Question

我有DT，我添加了复选框作为第一列。他们的想法是为用户提供删除所选行并将其放在文件中的选项。按下冷键＆＃34;删除＆＃34;后，数据被发送到文件，但我不知道如何更新DT，以获取没有删除行的数据。代码：

library(shiny)
library(DT)
library(dplyr)


shinyApp(
  ui <- fluidPage(DT::dataTableOutput("ruless"),
                  fluidRow(column(4, offset = 1, actionButton("delete", "Delete", width = 200)))),

  server <- function(input, output) {

    values <- reactiveValues(data = NULL)

    values$data <- as.data.frame(
      cbind(c("a", "d", "b", "c", "e", "f"),
            c(1463, 159, 54, 52, 52, 220),
            c(0.7315, 0.0795, 0.027, 0.026, 0.026, 0.11)
      )
    )

    shinyInput = function(FUN, len, id, ...) {
      #validate(need(character(len)>0,message=paste("")))
      inputs = character(len)
      for (i in seq_len(len)) {
        inputs[i] = as.character(FUN(paste0(id, i), label = NULL, ...))
      }
      inputs
    }

    output$ruless <- DT::renderDataTable({
      datatable(
        data.frame(delete=shinyInput(checkboxInput,nrow(values$data),"cbox_"), values$data),
        selection="multiple",
        escape = FALSE,
        filter = list(position = 'top', clear = FALSE),
        extensions = list("ColReorder" = NULL, "Buttons" = NULL),
        options = list(
          dom = 'BRrltpi',
          autoWidth=TRUE,
          lengthMenu = list(c(10, 50, -1), c('10', '50', 'All')),
          ColReorder = TRUE,
          preDrawCallback = JS('function() { Shiny.unbindAll(this.api().table().node()); }'),
          drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } '),
          buttons = list(
            'copy',
            'print',
            list(
              extend = 'collection',
              buttons = c('csv', 'excel', 'pdf'),
              text = 'Download',
              selected = TRUE
            )
          )
        )
      )
    })


    shinyValue = function(id, len) { 
      unlist(lapply(seq_len(len), function(i) {
        value = input[[paste0(id, i)]] 
        if (is.null(value)) NA else value 
      })) 
    } 


    observeEvent(input$delete, {
      checkbox_rules <- data.frame(selected=shinyValue("cbox_",nrow(values$data)))
      marked_rules <- as.data.frame(values$data[(which(checkbox_rules == TRUE)),])
      if (file.exists("delete_file.csv")){
        delete_file <- as.data.frame(read_csv2("delete_file.csv", col_names  = TRUE))
        delete_file <- as.data.frame(rbind(delete_file, marked_rules))
        delete_file <- delete_file[!duplicated(delete_file), ]
        write.csv2(delete_file, file = "delete_file.csv", sep=";", row.names = FALSE)
      }
      else{
        write.csv2(marked_rules, file = "delete_file.csv", sep=";", row.names = FALSE)
      }
    })

  }
)

我还想替换删除按钮并重命名DT上方的其余按钮。我在想这样的事情：

我有可能做到吗？预先感谢！可能吗？

Answer 1

您可以像这样更新观察者中的data.frame

      values$data <- values$data[!checkbox_rules,]

最后看起来应该是这样的

observeEvent(input$delete, {
      checkbox_rules <- data.frame(selected=shinyValue("cbox_",nrow(values$data)))
      marked_rules <- as.data.frame(values$data[(which(checkbox_rules == TRUE)),])
      values$data <- values$data[!checkbox_rules,]
      if (file.exists("delete_file.csv")){
        delete_file <- as.data.frame(read_csv2("delete_file.csv", col_names  = TRUE))
        delete_file <- as.data.frame(rbind(delete_file, marked_rules))
        delete_file <- delete_file[!duplicated(delete_file), ]
        write.csv2(delete_file, file = "delete_file.csv", sep=";", row.names = FALSE)
      }
      else{
        write.csv2(marked_rules, file = "delete_file.csv", sep=";", row.names = FALSE)
      }
    })

希望这有帮助！

从应用程序中的DT和DT中的按钮中删除数据，闪亮的R

1 个答案: