R Programming By Example

The building blocks for reactivity in Shiny

The building blocks of reactivity in Shiny are built around three types of functions: input, output, and rendering functions. Input functions most of the time end with the Input string (not always) and I will refer to them as Input() functions. Output functions always end with the Output string and I will refer to them as Output() functions. Finally, rendering functions begin with the render string and similarly I will refer to them as render*() functions.

Input*() functions are used within the ui object and they generate reactive values, which are values received from an interaction through a web browser, and are passed through the input parameter in the server function. The render*() functions ...