我想知道如何根据输入的变化来改变Shiny和Leaflet来绘制点,而不重绘整个地图.
我正在使用的代码是:
library(leaflet)
library(shiny)
library(dplyr)
library(readr)
ui <- fluidPage(
titlePanel("Melbourne Urban Tree Visualisation"),
leafletOutput("treedat"),
uiOutput("precinct")
#Giving an input name and listing out types to choose in the Shiny app
)
server <- function(input, output){
#td <- read.csv("treedata.csv", header = TRUE)
#pal <- colorNumeric(
#palette = "RdYlGn",
#domain = td$LifeExpectencyValue
#)
output$precinct <- renderUI({
choices <- as.character(unique(td$Precinct))
choices <- c('All', choices)
selectInput(inputId = "precinct", label = "Precinct", choices = choices, selected = "CBD")
})
output$treedat <- renderLeaflet({
#if(is.null(td)) return()
## get …