[英]Click on points in a leaflet map as input for a plot in shiny
使用下面的示例,我试图找到一种向我的闪亮应用程序添加功能的方法,从而可以实现以下目的:
基本上,我希望可以在地图上单击某个站点,或者可以使用键盘手动输入该站点。
传单可以吗? 我已经看到了使用plotly的参考,这可能是最终的解决方案,但是我希望在可能的情况下尽可能多地散发传单,因为我已经对传单做了很多工作。 尽管这里有可用的示例,但这类似于此问题 :
library(shiny)
library(leaflet)
library(shinydashboard)
library(ggplot2)
library(dplyr)
data("quakes")
shinyApp(
ui = dashboardPage(title = "Station Lookup",
dashboardHeader(title = "Test"),
dashboardSidebar(
sidebarMenu(
menuItem("Data Dashboard", tabName = "datavis", icon = icon("dashboard")),
menuItem("Select by station number", icon = icon("bar-chart-o"),
selectizeInput("stations", "Click on Station", choices = levels(factor(quakes$stations)), selected = 10, multiple = TRUE)
)
)
),
dashboardBody(
tabItems(
tabItem(tabName = "datavis",
h4("Map and Plot"),
fluidRow(box(width= 4, leafletOutput("map")),
box(width = 8, plotOutput("plot")))
)
)
)
),
server = function(input, output) {
## Sub data
quakes_sub <- reactive({
quakes[quakes$stations %in% input$stations,]
})
output$plot <- renderPlot({
ggplot(quakes_sub(), aes(x = depth, y = mag))+
geom_point()
})
output$map <- renderLeaflet({
leaflet(quakes) %>%
addTiles() %>%
addCircleMarkers(lng = ~long, lat = ~lat, layerId = ~stations, color = "blue", radius = 3) %>%
addCircles(lng = ~long, lat = ~lat, weight = 1,
radius = 1, label = ~stations,
popup = ~paste(stations, "<br>",
depth, "<br>",
mag)
)
})
}
)
您可以使用input$map_marker_click
和updateSelectInput()
:
编辑:添加了功能,可以按照OP在注释中从selectInput()
删除站的功能。
(不要忘记添加session
到你的服务器功能)。
observeEvent(input$stations,{
updateSelectInput(session, "stations", "Click on Station",
choices = levels(factor(quakes$stations)),
selected = c(input$stations))
})
observeEvent(input$map_marker_click, {
click <- input$map_marker_click
station <- quakes[which(quakes$lat == click$lat & quakes$long == click$lng), ]$stations
updateSelectInput(session, "stations", "Click on Station",
choices = levels(factor(quakes$stations)),
selected = c(input$stations, station))
})
但是,此功能会被popup event(?)部分覆盖。 如我所见,有一个内部蓝色圆圈(深蓝色),如果单击它会产生弹出窗口。 但是,仅在单击外部(浅蓝色)圆圈时, input$map_marker_click
才有效。 我将其报告为错误,...
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