R Leaflet (CRAN) - how to register clicking off a marker

Question

Using the RStudio Leaflet package in a shiny app I\'ve been able to achieve all the functionality I\'ve looked for except deselecting a marker object once it has been clicke

Answer 1

You could use a reactiveValues to store the clicked marker and reset it whenever the user clicks on the map background:

server <- shinyServer(function(input, output) {
  data <- reactiveValues(clickedMarker=NULL)
  # produce the basic leaflet map with single marker
  output$map <- renderLeaflet(
    leaflet() %>%
      addProviderTiles("CartoDB.Positron") %>%
      addCircleMarkers(lat = 54.406486, lng = -2.925284)    
  )

  # observe the marker click info and print to console when it is changed.
  observeEvent(input$map_marker_click,{
               data$clickedMarker <- input$map_marker_click
               print(data$clickedMarker)}
  )
  observeEvent(input$map_click,{
               data$clickedMarker <- NULL
               print(data$clickedMarker)})
})