@springernature/global-expander

Global Expander

Click a trigger element to toggle the display of a unique target element.

Usage

import {expander} from 'global-expander/js';

expander(options);

<button id="button1" data-expander data-expander-target="#target1">Expander 1</button>
<div id="target1">Target 1</div>

JavaScript

For more flexibility you can use the Expander class directly:

const trigger = document.querySelector('.my-trigger');
const target = document.querySelector('.my-target');

const myExpander = new Expander(trigger, target, options);

myExpander.init();

You can also manually open and close any instance of expander with:

expander.open();
expander.close();

Options

Option	Default Value	Type	Description
TARGET_HIDE_CLASS	'u-js-hide'	String	HTML class to be toggled on the target
TRIGGER_OPEN_CLASS	-	String	HTML class to be toggled to the trigger
TRIGGER_OPEN_LABEL	-	String	Text to set on the trigger when open
CLOSE_ON_FOCUS_OUT	true	Boolean	Closes when you click or tab outside of the target
AUTOFOCUS	false	Boolean	Set focus on the first tabbable element inside the target (will highlight text if appropriate, e.g. input with value)
FOCUS_EVENT	false	Boolean	Dispatch custom event on trigger just before expander focuses on target

The data attribute options are the same, but are lowercase and hyphenated (and strings where the option is a boolean):

• data-expander-target-hide-class
• data-expander-trigger-open-class
• data-expander-trigger-open-label
• data-expander-close-on-clickoff
• data-expander-autofocus
• data-expander-focus-event

Note: data attribute options will take precedence over any options set during initialisation.

Polyfills / Babel plugins required

• plugin-transform-object-assign