Leaflet in R plotting icons unpredictably

Question

My Shiny app takes a dataframe like this:

and subsets appropriately by allowing the user to select a person (P1_name) and a date (date

Answer 1

One of the issue could be that you are adding empty markers in your subsets and leaflet reacts strangely to that.

For example, when you select Joe Blow, all the subsets for P1_outcome == "W", "L" or "D" are empty.

As described here, you could use the iconList function to change the icons depending on P1_outcome and remove all the subset.

You could for example add:

icon_list <- iconList(W=icon_W,L=icon_L,D=icon_D,N=icon_N)

right after you define all the icons, and use:

m <- leaflet(DF) %>%
      addTiles() %>%  # Add default OpenStreetMap map tiles
      setView(lat=setzoom[1], lng=setzoom[2], zoom=zoom_num) %>%
      addMarkers(lat=DF$lat, lng=DF$lon,icon= ~icon_list[DF$P1_outcome]) 

to create your map.