如何将列表元素从HTML/CSS中拉到R数据框架中？

Question

在运行下面的可重复代码时，通过从左侧面板拖动元素在右侧面板中生成目标输出。我正在尝试将这些列表元素输入到一个rendered中并显示在一个呈现的表中。底部的图像更好地解释了。这是怎么做的？

可复制代码：

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)

说明：

​

​

Answer 1

要达到您想要的结果，一个选项是使用以下sortable_js_capture_input方法

捕获sortable列表的状态。

并且是

与onSort选项sortable_js一起使用

(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)

​

​