输入密码后启动Shiny应用程序(使用Shinydashboard)
在本主题中,很好地解释了输入一些密码后如何启动Shinyapp。我试图做同样的事情,但是我想有一个“
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。
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$page <- renderUI({
div(class="outer",do.call(dashboardPage,c(inverse=TRUE,title = "Contratulations you got in!",ui2())))
})
print(ui)
}
})
})
runApp(list(ui = ui, server = server))
回答:
如果我的代码足以使您从“正确的”道路上开始,我会感到好奇。如果不是这种情况,请告诉我。
如果登录名和密码正确,则下面的代码将显示一个闪亮的仪表板。
但需要解决以下问题:
- CSS中有问题。我认为您需要将登录操作更改的CSS重置为Shinydashboard的更标准配置(当前为全白色)
- 如果密码错误,则第一个密码
observe
将继续在renderUI上“赢得”(带有或没有第二个密码observe
,严格来说是不必要的,因此消除了),并且永远不会执行与错误登录有关的消息。
您可以尝试多种方法来解决上述问题。
- 对于CSS,您可以重新设置它,也可以在模式中优雅地登录。
- 对于第二个,也许您可以将所有逻辑带入renderUI调用。这样可以确保所有情况都已执行。
但是请让我知道是否足够清楚。
这是代码:
rm(list = ls())library(shiny)
library(shinydashboard)
Logged = FALSE
my_username <- "test"
my_password <- "test"
ui1 <- function() {
tagList(
div(
id = "login",
wellPanel(
textInput("userName", "Username"),
passwordInput("passwd", "Password"),
br(),
actionButton("Login", "Log in")
)
),
tags$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)
似乎上面的代码不再起作用(感谢@ 5249203指出这一点)。
我已经尝试修复它,但是我没有设法使该do.call
函数正常工作dashboardBody
(如果有人知道一种方法,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。
看看您的想法(当然,像往常一样,解决方案只是需要扩展的模板)。
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)
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