Shiny : How to modify reactive object

Question

I have a reactive object that i want to modify when the user click on the GO button. I tried this code and Per gives a great result. Now I want to do more than

Answer 1

In order to store and update reactive objects, you can use reactiveVal or reactiveValues.

I created a simple example on how this works with your goal in mind:

server <- shinyServer(function(input, output) {

  RA_s <- reactiveVal()
  RA_s(1) # intiialize the reactiveVal, place your csv read here.


  # an observer to update the reactiveVal RA_s
  observeEvent(input$go, {
    # read the current value
   current_value <- RA_s()

   # update the value
   new_value <- current_value +1

   # write the new value to the reactive value
   RA_s(new_value)

   # print to console, just to check if it updated.
   print(paste0("Succesfully updated, new value: ",RA_s()))
  })

})


ui <- shinyUI(
  fluidPage(
    actionButton("go","GO!")     
  )
)
shinyApp(ui,server)

Hope this helps!