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Ethan Hughes

Ethan Hughes

3 years ago

An Accessible, Open-source Lightbox with no Dependencies

Tobii

An accessible, open-source lightbox with no dependencies.

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Open slide with a picture of the Berlin television tower

Features

  • No dependencies
  • Accessible:
    • ARIA roles
    • Keyboard navigation:
      • Prev/ Next Keys: Navigate through slides
      • ESCAPE Key: Close Tobii
      • TAB Key: Focus elements within Tobii, not outside
    • User preference media features:
      • prefers-reduced-motion media query
    • When Tobii opens, focus is set to the first focusable element in Tobii
    • When Tobii closes, focus returns to what was in focus before Tobii opened
  • Touch & Mouse drag support:
    • Drag/ Swipe horizontal to navigate through slides
    • Drag/ Swipe vertical to close Tobii
  • Responsive
  • Support iframes
  • Support inline HTML

Get Tobii

Download

CSS: css/tobii.min.css minified, or css/tobii.css un-minified

JavaScript: js/tobii.min.js minified, or js/tobii.js un-minified

Package managers

Tobii is also available on npm.

npm install tobii --save

Usage

You can install Tobii by linking the .css and .js files to your HTML file. The HTML code may look like this:

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Your page title</title>

  <!-- CSS -->
  <link href="tobii.min.css" rel="stylesheet">
</head>
<body>
  <!-- Your HTML content -->

  <!-- JS -->
  <script src="tobii.min.js"></script>
</body>
</html>

Initialize the script by running:

const tobii = new Tobii()

Media types

Image

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The standard way of using Tobii is a linked thumbnail image with the class name lightbox to a larger image:

<a href="path/to/image.jpg" class="lightbox">
  <img src="path/to/thumbnail.jpg" alt="I am a caption">
</a>

Instead of a thumbnail, you can also refer to a larger image with a text link:

<a href="path/to/image.jpg" class="lightbox">
  Open image
</a>

Inline HTML

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For inline HTML, create an element with a unique ID:

<div id="selector">
  <!-- Your HTML content -->
</div>

Then create a link with the class name lightbox and a href attribute that matches the ID of the element:

<a href="#selector" data-type="html" class="lightbox">
  Open HTML content
</a>

or a button with the class name lightbox and a data-target attribute that matches the ID of the element:

<button type="button" data-type="html" data-target="#selector" class="lightbox">
  Open HTML content
</button>

In both ways, the attribute data-type with the value html is required.

Iframe

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For an iframe, create a link with the class name lightbox:

<a href="https://www.wikipedia.org" data-type="iframe" class="lightbox">
  Open Wikipedia
</a>

or a button with the class name lightbox and a data-target attribute:

<button type="button" data-type="iframe" data-target="https://www.wikipedia.org" class="lightbox">
  Open Wikipedia
</button>

In both ways, the attribute data-type with the value iframe is required.

Optional attributes
  • data-height set the height and data-width the width of the iframe.

YouTube

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For a YouTube video, create a link with the class name lightbox and a data-id attribute with the YouTube video ID:

<a href="#" data-type="youtube" data-id="KU2sSZ_90PY" class="lightbox">
  Open YouTube video
</a>

or a button with the class name lightbox and a data-id attribute with the YouTube video ID:

<button type="button" data-type="youtube" data-id="KU2sSZ_90PY" class="lightbox">
  Open YouTube video
</button>

In both ways, the attribute data-type with the value youtube is required.

Optional attributes
  • data-controls indicates whether the video player controls are displayed: 0 do not display and 1 display controls in the player.
  • data-height set the height and data-width the width of the player. I recommend using an external library for responsive iframes.

Grouping

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If you have a group of related types that you would like to combine into a set, add the data-group attribute:

<a href="path/to/image_1.jpg" class="lightbox" data-group="vacation">
  <img src="path/to/thumbnail_1.jpg" alt="I am a caption">
</a>

<a href="path/to/image_2.jpg" class="lightbox" data-group="vacation">
  <img src="path/to/thumbnail_2.jpg" alt="I am a caption">
</a>

// ...

<a href="path/to/image_4.jpg" class="lightbox" data-group="birthday">
  <img src="path/to/thumbnail_4.jpg" alt="I am a caption">
</a>

// ...

Options

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You can pass an object with custom options as an argument.

const tobii = new Tobii({
  captions: false
})

The following options are available:

Property Type Default Description
selector string “.lightbox” All elements with this class triggers Tobii.
captions bool true Display captions, if available.
captionsSelector “self”, “img” “img” Set the element where the caption is. Set it to “self” for the a tag itself.
captionAttribute string “alt” Get the caption from given attribute.
nav bool, “auto” “auto” Display navigation buttons. “auto” hides buttons on touch-enabled devices.
navText string [“inline svg”, “inline svg”] Text or HTML for the navigation buttons.
navLabel string [“Previous”, “Next”] ARIA label for screen readers.
close bool true Display close button.
closeText string “inline svg” Text or HTML for the close button.
closeLabel string “Close” ARIA label for screen readers.
loadingIndicatorLabel string “Image loading” ARIA label for screen readers.
counter bool true Display current image index.
keyboard bool true Allow keyboard navigation.
zoom bool true Display zoom icon.
zoomText string “inline svg” Text or HTML for the zoom icon.
docClose bool true Click outside to close Tobii.
swipeClose bool true Swipe up to close Tobii.
hideScrollbar bool true Hide browser scrollbars if Tobii is displayed.
draggable bool true Use dragging and touch swiping.
threshold number 100 Touch and mouse dragging threshold (in px).
autoplayVideo bool false Videos will automatically start playing as soon as they can do so without stopping to finish loading the data.

API

Function Description
open(index) Open Tobii. Optional index (Integer), zero-based index of the slide to open.
select(index) Select a slide with index (Integer), zero-based index of the slide to select.
previous() Select the previous slide.
next() Select the next slide.
selectGroup(value) Select a group with value (string), name of the group to select.
close() Close Tobii.
add(element) Add element (DOM element).
remove(element) Remove element (DOM element).
isOpen() Check if Tobii is open.
slidesIndex() Return the current slide index.
slidesCount() Return the current number of slides.
currentGroup() Return the current group name.
reset() Reset Tobii.
destroy() Destroy Tobii.

Events

Bind events with the .on() and .off() methods.

const tobii = new Tobii()

const listener = function listener () {
  console.log('eventName happened')
}

// bind event listener
tobii.on(eventName, listener)

// unbind event listener
tobii.off(eventName, listener)
eventName Description
open Triggered after Tobii has been opened.
previous Triggered after the previous slide is selected.
next Triggered after the next slide is selected.

Browser support

Tobii supports the following browser (all the latest versions):

  • Chrome
  • Firefox
  • Internet Explorer
  • Edge
  • Safari

Contributing

  • Open an issue or a pull request to suggest changes or additions
  • Spread the word

Download Details:

Author: rqrauhvmra

Demo: https://codepen.io/collection/nbqJVV

Source Code: https://github.com/rqrauhvmra/tobii

#javascript

An Accessible, Open-source Lightbox with no Dependencies
3.60 GEEK