在 R shiny 中，如何向操作按钮 "Add" 添加功能？

Question

我正在开发 R shiny 应用程序。我已经在 Shiny 中创建了 Tab1 和 Tab2，我试图做的是在我填写以下表格并点击“添加”按钮后使数据表在“Tab2”中可见。

总结

当用户在Tab1中输入“SchoolId, UserId, class, result”的信息并点击“Add”按钮时，应该会出现“Tab2”中的Datatable。

此外，一旦用户按下“添加”按钮，“SchoolId”、“UserId”等字段应为空，以供用户填写“Tab2”中第二行的数据."

问题：

我确定我在这里遗漏了一些东西来为“添加”按钮建立服务器级连接，因为我无法填写 Tab2 中第二行的详细信息，因为“添加”按钮是不工作。

有人可以帮助解决这个问题吗？

library(shiny)
library(shinyBS)
library(stringr)
library(Hmisc)
library(rhandsontable)
library(shinydashboard)
library(DT)
library(V8)

ui <- fluidPage(
  fluidRow(tabsetPanel(id='tabs'
                           , tabPanel("Tab1", uiOutput("tabP1"))
                           , tabPanel("Tab2", uiOutput("tabP2"))
    )
   
  )
)

server <- function(input, output, session) {
 output$tabP1 <- renderUI({
    tabPanel("Tap1"
             , div(id = "form"
                   , textInput("schoolId *", label="SchoolId" )
                   , selectInput("userId", label="UserId"
                                 , choices = list("UserA" = "UserA", "UserB" = "UserB",
                                                  
                                                  "UserC" = "UserC")
                                                  
                                                  , selected = "UserA")
                   
                   
                   , textInput("class", value = NA, label = "class")
                   
                   , selectInput("result", label="result"
                                 , choices = list("PASS" = "PASS", "FAIL" ="FAIL" ), selected = "")
                  
             )
             
             , actionButton("add", "Add")
    )
  })
  
 
  # -------------------- Tab2  ----------------------------------
  
  observeEvent(input$add,{
    req(input$schoolId,input$userId,input$class,input$result)
    tmp<-data.frame(SCHOOLID=input$schoolId, USERID=input$userId
                    , CLASS= input$class
                    , RESULT=input$result
                    
    )
    
    df <- rbind(df,tmp)
  })
  output$DT2 <- DT::renderDataTable({
    df
  })
  
  output$tabP2 <- renderUI({
    tabPanel("View"
             , DT::dataTableOutput("DT2")
             , hr()
             , hidden(downloadButton('downloadData', 'Download'))
             
    )
  })
  
}

shinyApp(ui, server)

Answer 1

您想对可以反复更改的值使用 reactive 或 reactiveValues 之类的东西。要在单击按钮之前隐藏 table，请根据按钮的输出使用 conditionalPanel（它会显示单击了多少次）。

我已经在你下面的代码中实现了这些东西：

编辑：同时回复您的第一条评论

library(shiny)
library(stringr)
library(shinydashboard)
library(tidyverse)
library(DT)

ui <- fluidPage(
  fluidRow(tabsetPanel(id='tabs', 
                       tabPanel("Tab1",
                                div(id = "form", 
                                    textInput("schoolId", label="SchoolId *" ),
                                    selectInput("userId", label="UserId", choices = c("UserA", "UserB", "UserC"),selected = "UserA"), 
                                    textInput("class", label = "class"), 
                                    selectInput("result", label="result", choices = c("PASS", "FAIL" ))
                                    ),
                                actionButton("add", "Add")
                                ), 
                       tabPanel("Tab2", 
                                tabPanel("View", 
                                         conditionalPanel("input.add != 0", 
                                                          DTOutput("DT2"), hr(), downloadButton('downloadData', 'Download'))
                                         )
                                )
                       )
           )
)

server <- function(input, output, session) {
  store <- reactiveValues()
  
  observeEvent(input$add,{
    new_entry <- data.frame(SCHOOLID=input$schoolId, USERID=input$userId
                            , CLASS= input$class
                            , RESULT=input$result)
    
    if("value" %in% names(store)){
      store$value<-bind_rows(store$value, new_entry)
    } else {
      store$value<-new_entry
    }
    # If you want to reset the field values after each entry use the following two lines
    for(textInputId in c("schoolId", "class")) updateTextInput(session, textInputId, value = "")
    updateSelectInput(session, "userId", selected = "UserA")
    updateSelectInput(session, "result", selected = "PASS")
  })
  output$DT2 <- renderDT({
    store$value
  })
  
}

shinyApp(ui, server)

在 R shiny 中，如何向操作按钮 "Add" 添加功能？

In R shiny, how do I add functionality to the action button "Add"?

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