How to show Spinning Wheel or Busy Icon while waiting in Shiny : <p>Hey i've just started working with R and Shiny.
Trying to make a dashboard which displays different charts.
As there is a lot of data to process, the plots or charts take some time to display after the action button is clicked i.e. "launch Campaign' 
Is there anyway i could show a spinning wheel or a loading icon  in the white blank space, while this delay takes place? <a href="https://i.stack.imgur.com/TRPJ4.jpg" rel="noreferrer">Dashboard with blank space on the right</a> </p>
