carbon-components
Version:
Carbon Components is a component library for IBM Cloud
102 lines (89 loc) • 3.28 kB
JavaScript
import settings from '../../globals/js/settings';
import mixin from '../../globals/js/misc/mixin';
import createComponent from '../../globals/js/mixins/create-component';
import initComponentBySearch from '../../globals/js/mixins/init-component-by-search';
import handles from '../../globals/js/mixins/handles';
import eventMatches from '../../globals/js/misc/event-matches';
import on from '../../globals/js/misc/on';
class Accordion extends mixin(createComponent, initComponentBySearch, handles) {
/**
* Accordion.
* @extends CreateComponent
* @extends InitComponentBySearch
* @extends Handles
* @param {HTMLElement} element The element working as an accordion.
*/
constructor(element, options) {
super(element, options);
this.manage(
on(this.element, 'click', event => {
const item = eventMatches(event, this.options.selectorAccordionItem);
if (item && !eventMatches(event, this.options.selectorAccordionContent)) {
this._toggle(item);
}
})
);
/**
*
* DEPRECATE in v8
*
* Swapping to a button elemenet instead of a div
* automatically maps click events to keypress as well
* This event listener now is only added if user is using
* the older markup
*/
if (!this._checkIfButton()) {
this.manage(
on(this.element, 'keypress', event => {
const item = eventMatches(event, this.options.selectorAccordionItem);
if (item && !eventMatches(event, this.options.selectorAccordionContent)) {
this._handleKeypress(event);
}
})
);
}
}
_checkIfButton() {
return this.element.firstElementChild.firstElementChild.nodeName === 'BUTTON';
}
/**
* Handles toggling of active state of accordion via keyboard
* @param {Event} event The event triggering this method.
*/
_handleKeypress(event) {
if (event.which === 13 || event.which === 32) {
this._toggle(event.target);
}
}
_toggle(element) {
const heading = element.querySelector(this.options.selectorAccordionItemHeading);
const expanded = heading.getAttribute('aria-expanded');
if (expanded !== null) {
heading.setAttribute('aria-expanded', expanded === 'true' ? 'false' : 'true');
}
element.classList.toggle(this.options.classActive);
}
/**
* The component options.
* If `options` is specified in the constructor,
* {@linkcode NumberInput.create .create()}, or {@linkcode NumberInput.init .init()},
* properties in this object are overriden for the instance being create and how {@linkcode NumberInput.init .init()} works.
* @property {string} selectorInit The CSS selector to find accordion UIs.
*/
static get options() {
const { prefix } = settings;
return {
selectorInit: '[data-accordion]',
selectorAccordionItem: `.${prefix}--accordion__item`,
selectorAccordionItemHeading: `.${prefix}--accordion__heading`,
selectorAccordionContent: `.${prefix}--accordion__content`,
classActive: `${prefix}--accordion__item--active`,
};
}
/**
* The map associating DOM element and accordion UI instance.
* @type {WeakMap}
*/
static components = new WeakMap();
}
export default Accordion;