revealjs-react

A Typescript/React wrapper for the RevealJS Presentation Library with types for Reveal.js as well as plugins.

revealjs-react
- Installation
- Usage
- Components
  - RevealJS
  - Slide
  - Elements
    - Code
    - Audio
    - BlockQuote
    - Div
    - FigCaption
    - Figure
    - Footer
    - H1
    - H2
    - H3
    - H4
    - H5
    - H6
    - Header
    - IFrame
    - Image
    - Li
    - Link
    - Main
    - Note
    - Ol
    - P
    - Span
    - Ul
    - Video
    - Notes
- hooks
  - useReveal
- Using plugins

Installation

npm install -S @gregcello/revealjs-react react reveal.js react-dom

or

yarn add @gregcello/revealjs-react react reveal.js react-dom

Usage

import React from 'react';
import { render } from 'react-dom';
import { RevealJS, Slide, H1 } from 'revealjs-react';
import RevealHighlight from 'revealjs-react/plugins/highlight';

render(
  <RevealJS plugins={[RevealHighlight]}>
    <Slide>
      <H1>Hello, World!</H1>
    </Slide>
  </RevealJS>,
  document.querySelector('#root'),
);

Components

All components support the following properties:

  id?: string; // id for the html component
  className?: string; // any additional class name(s), will be concatenated with the fragment classnames
  fragment?: boolean; // if true, this is treated as a fragment (see the reveal.js documentation)
  fragmentStyle?: string; // any extra fragment-specific style
  fragmentIndex?: number; // the fragment index (see the reveal.js documentation)
  fitText?: boolean; // if true, adds the "r-fit-text" classname (see the reveal.js documentation)

RevealJS

The properties are the same as the configuration object passed to Reveal.initialize(). This package adds an additional property onDeckReady which is called when initialization has succeeded and the API is ready to interact. Alternatively, to define custom interactions with child components, use the useReveal hook.

  plugins = [],

  // Display presentation control arrows
  controls = true,

  // Help the user learn the controls by providing hints, for example by
  // bouncing the down arrow when they first encounter a vertical slide
  controlsTutorial = true,

  // Determines where controls appear, "edges" or "bottom-right"
  controlsLayout = 'bottom-right',

  // Visibility rule for backwards navigation arrows; "faded", "hidden"
  // or "visible"
  controlsBackArrows = 'faded',

  // Display a presentation progress bar
  progress = true,

  // Display the page number of the current slide
  // - true =    Show slide number
  // - false =   Hide slide number
  //
  // Can optionally be set as a string that specifies the number formatting =
  // - "h.v" =   Horizontal . vertical slide number (default)
  // - "h/v" =   Horizontal / vertical slide number
  // - "c" =   Flattened slide number
  // - "c/t" =   Flattened slide number / total slides
  //
  // Alternatively, you can provide a function that returns the slide
  // number for the current slide. The function should take in a slide
  // object and return an array with one string [slideNumber] or
  // three strings [n1,delimiter,n2]. See #formatSlideNumber().
  slideNumber = false,

  // Can be used to limit the contexts in which the slide number appears
  // - "all" =      Always show the slide number
  // - "print" =    Only when printing to PDF
  // - "speaker" =  Only in the speaker view
  showSlideNumber = 'all',

  // Use 1 based indexing for # links to match slide number (default is zero
  // based)
  hashOneBasedIndex = false,

  // Add the current slide number to the URL hash so that reloading the
  // page/copying the URL will return you to the same slide
  hash = false,

  // Flags if we should monitor the hash and change slides accordingly
  respondToHashChanges = true,

  // Push each slide change to the browser history.  Implies `hash = true`
  history = false,

  // Enable keyboard shortcuts for navigation
  keyboard = true,

  // Optional function that blocks keyboard events when retuning false
  //
  // If you set this to 'focused', we will only capture keyboard events
  // for embedded decks when they are in focus
  keyboardCondition = null,

  // Disables the default reveal.js slide layout (scaling and centering)
  // so that you can use custom CSS layout
  disableLayout = false,

  // Enable the slide overview mode
  overview = true,

  // Vertical centering of slides
  center = true,

  // Enables touch navigation on devices with touch input
  touch = true,

  // Loop the presentation
  loop = false,

  // Change the presentation direction to be RTL
  rtl = false,

  // Changes the behavior of our navigation directions.
  //
  // "default"
  // Left/right arrow keys step between horizontal slides, up/down
  // arrow keys step between vertical slides. Space key steps through
  // all slides (both horizontal and vertical).
  //
  // "linear"
  // Removes the up/down arrows. Left/right arrows step through all
  // slides (both horizontal and vertical).
  //
  // "grid"
  // When this is enabled, stepping left/right from a vertical stack
  // to an adjacent vertical stack will land you at the same vertical
  // index.
  //
  // Consider a deck with six slides ordered in two vertical stacks =
  // 1.1    2.1
  // 1.2    2.2
  // 1.3    2.3
  //
  // If you're on slide 1.3 and navigate right, you will normally move
  // from 1.3 -> 2.1. If "grid" is used, the same navigation takes you
  // from 1.3 -> 2.3.
  navigationMode = 'default',

  // Randomizes the order of slides each time the presentation loads
  shuffle = false,

  // Turns fragments on and off globally
  fragments = true,

  // Flags whether to include the current fragment in the URL,
  // so that reloading brings you to the same fragment position
  fragmentInURL = true,

  // Flags if the presentation is running in an embedded mode,
  // i.e. contained within a limited portion of the screen
  embedded = false,

  // Flags if we should show a help overlay when the question-mark
  // key is pressed
  help = true,

  // Flags if it should be possible to pause the presentation (blackout)
  pause = true,

  // Flags if speaker notes should be visible to all viewers
  showNotes = false,

  // Global override for autolaying embedded media (video/audio/iframe)
  // - null =   Media will only autoplay if data-autoplay is present
  // - true =   All media will autoplay, regardless of individual setting
  // - false =  No media will autoplay, regardless of individual setting
  autoPlayMedia = null,

  // Global override for preloading lazy-loaded iframes
  // - null =   Iframes with data-src AND data-preload will be loaded when within
  //           the viewDistance, iframes with only data-src will be loaded when visible
  // - true =   All iframes with data-src will be loaded when within the viewDistance
  // - false =  All iframes with data-src will be loaded only when visible
  preloadIframes = null,

  // Can be used to globally disable auto-animation
  autoAnimate = true,

  // Optionally provide a custom element matcher that will be
  // used to dictate which elements we can animate between.
  autoAnimateMatcher = null,

  // Default settings for our auto-animate transitions, can be
  // overridden per-slide or per-element via data arguments
  autoAnimateEasing = 'ease',
  autoAnimateDuration = 1.0,
  autoAnimateUnmatched = true,

  // CSS properties that can be auto-animated. Position & scale
  // is matched separately so there's no need to include styles
  // like top/right/bottom/left, width/height or margin.
  autoAnimateStyles = [
    'opacity',
    'color',
    'background-color',
    'padding',
    'font-size',
    'line-height',
    'letter-spacing',
    'border-width',
    'border-color',
    'border-radius',
    'outline',
    'outline-offset',
  ],

  // Controls automatic progression to the next slide
  // - 0 =      Auto-sliding only happens if the data-autoslide HTML attribute
  //           is present on the current slide or fragment
  // - 1+ =     All slides will progress automatically at the given interval
  // - false =  No auto-sliding, even if data-autoslide is present
  autoSlide = 0,

  // Stop auto-sliding after user input
  autoSlideStoppable = true,

  // Use this method for navigation when auto-sliding (defaults to navigateNext)
  autoSlideMethod = null,

  // Specify the average time in seconds that you think you will spend
  // presenting each slide. This is used to show a pacing timer in the
  // speaker view
  defaultTiming = null,

  // Enable slide navigation via mouse wheel
  mouseWheel = false,

  // Opens links in an iframe preview overlay
  // Add `data-preview-link` and `data-preview-link="false"` to customise each link
  // individually
  previewLinks = false,

  // Exposes the reveal.js API through window.postMessage
  postMessage = true,

  // Dispatches all reveal.js events to the parent window through postMessage
  postMessageEvents = false,

  // Focuses body when page changes visibility to ensure keyboard shortcuts work
  focusBodyOnPageVisibilityChange = true,

  // Transition style
  transition = 'slide', // none/fade/slide/convex/concave/zoom

  // Transition speed
  transitionSpeed = 'default', // default/fast/slow

  // Transition style for full page slide backgrounds
  backgroundTransition = 'fade', // none/fade/slide/convex/concave/zoom

  // The maximum number of pages a single slide can expand onto when printing
  // to PDF, unlimited by default
  pdfMaxPagesPerSlide = Number.POSITIVE_INFINITY,

  // Prints each fragment on a separate slide
  pdfSeparateFragments = true,

  // Offset used to reduce the height of content within exported PDF pages.
  // This exists to account for environment differences based on how you
  // print to PDF. CLI printing options, like phantomjs and wkpdf, can end
  // on precisely the total height of the document whereas in-browser
  // printing has to end one pixel before.
  pdfPageHeightOffset = -1,

  // Number of slides away from the current that are visible
  viewDistance = 3,

  // Number of slides away from the current that are visible on mobile
  // devices. It is advisable to set this to a lower number than
  // viewDistance in order to save resources.
  mobileViewDistance = 2,

  // The display mode that will be used to show slides
  display = 'block',

  // Hide cursor if inactive
  hideInactiveCursor = true,

  // Time before the cursor is hidden (in ms)
  hideCursorTime = 5000,

  // Parallax background image
  parallaxBackgroundImage = '', // CSS syntax, e.g. "a.jpg"

  // Parallax background size
  parallaxBackgroundSize = '', // CSS syntax, e.g. "3000px 2000px"

  // Parallax background repeat
  parallaxBackgroundRepeat = '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit

  // Parallax background position
  parallaxBackgroundPosition = '', // CSS syntax, e.g. "top left"

  // Number of pixels to move the parallax background per slide
  // - Calculated automatically unless specified
  // - Set to 0 to disable movement along an axis
  parallaxBackgroundHorizontal = 200,
  parallaxBackgroundVertical = 50,

  // The "normal" size of the presentation, aspect ratio will
  // be preserved when the presentation is scaled to fit different
  // resolutions. Can be specified using percentage units.
  width = 960,
  height = 700,

  // Factor of the display size that should remain empty around
  // the content
  margin = 0.04,

  // Bounds for smallest/largest possible scale to apply to content
  minScale = 0.2,
  maxScale = 2.0,

  // a callback to access the deck when it is ready for interaction, accepts a single parameter.
  onDeckReady,

Slide

The Slide component adds a <section> to create a slide. It supports these properties

  autoslide?: true;
  autoAnimate?: true;
  autoAnimateUnmatched?: boolean;
  backgroundColor?: string;
  backgroundImage?: string;
  backgroundSize?: string;
  backgroundPosition?: string;
  backgroundRepeat?: string;
  backgroundOpacity?: string;
  backgroundVideo?: string;
  backgroundVideoLoop?: true;
  backgroundVideoMuted?: true;
  backgroundIframe?: string;
  backgroundInteractive?: true;
  id?: string;
  transition?: Transitions;
  // Transitions can be: 'none' | 'fade' | 'slide' | 'convex' | 'concave' | 'zoom'
  // or a combo of 'fade-in fade-out' or 'slide-in fade-out' etc.
  transitionSpeed?: TransitionSpeed; // 'default' | 'fast' | 'slow'
  visibility?: 'uncounted' | 'hidden';

Elements

Code

The Code component sets helpers for animation across slides. Use the HighlightPlugin to add code highlighting.

  children: { code: string }; // pass `{ code: 'console.log("hello world");' }`, for example
  language?: string; // for example "typescript"
  escape?: boolean; // html escape the code
  lineNumbers?: string | true; // display line numbers. This is turned on if you specify autoAnimateId
  noTrim?: boolean; // if true, disables trimming whitespace on the edges of the code
  // pass in an id that you will use for the same code block in other slides to enable smooth transitions
  // `autoAnimate` must be passed to the slides to enable this (see the reveal.js documentation)
  autoAnimateId?: string;

Audio

The Audio component accepts all the parameters of the audio html tag, plus these properties:

  autoplay?: boolean;
  controls?: boolean;
  lazy?: string; // lazy-loads the audio, using data-src
  loop?: boolean;
  muted?: boolean;
  preload?: boolean; // sets data-preload
  src: string;

BlockQuote

supports all the standard blockquote parameters plus the reveal.js addons above

Div

supports all the standard div parameters plus the reveal.js addons above

FigCaption

supports all the standard figcaption parameters plus the reveal.js addons above

Figure

supports all the standard figure parameters plus the reveal.js addons above

Footer

supports all the standard footer parameters plus the reveal.js addons above

H1

supports all the standard h1 parameters plus the reveal.js addons above

H2

supports all the standard h2 parameters plus the reveal.js addons above

H3

supports all the standard h3 parameters plus the reveal.js addons above

H4

supports all the standard h4 parameters plus the reveal.js addons above

H5

supports all the standard h5 parameters plus the reveal.js addons above

H6

supports all the standard h6 parameters plus the reveal.js addons above

Header

supports all the standard header parameters plus the reveal.js addons above

IFrame

supports all the standard iframe parameters plus the reveal.js addons above, and these

Image

Li

supports all the standard li parameters plus the reveal.js addons above

Link

Main

supports all the standard main parameters plus the reveal.js addons above

Note

Ol

supports all the standard ol parameters plus the reveal.js addons above

P

supports all the standard p parameters plus the reveal.js addons above

Span

supports all the standard span parameters plus the reveal.js addons above

Ul

supports all the standard ul parameters plus the reveal.js addons above

Video

The Audio component accepts all the parameters of the audio html tag, plus these properties:

  autoplay?: boolean;
  controls?: boolean;
  lazy?: string; // lazy-loads the audio, using data-src
  loop?: boolean;
  muted?: boolean;
  preload?: boolean; // sets data-preload
  height?: number;
  preload?: '' | 'metadata' | 'auto' | 'none';
  width?: number;
  src: string[] | string; // this allows specifying multiple video sources or a single source

Notes

Add speaker notes with an aside by using this component.

hooks

In order to access the internal Reveal object, a hook is provided.

useReveal

This can be used to retrieve the current Reveal instance. Note that until the deck is initialized, it will be null. The type of the deck is strictly typed using custom internal types, as @types/reveal is a full major version out of date.

import { useReveal } from "@gregcello/revealjs-react";

export function MyComponent() {
  const { reveal, readyPromise } = useReveal();
  useEffect(() => {
    if (!reveal || !readyPromise) {
      return;
    }
    readyPromise.then(() => {
      // interact with reveal API
      reveal.on('slidechanged', () => { /* do something */ });
    })
  }, [reveal]);
}

Note that this hook must be used in a child component tp the RevealJs component. This will not work:

import { useReveal, RevealJS } from "@gregcello/revealjs-react";

export function MyPresentation() {
  const { reveal, readyPromise } = useReveal();
  // don't do this!
  return (
    <RevealJs>...
    </RevealJs>
  )

Instead, use the onDeckReady prop as documented in the RevealJS component

Using plugins

Built-in plugins from reveal.js are available as direct imports

import {
  HighlightPlugin,
  MarkdownPlugin,
  MathPlugin,
  NotesPlugin,
  SearchPlugin,
  ZoomPlugin,
} from "@gregcello/revealjs-react";

// then in the source

const plugins = [HighlightPlugin, MarkdownPlugin, MathPlugin, NotesPlugin, SearchPlugin, ZoomPlugin];

function MyPresentation() {
  return (
    <RevealJS plugins={plugins}>
      // your slides here
    </RevealJS>
  );
}

Use only the plugins you need. These plugins are strictly typed using custom typescript definitions. To define or type your own custom plugin, use the RevealPlugin type exported from @gregcello/revealjs-react

cellog/revealjs-react

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