Creating interactive Leaflet map in R with shiny - r

Question

I created a shiny app with leaflet and it works pretty well.
library(shiny)
library(shinythemes)
library(leaflet)
ui2 <- fluidPage(theme = shinytheme("united"), tabsetPanel(
tabPanel(
titlePanel("titel"),
mainPanel(
leafletOutput(outputId = "mymap")),
sidebarPanel(
fluidRow(
dateRangeInput("a", h4("date"),language = "en",separator = " to "),
selectInput("select", h4("location"),
c(data8$city)),
submitButton("search"))
))
)
)
server <- function(input, output) {
popupa <- paste(titel)
output$mymap <- renderLeaflet({
leaflet(data8) %>%
addTiles() %>%
addMarkers(lng = ~lng, lat = ~lat, popup = popupa)
})
}
shinyApp(ui2, server)
But at the moment I am trying to add a dateRangeInput to filter(date_start) on my shown locations. But I don't know how to connect my dateRangeInput and the selectInput to my leaflet-function in the server-part. Furthermore, below the map there should be a table with the filtered locations from the map - is this possible at all?
My used dataframe looks like following:
title=c("Event1","Event2")
lng=c(23.3, 23.3)
lat=c(30, 40)
city=c("Berlin", "Hamburg" )
zip=c(39282, 27373)
date_start=c("2018-05-28","2018-05-28")
date_end=c("2018-06-27","2018-08-03")
data8 <- data.frame(title, lng, lat, city, zip, date_start, date_end)
Does anyone know how to get this done? Thanks for every help!
regards

Answer 1

You could try this:
ui2 <- fluidPage(theme = shinytheme("united"), tabsetPanel(
tabPanel(
titlePanel("titel"),
mainPanel(
leafletOutput(outputId = "mymap"),
dataTableOutput("mytable")),
sidebarPanel(
fluidRow(
dateRangeInput("a", h4("date"),language = "en",separator = " to "),
selectInput("selectLoc", h4("location"),
as.character(data8$city)),
submitButton("search"))
))
)
)
server <- function(input, output) {
popupa <- paste("titel")
datatoPlot <- reactive({
date_start <- as.character(input$a[1])
date_end <- as.character(input$a[2])
data8$date_start <- as.Date(data8$date_start, format = "%Y-%m-%d")
data8 <- data8[as.Date(data8$date_start) >= date_start & as.Date(data8$date_start) <= date_end, ]
data8 <- data8 %>% dplyr::filter(city == input$selectLoc)
})
output$mymap <- renderLeaflet({
leaflet(datatoPlot()) %>%
addTiles() %>%
addMarkers(lng = ~lng, lat = ~lat, popup = popupa)
})
output$mytable <- renderDataTable(datatoPlot())
}
shinyApp(ui2, server)