我希望我的Shiny应用允许用户指定文件夹的路径(本地)和显示所选路径。以下代码有效,但我无法弄清楚如何隐藏"字符(0)"在verbatimTextOutput中,直到选择文件夹。我尝试了条件面板(请参阅我的代码中的注释),但无法在此处找出要用作条件的内容(因为shinyDirButton不是标准的操作按钮......)。谢谢!
library(shiny)
library(shinyFiles)
# Define UI for application that draws a histogram
ui <- fluidPage(
# Application title
mainPanel(
shinyDirButton("dir", "Input directory", "Upload"),
#conditionalPanel(
#condition = "???",
verbatimTextOutput('dir')
#)
)
)
server <- function(input, output) {
shinyDirChoose(input, 'dir', roots = c(home = '~'), filetypes = c('', 'txt','bigWig',"tsv","csv","bw"))
dir <- reactive(input$dir)
output$dir <- renderPrint({parseDirPath(c(home = '~'), dir())})
observeEvent(
ignoreNULL = TRUE,
eventExpr = {
input$dir
},
handlerExpr = {
home <- normalizePath("~")
datapath <<- file.path(home, paste(unlist(dir()$path[-1]), collapse = .Platform$file.sep))
}
)
}
# Run the application
shinyApp(ui = ui, server = server)
我能找到的最接近的问题是这个,但它并没有解决我的问题:R conditionalPanel reacts to output
答案 0 :(得分:2)
在服务器功能中,使用renderText
代替renderPrint
:
library(shiny)
library(shinyFiles)
# Define UI for application that draws a histogram
ui <- fluidPage( # Application title
mainPanel(
shinyDirButton("dir", "Input directory", "Upload"),
verbatimTextOutput("dir", placeholder = TRUE) # added a placeholder
))
server <- function(input, output) {
shinyDirChoose(
input,
'dir',
roots = c(home = '~'),
filetypes = c('', 'txt', 'bigWig', "tsv", "csv", "bw")
)
dir <- reactive(input$dir)
output$dir <- renderText({ # use renderText instead of renderPrint
parseDirPath(c(home = '~'), dir())
})
observeEvent(ignoreNULL = TRUE,
eventExpr = {
input$dir
},
handlerExpr = {
home <- normalizePath("~")
datapath <<-
file.path(home, paste(unlist(dir()$path[-1]), collapse = .Platform$file.sep))
})
}
# Run the application
shinyApp(ui = ui, server = server)