ReactiveValues trigger different observeEvents not working - r

Question

Problem: I have the following app. Essentially, I want to press the button to load the data. After the first time I load the data via button press I want to get ask if I want to save my changes. If yes, confirmation that changes were successfully saved, else show some other data (other data not included).
Approach I tried to solve it with observeEvent expressions which are triggered via reactiveValues. However, as you will observe when running the script below, this does not work out as expected.
Question: Any idea on what is wrong?
library(shiny)
library(shinyWidgets)
library(rhandsontable)
shinyApp(
ui = fluidPage(
actionButton("show", "Show data", width = "100%"),
rHandsontableOutput("data_table")
),
server = function(input, output) {
rv <- reactiveValues(
# Triggers
pressed_first_time = 0,
confirm_module = TRUE,
save_module = TRUE,
table_change = TRUE
)
observeEvent(input$show, ignoreInit = TRUE, {
if (rv$pressed_first_time == 0){
rv$pressed_first_time <- isolate(rv$pressed_first_time + 1)
rv$table_change <- isolate(!rv$table_change)
cat("pressed_first time")
} else {
rv$pressed_first_time <- isolate(rv$pressed_first_time + 1)
rv$confirm_module <- isolate(!rv$confirm_module)
}
})
observeEvent(rv$confirm_module, ignoreInit = TRUE,{
confirmSweetAlert(
session = session,
inputId = session$ns("show_confirmation"),
title = "Be careful, your changes might be lost",
text = "Do you want to save your changes?",
type = "question",
btn_labels = c("Cancel", "Save"),
btn_colors = NULL,
closeOnClickOutside = FALSE,
showCloseButton = FALSE,
html = FALSE
)
cat("confirmation module")
rv$save_module <- isolate(!rv$save_module)
})
observeEvent(rv$save_module, ignoreInit = TRUE, {
if (isTRUE(input$show_confirmation)) {
sendSweetAlert(
session = session,
title = "Saved",
text = "Updated data has been successfully saved",
type = "success"
)
rv$table_change <- isolate(!rv$table_change)
cat("saving module")
} else {
return()
}
})
data_to_modify <- eventReactive(rv$table_change, ignoreInit = TRUE, {
mtcars
})
handson_df <- eventReactive(rv$table_change, ignoreInit = TRUE, {
cat("create handsons")
req(data_to_modify())
rhandsontable(data_to_modify())
})
output$data_table <- renderRHandsontable({
cat("plot module")
req(handson_df())
htmlwidgets::onRender(handson_df(),change_hook)
})
}
)

Answer 1

I think its just that you need session inside the server, as in:
server = function(input, output, session) {...

Answer 2

Actually, I found out the problem. The link from data_to_modify to handson_df was missing. In the below solution I put them together but in principle adding another reactiveValue triggering handson_df from data_to_modify will also work
library(shiny)
library(rhandsontable)
shinyApp(
ui = fluidPage(
actionButton("show", "Show data", width = "100%"),
rHandsontableOutput("data_table")
),
server = function(input, output) {
rv <- reactiveValues(
# Triggers
pressed_first_time = 0,
confirm_module = TRUE,
save_module = TRUE,
table_change = TRUE
)
observeEvent(input$show, ignoreInit = TRUE, {
if (rv$pressed_first_time == 0){
rv$pressed_first_time <- 1
rv$table_change <- isolate(!rv$table_change)
cat("pressed_first time")
} else {
rv$pressed_first_time <- 1
rv$confirm_module <- isolate(!rv$confirm_module)
}
})
observeEvent(rv$confirm_module, ignoreInit = TRUE,{
confirmSweetAlert(
session = session,
inputId = session$ns("show_confirmation"),
title = "Be careful, your changes might be lost",
text = "Do you want to save your changes?",
type = "question",
btn_labels = c("Cancel", "Save"),
btn_colors = NULL,
closeOnClickOutside = FALSE,
showCloseButton = FALSE,
html = FALSE
)
})
observeEvent(input$show_confirmation, ignoreInit = TRUE, {
if (isTRUE(input$show_confirmation)) {
sendSweetAlert(
session = session,
title = "Saved",
text = "Updated data has been successfully saved",
type = "success"
)
rv$table_change <- isolate(!rv$table_change)
cat("saving module")
} else {
return()
}
})
data_to_modify <- eventReactive(rv$table_change, ignoreInit = TRUE, {
rhandsontable(mtcars)
})
# handson_df <- eventReactive(rv$table_change, ignoreInit = TRUE, {
# cat("create handsons")
# req(data_to_modify())
# rhandsontable(data_to_modify())
# })
output$data_table <- renderRHandsontable({
cat("plot module")
req(data_to_modify())
data_to_modify()
# htmlwidgets::onRender(handson_df(),change_hook)
})
}
)