teal_modules: Create 'teal_module' and 'teal_modules' objects

In teal: Exploratory Web Apps for Analyzing Clinical Trials Data

Create teal_module and teal_modules objects

Description

Create a nested tab structure to embed modules in a teal application.

Usage

module(
  label = "module",
  server = function(id, data, ...) moduleServer(id, function(input, output, session)
    NULL),
  ui = function(id, ...) tags$p(paste0("This module has no UI (id: ", id, " )")),
  filters,
  datanames = "all",
  server_args = NULL,
  ui_args = NULL,
  transformators = list()
)

modules(..., label = character(0))

## S3 method for class 'teal_module'
format(
  x,
  is_last = FALSE,
  parent_prefix = "",
  what = c("datasets", "properties", "ui_args", "server_args", "decorators",
    "transformators"),
  ...
)

## S3 method for class 'teal_modules'
format(x, is_root = TRUE, is_last = FALSE, parent_prefix = "", ...)

## S3 method for class 'teal_module'
print(x, ...)

## S3 method for class 'teal_modules'
print(x, ...)

Arguments

label	(character(1)) Label shown in the navigation item for the module or module group. For modules() defaults to "root". See Details.
server	(function) shiny module with following arguments: id - teal will set proper shiny namespace for this module (see shiny::moduleServer()). input, output, session - (optional; not recommended) When provided, then shiny::callModule() will be used to call a module. From shiny 1.5.0, the recommended way is to use shiny::moduleServer() instead which doesn't require these arguments. data (optional) If the server function includes a data argument, it will receive a reactive expression containing the teal_data object. datasets (optional) When provided, the module will be called with FilteredData object as the value of this argument. (See teal.slice::FilteredData). reporter (optional) When provided, the module will be called with Reporter object as the value of this argument. (See teal.reporter::Reporter). filter_panel_api (optional) When provided, the module will be called with FilterPanelAPI object as the value of this argument. (See teal.slice::FilterPanelAPI). ... (optional) When provided, server_args elements will be passed to the module named argument or to the ....
ui	(function) shiny UI module function with following arguments: id - teal will set proper shiny namespace for this module. ... (optional) When provided, ui_args elements will be passed to the module named argument or to the ....
filters	(character) Deprecated. Use datanames instead.
datanames	(character) Names of the datasets relevant to the item. There are 2 reserved values that have specific behaviors: The keyword "all" includes all datasets available in the data passed to the teal application. NULL hides the sidebar panel completely. If transformators are specified, their datanames are automatically added to this datanames argument.
server_args	(named list) with additional arguments passed on to the server function.
ui_args	(named list) with additional arguments passed on to the UI function.
transformators	(list of teal_transform_module) that will be applied to transform module's data input. To learn more check vignette("transform-input-data", package = "teal").
...	For modules(): (teal_module or teal_modules) Objects to wrap into a tab. For format() and print(): Arguments passed to other methods.
x	(teal_module or teal_modules) Object to format/print.
is_last	(logical(1)) Whether this is the last item in its parent's children list. Affects the tree branch character used (L- vs |-)
parent_prefix	(character(1)) The prefix inherited from parent nodes, used to maintain the tree structure in nested levels
what	(character) Specifies which metadata to display. Possible values: "datasets", "properties", "ui_args", "server_args", "transformators"
is_root	(logical(1)) Whether this is the root node of the tree. Only used in format.teal_modules(). Determines whether to show "TEAL ROOT" header

Details

module() creates an instance of a teal_module that can be placed in a teal application. modules() shapes the structure of a the application by organizing teal_module within the navigation panel. It wraps teal_module and teal_modules objects in a teal_modules object, which results in a nested structure corresponding to the nested tabs in the final application.

Note that for modules() label comes after ..., so it must be passed as a named argument, otherwise it will be captured by ....

The labels "global_filters" and "Report previewer" are reserved because they are used by the mapping argument of teal_slices() and the report previewer module reporter_previewer_module(), respectively.

Value

module() returns an object of class teal_module.

modules() returns a teal_modules object which contains following fields:

• label: taken from the label argument.

• children: a list containing objects passed in .... List elements are named after their label attribute converted to a valid shiny id.

Restricting datasets used by teal_module:

The datanames argument controls which datasets are used by the module's server. These datasets, passed via server's data argument, are the only ones shown in the module's tab.

When datanames is set to "all", all datasets in the data object are treated as relevant. However, this may include unnecessary datasets, such as:

• Proxy variables for column modifications

• Temporary datasets used to create final ones

• Connection objects

Datasets which name is prefixed in teal_data by the dot (.) are not displayed in the teal application. Please see the "Hidden datasets" section in 'vignette("including-data-in-teal-applications").

datanames with transformators

When transformators are specified, their datanames are added to the module's datanames, which changes the behavior as follows:

• If module(datanames) is NULL and the transformators have defined datanames, the sidebar will appear showing the transformators' datasets, instead of being hidden.

• If module(datanames) is set to specific values and any transformator has datanames = "all", the module may receive extra datasets that could be unnecessary

Examples in Shinylive

example-1

Open in Shinylive

Examples

library(shiny)

module_1 <- module(
  label = "a module",
  server = function(id, data) {
    moduleServer(
      id,
      module = function(input, output, session) {
        output$data <- renderDataTable(data()[["iris"]])
      }
    )
  },
  ui = function(id) {
    ns <- NS(id)
    tagList(dataTableOutput(ns("data")))
  },
  datanames = "all"
)

module_2 <- module(
  label = "another module",
  server = function(id) {
    moduleServer(
      id,
      module = function(input, output, session) {
        output$text <- renderText("Another Module")
      }
    )
  },
  ui = function(id) {
    ns <- NS(id)
    tagList(textOutput(ns("text")))
  },
  datanames = NULL
)

modules <- modules(
  label = "modules",
  modules(
    label = "nested modules",
    module_1
  ),
  module_2
)

app <- init(
  data = teal_data(iris = iris),
  modules = modules
)

if (interactive()) {
  shinyApp(app$ui, app$server)
}
mod <- module(
  label = "My Custom Module",
  server = function(id, data, ...) {},
  ui = function(id, ...) {},
  datanames = c("ADSL", "ADTTE"),
  transformators = list(),
  ui_args = list(a = 1, b = "b"),
  server_args = list(x = 5, y = list(p = 1))
)
cat(format(mod))
custom_module <- function(
    label = "label", ui_args = NULL, server_args = NULL,
    datanames = "all", transformators = list(), bk = FALSE) {
  ans <- module(
    label,
    server = function(id, data, ...) {},
    ui = function(id, ...) {
    },
    datanames = datanames,
    transformators = transformators,
    ui_args = ui_args,
    server_args = server_args
  )
  attr(ans, "teal_bookmarkable") <- bk
  ans
}

dummy_transformator <- teal_transform_module(
  label = "Dummy Transform",
  ui = function(id) div("(does nothing)"),
  server = function(id, data) {
    moduleServer(id, function(input, output, session) data)
  }
)

plot_transformator <- teal_transform_module(
  label = "Plot Settings",
  ui = function(id) div("(does nothing)"),
  server = function(id, data) {
    moduleServer(id, function(input, output, session) data)
  }
)

static_decorator <- teal_transform_module(
  label = "Static decorator",
  server = function(id, data) {
    moduleServer(id, function(input, output, session) {
      reactive({
        req(data())
        within(data(), {
          plot <- plot +
            ggtitle("This is title") +
            xlab("x axis")
        })
      })
    })
  }
)

complete_modules <- modules(
  custom_module(
    label = "Data Overview",
    datanames = c("ADSL", "ADAE", "ADVS"),
    ui_args = list(
      view_type = "table",
      page_size = 10,
      filters = c("ARM", "SEX", "RACE"),
      decorators = list(static_decorator)
    ),
    server_args = list(
      cache = TRUE,
      debounce = 1000,
      decorators = list(static_decorator)
    ),
    transformators = list(dummy_transformator),
    bk = TRUE
  ),
  modules(
    label = "Nested 1",
    custom_module(
      label = "Interactive Plots",
      datanames = c("ADSL", "ADVS"),
      ui_args = list(
        plot_type = c("scatter", "box", "line"),
        height = 600,
        width = 800,
        color_scheme = "viridis"
      ),
      server_args = list(
        render_type = "svg",
        cache_plots = TRUE
      ),
      transformators = list(dummy_transformator, plot_transformator),
      bk = TRUE
    ),
    modules(
      label = "Nested 2",
      custom_module(
        label = "Summary Statistics",
        datanames = "ADSL",
        ui_args = list(
          stats = c("mean", "median", "sd", "range"),
          grouping = c("ARM", "SEX")
        )
      ),
      modules(
        label = "Labeled nested modules",
        custom_module(
          label = "Subgroup Analysis",
          datanames = c("ADSL", "ADAE"),
          ui_args = list(
            subgroups = c("AGE", "SEX", "RACE"),
            analysis_type = "stratified"
          ),
          bk = TRUE
        )
      ),
      modules(custom_module(label = "Subgroup Analysis in non-labled modules"))
    )
  ),
  custom_module("Non-nested module")
)

cat(format(complete_modules))
cat(format(complete_modules, what = c("ui_args", "server_args", "transformators")))
cat(format(complete_modules, what = c("decorators", "transformators")))

teal documentation built on Aug. 21, 2025, 5:58 p.m.