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我有一个带有 UI 的 Shiny 网页,它的条件是在侧边栏面板的顶部选择“Alfa/Beta”,然后在每种情况下从字段列表中进行选择。

ui.R如果我对文件中的 selectInputs 的值列表进行硬编码,我设法达到了一个可以工作的点ui.R,但是现在我想要一个工作版本,它将 selectInputsui.R与来自获取的内容相结合来自 db 中的数据server.R

我的问题是我不知道如何将可能值列表从 db 选择传递server.R到 selectInputs in ui.R,然后将选择传递回server.R以生成绘图。我在教程中阅读的示例没有这种高级别的条件面板,这让我感到困惑。

我勾勒出我想象的如何工作,但留下了一些我不知道该怎么做的地方(见下文)。

任何想法如何来回传递这些选择?

用户界面

## Old hard-coded values
# alfaFieldA = c("One","Ttwo")
# ...

shinyUI(pageWithSidebar(
  headerPanel("Page Dev"),
  sidebarPanel(
      selectInput("option","Alfa/Beta",c("Alfa","Beta")),
      conditionalPanel(condition="input.option=='Alfa'",
                       selectInput("SOMEHOW.alfaFieldA","Alfa FieldA",choices=alfaFieldA,selected=alfaFieldA,multiple=T)
      ),
      conditionalPanel(condition="input.option=='Beta'",
                       selectInput("SOMEHOW.betaFieldA" ,"Beta FieldA" ,choices=betaFieldA,selected=betaFieldA,multiple=T)
      ),
      wellPanel(
      p(strong("Selection from lists from either Alfa or Beta:")),
      conditionalPanel(condition="input.option=='Alfa'",
                       selectInput("SOMEHOW.alfaFieldB","Alfa FieldB",choices=alfaFieldB,selected=alfaFieldB,multiple=T)
      ),
      conditionalPanel(condition="input.option=='Alfa'",
                       selectInput("SOMEHOW.alfaFieldC","Alfa FieldC",choices=alfaFieldC,selected=alfaFieldC,multiple=T)
      ),
      conditionalPanel(condition="input.option=='Beta'",
                       selectInput("SOMEHOW.betaFieldB" ,"Beta FieldB" ,choices=betaFieldB,selected=betaFieldB,multiple=T)
      ),
      conditionalPanel(condition="input.option=='Beta'",
                       selectInput("SOMEHOW.betaFieldC" ,"Beta FieldC" ,choices=betaFieldC,selected=betaFieldC,multiple=T)
      )
    )
   ),

  # display the tabset depending on choosing Alfa or Beta above.
  mainPanel(
    conditionalPanel(condition="input.option=='Alfa'",
                     tabsetPanel(tabPanel("A1"),tabPanel("A2"))),
    conditionalPanel(condition="input.option=='Beta'",
                     tabsetPanel(tabPanel("B1"),tabPanel("B2"),tabPanel("B3")))
  )
))

服务器.R

library(RMySQL)
shinyServer(function(input, output, clientData) {

  # Gather data
  dbcon = dbConnect(MySQL(),user="userRO",password="xxxxx",host="my-host-01",port=5000,dbname="mydb")
  fa      = dbSendQuery(dbcon, "select a, b, c from mytableA")
  fa_data = fetch(fa, n=-1)

  fa_data = fa_data[nchar(fa_data$a)!=0,]
  # make 'mytableA.a' list visible to conditionalPanel selectInput alfaFieldA

  fb      = dbSendQuery(dbcon, "select a, b, c from mytableB")
  fb_data = fetch(fb, n=-1)
  fb_data = fb_data[nchar(fb_data$a)!=0,]
  dbret   = dbDisconnect(dbcon)
  # make 'mytableB.a' list visible to conditionalPanel selectInput betaFieldA SOMEHOW

  output$A1 <- renderGvis({
  # manipulate fa_data for selected FieldA and FieldB values SOMEHOW and plot something
  })
  output$B1 <- renderGvis({
  # manipulate fb_data for selected FieldA, FieldB and FieldC values SOMEHOW and plot something
  })
  # ...
})
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