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Houdini Build Status

A simple collapse-and-expand and accordion script.

Supports deep linking to a specific collapsed content via anchor links (ex. Browser back button can be used to navigate back through content.

Download Houdini / View the Demo

Want to learn how to write your own vanilla JS plugins? Check out "The Vanilla JS Guidebook" and level-up as a web developer. 🚀

Getting Started

Compiled and production-ready code can be found in the dist directory. The src directory contains development code.

1. Include Houdini on your site.

<link rel="stylesheet" href="dist/css/houdini.css">
<script src="dist/js/houdini.js"></script>

2. Add the markup to your HTML.

Add the .collapse-toggle class to your toggle element, and the .collapse class to your content. You also need to add the [data-collapse] attribute to your toggle element, and provide an href that matches the id of the content you want to expand-and-collapse.

<a class="collapse-toggle" data-collapse href="#show-me">
	<span class="collapse-text-show">Show +</span>
	<span class="collapse-text-hide">Hide -</span>
<div class="collapse" id="show-me">
	<p>Now you see me, now you don't.</p>

Expanded by Default

If you'd prefer to show content by default, include the .active class along with the .collapse and .collapse-toggle classes.

<a class="collapse-toggle active" data-collapse href="#hide-me">
	<span class="collapse-text-show">Show +</span>
	<span class="collapse-text-hide">Hide -</span>
<div class="collapse active" id="hide-me">
	<p>Hide me!</p>


Houdini also supports expand-and-collapse accordion groups. Add a [data-group] attribute to every toggle in the accordion, and make sure they all have the same value. Houdini will sort out the rest.

<a class="collapse-toggle active" data-collapse data-group="accordion" href="#section1">
	Section 1
	<span class="collapse-text-show">+</span>
	<span class="collapse-text-hide">-</span>
<div class="collapse active" id="section1">
	<h3>Section 1</h3>
	<p>The quick, brown fox jumps over a lazy dog. DJs flock by when MTV ax quiz prog. Junk MTV quiz graced by fox whelps. Bawds jog, flick quartz, vex nymphs.</p>
<a class="collapse-toggle" data-collapse data-group="accordion" href="#section2">
	Section 2
	<span class="collapse-text-show">+</span>
	<span class="collapse-text-hide">-</span>
<div class="collapse" id="section2">
	<h3>Section 2</h3>
	<p>Waltz, bad nymph, for quick jigs vex! Fox nymphs grab quick-jived waltz. Brick quiz whangs jumpy veldt fox. Bright vixens jump; dozy fowl quack. Quick wafting zephyrs vex bold Jim. Quick zephyrs blow, vexing daft Jim. Sex-charged fop blew my junk TV quiz. How quickly daft jumping zebras vex. Two driven jocks help fax my big quiz.</p>
<a class="collapse-toggle" data-collapse data-group="accordion" href="#section3">
	Section 3
	<span class="collapse-text-show">+</span>
	<span class="collapse-text-hide">-</span>
<div class="collapse" id="section3">
	<h3>Section 3</h3>
	<p>Quick, Baz, get my woven flax jodhpurs! "Now fax quiz Jack!" my brave ghost pled. Five quacking zephyrs jolt my wax bed. Flummoxed by job, kvetching W. zaps Iraq. Cozy sphinx waves quart jug of bad milk. A very bad quack might jinx zippy fowls.</p>

3. Initialize Houdini.

In the footer of your page, after the content, initialize Houdini. And that's it, you're done. Nice work!


Installing with Package Managers

You can install Houdini with your favorite package manager or module loader directly from NPM.

npm install houdinijs

Working with the Source Files

If you would prefer, you can work with the development code in the src directory using the included Gulp build system.


Make sure these are installed first.

Quick Start

  1. In bash/terminal/command line, cd into your project directory.
  2. Run npm install to install required files.
  3. When it's done installing, run one of the task runners to get going:
    • gulp manually compiles files.
    • gulp watch automatically compiles files and applies changes using LiveReload.

Options and Settings

Houdini includes smart defaults and works right out of the box. But if you want to customize things, it also has a robust API that provides multiple ways for you to adjust the default options and settings.

Global Settings

You can pass options and callbacks into Houdini through the init() function:

	selectorToggle: '[data-collapse]', // Collapse toggle selector
	selectorContent: '.collapse', // Collapse content selector
	toggleActiveClass: 'active', // Class added to active toggle elements
	contentActiveClass: 'active', // Class added to active content elements
	initClass: 'js-houdini', // Class added to `<html>` element when initiated
	stopVideo: true, // If true, stop any videos that are playing when content is collapsed
	callbackOpen: function ( content, toggle ) {}, // Function that's run after content is expanded
	callbackClose: function ( content, toggle ) {} // Function that's run after content is collapse

Use Houdini events in your own scripts

You can also call the Houdini toggle event in your own scripts.


Expand a closed content area.

	contentID, // The ID of the content area to expand. ex. '#content'
	toggle, // Node that toggles the expand and collapse action. ex. document.querySelector('#toggle') [optional]
	options // Classes and callbacks. Same options as those passed into the init() function. [optional]


houdini.openContent( '#show-me' );
houdini.openContent( '#show-me-too', document.querySelector( 'a[href*="#show-me-too"]' ) );


Expand a closed content area.

	contentID, // The ID of the content area to collapse. ex. '#content'
	toggle, // Node that toggles the expand and collapse action. ex. document.querySelector('#toggle') [optional]
	options // Classes and callbacks. Same options as those passed into the init() function. [optional]


houdini.closeContent( '#hide-me' );
houdini.closeContent( '#hide-me-too', document.querySelector( 'a[href*="#show-me-too"]' ) );


Destroy the current houdini.init(). This is called automatically during the init function to remove any existing initializations.


Browser Compatibility

Houdini works in all modern browsers, and IE 10 and above. You can push browser support back to IE 9 with the classList.js polyfill.

Houdini is built with modern JavaScript APIs, and uses progressive enhancement. If the JavaScript file fails to load, or if your site is viewed on older and less capable browsers, all content will be displayed by default. If you need to support older browsers, you can still download the jQuery version of Houdini on GitHub.


Please review the support guidelines.


The code is available under the MIT License.