Modal: Modal

ModalR Documentation


Modals are temporary pop-ups that take focus from the page or app and require people to interact with them. Unlike a dialog box (Dialog), a modal should be used for hosting lengthy content, such as privacy statements or license agreements, or for asking people to perform complex or multiple actions, such as changing settings.

For more details and examples visit the official docs. The R package cannot handle each and every case, so for advanced use cases you need to work using the original docs to achieve the desired result.





Props to pass to the component. The allowed props are listed below in the Details section.


  • allowTouchBodyScroll boolean
    Allow body scroll on content and overlay on touch devices. Changing after mounting has no effect.

  • className string
    Optional class name to be added to the root class

  • componentRef ⁠IRefObject<IModal>⁠
    Optional callback to access the IDialog interface. Use this instead of ref for accessing the public methods and properties of the component.

  • containerClassName string
    Optional override for container class

  • dragOptions IDragOptions
    The options to make the modal draggable

  • enableAriaHiddenSiblings boolean
    Puts aria-hidden=true on all non-ancestors of the current modal, for screen readers. This is an experimental feature that will be graduated to default behavior after testing. This flag will be removed with the next major release.

  • isBlocking boolean
    Whether the dialog can be light dismissed by clicking outside the dialog (on the overlay).

  • isDarkOverlay boolean
    Whether the overlay is dark themed.

  • isModeless boolean
    Whether the dialog should be modeless (e.g. not dismiss when focusing/clicking outside of the dialog). if true: isBlocking is ignored, there will be no overlay (isDarkOverlay is ignored), isClickableOutsideFocusTrap is true, and forceFocusInsideTrap is false

  • isOpen boolean
    Whether the dialog is displayed.

  • layerProps ILayerProps
    Defines an optional set of props to be passed through to Layer

  • onDismiss ⁠(ev?: React.MouseEvent<HTMLButtonElement>) => any⁠
    A callback function for when the Modal is dismissed light dismiss, before the animation completes.

  • onDismissed ⁠() => any⁠
    A callback function which is called after the Modal is dismissed and the animation is complete.

  • onLayerDidMount ⁠() => void⁠
    A callback function for when the Modal content is mounted on the overlay layer

  • overlay IOverlayProps
    Defines an optional set of props to be passed through to Overlay

  • scrollableContentClassName string
    Optional override for scrollable content class

  • styles ⁠IStyleFunctionOrObject<IModalStyleProps, IModalStyles>⁠
    Call to provide customized styling that will layer on top of the variant rules.

  • subtitleAriaId string
    ARIA id for the subtitle of the Modal, if any

  • theme ITheme
    Theme provided by High-Order Component.

  • titleAriaId string
    ARIA id for the title of the Modal, if any

  • topOffsetFixed boolean
    Whether the modal should have top offset fixed once opened and expand from the bottom only when the content changes dynamically.


Object with shiny.tag class suitable for use in the UI of a Shiny app.

Best practices


  • Use a variable width with a minimum width of 288 pixels.

  • Use a variable height with a minimum height of 172 pixels.

  • Center vertically and horizontally in the available space.

  • Always have at least one focusable element inside a modal.

  • Blocking modals (⁠Modeless Modal⁠) should be used very sparingly, only when it's critical for people to make a choice or provide information before they can proceed.

  • Provide a clear way for people to dismiss the control, such as a Close button, which should always go in the upper right corner.


  • Use sentence-style capitalization—only capitalize the first word. For more info, see Capitalization in the Microsoft Writing Style Guide.



ui <- function(id) {
  ns <- NS(id)
    PrimaryButton.shinyInput(ns("showModal"), text = "Show modal"),

server <- function(id) {
  moduleServer(id, function(input, output, session) {
    ns <- session$ns
    modalVisible <- reactiveVal(FALSE)
    observeEvent(input$showModal, modalVisible(TRUE))
    observeEvent(input$hideModal, modalVisible(FALSE))
    output$modal <- renderReact({
      Modal(isOpen = modalVisible(),
        Stack(tokens = list(padding = "15px", childrenGap = "10px"),
          div(style = list(display = "flex"),
            Text("Title", variant = "large"),
            div(style = list(flexGrow = 1)),
              iconProps = list(iconName = "Cancel")
            p("A paragraph of text."),
            p("Another paragraph.")

if (interactive()) {
  shinyApp(ui("app"), function(input, output) server("app"))

Appsilon/shiny.fluent documentation built on June 4, 2024, 7:02 p.m.