User notification plugin module — notify

During the evaluation cycle of each block, user notifications may be generated to inform in case of issues such as errors or warnings. These notifications are provided in a way that display can be controlled and adapted to specific needs. The default notify_user plugin simply displays notifications via shiny::showNotification(), with some ID management in order to be able to clear no longer relevant notifications via shiny::removeNotification().

Usage

notify_user(server = notify_user_server, ui = NULL)

notify_user_server(id, board, ...)

Arguments

server, ui: Server/UI for the plugin module
id: Namespace ID
board: Reactive values object
...: Extra arguments passed from parent scope

Value

A plugin container inheriting from notify_user is returned by notify_user(), while the UI component (e.g. notify_user_ui()) is expected to return shiny UI (i.e. shiny::tagList(); if available) and the server component (i.e. notify_user_server()) is expected to return a shiny::reactiveVal() or shiny::reactive() which evaluates to a list containing notifications per block and notification type (i.e. "message", "warning" or "error").