R:将Plotly悬停模式设置为 "compare data on hover"

Question

我正在尝试使用Plotly软件包作为Shiny应用程序的一部分在R中创建堆积面积图，并希望比较悬停时的数据。但是，出于设计原因，我隐藏了模式栏，因此我需要在代码中声明此选项，因为当前仅针对与光标最近的数据点显示悬停。

但是，Plotly for R reference仅提供选项“x”(x轴上的工具提示)，“y”(y轴上的工具提示)，“最近”(显示与光标最近的数据点的工具提示)和FALSE(禁用工具提示)。

有什么方法可以做我想做的事吗？请注意，这个问题与this one完全相反。

我使用的代码是:

plot_ly(data2, 
        x = ~Year,
        y = ~B, 
        name = 'In-centre', 
        type = 'scatter', 
        mode = 'none', 
        fill = 'tozeroy', 
        fillcolor = '#F5FF8D', 
        hoverinfo = 'y') %>%
add_trace(y = ~A, 
          name = 'At home', 
          fillcolor = '#50CB86', 
          hoverinfo = 'y') %>% 
layout(xaxis = list(title = "", 
                    showgrid = FALSE, 
                    tickangle = 270, 
                    dtick = 1, 
                    tickfont = list(size = 11)),
       yaxis = list(title = "", 
                    ticklen = 8, 
                    tickcolor = "#EEEEEE", 
                    range = c(-2, 101), 
                    tick0 = 0, 
                    dtick = 10, 
                    tickfont = list(size = 11)),
       showlegend = TRUE,
       legend = list(x = 0, 
                     y = -0.2, 
                     orientation = "h", 
                     traceorder = "normal"),
        margin = list(t = 25, b = 50, r = 10, l = 40)) %>% 
config(displayModeBar = FALSE)

其中data2(的简化版本)为:

Year   A      B
2006   18.0   82.0
2007   19.2   78.3
2008   17.9   80.2
2009   20.1   77.7

Answer 1

将layout(hovermode = 'compare')添加到您的代码中:

data2 <- read.table(text="
Year   A      B
2006   18.0   82.0
2007   19.2   78.3
2008   17.9   80.2
2009   20.1   77.7
", header=T)

library(plotly)
library(dplyr)
plot_ly(data2, 
        x = ~Year,
        y = ~B, 
        name = 'In-centre', 
        type = 'scatter', 
        mode = 'none', 
        fill = 'tozeroy', 
        fillcolor = '#F5FF8D', 
        hoverinfo = 'y') %>%
add_trace(y = ~A, 
          name = 'At home', 
          fillcolor = '#50CB86', 
          hoverinfo = 'y') %>% 
layout(xaxis = list(title = "", 
                    showgrid = FALSE, 
                    tickangle = 270, 
                    dtick = 1, 
                    tickfont = list(size = 11)),
       yaxis = list(title = "", 
                    ticklen = 8, 
                    tickcolor = "#EEEEEE", 
                    range = c(-2, 101), 
                    tick0 = 0, 
                    dtick = 10, 
                    tickfont = list(size = 11)),
       showlegend = TRUE,
       legend = list(x = 0, 
                     y = -0.2, 
                     orientation = "h", 
                     traceorder = "normal"),
        margin = list(t = 25, b = 50, r = 10, l = 40)) %>% 
config(displayModeBar = FALSE) %>%
layout(hovermode = 'compare')

编辑
@OctavianCorlade给我发送了有关上面给出的解决方案的重要说明:“以前提供的答案有效，只是因为任何与可用选项不同的字符串都将产生相同的结果。 hovermode = 'x'是记录在案的方式，可以实现完全相同的结果” 。
因此，根据@OctavianCorlade的建议，可以使用:

layout(hovermode = 'x')