Reading in a file in R Shiny

Question

So I am building an app in R shiny that requires the user to upload a .csv file. Once read in by R shiny, I am unsure how to actually manipulate that object to use. The general code syntax is the following:

The UI file:

#ui.R
# Define UI for random distribution application 
shinyUI(fluidPage(

  # Application title
  titlePanel("ORR Simulator"),

  # Sidebar with controls to select the random distribution type
  # and number of observations to generate. Note the use of the
  # br() element to introduce extra vertical spacing
  sidebarLayout(
    sidebarPanel(
          fileInput('file1', 'Select the XXX.csv file',
                accept=c('text/csv','text/comma-separated-values,text/plain','.csv')),
      tags$hr(),
          fileInput('file2', 'Select the YYY.csv file',
                accept=c('text/csv','text/comma-separated-values,text/plain','.csv')),
      tags$hr(),
     numericInput("S", "Number of simulations to run:", 100),

       mainPanel(
plotOutput("plot")
    )
  )
))

The server file:

#server.R
library(shiny)

shinyServer(function(input, output) {

text1 <- renderText({input$file1})
text2 <- renderText({input$file2})

file1 = read.csv(text1)
file2 = read.csv(text2)

output$plot <- renderPlot({

plot(file1[,1],file2[,2])

})


})

And so I would have expected text1 and text2 to hold strings containing the file path to where the files are but that does not seem to be the case. Ultimatley I just want to be able to read in two data sets and from there be able to do analysis to output based on those two data sets.

Of course using renderText might be the wrong idea as well so any suggestions on how to do this better is greatly appreciated.

Reading in a file in R Shiny

1 Answers