对于fileInput和textInput，闪亮的并排div

Question

以下尝试将Shiny fileInput()和textInput()并排放置。

一个简单的server.R文件：

shinyServer(function(input, output) {} )

以下ui.R：

# Custom function(s) to get file- and text-Input side by side
# Based on: <http://stackoverflow.com/a/21132918/1172302>

# options(shiny.error=browser)

# Globals

display.inline.block <- "display:inline-block"
class.input.small = "input-small"
FileInputId <- "SampleFile"
FileInputLabel <- "Sample"
TextInputId <- "SampleLabel"
TextInputLabel <- "Label"
TextInputLabelDefault <- "Sample Label"

# helper functions

fileInput.custom <- function (inputId, label, ...)
{
    tagList(tags$label(label, `for` = inputId),
            tags$input(id = inputId, type = "file", ...)
    )
}

textInput.custom <- function (inputId, label, value = "",...) 
{
    tagList(tags$label(label, `for` = inputId),
            tags$input(id = inputId, type = "text", value = value,...)
    )
}

filetextInput <- function (fileId, fileLabel, textId, textLabel, textValue, divstyle, ...)
{

    # sample file
    div(style = divstyle,
        fileInput.custom(inputId = fileId,
                      label = fileLabel,
                      class = class.input.small))

    # label for sample, to be used in plot(s)
    div(style = divstyle,
        textInput.custom(inputId = textId,
                      label = textLabel,
                      value = textValue,
                      class = class.input.small))

}

# Shiny UI

shinyUI(
  fluidPage(

    # sample input
    div(style = display.inline.block,
      fileInput.custom(inputId = FileInputId,
                label = FileInputLabel)
    ),

    # label for sample 
    div(style = display.inline.block,
      textInput.custom(inputId = TextInputId,
                label = TextInputLabel,
                value = TextInputLabelDefault)
    ),

    hr(),

    filetextInput(
        fileId = FileInputId,
        fileLabel = FileInputLabel,
        textId = TextInputId,
        textLabel = TextInputLabel,
        textValue = TextInputLabelDefault,
        divstyle = display.inline.block)

  )
)

以上结果如下：

如屏幕截图所示，它使用两个单独的div。为什么在filetextInput()函数的情况下它不起作用？

Answer 1

函数返回最后一个评估值，因此在您的情况下，第一部分将丢失。例如。 ：

function(){
"a"
"b"
}

返回“b”

所以你不想那样。使用div或tagList。

filetextInput <- function (fileId, fileLabel, textId, textLabel, textValue, divstyle, ...)
{
  div(
  # sample file
  div(style = divstyle,
      fileInput.custom(inputId = fileId,
                       label = fileLabel,
                       class = class.input.small)
      ),

  # label for sample, to be used in plot(s)
  div(style = divstyle,
      textInput.custom(inputId = textId,
                       label = textLabel,
                       value = textValue,
                       class = class.input.small)
      )
  )

}