閃亮的應用程序不生成地圖

Question

我有一個巨大的數據集，但即使我只使用5個數據點，我的地圖不會被生成。下面顯示的代碼運行良好，但我只是沒有收到地圖。我可能錯過了一個非常小的觀點，並希望得到一些幫助。

library(shiny) 
library(leaflet) 
library(data.table) 

dd<- data.table(entitynum=c(400, 201, 602, 304,401), 
      londd=c(42.3, 42.4, 43.5, 42.6,42.2), 
      latdd=c(-71.1, -71.2, -71.3, -71.4,-71), 
      DAY_WEEK=c("Sunday", "Monday", "Tuesday", "Wednesday","Thursday")) 

#Set up ui 
ui <- shinyUI(fluidPage(title="", 

#App title 
titlePanel(h3("My tool", align="left")), 

#App layout 
sidebarLayout(position="left", 

#App sidePanel content and styles 
sidebarPanel(h5("Hello", width=2), 
checkboxGroupInput(inputId="InFlags", label=h4("DAYS"), 
choices=setNames(object=c("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"), 
nm=c("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"))), 
position="left"), 

#App mainPanel content and styles 
mainPanel(fluidRow(leafletOutput(outputId="lmap", width="100%",height = "100%"))) 

) 
) 
) 



server <- function(input, output){ 


#Build leaflet map 
lmap <- leaflet(data=dd)%>% 
#addTiles()%>% 
#setView(lng="-71.094824",lat="42.343479",zoom=10) %>% 
addProviderTiles(provider="MapQuestOpen.OSM") 
fitBounds(~min(londd), ~min(latdd), ~max(londd), ~max(latdd)) 

#Filter data 
datFilt <- reactive(dd[DAY_WEEK%in%input$InFlags]) 

#Add markers based on selected flags 
observe({ 
if(nrow(datFilt())==0) { 
    print("Nothing selected") 
    leafletProxy("lmap") %>% clearMarkerClusters() 
} 
else{ 
    print(paste0("Selected: ", unique(input$InFlags))) 
    leafletProxy("lmap", data=datFilt()) %>% 
    clearMarkerClusters() %>% 
    addCircleMarkers(lng=~londd, lat=~latdd, 
        clusterOptions=markerClusterOptions(), weight=3, 
        color="#33CC33", opacity=1, fillColor="#FF9900", 
        fillOpacity=0.8) 
} 
}) 

output$lmap <- renderLeaflet(lmap) 
} 

Answer 1

您的height參數不能是百分比。

從the shiny website

需要注意的是，對於高度，使用 「自動」 或 「100％」 一般不會達到預期效果，因爲高度是如何計算與HTML/CSS，

使用類似：

leafletOutput(outputId="lmap", width="100%", height = 500))) 

或

leafletOutput(outputId="lmap", width="100%", height = "500px"))) 

此外，您的地圖代碼需要調整。在setView緯度/經度必須是數字

lmap <- leaflet(data=dd)%>% 
setView(lng=-71.094824,lat=42.343479,zoom=10) %>% 
addProviderTiles(provider="MapQuestOpen.OSM") 

或者，如果你要使用你的fitBounds，你需要一個管道%>%

lmap <- leaflet(data=dd)%>% 
    #addTiles()%>% 
# setView(lng=-71.094824,lat=42.343479,zoom=10) %>% 
    addProviderTiles(provider="MapQuestOpen.OSM") %>% 
    fitBounds(~min(londd), ~min(latdd), ~max(londd), ~max(latdd))