inst/examples/shiny/search/features_app.R

In leaflet.extras: Extra Functionality for 'leaflet' Package

library(shiny)
library(leaflet)
library(leaflet.extras)

cities <- read.csv(textConnection("
City,Lat,Long,Pop
Boston,42.3601,-71.0589,645966
Hartford,41.7627,-72.6743,125017
New York City,40.7127,-74.0059,8406000
Philadelphia,39.9500,-75.1667,1553000
Pittsburgh,40.4397,-79.9764,305841
Providence,41.8236,-71.4222,177994
"))

ui <- fluidPage(
  leafletOutput("map"),
  actionButton("clearsearchmarker", "Clear Search Marker")
)

greenLeafIcon <- makeIcon(
  iconUrl = "https://leafletjs.com/examples/custom-icons/leaf-green.png",
  iconWidth = 38, iconHeight = 95,
  iconAnchorX = 22, iconAnchorY = 94,
  shadowUrl = "https://leafletjs.com/examples/custom-icons/leaf-shadow.png",
  shadowWidth = 50, shadowHeight = 64,
  shadowAnchorX = 4, shadowAnchorY = 62
)
awesomeicon <- leaflet::makeAwesomeIcon(
    icon = "ios-close", iconColor = "black",
    library = "ion", markerColor = "green")


server <- function(input, output, session) {
  output$map <- renderLeaflet({
    leaflet(cities) %>% addProviderTiles(providers$OpenStreetMap) %>%
      addCircles(lng = ~Long, lat = ~Lat, weight = 1, fillOpacity = 0.5,
                 radius = ~sqrt(Pop) * 10, popup = ~City, label = ~City,
                 group = "cities") %>%
      addSearchFeatures(
        targetGroups = "cities", options = searchFeaturesOptions(
          marker = list(
            icon = greenLeafIcon,
            # icon = awesomeicon,
            # animate = FALSE,
            circle = list(
              radius = 50,
              weight = 3,
              color = 'yellow',
              stroke = TRUE,
              fill = TRUE
            )
          )
        ))
  })

  observeEvent(input$clearsearchmarker, {
    leafletProxy("map") %>%
      clearSearchFeatures()
  })
}
shinyApp(ui, server)