R 的传单:如何更改默认 CSS 集群类

2022-01-12 00:00:00 r shiny rstudio leaflet css

如何从 Leaflet for R 界面更改定义集群对象的默认 CSS 类?例如，如果我想从 .marker-cluster-small 类中移除不透明度，我如何在 R 中做到这一点?

How do I change the default CSS classes which define cluster objects from within the Leaflet for R interface? For example, if I wanted to remove the opacity from the .marker-cluster-small class, how could I do this from within R?

这里是创建集群类的 CSS:https://github.com/Leaflet/Leaflet.markercluster/blob/64a2d5711521e56cac8ab863fb658beda5690600/dist/leaflet.markercluster-src.js

Here is the CSS which creates the cluster classes: https://github.com/Leaflet/Leaflet.markercluster/blob/64a2d5711521e56cac8ab863fb658beda5690600/dist/leaflet.markercluster-src.js

例如，我想从集群中移除不透明度，例如

For example, I want to remove the opacity from the clusters, e.g.

.marker-cluster-small {
    background-color: rgba(181, 226, 140, 1.0);
    }
.marker-cluster-small div {
    background-color: rgba(110, 204, 57, 1.0);
    }

有没有办法在 iconCreateFunction 中做到这一点?

Is there a way to do this from within iconCreateFunction ?

library(leaflet)
leaflet(quakes) %>% addTiles() %>% addMarkers(
  clusterOptions = markerClusterOptions(iconCreateFunction=JS("function (cluster) {    
    var childCount = cluster.getChildCount(); 
    var c = ' marker-cluster-';  
    if (childCount < 100) {  
      c += 'large';  
    } else if (childCount < 1000) {  
      c += 'medium';  
    } else { 
      c += 'small';  
    }    
    return new L.DivIcon({ html: '<div><span>' + childCount + '</span></div>', className: 'marker-cluster' + c, iconSize: new L.Point(40, 40) });

  }"))
)

推荐答案

您可以尝试将内联 CSS 添加到创建图标的函数中的不同标记，例如:

You can maybe try to add inline CSS to the different markers in the function that creates the icons, for ex:

clusterOptions = markerClusterOptions(iconCreateFunction=JS("function (cluster) {    
    var childCount = cluster.getChildCount();  
    if (childCount < 100) {  
      c = 'rgba(181, 226, 140, 1.0);'
    } else if (childCount < 1000) {  
      c = 'rgba(240, 194, 12, 1);'  
    } else { 
      c = 'rgba(241, 128, 23, 1);'  
    }    
    return new L.DivIcon({ html: '<div style="background-color:'+c+'"><span>' + childCount + '</span></div>', className: 'marker-cluster', iconSize: new L.Point(40, 40) });

  }")

如果你使用 shiny，你也可以改变 iconCreateFunction 为每个标记分配不同的类，并添加 tags$style在标题中设置这些类的 CSS.这是一个例子:

If you are using shiny, you can also change the iconCreateFunction to assign a different class to each marker, and add tags$style in the header to set the CSS for these classes. Here's an example:

ui <- fluidPage(
  tags$head(tags$style(HTML("
  .marker-custom-small {
  background-color: rgba(181, 226, 140, 1);
    }
.marker-customr-small div {
    background-color: rgba(110, 204, 57, 1);
    }

.marker-custom-medium {
    background-color: rgba(241, 211, 87, 1);
    }
.marker-custom-medium div {
    background-color: rgba(240, 194, 12, 1);
    }

.marker-custom-large {
    background-color: rgba(253, 156, 115, 1);
    }
.marker-custom-large div {
    background-color: rgba(241, 128, 23, 1);
    }"))),
  leafletOutput("mymap"))

server<-function(input, output, session) {
  output$mymap <- renderLeaflet({
    leaflet(quakes) %>% addTiles() %>% addMarkers(
      clusterOptions = markerClusterOptions(iconCreateFunction=JS("function (cluster) {    
    var childCount = cluster.getChildCount(); 
    var c = ' marker-custom-';  
    if (childCount < 100) {  
      c += 'large';  
    } else if (childCount < 1000) {  
      c += 'medium';  
    } else { 
      c += 'small';  
    }    
    return new L.DivIcon({ html: '<div><span>' + childCount + '</span></div>', className: 'marker-cluster' + c, iconSize: new L.Point(40, 40) });

  }"))
    )
  })
}

shinyApp(ui,server)

无法弄清楚如何在 shiny 应用程序之外的 leaflet 中使用自定义 CSS.

Couldn't figure out how to have custom CSS in the leaflet outside of a shiny app.

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