select_spec: Column selection input specification

In teal.transform: Functions for Extracting and Merging Data in the 'teal' Framework

Column selection input specification

Description

select_spec is used inside teal to create a shiny::selectInput() that will select columns from a dataset.

Usage

select_spec(
  choices,
  selected = if (inherits(choices, "delayed_data")) NULL else choices[1],
  multiple = length(selected) > 1 || inherits(selected, "all_choices"),
  fixed = FALSE,
  always_selected = NULL,
  ordered = FALSE,
  label = "Select"
)

select_spec.delayed_data(
  choices,
  selected = NULL,
  multiple = length(selected) > 1,
  fixed = FALSE,
  always_selected = NULL,
  ordered = FALSE,
  label = NULL
)

select_spec.default(
  choices,
  selected = choices[1],
  multiple = length(selected) > 1,
  fixed = FALSE,
  always_selected = NULL,
  ordered = FALSE,
  label = NULL
)

Arguments

choices	(character or delayed_data) object. Named character vector to define the choices of a shiny shiny::selectInput(). These have to be columns in the dataset defined in the data_extract_spec() where this is called. delayed_data objects can be created via variable_choices() or value_choices().
selected	(optional character or NULL or all_choices or delayed_data). Named character vector to define the selected values of a shiny shiny::selectInput(). Passing an all_choices() object indicates selecting all possible choices. Defaults to the first value of choices or NULL for delayed data loading.
multiple	(logical) Whether multiple values shall be allowed in the shiny shiny::selectInput().
fixed	(optional logical). data_extract_spec() specific feature to hide the choices selected in case they are not needed. Setting fixed to TRUE will not allow the user to select columns. It will then lead to a selection of columns in the dataset that is defined by the developer of the app.
always_selected	(character) Additional column names from the data set that should always be selected
ordered	(logical(1)) Flags whether selection order should be tracked.
label	(optional character). Define a label on top of this specific shiny shiny::selectInput(). The default value is "Select".

Value

A select_spec-S3 class object or delayed_select_spec-S3-class object. It contains all input values.

If select_spec, then the function double checks the choices and selected inputs.

Examples

# Selection with just one column allowed
select_spec(
  choices = c("AVAL", "BMRKR1", "AGE"),
  selected = c("AVAL"),
  multiple = FALSE,
  fixed = FALSE,
  label = "Column"
)

# Selection with just multiple columns allowed
select_spec(
  choices = c("AVAL", "BMRKR1", "AGE"),
  selected = c("AVAL", "BMRKR1"),
  multiple = TRUE,
  fixed = FALSE,
  label = "Columns"
)

# Selection without user access
select_spec(
  choices = c("AVAL", "BMRKR1"),
  selected = c("AVAL", "BMRKR1"),
  multiple = TRUE,
  fixed = TRUE,
  label = "Columns"
)

# Delayed version
select_spec(
  label = "Select variable:",
  choices = variable_choices("ADSL", c("BMRKR1", "BMRKR2")),
  selected = "BMRKR1",
  multiple = FALSE,
  fixed = FALSE
)

# all_choices passed to selected
select_spec(
  label = "Select variable:",
  choices = variable_choices("ADSL", c("BMRKR1", "BMRKR2")),
  selected = all_choices()
)

# Both below objects are semantically the same
select_spec(choices = variable_choices("ADSL"), selected = variable_choices("ADSL"))
select_spec(choices = variable_choices("ADSL"), selected = all_choices())

teal.transform documentation built on May 29, 2024, 5:06 a.m.