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Demo Shiny: Leaflet JS plugin - layer control for grouping overlays
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#' Demo - using Leaflet JS plugins in R and Shiny | |
#' directions from https://gist.github.com/jcheng5/c084a59717f18e947a17955007dc5f92 | |
#' implementing groupings to overlay layers : | |
#' https://github.com/ismyrnow/leaflet-groupedlayercontrol | |
#' todo: would be nice to addMarkers to group layers from R, not only from JS | |
library(shiny) | |
library(leaflet) | |
library(htmlwidgets) | |
runApp( list( | |
ui = fluidPage( leafletOutput("mymap") ), | |
server = function(input, output, session) { | |
# workaround for the src/href problem - dnld/save locally ONCE | |
urlf <- 'https://raw.githubusercontent.com/ismyrnow/leaflet-groupedlayercontrol/gh-pages/dist/%s' | |
download.file(sprintf(urlf,'leaflet.groupedlayercontrol.min.js'), 'C:/Temp/L.Control.groupedlayer.js', mode="wb") | |
download.file(sprintf(urlf,'leaflet.groupedlayercontrol.min.css'), 'C:/Temp/L.Control.groupedlayer.css', mode="wb") | |
ctrlGrouped <- htmltools::htmlDependency( | |
name = 'ctrlGrouped', | |
version = "1.0.0", | |
# works in R and Shiny - download js/css files, then use this: | |
src = c(file = normalizePath('C:/Temp')), | |
script = "L.Control.groupedlayer.js", | |
stylesheet = "L.Control.groupedlayer.css" | |
) | |
registerPlugin <- function(map, plugin) { | |
map$dependencies <- c(map$dependencies, list(plugin)) | |
map | |
} | |
output$mymap <- renderLeaflet({ | |
map <- leaflet() %>% | |
setView(-104.99, 39.73, zoom = 10) | |
map <- map %>% registerPlugin(ctrlGrouped) %>% | |
onRender("function(el, x) { | |
var basemaps = { | |
Grayscale: L.tileLayer('http://{s}.tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png', { | |
maxZoom: 18, | |
attribution: '© <a href=http://www.openstreetmap.org/copyright>OpenStreetMap</a>' | |
}), | |
Streets: L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { | |
maxZoom: 19, | |
attribution: '© <a href=http://www.openstreetmap.org/copyright>OpenStreetMap</a>' | |
}) | |
}; | |
basemaps.Grayscale.addTo(this); // default base layer | |
var groups = { | |
cities: new L.LayerGroup(), | |
restaurants: new L.LayerGroup(), | |
dogs: new L.LayerGroup(), | |
cats: new L.LayerGroup() | |
}; | |
L.marker([39.61, -105.02]).bindPopup('Littleton, CO.').addTo(groups.cities); | |
L.marker([39.74, -104.99]).bindPopup('Denver, CO.').addTo(groups.cities); | |
L.marker([39.73, -104.8 ]).bindPopup('Aurora, CO.').addTo(groups.cities); | |
L.marker([39.77, -105.23]).bindPopup('Golden, CO.').addTo(groups.cities); | |
L.marker([39.69, -104.85]).bindPopup('A restaurant').addTo(groups.restaurants); | |
L.marker([39.69, -105.12]).bindPopup('B restaurant').addTo(groups.restaurants); | |
L.marker([39.79, -104.95]).bindPopup('A dog').addTo(groups.dogs); | |
L.marker([39.79, -105.22]).bindPopup('B dog').addTo(groups.dogs); | |
L.marker([39.59, -104.75]).bindPopup('A cat').addTo(groups.cats); | |
L.marker([39.59, -105.02]).bindPopup('B cat').addTo(groups.cats); | |
// Overlay layers are grouped | |
var groupedOverlays = { | |
'Landmarks': { | |
'Cities': groups.cities, | |
'Restaurants': groups.restaurants | |
}, | |
'Random': { | |
'Dogs': groups.dogs, | |
'Cats': groups.cats | |
} | |
}; | |
var options = { | |
exclusiveGroups: ['Landmarks'], // use radio inputs | |
groupCheckboxes: true | |
}; | |
L.control.groupedLayers(basemaps, groupedOverlays, options).addTo(this); | |
}") | |
}) | |
} | |
)) |
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Thank you!
I was thinking to groupedOverlays - Way beyond my skills.