r - 在闪亮 + 传单中,每次执行渲染时都会更新 setview。我想防止这种情况
问题描述
我使用闪亮和传单创建了一个地图应用程序。它投影地图和一些形状文件。形状文件具有面积值。我想根据面积值设置是否显示形状文件。具体来说,使用了 sliderInput 函数。
虽然使用 sliderInput 函数限制了 shape 文件的显示,但每次通过 sliderInput 更改数字时都会重置 setview。而不是每次都运行 setview,我希望你在你所在的地方运行 setview。我应该怎么办?我要你告诉我。
下面是示例代码
library(shiny)
library(leaflet)
ui <- shinyUI(fluidPage(
titlePanel("sample sample sample sample "),
#sidebarLayout settings
sidebarLayout(
sidebarPanel(
sliderInput("area_slider",label = h3("settings"),min = 0,max = 6000,value = c(0,6000)),
),
#mainpanel settings
mainPanel(
leafletOutput("mymap",height=600)
)
)
))
server <- shinyServer(function(input, output) {
#map settings
output$mymap <- renderLeaflet({
leaflet() %>%
addTiles(group="OSM")%>%
#setView
#setView(lng=139.8,lat=35.7,zoom=12)%>%
#maker settings1
addAwesomeMarkers(lng = df$lng,
lat = df$lat,
clusterOptions = markerClusterOptions(),
group="Oct")%>%
addPolygons(data = shp %>% subset(shp@data$area < input$area_slider),
color = "#2feeb5",
group="carea")%>%
#Layers Control
addLayersControl(
baseGroups = c("OSM"),
overlayGroups = c("Oct","carea"),
options = layersControlOptions(collapsed = FALSE))
})
})
shinyApp(ui, server)
解决方案
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