simple shiny app with input text and output text

Question

I am trying to create the most basic shiny app. Consider this simple example

library(stringr)

input <- 'hello my friend'

output <- mytext %>% strsplit('')
> mytext %>% strsplit('')
[[1]]
 [1] "h" "e" "l" "l" "o" " " "m" "y" " " "f" "r" "i" "e" "n" "d"

All I need is a text box that asks for an input text form the user and then the program would show on another text box (say, just below the input box) the output of output.

I know how to create an input box (https://shiny.rstudio.com/reference/shiny/1.6.0/textInput.html) , but here I need to have a way to show the output of the text processing after the users enter their sentence and hit Enter.

Any ideas? Thanks!

Ronak Shah · Accepted Answer · 2021-03-16 03:34:24Z

2

Something like this?

library(shiny)

ui <- fluidPage(
  textInput('input', 'Enter input'), 
  verbatimTextOutput('output')
)

server <- function(input, output) {
  output$output <- renderText({
    req(input$input)
    strsplit(input$input, '')[[1]]
  })
}

shinyApp(ui, server)

edited Mar 16, 2021 at 3:34

answered Mar 16, 2021 at 3:28

Ronak Shah

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10 Comments

neilfws Over a year ago

verbatimTextOutput('output') might be another option if you want something that more resembles console output.

ℕʘʘḆḽḘ Over a year ago

amazing thanks! what is the purpose of the req(input$input) line?

Ronak Shah Over a year ago

@ℕʘʘḆḽḘ It runs strsplit(input$input, '')[[1]] line only when input is not null or not empty.

ℕʘʘḆḽḘ Over a year ago

strange I am getting The application failed to start.

Ronak Shah Over a year ago

What happens when you copy-paste the code in the answer into the console?

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