carbon-components
Version:
Carbon Components is a component library for IBM Cloud
541 lines (502 loc) • 27.1 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 LeftNav extends mixin(createComponent, initComponentBySearch, handles) {
/**
* Left Navigation.
* @extends CreateComponent
* @extends InitComponentBySearch
* @extends Handles
* @param {HTMLElement} element The element working as a left navigation.
* @param {Object} [options] The component options
* @param {string} [options.selectorLeftNav] The data attribute selector for the nav element in the left nav container.
* @param {string} [options.selectorLeftNavList] The data attribute selector for the main ul element in the left nav.
* @param {string} [options.selectorLeftNavNestedList] The data attribute selector for the nested ul elements in the left nav.
* @param {string} [options.selectorLeftNavToggle]
* The data attribute selector for the button that will show and hide the left navigation.
* @param {string} [options.selectorLeftNavListItem] The data attribute selector for all list items in the left navigation.
* @param {string} [options.selectorLeftNavNestedListItem]
* The data attribute selector for all nested list items in the left navigation.
* @param {string} [options.selectorLeftNavArrowIcon] The data attribute selector for the arrow icons in the left nav.
* @param {string} [options.selectorLeftNavFlyoutMenu] The data attribute selector for the flyout menus in the left nav.
* @param {string} [options.selectorLeftNavFlyoutItem] The data attribute selector for the flyout menu items in the left nav.
* @param {string} [options.selectorLeftNavSection]
* The data attribute selector for the three sections in the header of the left nav.
* @param {string} [options.selectorLeftNavCurrentPage]
* The data attribute selector for the current section title in the left nav header.
* @param {string} [options.selectorLeftNavMainNavHidden] The CSS selector for the hidden main nav.
* @param {string} [options.classActiveLeftNav] The class name for when a left nav is active.
* @param {string} [options.classActiveLeftNavListItem] The class name for when a left nav list item is active.
* @param {string} [options.classExpandedLeftNavListItem] The class name for when a nested list is expanded.
* @param {string} [options.classFlyoutDisplayed] The class name for when a flyout menu is displayed.
* @param {string} [options.classActiveSection] The class name for an active section item in the left nav header.
* @param {string} [options.classItemHasChildren] The class name for when a list item has children.
* @param {string} [options.classTaxonomyIcon] The class name for the taxonomy icon.
*/
constructor(element, options) {
super(element, options);
this.leftNavSectionActive = false;
this.hookOpenActions();
this.hookListSectionEvents();
this.hookListItemsEvents();
this.manage(
on(this.element.ownerDocument, 'click', evt => {
this.handleDocumentClick(evt);
})
);
}
/**
* Closes the menu.
*/
closeMenu() {
this.element.classList.remove(this.options.classActiveLeftNav);
const toggleOpenNode = this.element.ownerDocument.querySelector(this.options.selectorLeftNavToggleOpen);
toggleOpenNode.classList.remove(this.options.classActiveTrigger);
this.element.querySelector(this.options.selectorLeftNav).parentNode.setAttribute('aria-expanded', 'false');
}
/**
* Toggles the menu to open and close.
*/
toggleMenu() {
const leftNavContainer = this.element.querySelector(this.options.selectorLeftNav).parentNode;
this.element.classList.toggle(this.options.classActiveLeftNav);
const toggleOpenNode = this.element.ownerDocument.querySelector(this.options.selectorLeftNavToggleOpen);
toggleOpenNode.classList.toggle(this.options.classActiveTrigger);
if (leftNavContainer.getAttribute('aria-expanded') === 'false') leftNavContainer.setAttribute('aria-expanded', 'true');
else leftNavContainer.setAttribute('aria-expanded', 'false');
}
/**
* Adds a transitional animation to the navSection
*/
animateNavSection(selectedNav) {
const selectedNavValue = selectedNav.dataset.leftNavSection;
const selectedNavLink = selectedNav.querySelector(this.options.selectorLeftNavSectionLink);
const leftNav = this.element.querySelector(this.options.selectorLeftNav);
const leftNavSections = this.element.querySelector(this.options.selectorLeftNavSections);
selectedNav.classList.remove(this.options.classNavSection);
selectedNav.classList.remove(`${this.options.classNavSection}--${selectedNavValue}`);
selectedNav.classList.add(this.options.classNavSectionTransition);
if (leftNavSections.children[0] === selectedNav) {
selectedNav.classList.add(`${this.options.classNavSectionTransition}--50`); // First child only move 50px
} else {
selectedNav.classList.add(`${this.options.classNavSectionTransition}--100`); // Second move 100px
}
selectedNav.setAttribute('data-left-nav-section', selectedNavValue);
/* Not sure what trick more performant */
setTimeout(() => {
selectedNav.classList.add(`${this.options.classNavSectionTransition}--0`);
}, 100); // Could probably use a promise here
selectedNavLink.classList.remove(this.options.classNavSectionLink);
selectedNavLink.classList.add(this.options.classNavHeaderTitle);
selectedNavLink.setAttribute('data-left-nav-current-section-title', '');
selectedNavLink.removeAttribute('data-left-nav-section-link');
this.element.insertBefore(selectedNav, leftNav);
}
/**
* Adds a transitional animation to the navigation items on nav section click
*/
animateNavList(selectedNavTitle) {
const currentLeftNavList = this.element.querySelector(
`${this.options.selectorLeftNavList}:not(${this.options.selectorLeftNavMainNavHidden})`
);
const newLeftNavList = this.element.querySelector(`[data-left-nav-list=${selectedNavTitle}]`);
const currentLeftNavItems = [...currentLeftNavList.querySelectorAll(this.options.selectorLeftNavListItem)].reverse();
const newLeftNavItems = [...newLeftNavList.querySelectorAll(this.options.selectorLeftNavListItem)];
const fadeOutTime = 300;
let counter = 0;
const counterIteration = fadeOutTime / currentLeftNavItems.length; // Length of animation divided by number of items
currentLeftNavItems.forEach(item => {
item.setAttribute('tabIndex', '-1');
setTimeout(() => {
item.classList.add(this.options.classItemFade);
}, counter);
counter += counterIteration;
});
newLeftNavItems.forEach(item => {
item.setAttribute('tabIndex', '0');
item.classList.remove(this.options.classItemFade);
});
setTimeout(() => {
currentLeftNavList.classList.add(this.options.classListHidden);
currentLeftNavList.classList.add(this.options.classListTop);
currentLeftNavList.setAttribute('aria-hidden', 'true');
newLeftNavList.classList.remove(this.options.classListHidden);
setTimeout(() => {
newLeftNavList.classList.remove(this.options.classListTop);
}, 100);
newLeftNavList.setAttribute('aria-hidden', 'false');
}, fadeOutTime + 100); // Wait for items to fade out.
}
hookOpenActions() {
const openBtn = this.element.ownerDocument.querySelector(this.options.selectorLeftNavToggleOpen);
const closeBtn = this.element.ownerDocument.querySelector(this.options.selectorLeftNavToggleClose);
this.manage(
on(openBtn, 'click', () => {
this.element.tabIndex = '0';
this.toggleMenu();
})
);
this.manage(
on(openBtn, 'keydown', evt => {
if (evt.which === 13) {
this.element.tabIndex = '0';
this.toggleMenu();
}
})
);
if (closeBtn) {
this.manage(
on(closeBtn, 'click', () => {
this.element.tabIndex = '-1';
this.closeMenu();
})
);
this.manage(
on(closeBtn, 'keydown', evt => {
if (evt.which === 13) {
this.element.tabIndex = '-1';
this.closeMenu();
}
})
);
}
this.manage(
on(this.element.ownerDocument, 'keydown', evt => {
if (evt.which === 27 && this.element.classList.contains(this.options.classActiveLeftNav)) {
this.closeMenu();
}
})
);
}
/**
* Addes Event listeners to list sections
*/
hookListSectionEvents() {
const leftNavSections = this.element.querySelector(this.options.selectorLeftNavSections);
this.manage(
on(leftNavSections, 'click', evt => {
this.handleSectionItemClick(evt, leftNavSections);
})
);
this.manage(
on(leftNavSections, 'keydown', evt => {
if (evt.which === 13) {
this.handleSectionItemClick(evt, leftNavSections);
this.element.querySelector(this.options.selectorLeftNavCurrentSectionTitle).focus();
}
})
);
}
/**
* Adds event listeners to list items
*/
hookListItemsEvents() {
const leftNavList = [...this.element.querySelectorAll(this.options.selectorLeftNavList)];
leftNavList.forEach(list => {
this.manage(
on(list, 'click', evt => {
const leftNavItem = eventMatches(evt, this.options.selectorLeftNavListItem);
if (leftNavItem) {
const childItem = eventMatches(evt, this.options.selectorLeftNavNestedListItem);
const hasChildren = eventMatches(evt, this.options.selectorLeftNavListItemHasChildren);
const flyoutItem = eventMatches(evt, this.options.selectorLeftNavFlyoutItem);
if (flyoutItem) {
this.addActiveListItem(flyoutItem);
} else if (childItem) {
if (childItem.querySelector(this.options.selectorLeftNavFlyoutMenu)) {
const flyoutMenu = childItem.querySelector(this.options.selectorLeftNavFlyoutMenu);
flyoutMenu.classList.toggle(this.options.classFlyoutDisplayed);
} else {
this.addActiveListItem(childItem);
}
} else if (hasChildren) {
this.handleNestedListClick(leftNavItem);
} else {
this.addActiveListItem(leftNavItem);
}
}
})
);
this.manage(
on(list, 'keydown', evt => {
if (evt.which === 13) {
const leftNavItem = eventMatches(evt, this.options.selectorLeftNavListItem);
if (leftNavItem) {
const childItem = eventMatches(evt, this.options.selectorLeftNavNestedListItem);
const hasChildren = eventMatches(evt, this.options.selectorLeftNavListItemHasChildren);
const flyoutItem = eventMatches(evt, this.options.selectorLeftNavFlyoutItem);
const hasLinkItem = !(leftNavItem.querySelector(this.options.selectorLeftNavListItemLink) === undefined);
if (flyoutItem) {
this.addActiveListItem(flyoutItem);
} else if (childItem) {
if (!childItem.querySelector(this.options.selectorLeftNavFlyoutMenu)) {
this.addActiveListItem(childItem);
} else {
childItem.querySelector(this.options.selectorLeftNavFlyoutMenu).setAttribute('aria-hidden', 'false');
childItem.querySelector(this.options.selectorLeftNavFlyoutMenu).style.top = `${childItem.offsetTop -
this.element.querySelector(this.options.selectorLeftNav).scrollTop}px`;
childItem.querySelector(this.options.selectorLeftNavFlyoutMenu).style.left = `${childItem.offsetLeft +
Math.round(childItem.offsetWidth)}px`;
}
} else if (hasChildren) {
this.handleNestedListClick(leftNavItem);
} else if (hasLinkItem) {
const link = leftNavItem.querySelector(this.options.selectorLeftNavListItemLink);
link.click();
} else {
this.addActiveListItem(leftNavItem);
}
}
}
})
);
});
const flyouts = [...this.element.ownerDocument.querySelectorAll(this.options.selectorLeftNavListItemHasFlyout)];
flyouts.forEach(flyout => {
this.manage(
on(flyout, 'mouseenter', () => {
flyout.querySelector(this.options.selectorLeftNavFlyoutMenu).setAttribute('aria-hidden', 'false');
// eslint-disable-next-line no-param-reassign
flyout.querySelector(this.options.selectorLeftNavFlyoutMenu).style.top = `${flyout.offsetTop -
this.element.querySelector(this.options.selectorLeftNav).scrollTop}px`;
// eslint-disable-next-line no-param-reassign
flyout.querySelector(this.options.selectorLeftNavFlyoutMenu).style.left = `${flyout.offsetLeft +
Math.round(flyout.offsetWidth)}px`;
flyout.querySelector(this.options.selectorLeftNavFlyoutMenu).classList.toggle(this.options.classFlyoutDisplayed);
})
);
this.manage(
on(flyout, 'mouseleave', () => {
flyout.querySelector(this.options.selectorLeftNavFlyoutMenu).setAttribute('aria-hidden', 'true');
flyout.querySelector(this.options.selectorLeftNavFlyoutMenu).classList.remove(this.options.classFlyoutDisplayed);
})
);
});
}
/**
* Hides all flyout menus.
*/
hideAllFlyoutMenus() {
const flyoutMenus = [...this.element.querySelectorAll(this.options.selectorLeftNavFlyoutMenu)];
flyoutMenus.forEach(menu => {
menu.setAttribute('aria-hidden', 'true');
menu.classList.remove(this.options.classFlyoutDisplayed);
});
}
/**
* Sets a list item as active.
* @param {Object} item The active list item.
*/
addActiveListItem(item) {
[...this.element.querySelectorAll(this.options.selectorLeftNavAllListItems)].forEach(currentItem => {
if (!(item === currentItem)) {
if (!currentItem.contains(item)) {
currentItem.classList.remove(this.options.classActiveLeftNavListItem);
} else {
currentItem.classList.add(this.options.classActiveLeftNavListItem);
}
}
});
[...this.element.querySelectorAll(this.options.selectorLeftNavNestedListItem)].forEach(currentItem => {
if (!(item === currentItem)) {
currentItem.classList.remove(this.options.classActiveLeftNavListItem);
}
});
item.classList.add(this.options.classActiveLeftNavListItem);
this.closeMenu();
this.hideAllFlyoutMenus();
this.closeMenu();
}
/**
* Handles click on the document.
* Closes the left navigation when document is clicked outside the left navigation.
* @param {Event} evt The event triggering this method.
*/
handleDocumentClick(evt) {
const clickTarget = evt.target;
const isOfSelf = this.element.contains(clickTarget);
const isToggleBtn = this.element.ownerDocument.querySelector(this.options.selectorLeftNavToggleOpen).contains(clickTarget);
const isOpen = this.element.classList.contains(this.options.classActiveLeftNav);
const isUnifiedHeader = this.element.ownerDocument.querySelector('[data-unified-header]').contains(clickTarget);
const shouldClose = !isOfSelf && isOpen && !isToggleBtn && !isUnifiedHeader;
let flyoutOpen;
if (this.element.querySelector(this.options.selectorLeftNavFlyoutMenu)) {
const leftnavFlyoutMenu = this.element.querySelector(this.options.selectorLeftNavFlyoutMenu);
flyoutOpen = leftnavFlyoutMenu.classList.contains(this.options.classFlyoutDisplayed);
}
if (isOfSelf && this.element.tagName === 'A') {
evt.preventDefault();
}
if (shouldClose) {
this.closeMenu();
}
if (this.element.querySelector(this.options.selectorLeftNavFlyoutMenu)) {
if (flyoutOpen && !isOfSelf && isOpen) {
this.element.querySelector(this.options.selectorLeftNavFlyoutMenu).classList.remove(this.options.classFlyoutDisplayed);
}
}
}
/**
* Handles click on a list item that contains a nested list in the left navigation.
* It hides all flyout menus and switches the tab-index on the list items based on whether or not the list is expanded.
* @param {HTMLElement} listItem The list item that was clicked.
*/
handleNestedListClick(listItem) {
const isOpen = listItem.classList.contains(this.options.classExpandedLeftNavListItem);
this.hideAllFlyoutMenus();
listItem.classList.toggle(this.options.classExpandedLeftNavListItem, !isOpen);
const listItems = [...listItem.querySelectorAll(this.options.selectorLeftNavNestedListItem)];
listItems.forEach(item => {
if (isOpen) {
listItem.querySelector(this.options.selectorLeftNavNestedList).setAttribute('aria-hidden', 'true');
// eslint-disable-next-line no-param-reassign
item.querySelector(this.options.selectorLeftNavListItemLink).tabIndex = -1;
} else {
listItem.querySelector(this.options.selectorLeftNavNestedList).setAttribute('aria-hidden', 'false');
// eslint-disable-next-line no-param-reassign
item.querySelector(this.options.selectorLeftNavListItemLink).tabIndex = 0;
}
});
}
handleSectionItemClick(evt, leftNavSections) {
// Sorry
const leftNavSectionItem = eventMatches(evt, this.options.selectorLeftNavSection);
if (leftNavSectionItem) {
// currently selected
const selectedLeftNavSectionItem = this.element.querySelector(this.options.selectorLeftNavCurrentSection);
const selectedLeftNavSectionItemTitle = selectedLeftNavSectionItem.querySelector(
this.options.selectorLeftNavCurrentSectionTitle
);
const selectedLeftNavSectionItemIcon = this.element.querySelector(this.options.selectorLeftNavCurrentSectionIcon);
const selectedLeftNavSectionItemUse = selectedLeftNavSectionItemIcon.querySelector('use');
const selectedLeftNavSectionValue = selectedLeftNavSectionItem.dataset.leftNavCurrentSection;
// clicked on item
const leftNavSectionItemLink = leftNavSectionItem.querySelector(this.options.selectorLeftNavSectionLink);
const leftNavSectionItemIcon = leftNavSectionItem.querySelector(this.options.selectorLeftNavSectionIcon);
const leftNavSectionItemIconUse = leftNavSectionItemIcon.querySelector('use');
const leftNavSectionValue = leftNavSectionItem.dataset.leftNavSection;
if (this.leftNavSectionActive) {
return;
}
this.leftNavSectionActive = true;
const newLeftNavSectionItem = document.createElement('li');
newLeftNavSectionItem.setAttribute('data-left-nav-section', selectedLeftNavSectionValue);
newLeftNavSectionItem.classList.add(this.options.classNavSection);
newLeftNavSectionItem.classList.add(`${this.options.classNavSection}--${selectedLeftNavSectionValue}`);
const newLeftNavSectionItemAnchor = document.createElement('a');
newLeftNavSectionItemAnchor.setAttribute('href', 'javascript:void(0)'); // eslint-disable-line no-script-url
newLeftNavSectionItemAnchor.setAttribute('tabindex', 0);
newLeftNavSectionItemAnchor.classList.add(this.options.classNavSectionAnchor);
const newLeftNavSectionItemIcon = selectedLeftNavSectionItemIcon.cloneNode(true);
// IE11 doesn't support classList on SVG, must revert to className
newLeftNavSectionItemIcon.setAttribute('class', this.options.classTaxonomyIcon);
newLeftNavSectionItemIcon.removeAttribute('data-left-nav-current-section-icon');
newLeftNavSectionItemIcon.setAttribute('data-left-nav-section-icon', selectedLeftNavSectionValue);
const newLeftNavSectionItemLink = document.createElement('span');
newLeftNavSectionItemLink.setAttribute('data-left-nav-section-link', '');
newLeftNavSectionItemLink.classList.add(this.options.classNavSectionLink);
newLeftNavSectionItemLink.textContent = selectedLeftNavSectionItemTitle.textContent;
this.animateNavSection(leftNavSectionItem);
this.animateNavList(leftNavSectionValue);
newLeftNavSectionItemAnchor.appendChild(newLeftNavSectionItemIcon);
newLeftNavSectionItemAnchor.appendChild(newLeftNavSectionItemLink);
newLeftNavSectionItem.appendChild(newLeftNavSectionItemAnchor);
leftNavSections.insertBefore(newLeftNavSectionItem, leftNavSections.firstChild);
setTimeout(() => {
selectedLeftNavSectionItemTitle.textContent = leftNavSectionItemLink.textContent;
selectedLeftNavSectionItem.setAttribute('data-left-nav-current-section', leftNavSectionValue);
selectedLeftNavSectionItemIcon.setAttribute('data-left-nav-current-section-icon', leftNavSectionValue);
selectedLeftNavSectionItemUse.setAttribute('xlink:href', leftNavSectionItemIconUse.getAttribute('xlink:href'));
leftNavSectionItem.parentNode.removeChild(leftNavSectionItem); // Cant use .remove() because of IE11
this.leftNavSectionActive = false;
}, 450); // Wait for nav items to animate
}
}
/**
* The component options.
* If `options` is specified in the constructor, {@linkcode LeftNav.create .create()}, or {@linkcode LeftNav.init .init()},
* properties in this object are overriden for the instance being create and how {@linkcode LeftNav.init .init()} works.
* @member LeftNav.options
* @type {Object}
* @property {string} selectorInit The CSS selector to find left nav containers.
* @property {string} [selectorLeftNav] The data attribute selector for the nav element in the left nav container.
* @property {string} [selectorLeftNavList] The data attribute selector for the main ul element in the left nav.
* @property {string} [selectorLeftNavNestedList] The data attribute selector for the nested ul elements in the left nav.
* @property {string} [selectorLeftNavToggle]
* The data attribute selector for the button that will show and hide the left navigation.
* @property {string} [selectorLeftNavListItem] The data attribute selector for all list items in the left navigation.
* @property {string} [selectorLeftNavNestedListItem]
* The data attribute selector for all nested list items in the left navigation.
* @property {string} [selectorLeftNavArrowIcon] The data attribute selector for the arrow icons in the left nav.
* @property {string} [selectorLeftNavFlyoutMenu] The data attribute selector for the flyout menus in the left nav.
* @property {string} [selectorLeftNavFlyoutItem] The data attribute selector for the flyout menu items in the left nav.
* @property {string} [selectorLeftNavSection] The data attribute selector for the three sections in the header of the left nav.
* @property {string} [selectorLeftNavCurrentPage]
* The data attribute selector for the current section title in the left nav header.
* @property {string} [selectorLeftNavMainNavHidden] The CSS selector for the hidden main nav.
* @property {string} [classActiveLeftNav] The class name for when a left nav is active.
* @property {string} [classActiveLeftNavListItem] The class name for when a left nav list item is active.
* @property {string} [classExpandedLeftNavListItem] The class name for when a nested list is expanded.
* @property {string} [classFlyoutDisplayed] The class name for when a flyout menu is displayed.
* @property {string} [classActiveSection] The class name for an active section item in the left nav header.
* @property {string} [classItemHasChildren] The class name for when a list item has children.
* @property {string} [classTaxonomyIcon] The class name for the taxonomy icon.
*/
static get options() {
const { prefix } = settings;
return {
selectorInit: '[data-left-nav-container]',
// Data Attribute selectors
selectorLeftNav: '[data-left-nav]',
selectorLeftNavList: '[data-left-nav-list]',
selectorLeftNavNestedList: '[data-left-nav-nested-list]',
selectorLeftNavToggleOpen: '[data-left-nav-toggle="open"]',
selectorLeftNavToggleClose: '[data-left-nav-toggle="close"]',
selectorLeftNavListItem: '[data-left-nav-item]',
selectorLeftNavListItemLink: '[data-left-nav-item-link]',
selectorLeftNavNestedListItem: '[data-left-nav-nested-item]',
selectorLeftNavArrowIcon: '[data-left-nav-icon]',
selectorLeftNavFlyoutMenu: '[data-left-nav-flyout]',
selectorLeftNavFlyoutItem: '[data-left-nav-flyout-item]',
selectorLeftNavSections: '[data-left-nav-sections]',
selectorLeftNavSection: '[data-left-nav-section]',
selectorLeftNavSectionLink: '[data-left-nav-section-link]',
selectorLeftNavSectionIcon: '[data-left-nav-section-icon]',
selectorLeftNavCurrentSection: '[data-left-nav-current-section]',
selectorLeftNavCurrentSectionTitle: '[data-left-nav-current-section-title]',
selectorLeftNavCurrentSectionIcon: '[data-left-nav-current-section-icon]',
selectorLeftNavListItemHasChildren: '[data-left-nav-item-with-children]',
selectorLeftNavListItemHasFlyout: '[data-left-nav-has-flyout]',
selectorLeftNavAllListItems: '[data-left-nav-item], [data-left-nav-nested-item], [data-left-nav-flyout-item]',
selectorLeftNavMainNavHidden: `.${prefix}--left-nav__main-nav--hidden`,
// CSS Class Selectors
classActiveTrigger: `${prefix}--left-nav__trigger--active`,
classActiveLeftNav: `${prefix}--left-nav--active`,
classActiveLeftNavListItem: `${prefix}--active-list-item`,
classExpandedLeftNavListItem: `${prefix}--main-nav__parent-item--expanded`,
classFlyoutDisplayed: `${prefix}--nested-list__flyout-menu--displayed`,
classItemHasChildren: `${prefix}--main-nav__parent-item--has-children`,
classNavSection: `${prefix}--left-nav__section`,
classNavSectionTransition: `${prefix}--left-nav__section--transition`,
classNavSectionAnchor: `${prefix}--left-nav__section--anchor`,
classNavSectionLink: `${prefix}--left-nav__section--link`,
classNavHeaderTitle: `${prefix}--left-nav__header--title`,
classItemFade: `${prefix}--main-nav__parent-item--fade`,
classItemHidden: `${prefix}--main-nav__parent-item--hidden`,
classListHidden: `${prefix}--left-nav__main-nav--hidden`,
classListTop: `${prefix}--left-nav__main-nav--top`,
classTaxonomyIcon: `${prefix}--left-nav__section--taxonomy-icon`,
};
}
/**
* The map associating DOM element and left navigation instance.
* @member LeftNav.components
* @type {WeakMap}
*/
static components = new WeakMap();
}
export default LeftNav;