R: Implement render functions

createRenderFunction {shiny}

R Documentation

Implement render functions

Implement render functions

createRenderFunction(
  func,
  transform = function(value, session, name, ...) value,
  outputFunc = NULL,
  outputArgs = NULL
)

`func`	A function without parameters, that returns user data. If the returned value is a promise, then the render function will proceed in async mode.
`transform`	A function that takes four arguments: `value`, `session`, `name`, and `...` (for future-proofing). This function will be invoked each time a value is returned from `func`, and is responsible for changing the value into a JSON-ready value to be JSON-encoded and sent to the browser.
`outputFunc`	The UI function that is used (or most commonly used) with this render function. This can be used in R Markdown documents to create complete output widgets out of just the render function.
`outputArgs`	A list of arguments to pass to the `outputFunc`. Render functions should include `outputArgs = list()` in their own parameter list, and pass through the value as this argument, to allow app authors to customize outputs. (Currently, this is only supported for dynamically generated UIs, such as those created by Shiny code snippets embedded in R Markdown documents).

An annotated render function, ready to be assigned to an output slot.

[Package shiny version 1.5.0 Index]