Can't loop with R's leaflet package to produce multiple maps

Question

New here and relatively new to R also, so please forgive apriori and let me know what I\'m doing wrong in this post to avoid annoying others in the future:

I am tryi

Answer 1

An updated version of @timelyportfolio's post from last year. I needed to add a timelineControl function to get it to work. I also needed to call the getMap() function of the leaflet element to get the functions to bind to the map object.

library(htmlwidgets)
library(htmltools)
library(leaflet)
library(geojsonio)

#Build data.frame with 10 obs + 3 cols
power <- data.frame(
    "Latitude" = c(33.515556, 38.060556, 47.903056, 49.71, 49.041667, 31.934167, 54.140586, 54.140586, 48.494444, 48.494444),
    "Longitude" = c(129.837222, -77.789444, 7.563056, 8.415278, 9.175, -82.343889, 13.664422, 13.664422, 17.681944, 17.681944),
    "start" = do.call(
        "as.Date",
        list(
            x = c("15-Sep-1971", "1-Dec-1971", "1-Feb-1972", "1-Feb-1972", "1-Feb-1972", "1-Feb-1972", "1-Apr-1972", "1-Apr-1972", "24-Apr-1972", "24-Apr-1972"),
            format = "%d-%b-%Y"
        )
    )
)

# set start same as end
#  adjust however you would like
power$end <- power$start + 30


# use geojsonio to convert our data.frame
#  to GeoJSON which timeline expects
power_geo <- geojson_json(power,lat="Latitude",lon="Longitude", pretty = T)

# create a leaflet map on which we will build
leaf <- leaflet() %>%
    addTiles()

# add leaflet-timeline as a dependency
#  to get the js and css
leaf$dependencies[[length(leaf$dependencies)+1]] <- htmlDependency(
    name = "leaflet-timeline",
    version = "1.0.0",
    src = c("href" = "http://skeate.github.io/Leaflet.timeline/"),
    script = "javascripts/leaflet.timeline.js",
    stylesheet = "stylesheets/leaflet.timeline.css"
)

# use the new onRender in htmlwidgets to run
#  this code once our leaflet map is rendered
#  I did not spend time perfecting the leaflet-timeline
#  options
leaf %>%
    setView(44.0665,23.74667,2) %>%
    onRender(sprintf(
        '
        function(el,x){
        var power_data = %s;

        var timelineControl = L.timelineSliderControl({
          formatOutput: function(date) {
            return new Date(date).toString();
          }
        });

        var timeline = L.timeline(power_data, {
        pointToLayer: function(data, latlng){
        var hue_min = 120;
        var hue_max = 0;
        var hue = hue_min;
        return L.circleMarker(latlng, {
        radius: 10,
        color: "hsl("+hue+", 100%%, 50%%)",
        fillColor: "hsl("+hue+", 100%%, 50%%)"
        });
        },
        steps: 1000,
        duration: 10000,
        showTicks: true
        });
        timelineControl.addTo(HTMLWidgets.find(".leaflet").getMap());
        timelineControl.addTimelines(timeline);
        timeline.addTo(HTMLWidgets.find(".leaflet").getMap());
        }
        ',
        power_geo
    ))

Answer 2

Here is a quick way to add leaflet-timeline in the way you suggest. For some reason, the timeline does not render perfectly in RStudio Viewer, but it does seem to work correctly in Chrome. I commented inline in the code to describe the steps.

library(htmlwidgets)
library(htmltools)
library(leaflet)
library(geojsonio)

#Build data.frame with 10 obs + 3 cols
power <- data.frame(
  "Latitude" = c(33.515556, 38.060556, 47.903056, 49.71, 49.041667, 31.934167, 54.140586, 54.140586, 48.494444, 48.494444),
  "Longitude" = c(129.837222, -77.789444, 7.563056, 8.415278, 9.175, -82.343889, 13.664422, 13.664422, 17.681944, 17.681944),
  "start" = do.call(
    "as.Date",
    list(
      x = c("15-Sep-1971", "1-Dec-1971", "1-Feb-1972", "1-Feb-1972", "1-Feb-1972", "1-Feb-1972", "1-Apr-1972", "1-Apr-1972", "24-Apr-1972", "24-Apr-1972"),
      format = "%d-%b-%Y"
    )
  )
)

# set start same as end
#  adjust however you would like
power$end <- power$start


# use geojsonio to convert our data.frame
#  to GeoJSON which timeline expects
power_geo <- geojson_json(power,lat="Latitude",lon="Longitude")

# create a leaflet map on which we will build
leaf <- leaflet() %>%
  addTiles()

# add leaflet-timeline as a dependency
#  to get the js and css
leaf$dependencies[[length(leaf$dependencies)+1]] <- htmlDependency(
  name = "leaflet-timeline",
  version = "1.0.0",
  src = c("href" = "http://skeate.github.io/Leaflet.timeline/"),
  script = "javascripts/leaflet.timeline.js",
  stylesheet = "stylesheets/leaflet.timeline.css"
)

# use the new onRender in htmlwidgets to run
#  this code once our leaflet map is rendered
#  I did not spend time perfecting the leaflet-timeline
#  options
leaf %>%
  setView(44.0665,23.74667,2) %>%
  onRender(sprintf(
    '
function(el,x){
    var power_data = %s;

    var timeline = L.timeline(power_data, {
      pointToLayer: function(data, latlng){
        var hue_min = 120;
        var hue_max = 0;
        var hue = hue_min;
        return L.circleMarker(latlng, {
          radius: 10,
          color: "hsl("+hue+", 100%%, 50%%)",
          fillColor: "hsl("+hue+", 100%%, 50%%)"
        });
      },
      steps: 1000,
      duration: 10000,
      showTicks: true
    });
    timeline.addTo(HTMLWidgets.find(".leaflet"));
}
    ',
    power_geo
))