Implement render functions
createRenderFunction(func, transform = function(value, session, name,
...) value, outputFunc = NULL, outputArgs = NULL)A function without parameters, that returns user data. If the returned value is a promise, then the render function will proceed in async mode.
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.
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.
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.