使用动作按钮移至闪亮应用程序中的数据框的下一行 [英] Use actionbutton to move to the next row of dataframe in a shiny app

问题描述

我下面有一个 shiny 应用程序，其中，当用户单击数据表的一行时，子集出现在另一个数据框 df 中，并显示文本.

当我按下 Next actionbutton()文本时，想要显示子集数据帧的下一行数据.在这种情况下，它应该显示花b的得分为5" .

我的原始数据将有很多行，因此每当我需要根据对应的行来适应文本时，按 Next .

  shinyApp(ui = fluidPage(DT :: dataTableOutput('tableId')，textOutput("celltext")，actionButton(下一个"，下一个"))，服务器=函数(输入，输出){output $ tableId = DT :: renderDataTable(iris [，c(1,5)]，选择=列表(目标=行"，模式=单个"))物种< -c("setosa"，"setosa"，"virginica"，"virginica"))花< -c("a"，"b"，"c"，"d")得分< -c(7,5,6,9)df< -data.frame(种类，花，分数)watchEvent(input $ tableId_rows_selected，{输出$ celltext<-renderText({单元格<-输入$ tableId_rows_selecteddat< -df [df $ species％in％iris [cell，5]，]df< -dat [order(dat $ score，decreasing = T)，]df粘贴(花"，df [1,2]，有得分"，df [1,3])})})}) 

解决方案

定义 reactiveValues 对象会有所帮助.也许您正在寻找这个

  shinyApp(ui<-fluidPage(DT :: dataTableOutput('tableId')，textOutput("celltext")，actionButton(下一个"，下一个"))，服务器<-功能(输入，输出){rv<-reactValues(text = NULL)dt<-reactValues(数据= NULL)rnum<-reactVal(0)output $ tableId = DT :: renderDataTable(iris [，c(1,5)]，选择=列表(目标=行"，模式=单个"))物种< -c("setosa"，"setosa"，"virginica"，"virginica"，"setosa"，"setosa"，"virginica"，"virginica")花< -c("a"，"b"，"c"，"d"，"e"，"f"，"g"，"h")得分< -c(7,5,6,9,1,2,3,4)df< -data.frame(种类，花，分数)watchEvent(input $ tableId_rows_selected，{第<行-输入$ tableId_rows_selecteddat< -df [df $ species％in％iris [row，5]，]dt $ data< -dat [order(dat $ score，decreasing = T)，]rv $ text<-paste(花"，dt $ data [1,2]，有分数"，dt $ data [1,3])朗姆酒(1)输出$ celltext<-renderText({rv $文本})})watchEvent(input [['next']]，{rnum(rnum()+ 1)rv $ text<-paste(花"，dt $ data [rnum()，2]，有分数"，dt $ data [rnum()，3])})}) 

I have the shiny app below in which when the user clicks on a row of the datatable a subset happens in another dataframe df and a text is displayed.

I want when I press the Next actionbutton() the text to display the data of the next row of the subseted dataframe. In this case it should display "flower b has score 5".

My original data will have many rows so when pressing Next everytime I need to adapt the text based on the correspondent row.

shinyApp(
  ui = fluidPage(DT::dataTableOutput('tableId'),
                 textOutput("celltext"),
                 actionButton("next","Next")),
  server = function(input, output) {
    output$tableId = DT::renderDataTable(
      iris[,c(1,5)],  selection = list(target = 'row',mode="single")
    )
    species<-c("setosa","setosa","virginica","virginica")
    flower<-c("a","b","c","d")
    score<-c(7,5,6,9)
    df<-data.frame(species,flower,score)
    
    observeEvent(input$tableId_rows_selected, {
    output$celltext <- renderText({
      cell <- input$tableId_rows_selected
      dat<-df[df$species %in% iris[cell,5],]
      df <-dat[order(dat$score,decreasing = T),]
      df
      paste("flower",df[1,2],"has score",df[1,3])
    })
    })
  }
)

解决方案

Defining reactiveValues object will help. Perhaps you are looking for this

shinyApp(
  ui <- fluidPage(DT::dataTableOutput('tableId'),
                 textOutput("celltext"),
                 actionButton("next","Next")),

  server <- function(input, output) {
    rv <- reactiveValues(text=NULL)
    dt <- reactiveValues(data=NULL)
    rnum <- reactiveVal(0)
    output$tableId = DT::renderDataTable(
      iris[,c(1,5)],  selection = list(target = 'row',mode="single")
    )
    species<-c("setosa","setosa","virginica","virginica","setosa","setosa","virginica","virginica")
    flower<-c("a","b","c","d","e","f","g","h")
    score<-c(7,5,6,9,1,2,3,4)
    df<-data.frame(species,flower,score)

    observeEvent(input$tableId_rows_selected, {
      row <- input$tableId_rows_selected
      dat<-df[df$species %in% iris[row,5],]
      dt$data <-dat[order(dat$score,decreasing = T),]
      rv$text <- paste("flower",dt$data[1,2],"has score",dt$data[1,3])
      rnum(1)
      output$celltext <- renderText({
        rv$text
      })

    })

    observeEvent(input[['next']], {
      rnum(rnum()+1)
      rv$text <- paste("flower",dt$data[rnum(),2],"has score",dt$data[rnum(),3])
    })
  }
)

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