css - 选择输入旁边的放置按钮

目标
我想把一个selectInput和一个actionButton并排放在我的shinydashboard::box的页脚里。无论盒子的宽度是多少，按钮都应该“相对靠近”selectInput。
我到目前为止所做的努力
到目前为止，我尝试了column、splitLayout或通过display: inline-block进行样式设置，但我对以下两种解决方案都不满意：
column：根据盒子的宽度，selectInput和actionButton之间的间隙太大（我可以通过将selectInput宽度扩展到100%来部分解决这个问题，但是宽度太大）
splitDesign：到目前为止是最好的选择，但是cellWidths需要根据boxwidth进行调整，并且只能使用100%的selectInput宽度，对于大的box，第二个分割的宽度似乎太大
inline-block：不能很好地处理一般的CSS
例子

library(shiny)
library(purrr)
library(shinydashboard)

widths <- c(1, 2,3, 4, 6, 12)

makeBoxes <- function(width, method = c("split", "col", "css")) {
   method <- match.arg(method)
   split <- function(width, count) {
      splitLayout(selectInput(paste("sel", width, count, sep = "_"), NULL, LETTERS,
                              width = "100%"),
                  actionButton(paste("ab", width, count, sep = "_"), icon("trash")),
                  cellWidths = c("87.5%", "12.5%"),
                  cellArgs = list(style = "vertical-align: top"))
   }
   col <- function(width, count) {
      fluidRow(column(width = 11,
                      selectInput(paste("sel", width, count, sep = "_"), NULL, LETTERS,
                                  width = "100%")),
               column(width = 1,
                      actionButton(paste("ab", width, count, sep = "_"), icon("trash"))))
   }

   css <- function(width, count) {
      fluidRow(div(selectInput(paste("sel", width, count, sep = "_"), NULL, LETTERS),
                   style = "display: inline-block; vertical-align: top"),
               actionButton(paste("ab", width, count, sep = "_"), icon("trash")))
   }

   wrap <- function(method, ...)
      switch(method, split = split(...), col = col(...), css = css(...))

   map(seq(1, 12 / width, 1), function(count)
      box(solidHeader = TRUE, title = "Box", status = "info", width = width,
          footer = wrap(method, width, count)))
}

server <- function(input, output) {
}

ui1 <- dashboardPage(dashboardHeader(), dashboardSidebar(),
                     dashboardBody(map(widths, ~ fluidRow(makeBoxes(.x, "split")))))
ui2 <- dashboardPage(dashboardHeader(), dashboardSidebar(),
                     dashboardBody(map(widths, ~ fluidRow(makeBoxes(.x, "col")))))
ui3 <- dashboardPage(dashboardHeader(), dashboardSidebar(),
                     dashboardBody(map(widths, ~ fluidRow(makeBoxes(.x, "css")))))

shinyApp(ui1, server)
shinyApp(ui2, server)
shinyApp(ui3, server)

最佳答案

我希望这能有用。我把宽度改为11到12，我觉得很好。
这就是你想要的吗？

library(shiny)
library(purrr)
library(shinydashboard)

widths <- c(1, 2,3, 4, 6, 12)

makeBoxes <- function(width, method = c("split", "col", "css")) {
method <- match.arg(method)
split <- function(width, count) {
  splitLayout(selectInput(paste("sel", width, count, sep = "_"), NULL, LETTERS,
                          width = "100%"),
              actionButton(paste("ab", width, count, sep = "_"), icon("trash")),
              cellWidths = c("87.5%", "12.5%"),
              cellArgs = list(style = "vertical-align: top"))
}
col <- function(width, count) {
  fluidRow(column(width = 12,  # width = 11 -> 12
                  selectInput(paste("sel", width, count, sep = "_"), NULL, LETTERS,
                              width = "100%")),
           column(width = 1,
                  actionButton(paste("ab", width, count, sep = "_"), icon("trash"))))
}

 css <- function(width, count) {
  fluidRow(div(selectInput(paste("sel", width, count, sep = "_"), NULL, LETTERS),
               style = "display: inline-block; vertical-align: top"),
           actionButton(paste("ab", width, count, sep = "_"), icon("trash")))
}

 wrap <- function(method, ...)
  switch(method, split = split(...), col = col(...), css = css(...))

map(seq(1, 12 / width, 1), function(count)
  box(solidHeader = TRUE, title = "Box", status = "info", width = width,
      footer = wrap(method, width, count)))
}

server <- function(input, output) {
}

ui2 <- dashboardPage(dashboardHeader(), dashboardSidebar(),
                 dashboardBody(map(widths, ~ fluidRow(makeBoxes(.x, "col")))))

shinyApp(ui2, server)