Question

我正在制作一个闪亮的应用程序，用户需要在其中选择表格中的下拉选项。我正在使用rhandsontable，但是似乎只能为一个列设置一组下拉选项。因此，第1行与第800行具有相同的选项。我希望第1行与第800行具有不同的下拉选项集。

有没有办法做到这一点？

我已经考虑过创建单独的表并将它们推在一起看起来像一个表。只有第一个表将具有列标题，而其下的所有其他表将没有列标题。我试图避免这种情况，因为流变台具有水平和垂直滚动条，并且没有办法在多个表之间同步滚动条。这会使“一张桌子”看起来有些偏离。实际上，将所有数据都放在一个表中会看起来和功能更好。

我在下面有一个非常简单的例子：

  require(shiny)
  require(rhandsontable)

  ui <- fluidPage(
    hr(""),

    # Display table
    mainPanel(rHandsontableOutput("ExampleTable"))
  )

  server <- function(input, output) {

    output$ExampleTable <- renderRHandsontable({

      # creating table that will be displayed 
      df <- data.frame(Object = c("car", "car", "car", "house", "house", "house"), Needs = NA, stringsAsFactors = FALSE)

      # defining dropdown options
      dropdownOptions <- c("tires", "wipers", "headlights", "gutters", "carpet")

      rhandsontable(df, rowHeaders = NULL, stretchH = "all") %>%
        hot_col("Object", readOnly = TRUE) %>%
        hot_col("Needs", type = "dropdown", source = dropdownOptions)

    })
  }

  # Run the application 
  shinyApp(ui = ui, server = server)

我希望对于“对象”列的值为“汽车”的所有行，下拉选项仅包括“轮胎”，“雨刮器”和“前灯”。由于汽车永远不需要装订线或地毯，因此我不希望用户能够选择这些选项中的任何一个。

对于“ house”是“对象”列中值的每一行，用户应该只在下拉菜单中显示两个选项：“装订线”和“地毯”。这将有助于避免用户错误。

Answer 1

这是基于我分享的here（和上面提到的@Ben）的示例的有效解决方案：

library(shiny)
library(rhandsontable)

ui <- fluidPage(
  hr(),
  # Display table
  mainPanel(rHandsontableOutput("ExampleTable"))
)

server <- function(input, output) {

  # creating table that will be displayed 
  DF <- reactiveVal(data.frame(Object = c("car", "car", "car", "house", "house", "house"), Needs = NA_character_, stringsAsFactors = FALSE))

  # update df() on user changes
  observeEvent(input$ExampleTable, {
    DF(hot_to_r(input$ExampleTable))
  })

  output$ExampleTable <- renderRHandsontable({

    # defining dropdown options
    carOptions <- c(NA_character_, "tires", "wipers", "headlights")
    houseOptions <- c(NA_character_, "gutters", "carpet")

    tmpExampleTable <- rhandsontable(DF(), rowHeaders = NULL, stretchH = "all", selectCallback = TRUE, width = 300, height = 300) %>%
      hot_col("Object", readOnly = TRUE) %>%
      hot_col("Needs", allowInvalid = FALSE, type = "dropdown", source = NA_character_, readOnly = TRUE)

    if(!is.null(input$ExampleTable_select$select$r)){

      selectedObject <- DF()[input$ExampleTable_select$select$r, "Object"]

      if(selectedObject == "car"){
        tmpExampleTable <- hot_col(tmpExampleTable, col = "Needs", allowInvalid = FALSE, type = "dropdown", source = carOptions) %>% hot_cell(row = input$ExampleTable_select$select$r, col = "Needs", readOnly = FALSE)
      }

      if(selectedObject == "house"){
        tmpExampleTable <- hot_col(tmpExampleTable, col = "Needs", allowInvalid = FALSE, type = "dropdown", source = houseOptions) %>% hot_cell(row = input$ExampleTable_select$select$r, col = "Needs", readOnly = FALSE)
      }
    }

    tmpExampleTable

  })
}

# Run the application 
shinyApp(ui = ui, server = server)

1 个答案: