google_map_update {googleway}

Google map update

Description

Update a Google map in a shiny app. Use this function whenever the map needs to respond to reactive content.

Usage

google_map_update(
  map_id,
  session = shiny::getDefaultReactiveDomain(),
  data = NULL,
  deferUntilFlush = TRUE
)

Arguments

map_id

string containing the output ID of the map in a shiny application.

session

the Shiny session object to which the map belongs; usually the default value will suffice.

data

data to be used in the map. See the details section for google_map.

deferUntilFlush

indicates whether actions performed against this instance should be carried out right away, or whether they should be held until after the next time all of the outputs are updated; defaults to TRUE.

Examples

## Not run: 

library(shiny)
library(googleway)

ui <- pageWithSidebar(
  headerPanel("Toggle markers"),
  sidebarPanel(
    actionButton(inputId = "markers", label = "toggle markers")
  ),
  mainPanel(
    google_mapOutput("map")
  )
)

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

  # api_key <- "your_api_key"

  df <- structure(list(lat = c(-37.8201904296875, -37.8197288513184,
  -37.8191299438477, -37.8187675476074, -37.8186187744141, -37.8181076049805
  ), lon = c(144.968612670898, 144.968414306641, 144.968139648438,
 144.967971801758, 144.967864990234, 144.967636108398), weight = c(31.5698964400217,
 97.1629025738221, 58.9051092562731, 76.3215389118996, 37.8982300488278,
 77.1501972114202), opacity = c(0.2, 0.2, 0.2, 0.2, 0.2, 0.2)), .Names = c("lat",
 "lon", "weight", "opacity"), row.names = 379:384, class = "data.frame")


  output$map <- renderGoogle_map({
    google_map(key = api_key)
  })

  observeEvent(input$markers,{

    if(input$markers %% 2 == 1){
      google_map_update(map_id = "map") %>%
        add_markers(data = df)
    }else{
      google_map_update(map_id = "map") %>%
        clear_markers()
    }
  })
 }
shinyApp(ui, server)

## End(Not run)