R Shiny clusterOptions not displayed on a tabPanel - conflict with rCharts? - r

Question

I am sort of struggling to display clusters of positions on a tabPanel map, when on another tabPanel, a heatmap is active.
The weird thing is that when I remove the second tabPanel (heatmap) in the ui.R, then the clusters are shown ok on the first tabPanel.
If I keep the heatmap tabPanel in the ui.R and remove "clusterOptions = markerClusterOptions()" in the server.R then the positions are displayed on the first tabPanel and heat map is OK.
Here is my code so you can easily reproduce the problem :
global.R
library(shiny)
library(shinydashboard)
library(leaflet)
library(dplyr)
library(plyr)
library(rCharts)
Lat <- c(48.89612,48.87366,48.88739,48.88558,48.87561)
Long <- c(2.383857,2.383921,2.387161,2.386701,2.387337)
data_test <- data.frame(Lat,Long)
data_test <- ddply(data_test, .(Lat, Long), summarise, count = length(Lat))
server.R
library(rCharts)
library(shiny)
library(shinydashboard)
library(leaflet)
library(dplyr)
library(plyr)
shinyServer(function (input, output){
output$map1 <- renderLeaflet({
leaflet() %>% setView(lng = 2.3488000, lat = 48.8534100, zoom = 12) %>%
addProviderTiles('CartoDB.Positron') %>%
addTiles() %>%
addCircleMarkers(lng = data_test$Long, lat = data_test$Lat,color=
'red',
clusterOptions = markerClusterOptions())
})
output$baseMap <- renderMap({
map2 = Leaflet$new()
map2$setView(c(48.85341,2.34880,13))
map2$addParams(height = 590, width = 880, zoom = 12)
map2$set(dcom = "baseMap")
return(map2)
})
output$heatMap <- renderUI({
j <- paste0("[",data_test[,"Lat"], ",", data_test[,"Long"],
",",data_test[,"count"], "]", collapse=",")
j <- paste0("[",j,"]")
tags$body(tags$script(HTML(sprintf("
var addressPoints = %s
if (typeof heat === typeof undefined) {
heat = L.heatLayer(addressPoints, {radius:
50,blur: 20,maxZoom: 5,max: 6.0,
gradient: {0.0: 'green',0.5: 'yellow',1.0:
'red' }}),
heat.addTo(map)}
else {heat.setLatLngs(addressPoints)}", j
))))
})
})
ui.R
library(rCharts)
library(shiny)
library(shinydashboard)
library(leaflet)
library(dplyr)
library(plyr)
header <- dashboardHeader(
title = "Test Paris", titleWidth = 450
)
body <- dashboardBody(
fluidRow(
column(width = 12,
tabBox(width = 12,
id = "CartePrincipale",
tabPanel("Map of Accidents",leafletOutput("map1", height="590px")),
tabPanel("HeatMap of Accidents",
showOutput("baseMap", "Leaflet"),
tags$style(' .leaflet {height: "590px";}'),
tags$head(tags$script(src="http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js")),
uiOutput("heatMap"))
)))
)
dashboardPage(
header,
dashboardSidebar(disable = TRUE),
body)
Is there a conflict somewhere with rCharts?
Many thanks for your assistance !

Answer 1

Well, I finally came across the answer, thanks to a few posts and replies from Ramnath to other people issues in the website.
In the ui.r, for the second tabPanel, the trick was just to replace
showOutput("baseMap", "Leaflet")
by :
htmlOutput("baseMap")
Clusters are now displayed Ok on the first tabPanel !