如何将列表元素从 HTML/CSS 拉入 R 数据框？

Question

在下面的可重现代码运行中，目标输出是通过从左侧面板拖入元素在右侧面板中生成的。我正在尝试将这些列表元素提供给 R 数据框并在呈现的 table 中显示。底部的图片更好地解释了。这是怎么做到的？

可重现代码：

library(shiny)
library(sortable)
library(htmlwidgets)

icons <- function(x) {lapply(x,function(x){tags$div(tags$strong(x))})}

ui <- fluidPage(

  tags$head(
    tags$style(HTML('
      #drag_from > div {cursor: move; #fallback
                        cursor: grab; cursor: pointer;
                        }
      #drag_to > div {cursor: move; #fallback
                      cursor: grab; cursor: pointer;
                      }                
      #drag_to {list-style-type: none;  counter-reset: css-counter 0;}
      #drag_to > div {counter-increment: css-counter 1;}
      #drag_to > div:before {content: counter(css-counter) ". ";}
      ')
    )
  ),
  
  div(
    style = "margin-top: 2rem; width: 60%; display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: start;",

    div(
      div(
        class = "panel panel-default",
        div(class = "panel-heading", "Drag from here"),
        div(
          class = "panel-body",
          id = "drag_from",
          icons(c("A", "B", "C", "D", "E"))
        )
      ),
    ),
    div(
      div(
        class = "panel panel-default",
        div(class = "panel-heading", "Drag to here"),
        div(
          class = "panel-body",
          id = "drag_to"
        )
      )
    )
  ),
  sortable_js(
    "drag_from",
    options = sortable_options(
      group = list(
        pull = "clone",
        name = "group1",
        put = FALSE
      )
    )
  ),
  sortable_js(
    "drag_to",
    options = sortable_options(
      group = list(
        group = "group1",
        put = TRUE,
        pull = TRUE
      )
    )
  ),
  helpText(h5(strong("Output to table:"))),
  tableOutput("table1")
)

server <- function(input, output) {
  output$table1 <- renderTable({input$drag_to})
}

shinyApp(ui, server)

插图：

Answer 1

实现所需结果的一种选择是使用 sortable_js_capture_input 方法，该方法

captures the state of a sortable list

并且是

used with the onSort option of sortable_js

（参见 ?sortable_js_capture_input）。

library(shiny)
library(sortable)
library(htmlwidgets)

icons <- function(x) {
  lapply(x, function(x) {
    tags$div(tags$strong(x))
  })
}

ui <- fluidPage(
  tags$head(
    tags$style(HTML('
      #drag_from > div {cursor: move; #fallback
                        cursor: grab; cursor: pointer;
                        }
      #drag_to > div {cursor: move; #fallback
                      cursor: grab; cursor: pointer;
                      }
      #drag_to {list-style-type: none;  counter-reset: css-counter 0;}
      #drag_to > div {counter-increment: css-counter 1;}
      #drag_to > div:before {content: counter(css-counter) ". ";}
      '))
  ),
  div(
    style = "margin-top: 2rem; width: 60%; display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: start;",
    div(
      div(
        class = "panel panel-default",
        div(class = "panel-heading", "Drag from here"),
        div(
          class = "panel-body",
          id = "drag_from",
          icons(c("A", "B", "C", "D", "E"))
        )
      ),
    ),
    div(
      div(
        class = "panel panel-default",
        div(class = "panel-heading", "Drag to here"),
        div(
          class = "panel-body",
          id = "drag_to"
        )
      )
    )
  ),
  sortable_js(
    "drag_from",
    options = sortable_options(
      group = list(
        pull = "clone",
        name = "group1",
        put = FALSE
      )
    )
  ),
  sortable_js(
    "drag_to",
    options = sortable_options(
      group = list(
        group = "group1",
        put = TRUE,
        pull = TRUE
      ),
      onSort = sortable_js_capture_input(input_id = "selected")
    )
  ),
  helpText(h5(strong("Output to table:"))),
  tableOutput("table1")
)

server <- function(input, output) {
  output$table1 <- renderTable({
    input$selected
  })
}

shinyApp(ui, server)

如何将列表元素从 HTML/CSS 拉入 R 数据框？

How to pull list elements from HTML/CSS and into an R data frame?

html

css

r

dataframe

shiny