闪亮的应用程序不生成地图

Question

我有一个巨大的数据集，但即使我只使用5个数据点，我的地图不会被生成。下面显示的代码运行良好，但我只是没有收到地图。我可能错过了一个非常小的观点，并希望得到一些帮助。

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参数不能是百分比。

从the shiny website

需要注意的是，对于高度，使用 “自动” 或 “100％” 一般不会达到预期效果，因为高度是如何计算与HTML/CSS，

使用类似：

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

或

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

此外，您的地图代码需要调整。在setView纬度/经度必须是数字

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，你需要一个管道%>%

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))