Modals are a UI element from Bootstrap and are pop-up messages that can tell your user more about what the application is doing. They can be useful to give a user warnings, or to allow the user to request more information about an output if they wish to know more. You can write a modal very simply, using two functions in the server.R file. The modalDialog function produces the modal, and the showModal function shows it. You can use them together just like this:
showModal(modalDialog( title = "Warning", "This is a warning"))
This will give us a simple dialog with a title and a main section:
But we can do more interesting things than ...
