Question

我有以下示例flexdashboard：

---
title: "Hover"
output: 
  flexdashboard::flex_dashboard:
    orientation: columns
    vertical_layout: fill
runtime: shiny
---

```{r setup, include=FALSE}
library(flexdashboard)
library(tidyverse)
data(iris)

Column {data-width=650}
-----------------------------------------------------------------------

### Chart A

```{r}
iris %>% group_by(Species) %>% 
  summarise(mean = mean(Sepal.Length)) %>% 
  ggplot(aes(Species, mean)) + geom_col()

将鼠标悬停在图中的条形图上并显示其值时，我想要的是一个工具提示。我在SO concurrent future中阅读了这篇文章，但它适用于Shiny。我尝试过：

p <- iris %>% group_by(Species) %>% 
  summarise(mean = mean(Sepal.Length))

labels <- sprintf("<strong>%s</strong><br/>Mean: %f", 
                     p$Species, p$mean) %>% 
     lapply(htmltools::HTML)

p %>% ggplot(aes(Species, mean)) + geom_col() + geom_text(aes(label = labels))

这将创建一个具有种类和值的html工具，我没有的是悬停（可能是plot_hover？）来显示工具提示。

任何帮助将不胜感激

此致

Answer 1

这是一种方法。您必须定位到条的顶部中心才能获得工具提示。

---
title: "Untitled"
runtime: shiny
output: 
  flexdashboard::flex_dashboard:
    orientation: columns
    vertical_layout: fill
---

```{r setup, include=FALSE}
library(flexdashboard)
library(dplyr)
library(ggplot2)
library(shiny)
```

Column {data-width=650}
-----------------------------------------------------------------------

### Chart A

```{r}
dat <- iris %>% group_by(Species) %>% 
  summarise(mean = mean(Sepal.Length))
output[["ggplot"]] <- renderPlot({
  dat %>% 
  ggplot(aes(Species, mean)) + geom_col()
})
output[["hoverinfo"]] <- renderUI({ 
  hover <- input[["plot_hover"]]
  if(is.null(hover)) return(NULL)
  point <- nearPoints(dat, hover, threshold = 50, maxpoints = 1)
  if(nrow(point) == 0) return(NULL)
  left_px <- hover$coords_css$x
  top_px <- hover$coords_css$y
  style <- 
    paste0("position:absolute; z-index:100; background-color: rgba(245, 245, 245, 0.85); ",
           "left:", left_px, 
           "px; top:", top_px, "px;")
  # tooltip created as wellPanel
  tooltip <- paste0(
    "<b> Species: </b>", point[["Species"]], "<br/>",
    "<b> mean: </b>", point[["mean"]]
  )
  wellPanel(
    style = style, p(HTML(tooltip))
  )
}) 
plotOutput("ggplot", hover = hoverOpts("plot_hover"))
div(uiOutput("hoverinfo"), style = "pointer-events: none;")
```

Answer 2

我用shinyBs尝试了许多不同的选项，其他人描述了here，但是我在不使用runtime: shiny的情况下添加工具提示仍然有问题，所以我添加了

output:
    includes:
       in_header: my_custom.html

在 my_custom.html 我有：

<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<script>
$( function() {
  $( document ).tooltip(
    {
      position: {
        using: function( position, feedback ) {
          $( this ).css( position );
          $( "<div>" )
            .addClass( "arrow" )
            .addClass( feedback.vertical )
            .addClass( feedback.horizontal )
            .appendTo( this );
        }
      },
      show: {
        effect: "slideDown",
        delay: 500
      }
    }
  );
} );
</script>

可以找到其他样式选项here

悬停在JS中的flexdashboard图上或悬停动作时显示工具提示

2 个答案: