r - shiny add Progress bar with source() function -


at start of shiny application, run source function load , process data.

everything ok, when user start application, there loading time of 10 seconds. add progress bar.

i saw tutorials, integrated observe or reactive function, not case.

shinyserver(function(input, output,session) {   source("/srv/shiny-server/data_base/import.r")     })

how add progress bar ?

maybe link helps: https://github.com/daattali/shiny-server/blob/master/loading-screen/app.r

basically should add code outside reactive content: 

 appcss <- " #loading-content {   position: absolute;   background: #000000;   opacity: 0.9;   z-index: 100;   left: 0;   right: 0;   height: 100%;   text-align: center;   color: #ffffff; } "

this ui side:

useshinyjs(), inlinecss(appcss),  # loading message div(   id = "loading-content",   h2("loading...") ),

and server side (will hide "loading" message after content has been loaded:

 hide(id = "loading-content", anim = true, animtype = "fade")

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