Multimodal

A plugin for Reveal.js to show content in modal windows.

Multimodal can be used as a lightbox or actual modal to showcase images, video or HTML content from wihin a presentation. It can be triggered from text links, images, or buttons, or automatically when a slide is shown.

• Demo
• Markdown demo

Basics

There are really only three steps:

1. Install Multimodal
2. Add the multimodal data-attributes to your links
3. Enjoy the modals

Installation

Regular installation

Copy the multimodal folder to the plugins folder of the reveal.js folder, like this: plugin/multimodal.

npm installation

This plugin is published to, and can be installed from, npm.

npm install reveal.js-multimodal

The Multimodal plugin folder can then be referenced from node_modules/reveal.js-multimodal/plugin/multimodal

Setup

JavaScript

There are two JavaScript files for Multimodal, a regular one, multimodal.js, and a module one, multimodal.esm.js. You only need one of them:

Regular

If you're not using ES modules, for example, to be able to run your presentation from the filesystem, you can add it like this:

<script type="text/javascript" src="dist/reveal.js"></script>
<script src="plugin/multimodal/multimodal.js"></script>
<script>
	Reveal.initialize({
		// ...
		plugins: [ Multimodal ]
	});
</script>

As a module

If you're using ES modules, you can add it like this:

<script type="module">
	// This will need a server
	import Reveal from './dist/reveal.esm.js';
	import Multimodal from './plugin/multimodal/multimodal.esm.js';
	Reveal.initialize({
		// ...
		plugins: [ Multimodal ]
	});
</script>

Styling

The styling of Multimodal is automatically inserted when the multimodal folder is manually copied to the Reveal.js plugin folder.

If you import reveal.js-multimodal from npm, you will need to import the CSS file yourself. Depending on your setup this can be something like this:

import 'reveal.js-multimodal/plugin/multimodal/multimodal.css';

Note that if you use 'import' like this, then in the csspath option (in the Reveal multimodal options) should be set to false. But if you know the actual full path to the CSS file, then you can still use the csspath option and keep cssautoload set to true.

Markup

It is easy to set up your HTML structure for Multimodal. To show a modal, it needs to be triggered from a trigger. A trigger needs at least a data-modal-type.

• From a data-modal-url in an anchor tag
• From an href attribute in an anchor tag
• From a data-modal-url in a button tag

<a href="#" data-modal-type="image" data-modal-url="assets/img/1.jpg">a data-modal-url</a>
<a href="assets/img/2.jpg" data-modal-type="image">an href attribute</a>
<a href="#" data-modal-type="image" data-modal-url="assets/img/3.jpg">a data-modal-url</a>

For Markdown markup, check the Markdown demo above.

Of course, you also need to make sure that the content you are linking to (an image, a video, a piece of HTML) is there where you expect it.

Navigation changes

• The arrow keys will close modals and go to the next slide
• The space bar or escape key will only close the modal

Override navigation

To prevent the user from accidentally navigating to another slide while the modal is open, you can add the data-modal-navblock attribute to the triggering element.

<a href="assets/img/3.jpg" data-modal-type="image" data-modal-navblock="true">Show modal</a>

Slide modals

To automatically open a modal when a slide is shown, add the data-modal-type and data-modal-url attributes to the section element.

<section data-modal-type="image" data-modal-url="assets/img/4.jpg">
  <h2>Slide modals</h2>
  <!-- Slide content here -->
</section>

Events

There are 4 events that may help you do things in your modals: multimodal:show, multimodal:shown, multimodal:hide, and multimodal:hidden. Details are in event.detail. Use it like this:

deck.addEventListener("multimodal:shown", async (event) => {
  const triggerInfo = event.detail.trigger;
  console.log("Trigger type:", triggerInfo.dataset.modalType);
});

Configuration

There are a few options that you can change from the Reveal.js options. The values below are default and do not need to be set if they are not changed.

Reveal.initialize({
  // ...
  multimodal: {
    border: "1px solid white",
    background: {
      html: "var(--r-background-color)",
      iframe: "var(--r-background-color)",
      media: "white"
    },
    closebuttonhtml: '',
    cssautoload: true,
    csspath: '',
    htmlminwidth: "100px",
    htmlminheight: "100px",
    shadow: "0 0.5em 0.75em 0.5em rgba(0, 0, 0, 0.25)",
    overlaycolor: "rgba(0, 0, 0, 0.30)",
    padding: {
      html: "1em",
      iframe: "0",
      media: "0"
    },
    radius: "0.5em",
    scalecorrection: true,
    slidemodalevent: "slidetransitionend",
    speed: 300,
    videoautoplay: true,
    videocontrols: true,
    videoautohide: true,
    zoom: true,
    zoomfrom: 0.90
  },
  plugins: [ Multimodal ]
});

Documentation about these options can be found in the demo for now.

Like it?

If you like it, please star this repo!

And if you want to show off what you made with it, please do :-)

License

MIT licensed

Copyright (C) 2024 Martijn De Jongh (Martino)