[英]Event data for plotly (scattergeo) maps in R Shiny
我正在构建一个闪亮的应用程序,但在绘制地图事件数据时遇到了一些麻烦。 我过去创建了一个散点图,并在plot_ly函数中定义了一个'key'变量。 如果单击散点图中的某个点,则将提取关键点,并将该关键点用于子集数据帧并生成后续图。 我在下面的代码中遵循相同的格式,但是密钥未存储在事件数据中。 事件数据仅包含“ curveNumber”和“ pointNumber”。 它似乎适用于此处的Choropleth映射: https ://plot.ly/r/shinyapp-map-click/,但我无法将其用于“ scattergeo”。
任何帮助将不胜感激。
library(shiny)
library(plotly)
ui <- shinyUI(fluidPage(
titlePanel("My Shiny App"),
sidebarLayout(
sidebarPanel(
numericInput("idnum", label = h3("ID #"),
value = 3)
),
mainPanel(
plotlyOutput("map"),
verbatimTextOutput("click")
)
)
))
server <- shinyServer(function(input, output) {
output$map <- renderPlotly({
df <- data.frame(id = c(3,6,20,35), lat = c(30.67,32.46,37.83,29.62), lon = c(-97.82, -62.34, -75.67, -85.62))
sub <- df[which(df$id == input$idnum),]
g <- list(
scope = 'north america',
showland = TRUE,
landcolor = toRGB("grey83"),
subunitcolor = toRGB("white"),
countrycolor = toRGB("white"),
showlakes = TRUE,
lakecolor = toRGB("white"),
showsubunits = TRUE,
showcountries = TRUE,
resolution = 50,
projection = list(
type = "miller",
rotation = list(lon = -100)
),
lonaxis = list(
showgrid = TRUE,
gridwidth = 0.5,
range = c(-140, -55),
dtick = 5
),
lataxis = list(
showgrid = TRUE,
gridwidth = 0.5,
range = c(20, 60),
dtick = 5
)
)
plot_ly(sub, lon = ~lon, lat = ~lat, key = ~id, text = ~paste(id), hoverinfo = "text",
marker = list(size = 10),
type = 'scattergeo',
locationmode = 'USA-states') %>%
layout(title = 'Locations', geo = g)
})
output$click <- renderPrint({
d <- event_data("plotly_click")
if (is.null(d)) "Click events appear here" else d
})
})
shinyApp(ui = ui, server = server)
一种获取密钥的解决方法是替换:
sub <- df[which(df$id == input$idnum),]
同
sub <- df[which(df$id == input$idnum),]
rownames(sub) <- sub$id
key <- row.names(sub)
看起来key
正在使用行名。
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