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R/add_ui.R
In teachingApps: Apps for Teaching Statistics, R Programming, and Shiny App Development
Defines functions
add_ui
Documented in
add_ui
#' Add the UI of one app within the UI of another app
#'
#' @description Sources a \code{ui.R} file before parsing and evaluating its contents in a specified environment
#'
#' @param app Name of the app from which the content of the \code{ui.R} will be pulled
#' @param path Path to a directory containing the app from which the content of the \code{ui.R} will be pulled
#'
#' @importFrom shiny addResourcePath
#'
#' @details Currently, this function can be used to insert an \code{server} into
#' a \code{navbarPage} app. The types of apps that can be inserted are:
#' \itemize{
#' \item{\code{fluidPage}}{}
#' \item{\code{bootstrapPage}}{}
#' \item{\code{pageWithSidebar}}{}
#' \item{\code{basicPage}}{}
#' \item{\code{fixedPage}}{}
#' }
#'
#' A \code{server} can be added as an entire \code{tabPanel} or as a row within
#' within a \code{tabPanel} portion of a shiny app.
#'
#' May be used with apps stored in packages other than teachingApps.
#' However, apps are assumed be stored in the \code{apps/} directory located
#' at top level of the package.
#'
#' @seealso \code{\link{add_server}} \code{\link{add_rmd}}
#' @return A list of length 2
#' \item{head}{A sub list containing the HTML content within the \code{<head>} tag}
#' \item{body}{A sub list containing the HTML content within the \code{<body>} tag}
#'
#'
#' @examples \dontrun{
#'
#' ## ui.R from app: 'maximum_likelihood'
#'
#' ui_ml <- system.file('apps',
#' 'maximum_likelihood',
#' 'server.R',
#' package = 'teachingApps')
#' browseURL(ui_ml)
#'
#' ## ui.R from app: 'distribution_weibull'
#'
#' ui_dw <- system.file('apps',
#' 'distribution_weibull',
#' 'server.R',
#' package = 'teachingApps')
#' browseURL(ui_dw)
#'
#' }
#' @export
add_ui <- function(app, path) {
no_app <- missing(app) || is.null(app) || is.na(app)
no_path <- missing(path) || is.null(path) || is.na(path)
if( no_app && no_path) stop('Either an app or a path must be specified')
if(!no_app && !no_path) stop('Only one app or path should be specified')
if(no_path) {
file <- system.file('apps', app, 'ui.R', package = 'teachingApps')
} else {
shiny::addResourcePath(basename(path), path)
file <- file.path(path, 'ui.R')
}
ui <- source(file = file)
return(ui[[1]])
}
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teachingApps documentation built on July 1, 2020, 5:58 p.m.
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Defines functions add_ui
Documented in add_ui
#' Add the UI of one app within the UI of another app
#'
#' @description Sources a \code{ui.R} file before parsing and evaluating its contents in a specified environment
#'
#' @param app Name of the app from which the content of the \code{ui.R} will be pulled
#' @param path Path to a directory containing the app from which the content of the \code{ui.R} will be pulled
#'
#' @importFrom shiny addResourcePath
#'
#' @details Currently, this function can be used to insert an \code{server} into
#' a \code{navbarPage} app. The types of apps that can be inserted are:
#' \itemize{
#' \item{\code{fluidPage}}{}
#' \item{\code{bootstrapPage}}{}
#' \item{\code{pageWithSidebar}}{}
#' \item{\code{basicPage}}{}
#' \item{\code{fixedPage}}{}
#' }
#'
#' A \code{server} can be added as an entire \code{tabPanel} or as a row within
#' within a \code{tabPanel} portion of a shiny app.
#'
#' May be used with apps stored in packages other than teachingApps.
#' However, apps are assumed be stored in the \code{apps/} directory located
#' at top level of the package.
#'
#' @seealso \code{\link{add_server}} \code{\link{add_rmd}}
#' @return A list of length 2
#' \item{head}{A sub list containing the HTML content within the \code{<head>} tag}
#' \item{body}{A sub list containing the HTML content within the \code{<body>} tag}
#'
#'
#' @examples \dontrun{
#'
#' ## ui.R from app: 'maximum_likelihood'
#'
#' ui_ml <- system.file('apps',
#' 'maximum_likelihood',
#' 'server.R',
#' package = 'teachingApps')
#' browseURL(ui_ml)
#'
#' ## ui.R from app: 'distribution_weibull'
#'
#' ui_dw <- system.file('apps',
#' 'distribution_weibull',
#' 'server.R',
#' package = 'teachingApps')
#' browseURL(ui_dw)
#'
#' }
#' @export
add_ui <- function(app, path) {
no_app <- missing(app) || is.null(app) || is.na(app)
no_path <- missing(path) || is.null(path) || is.na(path)
if( no_app && no_path) stop('Either an app or a path must be specified')
if(!no_app && !no_path) stop('Only one app or path should be specified')
if(no_path) {
file <- system.file('apps', app, 'ui.R', package = 'teachingApps')
} else {
shiny::addResourcePath(basename(path), path)
file <- file.path(path, 'ui.R')
}
ui <- source(file = file)
return(ui[[1]])
}
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R Package Documentation
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We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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