I want to create an app where User A uploads a file to server and User B can download it to a local folder.
I am first implementing the actions of uploading the file, and then immediately store that file to my own specified folder (since I am the sole User here). This is the code:
library(shiny)
ui <- fluidPage(
fileInput('file1', 'Choose csv File',
accept=c('text/csv'))
)
server <- function(input , output){
rootDir <- 'C:/RShiny/Dir'
inFile <- reactive({input$file1})
file.copy(inFile()$datapath,
file.path(rootDir, inFile()$name, fsep = .Platform$file.sep))
}
shinyApp(ui = ui , server = server)
However, I keep receiving this error message:
Warning: Error in .getReactiveEnvironment()$currentContext: Operation not allowed without an active reactive context. (You tried to do something that can only be done from inside a reactive expression or observer.)
53: stop
52: .getReactiveEnvironment()$currentContext
51: getCurrentContext
50: .dependents$register
49: inFile
47: server [C:\RShiny\.../app.R#12]
Error in .getReactiveEnvironment()$currentContext() :
Operation not allowed without an active reactive context. (You tried to do something that can only be done from inside a reactive expression or observer.)
And the app just closes right away. Not sure what it means and how to fix it. If someone could help explaining?
Thanks,
Please try the below:
library(shiny)
ui <- fluidPage(
fileInput('file1', 'Choose csv File',
accept=c('text/csv'))
)
server <- function(input , output){
rootDir <- 'C:/RShiny/Dir'
inFile <- reactive({input$file1})
observe({
file.copy(inFile()$datapath,
file.path(rootDir, inFile()$name, fsep = .Platform$file.sep))
})
}
shinyApp(ui = ui , server = server)
You need to put the file.copy() code in an observe ("a reactive expression or observer").
Related
This code should produce a pop up that allows Directory Selection for a Shiny App.
However, when I run the code the button appears but is unresponsive in both the R-studio viewer and when run in a web-browser.
Does the code work for you? Is there anything that I am not doing right?
library(shiny)
library(shinyFiles)
ui <- fluidPage(
shinyDirButton('folder', 'Select a folder', 'Please select a folder', FALSE)
)
server <- function(input, output){
volumes = getVolumes() # this makes the directory at the base of your computer.
observe({
shinyDirChoose(input, 'folder', roots=volumes, filetypes=c('', 'txt'))
print(input$folder)
})
}
shinyApp(ui=ui, server=server)
Thank you in advance
I found a different function that works, choose.dir().
library(shiny)
library(shinyFiles)
ui <- fluidPage(
actionButton("dir", 'select a folder'),
textOutput("wd") #display working directory
)
server <- function(input, output) {
observeEvent(input$dir, {
setwd(choose.dir("c:/")) #selecting a directory
output$wd <- renderText(getwd())})
}
shinyApp(ui = ui, server = server)
I'm trying to build a Shiny App that monitors my running containers on a host machine, and here is what I have tried so far. Question is how can I display the outputs, in this case (docker ps -a) contents in the mainPanel? I'm new to Rshiny, so any help will be much appreciated!
library(shiny)
library(ssh)
ui <- fluidPage(
titlePanel("Dashboard"),
sidebarLayout(
sidebarPanel(
actionButton("bttn", "Click")
),
mainPanel(
h1("Running containers"),
textOutput("dispContainers")
)
)
)
# Define server logic
server <- function(input, output, session) {
session <- ssh_connect("jeroen#dev.opencpu.or")
observeEvent(input$bttn, {
ssh_exec_wait(session, command = 'docker ps -a')
})
}
# Run the application
shinyApp(ui, server)
You can use the other ssh_exec_internal instead to collect the output of your docker command. Something like:
server <- function(input, output, session) {
session <- ssh_connect("jeroen#dev.opencpu.or")
text_output <- reactiveVal("")
observeEvent(input$bttn, {
response <- ssh_exec_internal(session, command = 'docker ps -a')
text_output(rawToChar(response$stdout))
})
output$dispContainers <- renderText(text_output())
}
You might also want to switch textOutput to verbatimTextOutput to get the text as you'd see it in a terminal.
Here is my code for a simple test app:
library(shiny)
library(shinydashboard)
library(googlesheets4)
library(googledrive)
library(DT)
drive_auth(email = "xxxx")
shinyws1<-gs4_create("WS1")
#table<-read_sheet("xxx")
# Define UI for application
ui <- fluidPage(
# Application title
titlePanel("Test App"),
# Sidebar with a slider input for number of bins
sidebarLayout(
sidebarPanel(
numericInput("bins",
"Number of friends:",
min = 1,
max = 100,
value = 50),
actionButton("submit","Submit",class="btn-success")
),
# Show a plot of the generated distribution
mainPanel(
#blank so far
)
)
)
# Define server logic required to draw a histogram
server <- function(input, output) {
#results<-reactive(input$bins)
observeEvent(input$submit,{
shinyws1 %>% sheet_append(as.data.frame(input$bins))
})
}
# Run the application
shinyApp(ui = ui, server = server)
It works okay in my local server. But deployment fails.
Here is the error message generated after deployment in Shinyio server:
Error in value[[3L]](cond) : Can't get Google credentials.
Are you running googledrive in a non-interactive session? Consider:
* `drive_deauth()` to prevent the attempt to get credentials.
* Call `drive_auth()` directly with all necessary specifics.
* Read more in: https://gargle.r-lib.org/articles/non-interactive-auth.html
Calls: local ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted
Does anyone know how to fix it? I've tried every workaround I found online, but it didn't work.
I am new to R and I am actually developing a page where a directory (string characters like "xx/xx") is given in the server and I want to take back this directory to include it in the source of my ui app.
UI:
library(shiny)
file<-textOutput("paramfile")
source(file(file), local = TRUE, encoding = 'UTF-8')
SERVER :
filedir<-renderText({
"entries/5429_param.R"
})
output$paramfile<-renderText({
filedir()
})
I then have an error :
"Warning in file(filename, "r", encoding = encoding) : cannot open
file '< div id="paramfile" class="shiny-text-output">< /div>':
Invalid argument
Error in file(filename, "r", encoding = encoding) :
cannot open the connection"
Do you know how can I remove those tags or if there is another function that can allow me to take a string in the server and to include it into a source.
Here is a basic example of a ShinyApp:
# Example of UI with fluidPage
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
textInput("dir", label = "Enter a directory")
),
mainPanel(
verbatimTextOutput("dirPrint"),
verbatimTextOutput("lsFiles")
)
)
)
# Server logic
server <- function(input, output) {
output$dirPrint <- renderPrint({
print(input$dir)
})
output$lsFiles <- renderPrint({
fls <- list.files(input$dir)
print(fls)
})
}
# Complete app with UI and server components
shinyApp(ui, server)
If you enter the path of a directory in the textinput, the second renderPrint function is showing all files, that are found at that path.
I would suggest you go over the Shiny-Tutorials, as there seem to be some syntax-problems in your code and I am not sure what exactly you want to achieve.
I am trying to create a simple shiny app using shineFiles that allows users to select a file for download from a directory on the web.
library(shiny)
library(shinyFiles)
ui <- fluidPage(
shinyFilesButton('files', label='File select', title='Please select a file', multiple=FALSE)
)
server <- function(input, output) {
shinyFileChoose(input, 'files',
roots = (root = c('http://mirrors.vbi.vt.edu/mirrors/ftp.ncbi.nih.gov/blast/db/')),
filetypes=c('', 'txt' , '.gz' , '.md5'))
}
shinyApp(ui = ui , server = server)
However, I am getting the below error:
Listening on http://127.0.0.1:6772
Warning: Error in fileGet: Roots must be a named vector or a function returning one
Stack trace (innermost first):
60: fileGet
59: do.call
58: observerFunc
1: runApp
ERROR: [on_request_read] connection reset by peer
I need help in defining the directory as: http://mirrors.vbi.vt.edu/mirrors/ftp.ncbi.nih.gov/blast/db/