R Shiny，如何使数据表对数据表中的复选框做出反应 [英] R Shiny, how to make datatable react to checkboxes in datatable

问题描述

我希望数据表显示的内容取决于表中复选框的状态。我找到了两者的帮助，包括DT中的复选框以及更改数据表的内容，但是当我尝试将这些解决方案结合在一起时，却没有得到想要的东西。选中一个框时，该表将重绘两次，这是我想要的方式第一次重绘，但稍后又切换回去。

I would like my datatable to display content which depends on the status of checkboxes contained in the table. I have found help with both, including checkboxes in a DT as well as changing data table content, but when I try and combine these solutions I don't get what I want. When checking a box, the table is redrawn twice, the first time the way I want but a moment later it switches back.

这是应该几乎做...在我发疯之前是否有人来帮忙？

This is the code which should almost do... Is there someone out there to help before I get crazy?

library(shiny)
library(DT)
shinyApp(
  ui = fluidPage(
    DT::dataTableOutput('x1'),
    verbatimTextOutput('x2')
  ),

  server = function(input, output, session) {
    # create a character vector of shiny inputs
    shinyInput = function(FUN, len, id, ...) {
      inputs = character(len)
      for (i in seq_len(len)) {
        inputs[i] = as.character(FUN(paste0(id, i), label = NULL, ...))
      }
      inputs
    }

    # obtain the values of inputs
    shinyValue = function(id, len) {
      unlist(lapply(seq_len(len), function(i) {
        value = input[[paste0(id, i)]]
        if (is.null(value)) TRUE else value
      }))
    }

    n = 6
    df = data.frame(
      cb = shinyInput(checkboxInput, n, 'cb_', value = TRUE, width='1px'),
      month = month.abb[1:n],
      YN = rep(TRUE, n),
      ID = seq_len(n),
      stringsAsFactors = FALSE)

    loopData = reactive({
      df$YN <<- shinyValue('cb_', n)
      df
    })

    output$x1 = DT::renderDataTable(
      isolate(loopData()),
      escape = FALSE, selection = 'none',
      options = list(
        dom = 't', paging = FALSE, ordering = FALSE,
        preDrawCallback = JS('function() {    Shiny.unbindAll(this.api().table().node()); }'),
        drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } ')#,
      ))

    proxy = dataTableProxy('x1')

    observe({
      replaceData(proxy, loopData())
    })

    output$x2 = renderPrint({
      data.frame(Like = shinyValue('cb_', n))
    })
  }
)

推荐答案

是的，您的示例代码几乎有效。唯一不对的是， df $ cb 的值也需要更改。

Yes, your example code almost works. The only thing not right is that the value of df$cb needs to be changed, too.

例如，假设您单击了第二行，并且 input $ cb_2 被更改。 Shiny会记录 input $ cb_2 更改为 FALSE 。由于 df $ cb [[2]] 的值仍为 checkbox（...，value = TRUE） ，重新绘制表格时，将显示一个选中的复选框，R认为 input $ cb_2 再次被更改，因此您的数据将相应地更改。

For example, let's say you clicked the second row and input$cb_2 gets changed. shiny would record that input$cb_2 got changed to FALSE. Since the value of df$cb[[2]] was still checkbox(..., value = TRUE), when the table gets re-drawed, a checked checkbox would be displayed and R thought that input$cb_2 got changed again and so your data would be altered correspondly.

检查示例代码中是否有未清除的内容。

Checked the example code if there's anything uncleared.

library(shiny)
library(DT)
shinyApp(
  ui = fluidPage(
    DT::dataTableOutput('x1'),
    verbatimTextOutput('x2')
  ),

  server = function(input, output, session) {
    # create a character vector of shiny inputs
    shinyInput = function(FUN, len, id, value, ...) {
      if (length(value) == 1) value <- rep(value, len)
      inputs = character(len)
      for (i in seq_len(len)) {
        inputs[i] = as.character(FUN(paste0(id, i), label = NULL, value = value[i]))
      }
      inputs
    }

    # obtain the values of inputs
    shinyValue = function(id, len) {
      unlist(lapply(seq_len(len), function(i) {
        value = input[[paste0(id, i)]]
        if (is.null(value)) TRUE else value
      }))
    }

    n = 6
    df = data.frame(
      cb = shinyInput(checkboxInput, n, 'cb_', value = TRUE, width='1px'),
      month = month.abb[1:n],
      YN = rep(TRUE, n),
      ID = seq_len(n),
      stringsAsFactors = FALSE)

    loopData = reactive({
      df$cb <<- shinyInput(checkboxInput, n, 'cb_', value = shinyValue('cb_', n), width='1px')
      df$YN <<- shinyValue('cb_', n)
      df
    })

    output$x1 = DT::renderDataTable(
      isolate(loopData()),
      escape = FALSE, selection = 'none',
      options = list(
        dom = 't', paging = FALSE, ordering = FALSE,
        preDrawCallback = JS('function() { Shiny.unbindAll(this.api().table().node()); }'),
        drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } ')
      ))

    proxy = dataTableProxy('x1')

    observe({
      replaceData(proxy, loopData(), resetPaging = FALSE)
    })

    output$x2 = renderPrint({
      data.frame(Like = shinyValue('cb_', n))
    })
  }
)

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