在闪亮的 rhandsontable 单元格中插入控制输入和 HTML 小部件

Question

我想将颜色选择器作为列类型放入 rhandsontable 中的 shiny 应用程序中。使用 colourpicker 包中的 colourInput()，我可以将颜色选择器添加为独立输入，从 HTML 标记创建它们，或者将它们放入 HTML 表中（参见下面的示例代码）。是否可以将颜色选择器输入控件添加到 rhandsontable 列？

最终目标是一个允许用户从 MS Excel 等电子表格复制数据并粘贴到 rhandsontable 对象的应用程序，包括指定颜色名称或十六进制代码的文本。用户可以通过覆盖文本或通过光标操作从选择器中选择颜色来编辑颜色。该应用稍后会接受这些输入、执行计算并以指定的颜色绘制结果。

下面是一些示例代码，显示了两次失败的尝试。任何意见，将不胜感激。另外，我对 JavaScript 一无所知。 colourpicker 和 rhandsontable 小插曲是很好的资源，但我还是想不通。

小例子

library(shiny); library(rhandsontable); library(colourpicker)

hotDF <- data.frame(Value = 1:4, Status = TRUE, Name = LETTERS[1:4],
                    Date = seq(from = Sys.Date(), by = "days", length.out = 4),
                    Colour = sapply(1:4, function(i) {
                      paste0(
                      '<div class="form-group shiny-input-container" 
                          data-shiny-input-type="colour">
                      <input id="myColour',i,'" type="text" 
                      class="form-control shiny-colour-input" data-init-value="#FFFFFF"
                      data-show-colour="both" data-palette="square"/>
                        </div>'
                      )}), stringsAsFactors = FALSE) 

testColourInput <- function(DF){
  ui <- shinyUI(fluidPage( rHandsontableOutput("hot") ))   
  server <- shinyServer(function(input, output) {

    DF2 <- transform(DF, Colour =  c(sapply(1:4, function(x) {
      jsonlite::toJSON(list(value = "black"))
    })))    #create DF2 for attempt #2

    output$hot <- renderRHandsontable({
      #Attempt #1 = use the HTML renderer
      #Results in no handsontable AND no HTML table <-- why no HTML table too?
      rhandsontable(DF) %>%  hot_col(col = "Colour", renderer = "html")

      #Attempt #2 = use colourWidget
      #Results are the same as above.
      #rhandsontable(DF2) %>% 
      #   hot_col(col = "Colour", renderer = htmlwidgets::JS("colourWidget"))         
    })
  }) #close shinyServer     
  runApp(list(ui=ui, server=server))  
} #close testColorInput function

testColourInput(DF = hotDF)

屏幕抓取的扩展示例：

library(shiny); library(rhandsontable); library(colourpicker)

#Colour cells ideally would be a colourInput() control similar to the Date input control
hotDF <- data.frame(Value = 1:4, Status = TRUE, Name = LETTERS[1:4],
                    Date = seq(from = Sys.Date(), by = "days", length.out = 4),
                    Colour = sapply(1:4, function(i) {
                      paste0(
                        '<div class="form-group shiny-input-container" 
                             data-shiny-input-type="colour">
                            <input id="myColour',i,'" type="text" 
                                class="form-control shiny-colour-input" 
                                data-init-value="#FFFFFF" 
                                data-show-colour="both" data-palette="square"/>
                        </div>'
                      )}),
                    stringsAsFactors = FALSE) 

testColourInput <- function(DF){
  ui <- shinyUI(fluidPage(

    sidebarLayout(
      sidebarPanel(
        #Standalone colour Input
        colourInput("myColour", label = "Just the color control:", value = "#000000"),
        br(),
        HTML("Build the colour Input from HTML tags:"), br(),
        HTML(paste0(
          "<div class='form-group shiny-input-container' 
             data-shiny-input-type='colour'>
          <input id='myColour", 999,"' type='text' 
             class='form-control shiny-colour-input' 
             data-init-value='#FFFFFF' data-show-colour='both' 
             data-palette='square'/>
          </div>"

        ))
      ),

      mainPanel(  
        HTML("Failed attempt"),
        rHandsontableOutput("hot"), 
        br(), br(),
        HTML("Success, but this is not a rhandsontable"),
        uiOutput("tableWithColourInput")    
      )
    )
  ))

  server <- shinyServer(function(input, output) {

    #create DF2 for attempt #2
    DF2 <- transform(DF, Colour =  c(sapply(1:4, function(x) {
                        jsonlite::toJSON(list(value = "black"))
                    })))

    output$hot <- renderRHandsontable({
      #Attempt #1 = use the HTML renderer
      #Results in no handsontable AND no HTML table <-- why no HTML table too?
      rhandsontable(DF) %>%  hot_col(col = "Colour", renderer = "html")

      #Attempt #2 = use colourWidget
      #Results are the same as above.
      #rhandsontable(DF2) %>% 
      #  hot_col(col = "Colour", renderer = htmlwidgets::JS("colourWidget"))

      #Uncomment below to see the table without html formatting
      #rhandsontable(DF) 
        #^This line was uncommented to obtain the screengrab

    })

    #HTML table
    myHTMLtable <- data.frame(Variable = LETTERS[1:4],
                              Select = NA)

    output$tableWithColourInput <- renderUI({
      #create table cells
      rowz <- list() 
        #Fill out table cells [i,j] with static elements
        for( i in 1:nrow( myHTMLtable )) {
          rowz[[i]] <- tags$tr(lapply( myHTMLtable[i,1:ncol(myHTMLtable)],
                         function( x ) { tags$td( HTML(as.character(x)) ) }
                       ) )
        }
        #Add colourInput() to cells in the "Select" column in myHTMLtable
        for( i in 1:nrow( myHTMLtable ) ) {
          #Note: in the list rowz:
          #  i = row; [3] = row information; children[1] = table cells (list of 1); 
          #  $Select = Column 'Select' 
          rowz[[i]][3]$children[[1]]$Select <- tags$td( 
            colourInput(inputId = as.character(paste0("inputColour", i)), 
                        label = NULL, value = "#000000")
          ) 
        } 
      mybody <- tags$tbody( rowz )

      tags$table( 
        tags$style(HTML(
          ".shiny-html-output th,td {border: 1px solid black;}"
          )),
        tags$thead( 
          tags$tr(lapply( c("Variable!", "Colour!"), function( x ) tags$th(x)))
        ),
        mybody
      ) #close tags$table
    }) #close renderUI

  }) #close shinyServer

  runApp(list(ui=ui, server=server))  
} #close testColorInput function

testColourInput(DF = hotDF)

Answer 1

这不是一个确切的答案，但我相当肯定你不能在 handsontable 内使用闪亮的输入（你可以在数据表内看到 this）。

下面是一些获取要渲染的输入的代码：

library(shiny); library(rhandsontable); library(colourpicker)

DF <- data.frame(Value = 1:4, Status = TRUE, Name = LETTERS[1:4],
                    Date = seq(from = Sys.Date(), by = "days", length.out = 4),
                    Colour = sapply(1:4, function(i) {
                      as.character(colourInput(paste0("colour",i),NULL))
                      }), stringsAsFactors = FALSE) 

ui <- shinyUI(fluidPage( rHandsontableOutput("hot"),
                         verbatimTextOutput("test")))   
server <- shinyServer(function(input, output) {

  output$hot <- renderRHandsontable({
    rhandsontable(DF,allowedTags = "<div><input>") %>% 
      hot_col(5, renderer = htmlwidgets::JS("html")) %>%
      hot_col(5, renderer = htmlwidgets::JS("safeHtmlRenderer"))     
  })

  output$test <- renderPrint({
    sapply(1:4, function(i) {
      input[[paste0("colour",i)]]
    })
  })


})

shinyApp(ui=ui,server=server)

问题是colourInput 内部的<input> 元素变成了可动手操作的输入，这会阻止闪亮的JS 代码将其变成闪亮的输入。

如果您查看hot_col 文档，您会看到一个类型参数，它只有几个选项。我相信您只能使用那些可动手做的输入。

也许我错了，但我认为您不能在掌上电脑中呈现闪亮的输入。

编辑： 经过一番思考，我相信这是可能的，但这需要大量的 javascript。您实际上必须编写一个渲染器函数，从头开始重新创建闪亮的输入。也许在闪亮的 javascript 代码中有一个函数可以做到这一点，但我对闪亮的 JS 内部并不是很熟悉。

edit2：我试着写了一个渲染器函数，但它似乎仍然不起作用。我的猜测是这是不可能的：

library(shiny); library(rhandsontable); library(colourpicker)

DF <- data.frame(Value = 1:4, Status = TRUE, Name = LETTERS[1:4],
                    Date = seq(from = Sys.Date(), by = "days", length.out = 4),
                    Colour = 1:4
                      }), stringsAsFactors = FALSE) 

ui <- shinyUI(fluidPage( rHandsontableOutput("hot"),
                         verbatimTextOutput("test")))   
server <- shinyServer(function(input, output) {

  output$hot <- renderRHandsontable({
    rhandsontable(DF,allowedTags = "<div><input>") %>% 
      hot_col(5, renderer = htmlwidgets::JS("
        function(instance, td, row, col, prop, value, cellProperties) {

    var y = document.createElement('input');
    y.setAttribute('id','colour'+ value);y.setAttribute('type','text');
    y.setAttribute('class','form-control shiny-colour-input');
    y.setAttribute('data-init-value','#FFFFFF');
    y.setAttribute('data-show-colour','both');
    y.setAttribute('data-palette','square');

    td.appendChild(y);
    return td;
}
                                            "))    
  })

  output$test <- renderPrint({
    sapply(1:4, function(i) {
      input[[paste0("colour",i)]]
    })
  })


})

shinyApp(ui=ui,server=server)