isolate the variable

Hi,
You will fin hereafter an extract of my app.

I use isolate() for input$prio_rows_selected but I have to reload my application to initiate the value.
I would like to know if it is possible to reset my variable without exiting my application?
Thanks in advance to your reply!
My code is based on GitHub - jienagu/DT-Editor: This is a DT Editor Shiny app

val.ecr<-reactive({
            selected_row_ecr<-0
            selected_row_ecr=isolate(input$prio_rows_selected)
            old_row_ecr=tab.ecr.prio[selected_row_ecr]
            tab.val.ecr<-old_row_ecr
            as.data.frame(tab.val.ecr)
            tab.val.ecr
            #ligne<-saveRDS(tab.val.ecr,"ligne.rds")
  })
    
  output$card<- renderText({
    val<-val.ecr()
    prettyNum(paste0(val[1,1],big.mark=","))
  })

I don't know if my issue it's clear!
Have you an idea?
Thanks!

Hi,

When you want to use an isolate you may better trigger the evaluation based on a reactive button

I followed your advise and I added enventReactive so the output$card is updated at each button click

val.ecr<-eventReactive(input$prio_rows_selected,{
           
            selected_row_ecr=input$prio_rows_selected
            old_row_ecr=tab.ecr.prio[selected_row_ecr]
            tab.val.ecr<-old_row_ecr
            as.data.frame(tab.val.ecr)
            tab.val.ecr
            })
  
  output$card<- renderText({
    val<-val.ecr()
    prettyNum(paste0(val[1,1]))
  }) 

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Is there any reason to put it into an isolate() ?
I mean, yes when it is in isolate it doesn't react anymore to changes in the input$rows_selected. Probably it doesn't react at all as the rows_selected isn't initialised in the beginning.

Have you tried without using isolate?
When you want to use an isolate you may better trigger the evaluation based on a reactive button, so it's updated whenever you hit the button, but not when changing the values before.