Question

我试图在flexdashboard文档中使用Shiny进行反应性selectInput。

我的第一个selectInput选择了海洋公园中的区域类型。

selectInput("Zone", label = "Marine Park Zoning:",
          choices = c("All", levels(EoTR$MarineParkZone)), selected = "All")

然后我使用此输入创建一个仅在步骤1中选择了区域的反应数据框。

zone.choices = reactive({
  if (input$Zone=="All"){
  select(EoTR, ReefName, MarineParkZone, MarineParkMgmtSection)
  }else{
  select(EoTR, ReefName, MarineParkZone, MarineParkMgmtSection)%>%
  filter(MarineParkZone==input$Zone)}
})

然后我尝试使用此反应数据框来定义我对下一个selectInput的选择

reactive({
selectInput("Reef", label = "Priority Reef:",
        choices = zone.choices()$ReefName, selected = "Arlington Reef (16-064)")
})

当我运行文档时，我的第二个输入显示了一堆代码而不是选择菜单，因此基于该选择器的所有进程都失败了。

下面是一些可以重现问题的代码

---
title: "Untitled"
output: 
  flexdashboard::flex_dashboard:
    orientation: columns
    vertical_layout: fill
runtime: shiny 
---
```{r}
library(flexdashboard)
library(dplyr)

EoTR = data.frame(ReefName=c("Reef1", "Reef2", "Reef3", "Reef4"), 
              MarineParkZone=c("Fished", "Fished", "Un-Fished", "Un-Fished"))

selectInput("Zone", label = "Marine Park Zoning:",
          choices = c("All", levels(EoTR$MarineParkZone)), selected = "All")

zone.choices = reactive({
  if (input$Zone=="All"){
  select(EoTR, ReefName, MarineParkZone)
  }else{
  select(EoTR, ReefName, MarineParkZone)%>%
  filter(MarineParkZone==input$Zone)}
})

reactive({
selectInput("Reef", label = "Priority Reef:",
        choices = zone.choices()$ReefName, selected = "Reef1")
})
```

我知道这可能与我如何定义我的反应性输入有些愚蠢，但我真的很感激任何帮助。

干杯，

萨姆

Answer 1

以下是您的解决方案：

---
title: "Untitled"
output: 
  flexdashboard::flex_dashboard:
    orientation: columns
    vertical_layout: fill
runtime: shiny 
---
```{r}
library(flexdashboard)
library(dplyr)

EoTR = data.frame(ReefName=c("Reef1", "Reef2", "Reef3", "Reef4"), 
              MarineParkZone=c("Fished", "Fished", "Un-Fished", "Un-Fished"))

selectInput("Zone", label = "Marine Park Zoning:",
          choices = c("All", levels(EoTR$MarineParkZone)), selected = "All")

zone.choices = reactive({
  if (input$Zone=="All"){
  EoTR
  }else{
  EoTR %>%
  filter(MarineParkZone==input$Zone)}
})


renderUI({selectInput("Reef", label = "Priority Reef:",
        choices = zone.choices()$ReefName, selected = "Reef1")})

```

问题在于您的selectInput("Reef"...)，您已将其设置为被动（其为inccorect） - ＆gt; 您应该将其设置为UI对象（{{1} }）。

使用Shiny创建反应式selectInput - flexdashboard

1 个答案: