R Leaflet:将多个组分配给一个层以过滤数据并更改

问题描述

我试图在 R 传单中找到一种方法来包含覆盖按钮，以过滤掉数据中的组.我还需要包含用于切换数据中表示的列的单选按钮.我似乎找不到使用 addLayersControl() 函数在 R 传单中执行此操作的方法.

I am trying to find a way in R leaflet to include overlay buttons which filters out groups in the data. I also need to include radio buttons which switch the column which is being represented in the data. I can't seem to find a way to do this in R leaflet using the addLayersControl() function.

我最初认为可以将多个组添加到单个图层并使用 baseGroups 和 overlayGroups(如下面的代码所示).然而，这并没有达到预期的结果.如果有人可以提出另一种方法来实现这一目标，我将不胜感激.最好不要发亮.

I initial thought it would be possible to add multiple groups to a single layer and use baseGroups and overlayGroups (as seen in the code below). However, this does not achieve the desired results. I would appreciate it if someone could suggest an alternative way to achieve this. Preferably without shiny.

library(dplyr)
library(leaflet)

data <- data.frame(Name = c("A", "A", "A", "B", "B", "C", "C", "C"),
                   Value1 = c(12,43,54,34,23,77,44,22),
                   Value2 = c(6,5,2,7,5,6,4,3),
                   Lat = c(51.1, 51.6, 57.3, 52.4, 56.3, 54.3, 60.4, 49.2),
                   Lon = c(5, -3, -2, -1, 4, 3, -5, 0))
data %>%
  leaflet() %>%
  addProviderTiles(providers$CartoDB.Positron) %>%
  addCircles(lat=~Lat, lng=~Lon, radius = ~Value1*1000, group=c(~Name, "Value1")) %>%
  addCircles(lat=~Lat, lng=~Lon, radius = ~Value2, group=c(~Name, "Value2")) %>%
  addLayersControl(
    baseGroups = c("Value1", "Value2"),
    overlayGroups = c("A", "B", "C"),
    options = layersControlOptions(collapsed = F)
  )

图像:输出不是我所期望的

推荐答案

下面是一个非常不优雅和 hacky 的问题解决方案.它为每个圆圈分配一个图层 ID，并使用一些 javascript 来确定在给定输入复选框的情况下应该显示哪个圆圈.

Below is a very inelegant and hacky solution to the problem. It assigns a layer id to each circle and uses some javascript to determine which circle should be displayed given the input checkboxes.

可以在此处找到工作演示:https://rpubs.com/Jumble/leaflet_layer_control

A working demonstration can be found here: https://rpubs.com/Jumble/leaflet_layer_control

如果有人有更优雅的解决方案，请分享.

Please share if anyone has a more elegant solution.

library(dplyr)
library(leaflet)
library(htmlwidgets)

data <- data.frame(ID = c("1", "2","3","4","5","6","7","8"),
                   Name = c("A", "A", "A", "B", "B", "C", "C", "C"),
                   Value1 = c(12,43,54,34,23,77,44,22),
                   Value2 = c(6,5,2,7,5,6,4,3),
                   Lat = c(51.1, 51.6, 57.3, 52.4, 56.3, 54.3, 60.4, 49.2),
                   Lon = c(5, -3, -2, -1, 4, 3, -5, 0))
data %>%
  leaflet() %>%
  addProviderTiles(providers$CartoDB.Positron) %>%
  addCircles(lat=~Lat, lng=~Lon, radius = ~Value1*1000, group=~Name, label=~Name, popup=~as.character(Value1), layerId = ~paste(ID,"Value1", sep="")) %>%
  addCircles(lat=~Lat, lng=~Lon, radius = ~Value2, group=~Name, label=~Name, popup=~as.character(Value2), layerId = ~paste(ID,"Value2", sep="")) %>%
  addLayersControl(
    baseGroups = c("Value1", "Value2"),
    overlayGroups = c("A", "B", "C"),
    options = layersControlOptions(collapsed = F)
  ) %>%
  htmlwidgets::onRender("
    function(el, x) {
      var myMap = this;
      var baseLayer = 'Value1';
      myMap.eachLayer(function(layer){
        var id = layer.options.layerId;
        if (id){
          if ('Value1' !== id.substring(1,)){
            layer.getElement().style.display = 'none';
          }
        }
      })
      console.log(myMap.baselayer);
      myMap.on('baselayerchange',
        function (e) {
          baseLayer=e.name;
          myMap.eachLayer(function (layer) {
              var id = layer.options.layerId;
              if (id){
                if (e.name !== id.substring(1,)){
                  layer.getElement().style.display = 'none';
                  layer.closePopup();
                }
                if (e.name === id.substring(1,)){
                  layer.getElement().style.display = 'block';
                }
              }

          });
        })
        myMap.on('overlayadd', function(e){
          myMap.eachLayer(function(layer){
            var id = layer.options.layerId;
            if (id){
                if (baseLayer !== id.substring(1,)){
                  layer.getElement().style.display = 'none';
                }
            }    
          })
        })
    }")

这篇关于R Leaflet:将多个组分配给一个层以过滤数据并更改表示的列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持html5模板网！