Η如何获取使用闪亮文件输入上传的文件的文件名？

Question

我有下面闪亮的应用程序，用户在其中登陆Upload data 面板。如果用户没有上传Upload data 选项卡中需要的两个文件，我希望用户不能移动到其他 2 个tabpanels。这里的问题是，我希望仅当 csv 名称是特定的时才激活两个选项卡。例如，在第一个或第二个fileInput() 中导入的 csv 应命名为 csvone，而在第一个或第二个 fileInput() 中导入的 csv 应命名为 csvtwo。但是无论哪个是第一个，都应该上传两个文件。

library(shiny)
library(shinyjs)

jscode <- "
shinyjs.disableTab = function(name) {
  var tab = $('.nav li a[data-value=' + name + ']');
  tab.bind('click.tab', function(e) {
    e.preventDefault();
    return false;
  });
  tab.addClass('disabled');
}

shinyjs.enableTab = function(name) {
  var tab = $('.nav li a[data-value=' + name + ']');
  tab.unbind('click.tab');
  tab.removeClass('disabled');
}
"

css <- "
.nav li a.disabled {
  background-color: #aaa !important;
  color: #333 !important;
  cursor: not-allowed !important;
  border-color: #aaa !important;
}"

#ui.r
ui <- fluidPage(
  useShinyjs(),
  extendShinyjs(text = jscode, functions = c("disableTab","enableTab")),
  inlineCSS(css),
  # App title ----
  titlePanel("Tabsets"),
  
  # Sidebar layout with input and output definitions ----
  sidebarLayout(
    
    # Sidebar panel for inputs ----
    sidebarPanel(
    ),
    
    # Main panel for displaying outputs ----
    mainPanel(
      tabsetPanel( id="tabset",
                   tabPanel("Upload data", value="tab0",
                            fileInput("file1", "Choose CSV File",
                                      multiple = TRUE,
                                      accept = c("text/csv",
                                                 "text/comma-separated-values,text/plain",
                                                 ".csv")),
                            fileInput("file2", "Choose CSV File",
                                      multiple = TRUE,
                                      accept = c("text/csv",
                                                 "text/comma-separated-values,text/plain",
                                                 ".csv"))),
                   tabPanel("Resource Allocation", value="tab1"),
                   tabPanel("Time Series", value="tab2")
      )
    )
  )
)
#server.r

server = function(input, output) {
  print("test")
  js$disableTab("tab1")
  js$disableTab("tab2")
 
 observe({
  req(input$file1, input$file2)
  js$enableTab("tab1")
  js$enableTab("tab2")
})
}

shinyApp(ui, server)

Answer 1

只需像这样将启用命令包装在 if/else 语句中

顺便说一句：您（应该）问的问题本质上是“我怎样才能获得带有闪亮fileInput 的上传文件的文件名？”

library(shiny)
library(shinyjs)

jscode <- "
shinyjs.disableTab = function(name) {
  var tab = $('.nav li a[data-value=' + name + ']');
  tab.bind('click.tab', function(e) {
    e.preventDefault();
    return false;
  });
  tab.addClass('disabled');
}

shinyjs.enableTab = function(name) {
  var tab = $('.nav li a[data-value=' + name + ']');
  tab.unbind('click.tab');
  tab.removeClass('disabled');
}
"

css <- "
.nav li a.disabled {
  background-color: #aaa !important;
  color: #333 !important;
  cursor: not-allowed !important;
  border-color: #aaa !important;
}"

#ui.r
ui <- fluidPage(
  useShinyjs(),
  extendShinyjs(text = jscode, functions = c("disableTab","enableTab")),
  inlineCSS(css),
  # App title ----
  titlePanel("Tabsets"),
  
  # Sidebar layout with input and output definitions ----
  sidebarLayout(
    
    # Sidebar panel for inputs ----
    sidebarPanel(
    ),
    
    # Main panel for displaying outputs ----
    mainPanel(
      tabsetPanel( id="tabset",
                   tabPanel("Upload data", value="tab0",
                            fileInput("file1", "Choose CSV File",
                                      multiple = TRUE,
                                      accept = c("text/csv",
                                                 "text/comma-separated-values,text/plain",
                                                 ".csv")),
                            fileInput("file2", "Choose CSV File",
                                      multiple = TRUE,
                                      accept = c("text/csv",
                                                 "text/comma-separated-values,text/plain",
                                                 ".csv"))),
                   tabPanel("Resource Allocation", value="tab1"),
                   tabPanel("Time Series", value="tab2")
      )
    )
  )
)
#server.r

server = function(input, output) {
  js$disableTab("tab1")
  js$disableTab("tab2")
 
 observe({
  req(input$file1, input$file2)
  if(input$file1$name == "csvone.csv" && input$file2$name == "csvtwo.csv"){
    js$enableTab("tab1")
    js$enableTab("tab2")
  }
})
}

shinyApp(ui, server)