cheetahR (version 0.3.0)

column_def: Column definition utility

Description

Needed by cheetah to customize columns individually.

Usage

column_def(
  name = NULL,
  width = NULL,
  min_width = NULL,
  max_width = NULL,
  column_type = NULL,
  action = NULL,
  menu_options = NULL,
  style = NULL,
  message = NULL,
  sort = FALSE
)

Value

A list of column options to pass to the JavaScript API.

Arguments

name

Custom name.

width

Column width.

min_width

Column minimal width.

max_width

Column max width.

column_type

Column type. By default, the column type is inferred from the data type of the column. There are 7 possible options:

• "text" for text columns.

• "number" for numeric columns.

• "check" for check columns.

• "image" for image columns.

• "radio" for radio columns.

• "multilinetext" for multiline text columns.

• "menu" for menu selection columns. If column_type == "menu", action parameter must be set to "inline_menu" and menu_options must be provided. Note: Works efficiently only in shiny.

action

The action property defines column actions. Select the appropriate Action class for the column type.

• "input" for input action columns.

• "check" for check action columns.

• "radio" for radio action columns.

• "inline_menu" for menu selection columns.

menu_options

A list of menu options when using column_type = "menu". Each option should be a list with value and label elements. The menu options must be a list of lists, each containing a value and label element. The label element is the label that will be displayed in the menu.

style

Column style.

message

Cell message. Expect a htmlwidgets::JS() function that takes rec as argument. It must return an object with two properties: type for the message type ("info", "warning", "error") and the message that holds the text to display. The latter can leverage a JavaScript ternary operator involving rec.<COLNAME> (COLNAME being the name of the column for which we define the message) to check whether the predicate function is TRUE. You can also use add_cell_message() to generated the expected JS expression. See details for example of usage.

sort

Whether to sort the column. Default to FALSE. May also be a JS callback to create custom logic (does not work yet).

Details

Cell messages

When you write a message, you can pass a function like so:

  <COLNAME> = column_def(
    action = "input",
     message = JS(
      "function(rec) {
         return {
           //info message
           type: 'info',
           message: rec.<COLNAME> ? null : 'Please check.',
         }
       }")
    )

Or use add_cell_message():

  <COLNAME> = column_def(
    action = "input",
     message = add_cell_message(type = "info", message = "Ok")
    )

See add_cell_message() for more details.

Examples

cheetah(
  iris,
  columns = list(
    Sepal.Length = column_def(name = "Length"),
    Sepal.Width = column_def(name = "Width"),
    Petal.Length = column_def(name = "Length"),
    Petal.Width = column_def(name = "Width")
  )
)