Shiny reactive primitives

These functions are re-exported from shiny for convenience, so you can use them in irid apps without loading shiny explicitly.

Value

The return values are those of the underlying shiny functions:

• reactiveVal() returns a function that reads the current value when called with no argument and sets it when called with one value.

• reactive() returns a reactive expression (a function of class reactiveExpr/reactive) that yields the cached expression value when called.

• observe() and observeEvent() return an observer reference object (class Observer) invisibly; they are called for their side effects.

• isolate() returns the value of expr, evaluated without taking a reactive dependency.

• tags is a named list of functions that construct HTML tag objects, and tagList() returns a list of tags (class shiny.tag.list).

Details

• reactiveVal(): Create a reactive value

• reactive(): Create a reactive expression

• observe(): Create an observer

• observeEvent(): Create an event-driven observer

• isolate(): Run an expression without reactive dependencies

• tags: HTML tag builder

• tagList(): Combine tags into a list

See the shiny documentation for full details.