 1, cols = 20)

Arguments

map	A mapboxer object.
layer_id	The ID of the layer to which the filter is attached.
filter	The initial filter expression.
pos	The position of the control. One of top-left, top-right, bottom-right or bottom-left.
rows	The number of rows of the textarea input.
cols	The number of columns of the textarea input.