Creating label in leaflet map using htmltools produces tiny label - html

Question

Creating a leaflet map. First step, specify the label. The code used on leaflet github puts
%>% lapply(htmltool::HTML)
after the sprintf() function. However, making it is creating the label as a type:"list" resulting in the error: "Error in sum(sapply(label, function(x) { : invalid 'type' (list) of argument"
So to try and get around this I just load the htmltools library and use the code
HTML(sprintf(...))
Doing this works and runs the map, however, the labels show up as small boxes with no information (see picture link below)
I can't tell if this is something to do with the code inside sprintf() or if this has to do with HTML().
The weird thing is that the %>% lapply method was working just fine, but something happened and now its giving the error mentioned above
Image with the small label shown as little white box
labels.dest2 <- sprintf("<div style = 'overflow-wrap: anywhere;'><strong>%s <br/>%s Destinations</div><br/>%s Euclidean Miles from LAX on average<br/>%s minutes between OD tweets </div><br/>%s Miles from LAX on average</div><br/>%s minutes from LAX on average</div>",
puma.spdf$NAME,
puma.spdf$Dest_pt_count,
puma.spdf$Avg_Euc_Dist_Mi,
puma.spdf$Avg_tweetTime,
puma.spdf$Avg_RtDist_Mi,
puma.spdf$Avg_RtTime_min) %>% lapply(htmltools::HTML)
leaflet() %>% addTiles() %>% etc...
FULL CODE HERE
## Map with OD data and travel stats ##
labels.dest2 <- HTML(sprintf("<div style = 'overflow-wrap: anywhere;'> <strong>%s <br/>%g Destinations</div><br/>%s Euclidean Miles from LAX on average<br/>%s minutes between OD tweets </div><br/>%s Miles from LAX on average</div><br/>%s minutes from LAX on average</div>",
puma.spdf$NAME,
puma.spdf$Dest_pt_count,
puma.spdf$Avg_Euc_Dist_Mi,
puma.spdf$Avg_tweetTime,
puma.spdf$Avg_RtDist_Mi,
puma.spdf$Avg_RtTime_min))
leaflet() %>% addTiles() %>%
setView(lng=-118.243683, lat=34.1, zoom = 9.35) %>%
addEasyButton(easyButton(
icon="fa-crosshairs", title = "Default View",
onClick=JS("function(btn, map) {var groupLayer = map.layerManager.getLayerGroup('Destinations (red)'); map.fitBounds(groupLayer.getBounds());}"))) %>%
addProviderTiles(providers$CartoDB.Positron,
group = "Grey") %>%
addProviderTiles(providers$OpenStreetMap.BlackAndWhite,
group = "OSM") %>%
# Add Polygons
# Destination data
addPolygons(data = puma.spdf,
group = "Destination Density",
fillColor = ~pal.dest(Dest_pt_count),
weight = 1,
opacity = 90,
color = "white",
dashArray = "3",
fillOpacity = 0.5,
highlight = highlightOptions(weight = 2,
color = "#666",
dashArray = "",
fillOpacity = 0.7,
bringToFront = TRUE,
sendToBack = TRUE),
label = labels.dest2,
labelOptions = labelOptions(style = list("font-weight" = "normal", padding = "3px 8px"),
textsize = "15px",
direction = "auto")) %>%
addLegend(values=puma.spdf$Dest_pt_count,
group = "Destination Density",
pal=pal.dest,
title="Destination Density (Dest per PUMA)",
position = "bottomright") %>%
# Add Points
addCircleMarkers(data = D.spdf,
radius = 2,
color = "red",
group = "Destinations (red)",
fillOpacity = 0.5) %>%
addCircleMarkers(data = O.spdf,
radius = 2,
color = "green",
group = "Origins (green)") %>%
# Add Layer Controls
addLayersControl(
baseGroups = c("OSM (default)", "Grey"),
overlayGroups = c("Destinations (red)", "Origins (green)","Destination Density"),
options = layersControlOptions(collapsed = FALSE)
)

Answer 1

The problem was that the first column puma.spdf$NAME was not part of the dataset and was throwing off the string.. check to make sure all the variables you want to show are actually part of the dataset.