If your Shiny app contains computations that take a long time to complete, a progress bar can improve the user experience by communicating how far along the computation is, and how much is left. Progress bars were added in Shiny 0.10.2. In Shiny 0.14, we’ve changed them to use the notifications system, which gives them a different look.
Important note: If you were already using progress bars and had customized them with your own CSS, you can add the
style = "old"argument to your
Progress$new()). This will result in the same appearance as before. You can also call
shinyOptions(progress.style = "old")in your app’s server function to make all progress indicators use the old styling.
It looks like they’ve made some good progress with Shiny.