Pop-up window

Question

I would like to create a brilliant app that has a popup when the mouse iterates over a shape / circle, rather than a standard click

in particular, I try to get a pop-up show when the mouse hangs over ... and disappears when the mouse moves away from it.

This page ( https://rstudio.imtqy.com/leaflet/shiny.html ) suggests that I need to have something likeobserveEvent({input$mymap_shape_mouseover},{showPopup()})

but not sure where to introduce it or how to use it, so any help would be greatly appreciated.

Below is a simple random example ...

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


    uu <-  data.table(row_num=seq(100),
                    Latitude=c(52+cumsum(runif(100,-0.001,0.001))),
                    Longitude=c(1+cumsum(runif(100,-0.001,0.001)))
    )





  ui <- fluidPage(
    leafletOutput("mymap")
  )

  server <- function(input, output, session) {
    output$mymap <- renderLeaflet({
      leaflet() %>%
        addTiles() %>%
        addCircles(lng=uu$Longitude,
                   lat=uu$Latitude,
                   radius=2)
    })

    # Show a popup at the given location
    show_popup_on_mouseover <- function(id, lat, lng) {
      selected_point <- uu[row_num == id,]
      content <- as.character(selected_point$row_num)
      leafletProxy("mymap") %>% 
        addPopups(lng, lat, content)
    }


    # When circle is hovered over...show a popup
    observe({
      leafletProxy("mymap") %>% clearPopups()
      event <- input$mymap_shape_mouseover
      print(event)
      if (is.null(event)){
        return()
      } else {
        isolate({
          show_popup_on_mouseover(event$id, event$lat, event$lng)
        })
      }
    })


  }

  shinyApp(ui, server)

Answer 1

This is a rather difficult task. And I do not think this is impossible.

: Shiny side , , .

: , Popup input$mymap_shape_mouseover. clearPopups . , layerId, , . , .

, clearPopup mouseout , . , , , , , mouseout, /. , , , , .

input$mymap_popup_mouseover, , , leaflet , . Github, .

:

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

uu <-  data.table(
  row_num=seq(100),
  Latitude=c(52+cumsum(runif(100,-0.001,0.001))),
  Longitude=c(1+cumsum(runif(100,-0.001,0.001)))
)

ui <- fluidPage(
  leafletOutput("mymap")
)

server <- function(input, output, session) {
  output$mymap <- renderLeaflet({
    leaflet() %>%
      addTiles() %>%
      addCircles(lng = uu$Longitude, lat = uu$Latitude, radius = 2, layerId = uu$row_num)
  })

  # When circle is hovered over...show a popup
  observeEvent(input$mymap_shape_mouseover$id, {
    pointId <- input$mymap_shape_mouseover$id

    lat = uu[uu$row_num == pointId, Latitude]
    lng = uu[uu$row_num == pointId, Longitude]
    leafletProxy("mymap") %>% addPopups(lat = lat, lng = lng, as.character(pointId), layerId = "hoverPopup")
  })
}

shinyApp(ui, server)

EDIT: .

- . , mouseover/mouseout. , , . .

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

uu <-  data.table(
  row_num=seq(100),
  Latitude=c(52+cumsum(runif(100,-0.001,0.001))),
  Longitude=c(1+cumsum(runif(100,-0.001,0.001)))
)

ui <- fluidPage(
  leafletOutput("mymap")
)

server <- function(input, output, session) {

  radius = 3

  output$mymap <- renderLeaflet({
    leaflet() %>%
      addTiles() %>%
      addCircles(lng = uu$Longitude, lat = uu$Latitude, radius = radius, layerId = uu$row_num)
  })

  observeEvent(input$mymap_shape_mouseout$id, {
    leafletProxy("mymap") %>% clearPopups()
  })

  # When circle is hovered over...show a popup
  observeEvent(input$mymap_shape_mouseover$id, {
    pointId <- input$mymap_shape_mouseover$id
    lat = uu[uu$row_num == pointId, Latitude]
    lng = uu[uu$row_num == pointId, Longitude]
    offset = isolate((input$mymap_bounds$north - input$mymap_bounds$south) / (23 + radius + (18 - input$mymap_zoom)^2 ))

    leafletProxy("mymap") %>% addPopups(lat = lat + offset, lng = lng, as.character(pointId))
  })
}

shinyApp(ui, server)