R从服务器端目录中选择文件

Question

I have a folder called logs filled with different .csv files, formatted as telemetryLog-2017.21.08.54.11.csv (with varying dates and times at end).

For example, the above file could be stored like this: file <- read.csv("logs/telemetryLog-1969.2017.21.08.54.11.csv", header=TRUE)

The log files would be uploaded (in the logs folder, to shinyapps.io ) along with the ui.R and server.R files. I would like to be able to obtain a list of the filenames in order to be able to select a file to display as data in a plot via selectInput (or any other way to list the files). The amount of files in the folder will not be an excessive amount; most likely it will be limited to around 50.

I have read the documentation for shinyFiles and to be completely honest I do not fully understand how the commands such as fileGetter or dirGetter work. Any help would be appreciated.

Answer 1

Instead of having people browse the file system of your server, you could also use list.files and specify the right directory there:

library(shiny)
ui <-   fluidPage(
selectInput('selectfile','Select File',choice = list.files('log/')),
textOutput('fileselected')
)

server <- function(input,output)
{
  output$fileselected <- renderText({
    paste0('You have selected: ', input$selectfile)
  })
}

shinyApp(ui,server)

Hope this helps!