密码输入后启动Shiny app(使用Shinydashboard)

Question

在这个主题中很好地解释了如何在输入一些密码后启动shinyapp.我正在尝试做同样的事情,但我想要一个"dashboardPage"而不是"navbarPage".

我试图将do.call函数形式'navbarPage'中的参数更改为'dashboardPage',但应用程序崩溃了.

rm(list = ls())
library(shiny)

Logged = FALSE;
my_username <- "test"
my_password <- "test"

ui1 <- function(){
  tagList(
    div(id = "login",
        wellPanel(textInput("userName", "Username"),
                  passwordInput("passwd", "Password"),
                  br(),actionButton("Login", "Log in"))),
    tags$style(type="text/css", "#login {font-size:10px;   text-align: left;position:absolute;top: 40%;left: 50%;margin-top: -100px;margin-left: -150px;}")
  )}

ui2 <- function(){tagList(tabPanel("Test"))}

ui = (htmlOutput("page"))
server = (function(input, output,session) {

  USER <- reactiveValues(Logged = Logged)

  observe({ 
    if (USER$Logged == FALSE) {
      if (!is.null(input$Login)) {
        if (input$Login > 0) {
          Username <- isolate(input$userName)
          Password <- isolate(input$passwd)
          Id.username <- which(my_username == Username)
          Id.password <- which(my_password == Password)
          if (length(Id.username) > 0 & length(Id.password) > 0) {
            if (Id.username == Id.password) {
              USER$Logged <- TRUE
            } 
          }
        } 
      }
    }    
  })
  observe({
    if (USER$Logged == FALSE) {

      output$page <- renderUI({
        div(class="outer",do.call(bootstrapPage,c("",ui1())))
      })
    }
    if (USER$Logged == TRUE) 
    {
      output$page <- renderUI({
        div(class="outer",do.call(dashboardPage,c(inverse=TRUE,title = "Contratulations you got in!",ui2())))
      })
      print(ui)
    }
  })
})

runApp(list(ui = ui, server = server))

Answer 1

如果我的代码足以让你开始走上"正确"的道路,那我就开始了.如果不是这样,请告诉我.

如果登录名和密码正确,下面的代码将显示一个shinydashboard.

但需要解决以下问题:

• css中存在问题.我认为你需要将为登录操作更改的css"重置"为shinydashboard的更标准(目前它全是白色的)
• 如果密码错误,第一个observe将在renderUI上继续"获胜"(有或没有第二个observe,严格来说不必要因此被删除),并且永远不会执行相对于错误登录的消息.

您可以尝试修复上述内容.

• 对于css,您可以重新设置它,或者优雅地以模态登录.
• 对于第二个,您可以将所有逻辑带入renderUI调用.这将确保所有案例都被执行.

但是,如果它足够清楚,请告诉我.

这是代码:

rm(list = ls())
library(shiny)
library(shinydashboard)

Logged = FALSE

my_username <- "test"
my_password <- "test"

ui1 <- function() {
  tagList(
    div(
      id = "login",
      wellPanel(
        textInput("userName", "Username"),
        passwordInput("passwd", "Password"),
        br(),
        actionButton("Login", "Log in")
      )
    ),
    tags$style(
      type = "text/css",
      "#login {font-size:10px;   text-align: left;position:absolute;top: 40%;left: 50%;margin-top: -100px;margin-left: -150px;}"
    )
  )
}

ui2 <- function() {
  tagList(dashboardHeader(),
          dashboardSidebar(),
          dashboardBody("Test"))
}


ui = (htmlOutput("page"))

server = function(input, output, session) {
  USER <- reactiveValues(Logged = Logged)

  observe({
    if (USER$Logged == FALSE) {
      if (!is.null(input$Login)) {
        if (length(input$Login) > 0) {
          Username <- isolate(input$userName)
          Password <- isolate(input$passwd)
          Id.username <- which(my_username == Username)
          Id.password <- which(my_password == Password)
          if (length(Id.username) > 0 &
              length(Id.password) > 0) {
            if (Id.username == Id.password) {
              USER$Logged <- TRUE
            }
          }
        }
      }
    }
  })

  output$page <- renderUI({
    if (USER$Logged == FALSE) {
      do.call(bootstrapPage, c("", ui1()))
    } else {
      do.call(dashboardPage, #c(inverse=TRUE,title = "Contratulations you got in!",
              ui2())
    }
  })
}

shinyApp(ui, server)

2017年10月30日更新

似乎上面的代码不再起作用了(感谢@ 5249203指出这一点).

我试图修复它,但我还没有设法让这个do.call功能起作用dashboardBody (如果有人知道某种方式,请告诉我!).

因此,由于最近的shiny功能,我以另一种方式解决了这个问题.

看看你的想法(当然,通常解决方案只是一个需要扩展的模板).

library(shiny)
library(shinydashboard)

Logged = FALSE
my_username <- "test"
my_password <- "test"

ui <- dashboardPage(skin='blue',
  dashboardHeader( title = "Dashboard"),
  dashboardSidebar(),
  dashboardBody("Test",
    # actionButton("show", "Login"),
  verbatimTextOutput("dataInfo")
    )
)

server = function(input, output,session) {

values <- reactiveValues(authenticated = FALSE)

# Return the UI for a modal dialog with data selection input. If 'failed' 
# is TRUE, then display a message that the previous value was invalid.
dataModal <- function(failed = FALSE) {
  modalDialog(
    textInput("username", "Username:"),
    passwordInput("password", "Password:"),
    footer = tagList(
      # modalButton("Cancel"),
      actionButton("ok", "OK")
    )
  )
}

# Show modal when button is clicked.  
# This `observe` is suspended only whith right user credential

obs1 <- observe({
  showModal(dataModal())
})

# When OK button is pressed, attempt to authenticate. If successful,
# remove the modal. 

obs2 <- observe({
  req(input$ok)
  isolate({
    Username <- input$username
    Password <- input$password
  })
  Id.username <- which(my_username == Username)
  Id.password <- which(my_password == Password)
  if (length(Id.username) > 0 & length(Id.password) > 0) {
    if (Id.username == Id.password) {
      Logged <<- TRUE
        values$authenticated <- TRUE
        obs1$suspend()
        removeModal()

    } else {
      values$authenticated <- FALSE
    }     
  }
  })


output$dataInfo <- renderPrint({
  if (values$authenticated) "OK!!!!!"
  else "You are NOT authenticated"
})

}

shinyApp(ui,server)