CODEWITHSUNDEEP
rshinyreactive-programming
Thilaga raghavan
Thilaga raghavan

Reputation: 101

How to store an old reactive input in R shiny after removing it

I have the following r shiny application. We first import the library

 library(shiny)

Now we generate the UI

 ui <- fluidPage(
 downloadButton("dl", "Download"),
 textInput("text","word inpput"),
 mainPanel(
 tableOutput("text1")
                      ))

Next we generate the server

  server <- function(input, output) {

    output$text1 <- renderTable({

      df1<-iris
      df1$text <- input$text
      return(df1)
      })
            }

Finally run the app

    shinyApp(ui, server)

We can now add a text to the textbox to dd to the column text in the dataframe output. However, if i remove the word, the dataframe output reverts to its original state owing to reactivity. Is there a way that the change in output can be made permanent so that even if the textinput box value is replaced, the old value reflects along with the new value

Upvotes: 1

Views: 192

Answers (1)

Eli Berkow
Eli Berkow

Reputation: 2725

Assuming I understand correctly, please test the below and let me know if it solves your problem or what still needs to be achieved:

server <- function(input, output) {

    values <- reactiveValues(df1 = iris)

    observeEvent(req(input$text != ""), {
        values$df1[, paste0("text", ncol(values$df1)-ncol(iris))] <- input$text
    })

    output$text1 <- renderTable({
        return(values$df1)
    })
}

Upvotes: 1

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