更好地控制R中的传单弹出窗口 [英] Getting finer control of leaflet popups in r

问题描述

我正在尝试使用leaflet包更好地控制R中的leaflet弹出窗口. MWE的代码如下:

I am trying to get finer control of leaflet popups in R, using the leaflet package. The code for a MWE is below:

library(dplyr)
library(magrittr)
library(leaflet)

download.file(
  url = "http://biogeo.ucdavis.edu/data/gadm2.8/rds/GBR_adm1.rds", 
  destfile = "GBR_adm1.rds", 
  method = "curl"
)

shp_gbr <- readRDS("GBR_adm1.rds")

# get centroids for placing popups in second map
shp_gbr_centers <- 
  rgeos::gCentroid(shp_gbr, byid = TRUE) %>% 
  sp::SpatialPointsDataFrame(shp_gbr@data, match.ID = FALSE)

shp_gbr@data %<>% 
  left_join(shp_gbr_centers[1], by = 'OBJECTID', copy = TRUE) %>% 
  rename(lat = y, lng = x) %>% 
  select(NAME_1, lat, lng) %>% 
  mutate(text = ProgGUIinR::LoremIpsum)

popup <- paste("<b><h3>", shp_gbr$NAME_1, "</h3></b>", shp_gbr$text)

shp_gbr %>% 
  leaflet() %>% 
  addPolygons(popup = ~popup)

这提供了一个不错的地图，其中包含在4个国家/地区内单击时会出现的弹出窗口，但是在这种情况下，文本太多了，无法很好地处理弹出窗口:

This gives a nice map with popups that appear on clicking within the areas of the 4 countries, but in this case, the text is too much for the popup to handle nicely:

我想通过addPopups函数访问一些可用的popupOptions，在这种情况下，使弹出窗口更宽并具有滚动条.下面是一个示例:

What I would like is to access some of the popupOptions available via the addPopups function, in this case to make the popup wider and have a scroll bar. An example of this is below:

shp_gbr %>% 
  leaflet() %>% 
  addPolygons() %>%
  addPopups(
    data = shp_gbr@data,
    popup = ~popup,
    options =
      popupOptions(
        maxWidth = 600,
        maxHeight = 100
      )
  )

但是，现在将弹出窗口设置为在启动时打开，而不是在边界内单击时显示，并且一旦关闭就不会在单击时重新打开:

However, the popups are now set to be open on launch, rather than appearing on clicking within the boundaries, and do not reopen on click once closed:

我的问题是如何组合这些元素，以便您可以在地图中(例如第一个示例)使用滚动条来显示太多文本，默认情况下，弹出式窗口处于关闭状态，但单击时会打开. >

My question is how to combine these elements so that you could have, say, a scroll bar for too much text within a map such as the first example, where the popups are closed by default but open on click.

推荐答案

您可以使用此函数创建弹出窗口:

You could use this function to create your popup:

popup <- paste("<div class='leaflet-popup-scrolled' style='max-width:600px;max-height:100px'><b><h3>", shp_gbr$NAME_1, "</h3></b>", shp_gbr$text,"</div>")

它使用leaflet-popup-scrolled类将弹出窗口包装在div中，以添加滚动条和内联CSS来设置max-width和max-height.

It wraps the popup in a div with the leaflet-popup-scrolled class to add the scroll bar and inline CSS to set the max-width and max-height.

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