将鼠标悬停在传单中的国家/地区上以查看其名称

Question

我正在创建世界地图：

library(leaflet)
library(rnaturalearth)
countries <- rnaturalearth::countries110
mymap <- leaflet(countries)
mymap %>% addPolygons(stroke = FALSE, smoothFactor = 0.2, fillOpacity = 1)

是否可以将鼠标悬停在任何国家/地区上以查看其名称或单击任何国家/地区以查看其名称？

非常感谢！

Answer 1

我找到了解决办法。首先，使用库 "htmltools" 创建标签列表然后 lapply 它在标签 = 下。所以，最终的代码是：

library(leaflet)
library(rnaturalearth)
library(htmltools)

countries <- rnaturalearth::countries110
mymap <- leaflet(countries)
labs <- as.list(countries$name)
mymap %>% addPolygons(stroke = FALSE, smoothFactor = 0.2, 
                      fillOpacity = 1, label = lapply(labs, HTML))

Answer 2

或者，更简单：

library(leaflet)
library(rnaturalearth)

countries <- rnaturalearth::countries110
mymap <- leaflet(countries)
mymap %>% addPolygons(stroke = FALSE, smoothFactor = 0.2, 
                      fillOpacity = 1, label = ~name)

只要标签数据是要绘制的数据框的一部分，~ 符号就很有魅力。

将鼠标悬停在传单中的国家/地区上以查看其名称

Mousehover over country in leaflet to see its name

r

leaflet

mousehover

rnaturalearth