registerCallback: Register a DOM Callback.
In pmur002/DOM: Interact with Web Browser DOM

Description Usage Arguments Value Author(s) See Also Examples

Register an R function as a callback. This allows callbacks to not pollute the global environment.

1	registerCallback(f, name = deparse(substitute(f)))

`f`	A function that will be called following a DOM request such as `appendChild`. The function will be called with a single value, which is the result of the request.
`name`	The name by which the function will be known. This is the name that must be used in the DOM request.

Called for its side-effect of registering the callback function.

Paul Murrell

htmlPage, appendChild

cbgen <- function() {
    count <- 0
    function(value) {
        count <<- count + 1
        cat(count, "\n")
    }
}
cb <- cbgen()
registerCallback(cb)
headlessPage <- htmlPage(client=phantomClient)
appendChild(headlessPage, htmlNode("<p>test</p>"), callback=cb)
appendChild(headlessPage, htmlNode("<p>test</p>"), callback=cb)
closePage(headlessPage)