Flexdashboards和Leaflet以及标记点击Highcharts

Question

我正在尝试创建一个flexdashboard,它使用Leaflet中的事件(map_marker_click)在同一页面上的另一个图表中显示highcharts柱形图.我从其他示例中获取并且在Flexdashboards教程或示例中找不到我想要的内容. 这非常接近我想要的,没有闪亮的输入或plot.ly集成和使用标记而不是多边形(更不用说继续).

我在R中的flexdashboard有以下代码:

title: "Flexdashboards and Leaflet"
output: 
flexdashboard::flex_dashboard:
vertical_layout: fill
runtime: shiny
---

```{r,include=FALSE}
library(flexdashboard)
library(shiny)
library(leaflet)
library(highcharter)
```

```{r,include=FALSE}
latitude<-c(35.94077, 35.83770, 35.84545, 35.81584, 35.79387, 36.05600)
longitude<-c(-78.58010, -78.78084, -78.72444, -78.62568, -78.64262,-78.67600)
amounts1<-c(27, 44, 34, 46, 25, 15)
amounts2<-c(34, 52, 35, 78, 14, 24)
ids<-c("a", "b", "c", "d", "e", "f")
df<-data.frame(ids,amounts1,amounts2,latitude,longitude)
renderLeaflet({ 
leaflet() %>%
addTiles() %>%
addMarkers(lng=c(longitude),lat=c(latitude))
}) 

observeEvent(input$map_marker_click,{
      click<-input$map_marker_click
      if(is.null(click))
        return()
}) 
```

```{r}
renderHighchart({
highchart() %>%
hc_chart(type = 'column')%>%
hc_add_series(name=amounts1, data=click())
hc_add_series(name=amounts2, data=click())
})
```

我想知道这是否可以在有或没有闪亮集成的flexdashboard中完成.

Answer 1

以下代码将完成它.简而言之,关键步骤是:

1. 初始化地图时,请务必指定列作为其列layerId.这样,Leaflet将在您指定事件时知道要返回的值.
2. 创建一个eventReactive返回该值的值layerId.然后,您可以根据需要使用它来对数据进行子集化以传递到图表.
3. 我喜欢创建一个反应数据帧,它是基于点击的主数据帧的子集layerId.您可以在不执行此操作的情况下编写应用程序,但我希望尽可能多地将我的Shiny应用程序分离到组件中.
4. 您现在可以在调用时使用此反应数据框及其值 renderHighchart

希望这可以帮助!

---
title: "Flex Dashboard"
output: 
  flexdashboard::flex_dashboard:
    orientation: columns
    vertical_layout: fill
runtime: shiny
---

```{r setup, include=FALSE}
library(flexdashboard)
library(shiny)
library(leaflet)
library(highcharter)

latitude<-c(35.94077, 35.83770, 35.84545, 35.81584, 35.79387, 36.05600)
longitude<-c(-78.58010, -78.78084, -78.72444, -78.62568, -78.64262,-78.67600)
amounts1<-c(27, 44, 34, 46, 25, 15)
amounts2<-c(34, 52, 35, 78, 14, 24)
ids<-c("a", "b", "c", "d", "e", "f")
df<-data.frame(ids,amounts1,amounts2,latitude,longitude)
```

Column {data-width=650}
-----------------------------------------------------------------------

```{r}
output$map <- renderLeaflet({

  leaflet() %>%
    addTiles() %>%
    addMarkers(data = df, lng = longitude, lat = latitude, 
               layerId = ~ids)

})

leafletOutput('map')  

```

Column {data-width=350}
-----------------------------------------------------------------------

```{r}

click_marker <- eventReactive(input$map_marker_click, {

  x <- input$map_marker_click

  return(x$id)

})

data_for_chart <- reactive({

  return(df[df$ids == click_marker(), ])

})

output$chart <- renderHighchart({

  highchart() %>%
    hc_chart(type = 'column') %>%
    hc_add_series(data = c(data_for_chart()$amounts1, 
                           data_for_chart()$amounts2))

})

highchartOutput('chart')

```