Create the server and UI function for the shiny app

End-users: This is the most important function for you to start a teal app that is composed of teal modules.

Usage

init(
  data,
  modules,
  filter = teal_slices(),
  title = build_app_title(),
  header = tags$p(),
  footer = tags$p(),
  id = character(0)
)

Arguments

data: (teal_data or teal_data_module) For constructing the data object, refer to teal_data() and teal_data_module().
modules: (list or teal_modules or teal_module) nested list of teal_modules or teal_module objects or a single teal_modules or teal_module object. These are the specific output modules which will be displayed in the teal application. See modules() and module() for more details.
filter: (teal_slices) Specifies the initial filter using teal_slices().
title: (shiny.tag or character(1)) The browser window title. Defaults to a title "teal app" with the icon of NEST. Can be created using the build_app_title() or by passing a valid shiny.tag which is a head tag with title and link tag.
header: (shiny.tag or character(1)) The header of the app.
footer: (shiny.tag or character(1)) The footer of the app.
id: (character) Optional string specifying the shiny module id in cases it is used as a shiny module rather than a standalone shiny app. This is a legacy feature.

Value

Named list with server and UI functions.

Details

When initializing the teal app, if datanames are not set for the teal_data object, defaults from the teal_data environment will be used.

Examples

app <- init(
  data = teal_data(
    new_iris = transform(iris, id = seq_len(nrow(iris))),
    new_mtcars = transform(mtcars, id = seq_len(nrow(mtcars))),
    code = "
      new_iris <- transform(iris, id = seq_len(nrow(iris)))
      new_mtcars <- transform(mtcars, id = seq_len(nrow(mtcars)))
    "
  ),
  modules = modules(
    module(
      label = "data source",
      server = function(input, output, session, data) {},
      ui = function(id, ...) div(p("information about data source")),
      datanames = "all"
    ),
    example_module(label = "example teal module"),
    module(
      "Iris Sepal.Length histogram",
      server = function(input, output, session, data) {
        output$hist <- renderPlot(
          hist(data()[["new_iris"]]$Sepal.Length)
        )
      },
      ui = function(id, ...) {
        ns <- NS(id)
        plotOutput(ns("hist"))
      },
      datanames = "new_iris"
    )
  ),
  filter = teal_slices(
    teal_slice(dataname = "new_iris", varname = "Species"),
    teal_slice(dataname = "new_iris", varname = "Sepal.Length"),
    teal_slice(dataname = "new_mtcars", varname = "cyl"),
    exclude_varnames = list(new_iris = c("Sepal.Width", "Petal.Width")),
    mapping = list(
      `example teal module` = "new_iris Species",
      `Iris Sepal.Length histogram` = "new_iris Species",
      global_filters = "new_mtcars cyl"
    )
  ),
  title = "App title",
  header = tags$h1("Sample App"),
  footer = tags$p("Copyright 2017 - 2023")
)
if (interactive()) {
  shinyApp(app$ui, app$server)
}