问题
cannot fix my problem for MULTIPLE filters/polygons. Currently my code works, but very slow, I do not use observe(), reactive(), and LeafletProxy(), because I stumbled.
I obviously checked this answer Changing Leaflet map according to input without redrawing and this one Making Shiny UI Adjustments Without Redrawing Leaflet Maps and leaflet tutorial Using Leaflet with Shiny
In my case I have four filters and do not quite understand how to combine them together and make the map fast.
My sample data:
Country Client Channel Status
Country 1 Client 1 Agent network Launched
Country 2 Client 2 Debit cards Launched
Country 3 Client 3 M-banking Planning
Country 4 Client 4 M-banking Launched
Country 5 Client 5 Agent network Launched
Country 6 Client 6 Agent network Launched
Country 7 Client 7 Agent network Pilot
This code works
# Packages
library(shiny)
library(shinythemes)
library(leaflet)
library(rgdal)
# Set working directory
setwd("C: /My Shiny apps")
# Read csv, which was created specifically for this app
projects <- read.csv("sample data10.csv", header = TRUE)
# Read a shapefile
countries <- readOGR(".","ne_50m_admin_0_countries")
# Merge data
projects.df <- merge(countries, projects, by.x = "name", by.y = "Country")
class(projects.df)
# Shiny code
# UI
ui <- fluidPage(theme = shinytheme("united"),
titlePanel("Map sample)"),
sidebarLayout(
sidebarPanel(
selectInput("countryInput", "Country",
choices = c("Choose country", "Country 1",
"Country 2",
"Country 3",
"Country 4",
"Country 5",
"Country 6",
"Country 7"),
selected = "Choose country"),
selectInput("clientInput", " Client",
choices = c("Choose Client", "Client 1",
"Client 2",
"Client 3",
"Client 4",
"Client 5",
"Client 6"),
selected = "Choose Client"),
selectInput("channeInput", "Channel",
choices = c("Choose Channel", "Agent network",
"M-banking", "Debit cards"),
selected = "Choose Channel"),
selectInput("statusInput", "Status",
choices = c("Choose status", "Launched",
"Pilot", "Planning"),
selected = "Choose status")
),
mainPanel(leafletOutput(outputId = 'map', height = 800)
)
)
)
server <- function(input, output) {
output$map <- renderLeaflet({
pal1 <- colorFactor(
palette = "Red",
domain = input$countryInput)
pal2 <- colorFactor(
palette = "Yellow",
domain = input$clientInput)
pal3 <- colorFactor(
palette = "Green",
domain = input$channelInput)
pal4 <- colorFactor(
palette = "Blue",
domain = input$statusInput)
# Create a pop-up
state_popup <- paste0("<strong>Country: </strong>",
projects.df$name,
"<br><strong> Client: </strong>",
projects.df$ Client,
"<br><strong> Channel: </strong>",
projects.df$Channel
"<br><strong>Status: </strong>",
projects.df$Status)
# Create a map
projects.map <- projects.df %>%
leaflet() %>%
addTiles("Stamen.Watercolor") %>%
setView(11.0670977,0.912484, zoom = 4) %>%
addPolygons(fillColor = ~pal1(projects.df$name),
popup = state_popup,
color = "#BDBDC3",
fillOpacity = 1,
weight = 1) %>%
addPolygons(fillColor = ~pal2(projects.df$Client),
popup = state_popup,
color = "#BDBDC3",
opacity = 1,
weight = 1) %>%
addPolygons(fillColor = ~pal3(projects.df$Channel),
popup = state_popup,
color = "#BDBDC3",
opacity = 1,
weight = 1) %>%
addPolygons(fillColor = ~pal4(projects.df$Status),
popup = state_popup,
color = "#BDBDC3",
opacity = 1,
weight = 1)
})
}
shinyApp(ui = ui, server = server)
Please help me to fix it with observe, reactive, and LeafletProxy and without redrawing map every time.
For me having these multiple filters/polygons make the situation really difficult.
Many thanks!
回答1:
I guess this is in line with what you are trying to achieve. I prefer have separate global, ui and server files. My sample project file is:
"","Country","Client","Channel","Status" "1","Croatia","Client 1","Agent network","Launched" "2","Germany","Client 2","Debit cards","Launched" "3","Italy","Client 3","M-banking","Planning" "4","France","Client 4","M-banking","Launched" "5","Slovenia","Client 5","Agent network","Launched" "6","Austria","Client 6","Agent network","Launched" "7","Hungary","Client 7","Agent network","Pilot"
global.R
library(shiny)
library(shinythemes)
library(leaflet)
library(rgdal)
# Set working directory
# Read csv, which was created specifically for this app
projects <- read.csv("sample data10.csv", header = TRUE)
# Read a shapefile
countries <- readOGR(".","ne_50m_admin_0_countries")
# Merge data
projects.df <- merge(countries, projects, by.x = "name", by.y = "Country")
ui.R
library(shiny)
library(shinythemes)
library(leaflet)
library(rgdal)
shinyUI(fluidPage(theme = shinytheme("united"),
titlePanel("Map sample"),
sidebarLayout(
sidebarPanel(
selectInput("countryInput", "Country",
choices = c("Choose country", "Croatia",
"Germany",
"Italy",
"France",
"Slovenia",
"Austria",
"Hungary"),
selected = "Choose country"),
selectInput("clientInput", " Client",
choices = c("Choose Client", "Client 1",
"Client 2",
"Client 3",
"Client 4",
"Client 5",
"Client 6"),
selected = "Choose Client"),
selectInput("channeInput", "Channel",
choices = c("Choose Channel", "Agent network",
"M-banking", "Debit cards"),
selected = "Choose Channel"),
selectInput("statusInput", "Status",
choices = c("Choose status", "Launched",
"Pilot", "Planning"),
selected = "Choose status")
),
mainPanel(leafletOutput(outputId = 'map', height = 800)
)
)
))
server.R
shinyServer(function(input, output) {
output$map <- renderLeaflet({
leaflet(projects.df) %>%
addProviderTiles(providers$Stamen.Watercolor) %>%
setView(11.0670977,0.912484, zoom = 4) #%>%
})
# observers
# selected country
selectedCountry <- reactive({
projects.df[projects.df$name == input$countryInput, ]
})
observe({
state_popup <- paste0("<strong>Country: </strong>",
selectedCountry()$name,
"<br><strong> Client: </strong>",
selectedCountry()$Client,
"<br><strong> Channel: </strong>",
selectedCountry()$Channel,
"<br><strong>Status: </strong>",
selectedCountry()$Status)
leafletProxy("map", data = selectedCountry()) %>%
clearShapes() %>%
addPolygons(fillColor = "red",
popup = state_popup,
color = "#BDBDC3",
fillOpacity = 1,
weight = 1)
})
# selected clients
selectedClient <- reactive({
tmp <- projects.df[!is.na(projects.df$Client), ]
tmp[tmp$Client == input$clientInput, ]
})
observe({
state_popup <- paste0("<strong>Country: </strong>",
selectedClient()$name,
"<br><strong> Client: </strong>",
selectedClient()$Client,
"<br><strong> Channel: </strong>",
selectedClient()$Channel,
"<br><strong>Status: </strong>",
selectedClient()$Status)
leafletProxy("map", data = selectedClient()) %>%
clearShapes() %>%
addPolygons(fillColor = "yellow",
popup = state_popup,
color = "#BDBDC3",
fillOpacity = 1,
weight = 1)
})
# selected channel
selectedChannel <- reactive({
tmp <- projects.df[!is.na(projects.df$Channel), ]
tmp[tmp$Channel == input$channeInput, ]
})
observe({
state_popup <- paste0("<strong>Country: </strong>",
selectedChannel()$name,
"<br><strong> Client: </strong>",
selectedChannel()$Client,
"<br><strong> Channel: </strong>",
selectedChannel()$Channel,
"<br><strong>Status: </strong>",
selectedChannel()$Status)
leafletProxy("map", data = selectedChannel()) %>%
clearShapes() %>%
addPolygons(fillColor = "green",
popup = state_popup,
color = "#BDBDC3",
fillOpacity = 1,
weight = 1)
})
# selected status
selectedStatus <- reactive({
tmp <- projects.df[!is.na(projects.df$Status), ]
tmp[tmp$Status == input$statusInput, ]
})
observe({
state_popup <- paste0("<strong>Country: </strong>",
selectedStatus()$name,
"<br><strong> Client: </strong>",
selectedStatus()$Client,
"<br><strong> Channel: </strong>",
selectedStatus()$Channel,
"<br><strong>Status: </strong>",
selectedStatus()$Status)
leafletProxy("map", data = selectedStatus()) %>%
clearShapes() %>%
addPolygons(fillColor = "blue",
popup = state_popup,
color = "#BDBDC3",
fillOpacity = 1,
weight = 1)
})
})
Let me know...
回答2:
There are a couple things you can do to set up your code, and a few things that need to be cleaned up.
First, make sure your output$map variable is your minimum viable map -- it should load the basemap, set the lat/lon, set the zoom, and that's about it. So it might look like:
output$map <- renderLeaflet({
leaflet('map') %>%
addTiles("Stamen.Watercolor") %>%
setView(11.0670977,0.912484, zoom = 4)
})
Then you can create a different output for each of your polygons using renderPlot and wrap it in a conditional statement:
output$country_one <- renderPlot({
if("Country 1" %in% input$"countryInput") {
leafletProxy('map') %>%
addPolygons(data = projects.df, fillColor = ~pal1(projects.df$name),
popup = paste0("<strong>Country: </strong>",
projects.df$name,
"<br><strong> Client: </strong>",
projects.df$ Client,
"<br><strong> Channel: </strong>",
projects.df$Channel
"<br><strong>Status: </strong>",
projects.df$Status),
color = "#BDBDC3",
fillOpacity = 1,
weight = 1)
}
)}
Then in your UI section, you call each output one after another:
leafletProxy('map')
plotOutput('country_one')
After cleaning up your palettes (domain must be numeric), your code might look like this:
# Packages
library(shiny)
library(shinythemes)
library(leaflet)
library(rgdal)
# Set working directory
setwd("C: /My Shiny apps")
# Read csv, which was created specifically for this app
projects <- read.csv("sample data10.csv", header = TRUE)
# Read a shapefile
countries <- readOGR(".","ne_50m_admin_0_countries")
# Merge data
projects.df <- merge(countries, projects, by.x = "name", by.y = "Country")
class(projects.df)
# Shiny code
# UI
ui <- fluidPage(theme = shinytheme("united"),
titlePanel("Map sample"),
sidebarLayout(
sidebarPanel(
selectInput("countryInput", "Country",
choices = c("Choose country", "Country 1","Country 2","Country 3","Country 4","Country 5","Country 6", "Country 7"),
selected = "Choose country"),
selectInput("clientInput", " Client",
choices = c("Choose Client", "Client 1","Client 2","Client 3","Client 4","Client 5","Client 6"),
selected = "Choose Client"),
selectInput("channeInput", "Channel",
choices = c("Choose Channel", "Agent network", "M-banking", "Debit cards"),
selected = "Choose Channel"),
selectInput("statusInput", "Status",
choices = c("Choose status", "Launched", "Pilot", "Planning"),
selected = "Choose status")
),
mainPanel(
leafletOutput('map'),
plotOutput('country_output'),
plotOutput('client_output'),
plotOutput('channel_output'),
plotOutput('status_output')
)
)
)
server <- function(input, output) {
pal1 <- colorFactor(palette = "Blues", domain = c(0, 100))
pal2 <- colorFactor(palette = "Blues", domain = c(0, 100))
pal3 <- colorFactor(palette = "Blues", domain = c(0, 100))
pal4 <- colorFactor(palette = "Blues", domain = c(0, 100))
output$map <- renderLeaflet({
leaflet('map') %>%
addTiles("Stamen.Watercolor") %>%
setView(11.0670977,0.912484, zoom = 4)
})
output$country_output <- renderPlot({
if("Country 1" %in% input$"countryInput") { # sample conditional statement
leafletProxy('map') %>% # initalize the map
clearGroup("polys") %>% # clear any previous polygons
addPolygons(fillColor = ~pal1(projects.df$name),
popup = paste0("<strong>Country: </strong>",projects.df$name,"<br><strong> Client: </strong>",projects.df$ Client,"<br><strong> Channel: </strong>",projects.df$Channel,"<br><strong>Status: </strong>", projects.df$Status),
color = "#BDBDC3", fillOpacity = 1, weight = 1, group = "polys")
}
})
output$client_output <- renderPlot({
leafletProxy('map') %>% # initalize the map
clearGroup("polys") %>% # clear any previous polygons
addPolygons(fillColor = ~pal2(projects.df$Client),
popup = paste0("<strong>Country: </strong>",projects.df$name,"<br><strong> Client: </strong>",projects.df$ Client,"<br><strong> Channel: </strong>",projects.df$Channel,"<br><strong>Status: </strong>", projects.df$Status),
color = "#BDBDC3", fillOpacity = 1, weight = 1, group = "polys")
})
output$channel_output <- renderPlot({
leafletProxy('map') %>% # initalize the map
clearGroup("polys") %>% # clear any previous polygons
addPolygons(fillColor = ~pal3(projects.df$Channel),
popup = paste0("<strong>Country: </strong>",projects.df$name,"<br><strong> Client: </strong>",projects.df$ Client,"<br><strong> Channel: </strong>",projects.df$Channel,"<br><strong>Status: </strong>", projects.df$Status),
color = "#BDBDC3", fillOpacity = 1, weight = 1, group = "polys")
})
output$status_output <- renderPlot({
leafletProxy('map') %>% # initalize the map
clearGroup("polys") %>% # clear any previous polygons
addPolygons(fillColor = ~pal4(projects.df$Status),
popup = paste0("<strong>Country: </strong>",projects.df$name,"<br><strong> Client: </strong>",projects.df$ Client,"<br><strong> Channel: </strong>",projects.df$Channel,"<br><strong>Status: </strong>", projects.df$Status),
color = "#BDBDC3", fillOpacity = 1, weight = 1, group = "polys")
})
}
shinyApp(ui = ui, server = server)
I can't test this because I don't have your geospatial data. So if you are encountering errors, it might be worth checking this code as well as your data source.
来源：https://stackoverflow.com/questions/46186014/changing-leaflet-map-according-to-input-without-redrawing-multiple-polygons