Wikipedia Preview

Wikipedia Preview is a JavaScript component that allows you to provide context from Wikipedia about words or phrases on any website. It lets you show a popup card with a short summary from Wikipedia when a reader hovers over a link.

Desktop	Mobile

Storybook: https://wikimedia.github.io/wikipedia-preview/storybook-static

Compatibility

Browsers	Versions
Chrome, Firefox, Opera, Edge	Current and previous version
Internet Explorer	11+
Safari	5.1+
iOS	6.1+
Android	4.1+

Features

• Works with any link that has an article on Wikipedia
• Works for LTR languages
• Works for articles with or without a lead image

Getting Started

Standalone Script

<script src="wikipedia-preview.production.js"></script>
<script type="text/javascript">
  wikipediaPreview.init()
</script>

You can serve the file yourself or include it from unpkg.

NPM

$ npm install wikipedia-preview --save

const wikipediaPreview = require('wikipedia-preview')
wikipediaPreview.init()

Options of the init function

The init function accepts the following options:

Name	Type	Default	Description
root	DOM Element	document	Where to look for elements that should have the popup
selector	string	'[data-wikipedia-preview]'	How nodes that should have the popup are identified
lang	string	'en'	Default Wikipedia language
popupContainer	DOM Element	document.body	Where to put the popup in the DOM
detectLinks	Boolean	false	Allow Wikipedia hyperlinks to have the popup
events	Object	{}	Custom event handlers: { onShow: <fn>, onWikiRead: <fn> }

Example (custom selector)

<p class="content">
	You can learn about <span class="wiki">Chat</span> and <span class="wiki">Chien</span> from Wikipedia.
</p>
<div class="popup-container"></div>

wikipediaPreview.init({
	root: document.querySelector('.content'),
	selector: '.wiki',
	popupContainer: '.popup-container',
	lang: 'fr'
});

Example (detect Wikipedia links)

<p class="content">
	You can learn about <a href="https://en.wikipedia.org/wiki/Chat">Chat</a> and <a href="https://en.wikipedia.org/wiki/Chien">Chien</a> from Wikipedia.
</p>

wikipediaPreview.init({
	detectLinks: true
});

Example (custom event handlers)

wikipediaPreview.init({
	events: {
		onShow: function(title, lang, type) {
			// call custom instrumentation here
		},
		onWikiRead: function(title, lang) {
			// call custom instrumentation here
		}
	}
});

Attributes

data-wikipedia-preview

To indicate that a word or expression should bring up the article preview popup, mark it with the data-wikipedia-preview attribute (or anything else as long as you're using the selector option described above).

data-wp-title

When the article title is not the same as the node's textContent property, use the data-wp-title attribute to specify the article title.

data-wp-lang

To use a language different than the language specified in the options, use the data-wp-lang attribute.

.wmf-wp-with-preview

To use the default trigger link styling:

• Add the following link to the page header:

<link href="wikipedia-preview.css" rel="stylesheet">

• Add the class wmf-wp-with-preview to the node

If you prefer to style them in a way that makes more sense for you context, simply don't include the wikipediaPreview.css link in header and add your own class to the node. Both of these are valid ways:

[data-wikipedia-preview] {
	background-color: yellow;
}

.my-own-css-style {
	background-color: yellow;
}

Acknowledgements/Contributors

This is heavily inspired by jquery.wikilookup and Page Previews.