从 Shiny DataTable 中的单元格获取值

Posted 2023-02-16

【中文标题】从 Shiny DataTable 中的单元格获取值

【英文标题】：Get value from cell in Shiny DataTable

【发布时间】：2018-05-30 11:45:16

【问题描述】：

我在 Shiny 中有这个 DataTable，当我单击一行时，我想从变量文本框中的第一列中获取值。

所以在这种情况下，如屏幕截图所示，当我点击这一行时，我想在现在是Error: object of type 'closure' is not subsettable 的地方得到Factuur Factuur。 我设法得到了行号：

用户界面： p(verbatimTextOutput('chauffeurdetails'))

服务器： output$chauffeurdetails = renderText ( chauffeurdetail = input$results_rows_selected )

有人想过我如何从第一列而不是仅从行号获取值吗？

整个R代码：

# install packages if needed
if (!require("DT")) install.packages("DT")
if (!require("tidyr")) install.packages("tidyr")
if (!require("dplyr")) install.packages("dplyr")
if (!require("readxl")) install.packages("readxl")
if (!require("shiny")) install.packages("shiny")
if (!require("expss")) install.packages("expss")

# activate packages
library("tidyr")
library("dplyr")
library("readxl")
library("DT")
library("shiny")
library("expss")

# Lees MI bestand
MIinport <- read_excel("~/Documents/MI.xlsx", col_types = c("skip", "skip", "text", "skip", "text", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "text", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "text","skip",  "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "text","skip",  "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip", "skip"))
# Hernoem kolommen
MIinport <- unite(MIinport, KlantRef, Klant, Referentie, sep=" | ", remove = TRUE)
colnames(MIinport)<- c("Chauffeur", "Kenteken", "Klant", "ARDNK")
# Filter locatiewerk
MIinport <- subset(MIinport, is.na(MIinport$Kenteken))
MIinport$Kenteken <- NULL

DNK <- subset(MIinport, ARDNK == "DNK")
DNK$ARDNK <- NULL
AR <- subset(MIinport, ARDNK == "AR")
AR$ARDNK <- NULL

DNKfreq1 <- ftable(DNK$Chauffeur, DNK$Klant, dnn = c("Chauffeur", "Klant"))
DNKfreq2 <- as.data.frame(DNKfreq1)
DNKdata <- subset(DNKfreq2, Freq>0)
colnames(DNKdata)<- c("Chauffeur", "Klant", "Aantal")
list.DNKklanten <- as.list(unique(sort(DNKdata$Klant)))

ARfreq1 <- ftable(AR$Chauffeur, AR$Klant, dnn = c("Chauffeur", "Klant"))
ARfreq2 <- as.data.frame(ARfreq1)
ARdata <- subset(ARfreq2, Freq>0)
colnames(ARdata)<- c("Chauffeur", "Klant", "Aantal")
list.ARklanten <- as.list(unique(sort(ARdata$Klant)))

# Onderscheid studenten - FALSE = Student | TRUE = Senior
ARdata$Student <- as.numeric(grepl('[.]', ARdata$Chauffeur))
ARstudent <- subset(ARdata, Student == 0)
ARstudent$Student <- NULL
ARdata$Student <- NULL


# App
library(shiny)

ui <- basicPage(
  p (""),
  sidebarLayout(
    sidebarPanel(
      div(
      h3("Zoek instellingen"),
      uiOutput("chooselist"),
      checkboxInput("StudentOption", label = "Alleen studenten", value = FALSE),
      radioButtons("ARofDNK", label = "AR of DNK", choices = c("AR", "DNK"), selected = "AR", inline = TRUE)
    ),
    div(tags$hr(),
        h3("Chauffeur details"),
        p(textOutput('chauffeurdetails')))),

    mainPanel(
      DT::dataTableOutput("results")
    )
  )
)
server <- function(input, output, session) 
# update datatable
output$chooselist <- renderUI( 
  if (input$ARofDNK == "AR")
    tagList(
    selectInput("select", "Selecteer een klant", choices = c(" ", list.ARklanten))
    )
   else 
    tagList(
    selectInput("select", "Selecteer een klant", choices = c(" ", list.DNKklanten))
    )
  
  )
  output$value <- renderPrint( input$ARofDNK )

  SelectedKlant <- reactive(
    if (input$StudentOption == TRUE & input$ARofDNK == "AR") 
      a <- subset(ARstudent, (ARstudent$Klant == input$select))
      return(a)
     
    else if (input$StudentOption == FALSE & input$ARofDNK == "AR") 
      a <- subset(ARdata, (ARdata$Klant == input$select))
      return(a)
     else if (input$ARofDNK == "DNK")
      a <- subset(DNKdata, (DNKdata$Klant == input$select))
      return(a)
    
)

  output$results <- DT::renderDataTable(SelectedKlant(), options = list(pageLength = 20, dom = 'tip', order = list(2,'desc')), rownames = FALSE, width = 500, elementId = "results", colnames=c('Naam', 'Locatie', 'Aantal'), selection = 'single')

#  output$chauffeurdetails = renderText (
#    SelectedKlant()[input$results_rows_selected,1]
#  )

  output$chauffeurdetails = renderText (
    req(length(input$results_rows_selected)>0)
    SelectedKlant()[input$results_rows_selected,1]
  )  

# output$chauffeurdetails = renderText (
#     chauffeurdetail = input$results_rows_selected
# )

  session$onSessionEnded(function() 
    stopApp()
  )
  session$on

  

# Run the application 
shinyApp(ui = ui, server = server, options = list(launch.browser=TRUE))

编辑： 示例数据：https://www.dropbox.com/s/zjxusxcan0ps1s3/Input%20Test.xlsx?dl=0 这些数据包含隐私敏感信息，所以我创建了一个小的替代品。

【问题讨论】：

你能贴出给出错误的代码吗？

@SBista 上面的代码正在运行并显示行号。

@SBista 我添加了整个闪亮的代码

假设 ARstudent 是您的数据集，您可以尝试 ARstudent[input$results_rows_selected,1]

@SBista，当我将此服务器部分更改为 output$chauffeurdetails = renderText ( SelectedKlant[input$results_rows_selected,1] ) 我在屏幕截图中收到该错误（SelectedKlant = 我的数据表的数据框）

【参考方案1】：

output$chauffeurdetails = renderText ( SelectedKlant()[input$results_rows_selected,1] )

应该解决它。

您的最后一个问题是经典的 stringAsFactor 并且第一列是一个因素，因此我们需要将其转换为带有 as.character() 的字符

这是服务器代码的工作版本

server <- function(input, output, session) 
  # update datatable
  output$chooselist <- renderUI( 
    if (input$ARofDNK == "AR")
      tagList(
        selectInput("select", "Selecteer een klant", choices = c(" ", list.ARklanten))
      )
     else 
      tagList(
        selectInput("select", "Selecteer een klant", choices = c(" ", list.DNKklanten))
      )
    
  )
  output$value <- renderPrint( input$ARofDNK )

  SelectedKlant <- reactive(
    if (input$StudentOption == TRUE & input$ARofDNK == "AR") 
      a <- subset(ARstudent, (ARstudent$Klant == input$select))
      return(a)
     
    else if (input$StudentOption == FALSE & input$ARofDNK == "AR") 
      a <- subset(ARdata, (ARdata$Klant == input$select))
      return(a)
     else if (input$ARofDNK == "DNK")
      a <- subset(DNKdata, (DNKdata$Klant == input$select))
      return(a)
    
  )

  output$results <- DT::renderDataTable(SelectedKlant(), options = list(pageLength = 20, dom = 'tip', order = list(2,'desc')), rownames = TRUE, width = 500, elementId = "results", colnames=c('Naam', 'Locatie', 'Aantal'), selection = 'single')

  #  output$chauffeurdetails = renderText (
  #    SelectedKlant()[input$results_rows_selected,1]
  #  )

  output$chauffeurdetails = renderText (
    req(length(input$results_rows_selected)>0)
    as.character(SelectedKlant()[input$results_rows_selected,1])
  )  

  # output$chauffeurdetails = renderText (
  #     chauffeurdetail = input$results_rows_selected
  # )

  session$onSessionEnded(function() 
    stopApp()
  )
  session$on

希望这会有所帮助！

【讨论】：

现在，我得到了一个随机数。除了你的调整，我把 UI 里的verbatimTextOutput 改成了TextOutput，否则根本就不行。有什么想法吗？

嗨@George 我添加了一个工作示例。如果这对您不起作用，我们需要更多信息，最好是您正在使用的一些示例数据。我的小样本应该足够了。

@Berlin Baron，我试过了，但不幸的是，我仍然收到一个数字作为反应。应要求，我在起始帖子上发布了一个示例文档。我希望你能重现我所看到的。我还删除了整个代码，这有助于您理解。

@George 我已经修复它 - 这是一个经典的 strinAsFactor 问题