R Programming By Example

Introducing the Shiny application architecture and reactivity

In its simplest form, a Shiny application requires a server and a user interface (UI). These components form the basic architecture behind all Shiny applications. The ui object controls the layout and appearance of your application, and the server function contains the logic needed by the application. If you know how web applications work, you can think of them as the frontend and the backend, respectively. The shinyApp() function creates and launches a Shiny application from an explicit UI/server pair. It will compile R code into web-friendly languages HTML, JavaScript, and CSS.

Below we have the simplest possible Shiny application, which has an empty server and a UI with a basic ...