单击传单标记将您带到URL

问题描述

这是 JS解决方案.

在R中，添加带有URL的弹出窗口:

In R, to add a Popup with a URL:

library(leaflet)
content <- paste(sep = "<br/>",
                 "<b><a href='http://www.samurainoodle.com'>Samurai Noodle</a></b>"
)

leaflet() %>% addTiles() %>%
  addPopups(-122.327298, 47.597131,  content,
             options = popupOptions(closeButton = FALSE)
  )

添加一个标记，也很简单，当单击该标记时，将在弹出窗口中提供一个URL:

It's also straightforward to add a Marker that, when clicked, provides a URL in the popup:

leaflet() %>% addTiles() %>%
  addMarkers(-122.327298, 47.597131, popup =  content,
            options = popupOptions(closeButton = FALSE)
  )

也许自定义项已传递给...中的传单?

Perhaps something custom passed to leaflet in ...?

最后，自定义JS函数如何为每个地图标记显示不同的URL?考虑示例data.frame:

Lastly, how could a custom JS function display different URLs for each map marker? Consider the example data.frame:

df <- data.frame(url = c("https://stackoverflow.com/questions/tagged/python",
                         "https://stackoverflow.com/questions/tagged/r")),
                 lng = c(-122.327298, -122.337298),
                 lat = c(47.597131,47.587131))

---

*这是先前询问的，但我是在问这个问题再次在这里做一个最小的，可复制的例子.

---

*This was previously asked, but I'm asking the question again here and making a minimal, reproducible example.

推荐答案

您可以使用htmltools或htmlwidgets通过javascript添加onclick事件:

You could use htmltools or htmlwidgets to add an onclick event with javascript:

解决方案1)和htmltools:

Solution 1) with htmltools:

library(leaflet)
map <- leaflet() %>%
  addTiles() %>%
  addMarkers(-122.327298, 47.597131, popup =  'LINK',
             options = popupOptions(closeButton = FALSE)
  )

library(htmltools)
browsable(
  tagList(
    list(
      tags$head(
        tags$script(
          '
         document.addEventListener("DOMContentLoaded", function(){
           var marker = document.getElementsByClassName("leaflet-pane leaflet-marker-pane");
           var openLink = function() {
             window.open("https://www.stackoverflow.com")
           };
           marker[0].addEventListener("click", openLink, false);
         })
          '
        )
      ),
      map
    )
  )
)

解决方案2-带有htmlwidgets:

library(leaflet)
library(htmlwidgets)
leaflet() %>%
  addTiles() %>%
  addMarkers(-122.327298, 47.597131, popup =  'LINK',
             options = popupOptions(closeButton = FALSE)
  ) %>%
  onRender('
    function(el, x) {
      var marker = document.getElementsByClassName("leaflet-pane leaflet-marker-pane");
      var openLink = function() {
        window.open("https://www.stackoverflow.com")
      };
      marker[0].addEventListener("click", openLink, false);
    }
  ')

每个标记的网址不同:

这是一种肮脏的方法，它显示了一般的方法.我没有时间去适应JS中的闭包以添加循环.

This is a dirty approach and shows the general way. I lack time to get comfortable with closures in JS again to add a loop.

可以在这里查看: addEventListener使用for循环和传递值.并且可以使用onRender函数将数据从R传递到JS.也许我会在周末再次找时间，或者您/某人添加了这一部分.随时公开问题，..

One could look here: addEventListener using for loop and passing values. And data can be passed from R to JS with the onRender function. Maybe i find time on the weekend again or you/someone adds this part. Feel free to leave the question open,..

 jsCode <- paste0('
 function(el, x) {
  var marker = document.getElementsByClassName("leaflet-marker-icon leaflet-zoom-animated leaflet-interactive");
  marker[0].onclick=function(){window.open("https://stackoverflow.com/questions/tagged/python");};
  marker[1].onclick=function(){window.open("https://stackoverflow.com/questions/tagged/r");};
}
 ')


 library(leaflet)
 library(htmlwidgets)
 leaflet() %>%
   addTiles() %>%
   addMarkers(lng = df$lng, lat = df$lat, popup =  'LINK',
              options = popupOptions(closeButton = FALSE)
   ) %>%
   onRender(jsCode)

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