R Shiny - Hiding an Output When a Value Changes - r

Question

I Would like to make a form type Shiny app where the output is shown when a user clicks and action button, but the output is subsequently hidden if an input values changes.
Here is an example:
library(shiny)
library(shinyjs)
ui <- fluidPage(
radioButtons("myRadioButton", label = h4("Radio Input"),
choices = list("A" = 0,
"B" = 1,
"C" = 2),
selected = character(0)),
numericInput("myNumericInput", label = h4("Numeric Input"),
value = NA, min = 0, max = 50, step = 1),
actionButton("submit", "Submit"),
textOutput("myOutput")
)
server <- function(input, output, session){
score <- reactive({
scoreOut <- paste(input$myRadioButton, input$myNumericInput)
})
observeEvent(input$myRadioButton, {
hide("myOutput")
})
observeEvent(input$myNumericInput, {
hide("myOutput")
})
observeEvent(input$submit, {
show("myOutput")
output$myOutput <- renderText({
paste("This is your value:", score())
})
})
}
shinyApp(ui, server)
So in the above example the output displays after "Submit" is clicked. What I would like is if you go back and change say the radio or numeric input, the output disappears until "Submit" is clicked again.

Answer 1

You missed the useShinyjs() in the UI to load the JavaScript required to execute the hide function:
library(shiny)
library(shinyjs)
ui <- fluidPage(
# load required Java Script
useShinyjs(),
radioButtons("myRadioButton",
label = h4("Radio Input"),
choices = list(
"A" = 0,
"B" = 1,
"C" = 2
),
selected = character(0)
),
numericInput("myNumericInput",
label = h4("Numeric Input"),
value = NA, min = 0, max = 50, step = 1
),
actionButton("submit", "Submit"),
textOutput("myOutput")
)
server <- function(input, output, session) {
score <- reactive({
scoreOut <- paste(input$myRadioButton, input$myNumericInput)
})
observeEvent(input$myRadioButton, {
hide("myOutput")
})
observeEvent(input$myNumericInput, {
hide("myOutput")
})
observeEvent(input$submit, {
show("myOutput")
output$myOutput <- renderText({
paste("This is your value:", score())
})
})
}
shinyApp(ui, server)