Question

我想将一个颜色选择器作为列类型放在rhandsontable应用中的shiny内。使用colourInput()包中的colourpicker，我可以将颜色选择器添加为独立输入，从HTML标记创建它们，或将它们放在HTML表中（请参阅下面的示例代码）。是否可以将颜色选择器输入控件添加到rhandsontable列？

最终目标是一个应用程序，允许用户从MS Excel等电子表格中复制数据并粘贴到rhandsontable对象中，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。该应用程序稍后将采用指定颜色的那些输入，执行计算和图形结果。

下面是一些显示两次失败尝试的示例代码。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，但我仍然无法理解。

最小例子

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)

使用screengrab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

这不完全是答案，但我相当肯定你不能在掌上电脑中使用闪亮的输入（你可以在数据表中看到this）。

以下是一些获取渲染输入的代码：

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<input>内的colourInput元素变成了一个动手的输入，阻止了闪亮的JS代码将其变成闪亮的输入。

如果你查看hot_col文档，你会看到一个类型的参数，它只有几个选项。我相信你只能用那些指法输入。

也许我错了，但我不认为你可以在一个掌上电脑中呈现一个闪亮的输入。

编辑：经过一番思考后我相信它是可能的，但它需要大量的javascript。你必须写一个渲染器函数，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，但我并不熟悉闪亮的JS内部。

edit2：我试着写一个渲染器函数，但它似乎仍然不起作用。我的猜测是不可能的：

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)

在rhandsontable单元格中插入控件输入和HTML小部件

1 个答案: