Mobify Bellows

A mobile-first accordion UI module for progressive disclosure on the web.

Demo

You can find a simple demo on the Documentation page. More demos can be found inside the examples folder in the repo. Run grunt examples to see them in Chrome (mobile device emulation is recommended).

Requirements

• jQuery
• Velocity.js
• Mobify's Plugin Factory

Zepto Support

Bellows supports Zepto up until v5.1.2 but is not actively developed for it. While we don't actively support Zepto for Bellows, we welcome any and all issues and PRs to help us make it work.

Installation

Bellows can be installed using NPM:

npm install bellows-ui

Usage with Require.js

To use with require.js, after installing through NPM you merely have to reference bellows in your require config file (Note: If your project already has these external dependencies, and the versions are compatible, it's recommended that you use the one in your project to reduce duplication):

{
    'paths': {
        '$': 'node_modules/bellows-ui/node_modules/jquery/dist/jquery.min',
        'plugin': 'node_modules/bellows-ui/node_modules/mobify-plugin/dist/plugin.min',
        'velocity': 'node_modules/bellows-ui/node_modules/velocity-animate/velocity'
        'bellows': 'node_modules/bellows-ui/dist/bellows.min',
    }
}

And then require bellows in as needed:

define(
    ['$', 'bellows'],
    function($) {
        $('.bellows').bellows();
    }
);

Usage

At a bare minimum, your markup structure should follow the above structure. You should have at least one bellows__item. Content within bellows__header and bellows__content can be whatever you want. You may also style either of those however you need. Our default theme will give you some standard styling for those sections but, if you want to theme Bellows yourself, we recommend not including the theme file and starting from scratch.

<!-- Include the CSS -->
<link rel="stylesheet" href="bellows.min.css">

<!-- Optionally include the Theme file -->
<link rel="stylesheet" href="bellows-style.min.css">

<!-- Include the markup -->
<div class="bellows">
    <!-- The Accordion Items -->
    <div class="bellows__item">
        <div class="bellows__header">
            <!-- Item Header - Content can be whatever you want -->
        </div>
        <div class="bellows__content">
            <!-- Item Content - Content can be whatever you want -->
        </div>
    </div>
    <div class="bellows__item">
        <div class="bellows__header">
            <h3>Header</h3>
        </div>
        <div class="bellows__content">
            <p>Content</p>
        </div>
    </div>
    <!-- Use the disabled class if you want items to not respond to open/closed events -->
    <div class="bellows__item bellows--is-disabled">
        <div class="bellows__header">
            <h3>Header</h3>
        </div>
        <div class="bellows__content">
            <p>Content</p>
        </div>
    </div>
</div>

<!-- Include dependencies -->
<script src="jqueryin.js"></script>
<script src="node_modules/velocity-animate/velocity.min.js"></script>
<script src="node_modules/mobify-plugin/dist/plugin.min.js"></script>

<!-- Include bellows.js -->
<script src="bellows.min.js"></script>

<!-- Construct Bellows -->
<script>$('.bellows').bellows()</script>

Initializing the plugin

bellows()

Initializes the bellows.

$('.bellows').bellows();

bellows(options)

Initialize with options.

$('.bellows').bellows({
    singleItemOpen: false,
    duration: 200,
    easing: 'swing',
    open: function(e, ui) {},
    opened: function(e, ui) {},
    close: function(e, ui) {},
    closed: function(e, ui) {}
});

Options

singleItemOpen

default: false

When set to true will force only one item open at a time.

$('.bellows').bellows({
    singleItemOpen: true
});

duration

default: 200

Sets the duration for the animation.

$('.bellows').bellows({
    duration: 600
});

easing

default: swing

Sets the easing for the animation. Bellows takes all of the same easing properties that Velocity.js accepts.

• jQuery UI's easings and CSS3's easings ("ease", "ease-in", "ease-out", and "ease-in-out"), which are pre-packaged into Velocity. A bonus "spring" easing (sampled in the CSS Support pane) is also included.

• CSS3's bezier curves: Pass in a four-item array of bezier points. (Refer to Cubic-Bezier.com for crafing custom bezier curves.)
• Spring physics: Pass a two-item array in the form of [ tension, friction ]. A higher tension (default: 600) increases total speed and bounciness. A lower friction (default: 20) increases ending vibration speed.
• Step easing: Pass a one-item array in the form of [ steps ]. The animation will jump toward its end values using the specified number of steps.

For more information, check out Velocity's docs on easing.

$('.bellows').bellows({
    easing: 'ease-in-out'
});

open

default: function(e, ui) {}

Triggered every time the selected bellows item is starting to open.

Parameters

Parameter name	Description
e	An Event object passed to the callback
ui	An object containing any associated data for use inside the callback

$('.bellows').bellows({
    open: function(e, ui) {
        // ui.item contains the item opening
    }
});

opened

default: function(e, ui) {}

Triggered every time the selected bellows item has finished opening.

Parameters

Parameter name	Description
e	An Event object passed to the callback
ui	An object containing any associated data for use inside the callback

$('.bellows').bellows({
    opened: function(e, ui) {
        // ui.item contains the item that opened
    }
});

close

default: function(e, ui) {}

Triggered every time an bellows item is starting to close.

Parameter name	Description
e	An Event object passed to the callback
ui	An object containing any associated data for use inside the callback

$('.bellows').bellows({
    close: function(e, ui) {
        // ui.item contains the item closing
    }
});

closed

default: function(e, ui) {}

Triggered every time an bellows item is finished closing.

Parameter name	Description
e	An Event object passed to the callback
ui	An object containing any associated data for use inside the callback

$('.bellows').bellows({
    closed: function(e, ui) {
        // ui.item contains the item that closed
    }
});

Methods

open

Open the selected bellows item by element reference

$bellows.bellows('open', $('.bellows__item'));

or by index

$bellows.bellows('open', 1);

openAll

Opens all the bellows items

$bellows.bellows('openAll');

close

Close the selected bellows item by element reference

$bellows.bellows('close', $('.bellows__item'));

or by index

$bellows.bellows('close', 1);

closeAll

Closes all the bellows items

$bellows.bellows('closeAll');

toggle

Toggle the selected bellows item by element reference

$bellows.bellows('toggle', $('.bellows__item'));

or by index

$bellows.bellows('toggle', 1);

toggleAll

Toggles all the bellows items

$bellows.bellows('closeAll');

add

Adds new items to bellows, and correctly wraps their content elements. Optional third parameter allows you to replace all existing elements with the ones specified.

$bellows.bellows('add', items);

or replacing existing elements

$bellows.bellows('add', items, true);

Known Issues and Workarounds

When the singleItemOpen configuration option is selected and the bellows items contain content that is larger than the overall viewport, closing an item can leave the user disoriented. This is due to the way singleItemOpen works; it closes all open items, then animates the selected one open. This can cause the positioning of the active item in the viewport to shift either up or down, resulting it it not being in the same position as when it was clicked.

To get around this, you can scroll to the item once the animation finishes. To do so, you just need to add the following to the opened event:

$('.bellows').bellows({
    singleItemOpen: true,
    opened: function(e, ui) {
        Velocity.animate(ui.item, 'scroll');
    }
});

This will scroll the viewport to the opened bellows item, restoring its position in the viewport.

Browser Compatibility

Browser	Version	Support
Mobile Safari	4.0.x	Degraded. No transitions.
Mobile Safari	5.0+	Supported.
Android Browser	4.0+	Supported.
Android Browser	2.3.x	Degraded. No transitions.
Chrome (Android)	1.0+	Supported.

Building a distribution

Requirements

• Node.js v4.x LTS + NPM v2.x (Mobify recommends NVM for installing Node + NPM)
• Grunt
  • Install with npm install -g grunt-cli

Steps

1. npm install
2. grunt build

The dist directory will be populated with minified versions of the css and javascript files for distribution and use with whatever build system you might use. The src directory has our raw unminified Sass and Javascript files if you prefer to work with those.

License

MIT License. Bellows is Copyright © 2016 Mobify. It is free software and may be redistributed under the terms specified in the LICENSE file.