This R code demonstrates adding leaflet-groupedlayercontrol that extend layer grouping and selection. This provides a ton of flexibility in determining which layers are shown. Have a look at the output folder if you would like to view the interactive map in a browser without running code.
To output, I make use of htmlwidgets::saveWidget() which saves the leaflet map to HTML along with various supporting files. This makes it easy to throw the resulting map up on a web server.
The leaflet-groupedlayercontrol add-on provides a nice solution for grouping overlay layers. You can:
- Create exclusive group (handy for only showing just one choropleth overlay at a time,
- Create multiple grouped layers.
- Ability to have multiple group titles shown in the layer menu.
- Able to toggle all group layers on or off with a single checkbox click.
- Able to toggle individual layers on or off.
Closeup of the grouped layer control menu in this example map.
Screenshot showing part of map and layers selected.
