如何让R语言plotly地图悬停文本仅显示国家名称

你当前的代码中，Plotly默认会在弹窗里自动附加z列的数字值、locations对应的ISO代码，即便设置了text = ~mapname也无法覆盖这些默认显示项。要实现仅显示国家名称，只需通过两个参数精确控制弹窗内容：

修改后的完整代码 #

# Plotly 地图
library(plotly)
library(dplyr) # 加载dplyr以使用rename函数

countrylabeldata <- iso3166
countrylabeldata <- rename(countrylabeldata, "iso-a3" = a3)

Swahili_countries <- c("BDI","OMN", "RWA","SSD", "SOM", "MDG", "ZMB")
Official_Swahili_countries <- c("TZA", "UGA", "KEN", "COD")

countrylabeldata$include <- ifelse(countrylabeldata$`iso-a3` %in% Swahili_countries, 1, 0)
countrylabeldata$include <- ifelse(countrylabeldata$`iso-a3` %in% Official_Swahili_countries, 2, countrylabeldata$include)

ncols <- 3
zseq <- seq(0,1,length.out=ncols+1)
cols <- c("lightgrey", "red","purple")

colorScale <- data.frame(
     z = c(0,rep(zseq[-c(1,length(zseq))],each=2),1),
     col=rep(cols,each=2)
)   
colorScale$col <- as.character(colorScale$col)

g <- list(
  showframe = FALSE,
  showcoastlines = FALSE,
  projection = list(type = 'orthographic')
)

fig <- plot_geo(countrylabeldata) %>% 
  add_trace(
    z = ~include, 
    color = ~include, 
    colorscale=colorScale,
    text = ~mapname, 
    locations = ~`iso-a3`,
    hoverinfo = 'text', # 关键：指定弹窗仅显示text内容
    texttemplate = '%{text}', # 明确弹窗显示模板为国家名称
    colorbar=list(tickmode='array', 
                  title="Level of Swahili Spoken", 
                  tickvals=c(.3,1.0,1.7), 
                  ticktext=c("Not Widely Spoken","Spoken","Official Language"),
                  ticklen=.1)
  ) %>% 
  layout(
    title = 'Swahili Speaking Countries',
    geo = g,
    margin = list(l = 20, r = 20, b = 20, t = 50),
    annotations = list(x = 1.4, y = .2, 
                       text = 'Source:CIA World Factbook',
                       xref='paper', yref='paper', showarrow = F, 
                       xanchor='right', yanchor='auto', xshift=0, yshift=0,
                       font = list(size = 10))
  ) %>% 
  colorbar(title = "Swahili", x = 1, y = 0.75)

fig

关键改动说明 #

1. hoverinfo = 'text'：强制Plotly弹窗只展示text参数指定的内容，屏蔽默认附加的z值、ISO代码等信息。
2. texttemplate = '%{text}'：进一步明确弹窗的显示模板，确保完全仅渲染国家名称，避免任何额外内容。
3. 补充加载dplyr包：原代码中的rename函数依赖该包，不加载会导致报错。

内容的提问来源于stack exchange，提问作者user20934000