I want to make a map using leaflet so that the points in the map have popup notes. Each popup will have a clickable link to redirect to an Internet page. The URLs that will be inserted in such popups are in a column of my data frame, which has thousands of rows. Some toy data:
place <- c("a", "b", "c", "d", "e", "f")
thing <- c("potato","melon","black pepper", "bigfoot","black panther", "orchidaceae")
lat <- c(-17.456, 31.4009, 24.293, -8.956, 8.697, -25.257)
long <- c(-63.658,-111.144,-106.759,-81.029,-83.2052,-52.026)
urls <- c("https://en.wikipedia.org/wiki/Potato",
"https://en.wikipedia.org/wiki/Melon",
"https://en.wikipedia.org/wiki/Black_pepper",
"https://en.wikipedia.org/wiki/Bigfoot",
"https://en.wikipedia.org/wiki/Black_panther",
"https://en.wikipedia.org/wiki/Orchidaceae")
d <- data.frame(place, thing, lat, long, urls)
And this is the code I've been trying to use to plot the map:
library(leaflet)
library(tidyverse)
content <- paste("The", thing,
"occurs near.You can find some information",
"<b><a href=d$urls>here</a></b>")
mymap <- d %>%
leaflet() %>%
addProviderTiles(providers$Esri.WorldImagery, group = "World Imagery") %>%
addProviderTiles(providers$Stamen.TonerLite, group = "Toner Lite") %>%
addLayersControl(baseGroups =
c("Toner Lite", "World Imagery")) %>%
addMarkers(label = thing,
popup = content,
icon = ~ icons(iconUrl = "marker_red.png",
iconWidth = 28, iconHeight = 24))%>%
addMiniMap(
toggleDisplay = TRUE,
tiles = providers$Stamen.TonerLite
) %>%
print()
The problem is that the word "here" in the popup is sort of clickable, but does not redirect me to any internet page. I don't know what to do in this situation where the URLs are contained in a column of my data frame. Besides, I have no experience working with HTML objects. Could anyone help me figure out a way to pass those URLs into the popup notes?
Thanks in advance!
CodePudding user response:
The problem is with href=d$urls
in the content, d$urls
is assigned as the URL and the actual URL is not referred here. It can be resolved using paste0
function.
The content should be
content <- paste("The", thing,
"occurs near.You can find some information",
paste0("<b><a href=",d$urls, ">here</a></b>"))
mymap <- d %>%
leaflet() %>%
addProviderTiles(providers$Esri.WorldImagery, group = "World Imagery") %>%
addProviderTiles(providers$Stamen.TonerLite, group = "Toner Lite") %>%
addLayersControl(baseGroups =
c("Toner Lite", "World Imagery")) %>%
addMarkers(label = thing,
popup = content,
icon = ~ icons(iconUrl = "marker_red.png",
iconWidth = 28, iconHeight = 24))%>%
addMiniMap(
toggleDisplay = TRUE,
tiles = providers$Stamen.TonerLite
) %>%
print()