Adjust table generation and request to generate table in Shiny-CodePudding

Could help me with two small problems in the code below?

The first thing is that I'm not able to show the information in the table that I generate. The idea is to show the information corresponding to my Test database, but it doesn't appear. The second thing is that when I run the APP, the table is already generated, however this is strange, since in data_subset I insert req(input$daterange1).

Executable code below:

library(shiny)
library(shinythemes)

Test <- structure(list(date2 = c("2021-06-30","2021-06-30","2021-11-01","2021-11-02"), 
Category = c("FDE", "ABC", "FDE", "ABC"), 
coef = c(4, 1, 6, 1)), class = "data.frame",row.names = c(NA, -4L))


ui <- fluidPage(
  
  shiny::navbarPage(theme = shinytheme("flatly"), collapsible = TRUE,
                    br(),
                    tabPanel("",
                             sidebarLayout(
                               sidebarPanel(
                                 uiOutput('daterange'),
                                 br()
                                 
                               ),
                               mainPanel(
                                 dataTableOutput('table')

                               )
                             ))
  ))

server <- function(input, output,session) {
  
  data <- reactive(Test)
  
  output$daterange <- renderUI({
    dateRangeInput("daterange1", "Period you want to see:",
                   min = min(data()$date2),
                   max = max(data()$date2))
  })
  
  data_subset <- reactive({
    req(input$daterange1)
    req(input$daterange1[1] <= input$daterange1[2])
    days <- seq(input$daterange1[1], input$daterange1[2], by = 'day')
    subset(data(), date2 %in% days)
  })
  
 
  output$table <- renderDataTable({
    data_subset()
  })
  
}

shinyApp(ui = ui, server = server)

CodePudding user response：

In date2 %in% days, the class of days is Date while the class of date2 is character. I suggest to modify first you data.frame to define your dates as actual dates:

Test <- structure(list(date2 = as.Date(c("2021-06-30","2021-06-30","2021-11-01","2021-11-02")), 
Category = c("FDE", "ABC", "FDE", "ABC"), 
coef = c(4, 1, 6, 1)), class = "data.frame",row.names = c(NA, -4L))

and then to simply compare your dates.

    data_subset <- reactive({
        req(input$daterange1)
        req(input$daterange1[1] <= input$daterange1[2])
        subset(data(), date2 >= input$daterange1[1] & date2 <= input$daterange1[2])
)}

As for your second point, dateRangeInput provides, as a default the current date in the client's time zone... Hence, it is not NULL. You can alternatively add a button.