How to make a shiny app survive...

[Lukasz Kiljanek]

Once my apps shows results, users can review for minutes ...

I don't want the app to die (reload - disconnected message ) when user is still scrolling website on mobile( with finger) and with mouse, mouse wheel... Etc?

There has to be an easy JS way?

I am a newbie to JS.

Anyone please?
Best
Luke

[Aaron Hoffer]

The shinyJS package allows you to track events using onEvent(). There is a jquery.mousewheel plugin that allows you to track "mousewheel" events. Here's a minimum example to implement. This won't work for mobile, but you may be able to use touchmove or scroll for that.

library(shiny)

library(shinyjs)

shinyApp(

  ui = fluidPage(

    tags$head(tags$script(src="https://cdnjs.cloudflare.com/ajax/libs/jquery-mousewheel/3.1.13/jquery.mousewheel.min.js")),

    useShinyjs(),

    div(id = "foo", style = "height:800px;",

        textOutput("val_a"))

  ),

  server = function(input, output) {

    a <<- 1

    shinyjs::onevent("mousewheel", "foo", myFunc())

    myFunc = function() {

      output$val_a = renderText({a <<- a + 1; a})

    }

  }

)

[Joe Cheng]

The disconnection after idling is a feature that you can control through the ShinyApps.io dashboard. Log into shinyapps.io, click the app name, and go to Settings | Advanced | Connection Timeout. You can set this to a very large number if you want.

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