Applying reactivity concepts

Building Web Applications with Shiny in R

Ramnath Vaidyanathan

VP of Product Research

Reactivity 101

Reactives and observers

• Reactive sources are accessible through any input$x.
• Reactive conductors are good for slow or expensive calculations, and are placed between sources and endpoints.
• Reactive endpoints are accessible through any output$y, and are observers, primarily used for their side effects, and not directly to calculate things.

Stop, Delay, Trigger

• Stop with isolate()
• Delay with eventReactive()
• Trigger with observeEvent()

Let's practice!

Building Web Applications with Shiny in R