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Replace header nav logic and styles with popover equivalents
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,62 +1,65 @@ | ||
| // Headernav Component: | ||
| // Headernav Component // | ||
|
|
||
| const headerNav = document.querySelector('.js-headernav') | ||
| const subNavs = headerNav.querySelectorAll(':scope > ul > li:has(> ul)') | ||
| const headerNavMediaQuery = window.matchMedia('(min-width: 760px)') | ||
| let counter = 1 | ||
|
|
||
| function clickLink (event) { | ||
| if (this.parentElement.classList.contains('open') === false) { | ||
| this.parentElement.classList.add('open') | ||
| this.setAttribute('aria-expanded', 'true') | ||
| } else { | ||
| this.parentElement.classList.remove('open') | ||
| this.setAttribute('aria-expanded', 'false') | ||
| } | ||
| event.preventDefault() | ||
| } | ||
| if (document.querySelector('.c-headernav')) { | ||
| for (const subNav of subNavs) { | ||
| const subNavSiblingLink = subNav.querySelector('a') | ||
| const subNavPopover = subNav.querySelector('ul') | ||
| subNavPopover.popover = '' | ||
|
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||
| // Anchor each sibling link to its popover using unique anchor names: | ||
| const anchorName = '--anchor' + counter++ | ||
|
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| // The properties 'anchor-name' and 'position-anchor' can't be set using style.setProperty in browsers that don't support them. Instead, use setAttribute to force them to appear in so that the anchor positioning polyfill sees them: | ||
| subNavSiblingLink.setAttribute('style', 'anchor-name: ' + anchorName) | ||
| subNavPopover.setAttribute('style', 'position-anchor: ' + anchorName) | ||
|
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||
| const headerNavToggles = mq => { | ||
| const expandedState = () => { | ||
| if (subNavPopover.matches(':popover-open')) { | ||
| subNavSiblingLink.setAttribute('aria-expanded', 'true') | ||
| } else { | ||
| subNavSiblingLink.setAttribute('aria-expanded', 'false') | ||
| } | ||
| } | ||
|
|
||
| if (mq.matches) { | ||
| // Only a <button> as a popover control has built-in accessiblity bindings, so set and toggle sibling link aria expanded state: | ||
| subNavSiblingLink.setAttribute('aria-expanded', 'false') // initial state | ||
|
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||
| const headerNavToggles = e => { | ||
| if (document.querySelector('.c-headernav') && e.matches) { | ||
| const allMenuItems = document.querySelectorAll('.c-headernav > ul > li'); | ||
|
|
||
| [].forEach.call(allMenuItems, function (el) { | ||
| document.querySelector('.c-headernav').classList.remove('c-headernav-no-js') | ||
| document.querySelector('.c-headernav').classList.add('c-headernav-js') | ||
| el.querySelector('a').setAttribute('aria-haspopup', 'true') | ||
| el.querySelector('a').setAttribute('aria-expanded', 'false') | ||
|
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||
| el.addEventListener('mouseover', function (event) { | ||
| this.classList.add('open') | ||
| this.querySelector('a').setAttribute('aria-expanded', 'true') | ||
| }) | ||
|
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||
| el.addEventListener('mouseout', function (event) { | ||
| this.classList.remove('open') | ||
| this.querySelector('a').setAttribute('aria-expanded', 'false') | ||
| }) | ||
|
|
||
| el.querySelector('a').addEventListener('click', clickLink) | ||
| }); | ||
|
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||
| [].forEach.call(allMenuItems, function (el) { | ||
| el.querySelector('a').addEventListener('focus', function (event) { | ||
| [].forEach.call( | ||
| allMenuItems, | ||
| function (el) { | ||
| if (el !== this.parentElement) { | ||
| el.classList.remove('open') | ||
| el.querySelector('a').setAttribute('aria-expanded', 'false') | ||
| } | ||
| }, this | ||
| ) | ||
| }) | ||
| }) | ||
| } else { | ||
| const allMenuItems = document.querySelectorAll('.c-headernav > ul > li'); | ||
|
|
||
| [].forEach.call(allMenuItems, function (el) { | ||
| el.querySelector('a').removeEventListener('click', clickLink) | ||
| }) | ||
| // Show/hide subnav on mouse pointer over and out: | ||
| subNav.addEventListener('mouseover', () => { | ||
| subNavPopover.showPopover() | ||
| expandedState() | ||
| }) | ||
|
|
||
| subNav.addEventListener('mouseout', () => { | ||
| subNavPopover.hidePopover() | ||
| expandedState() | ||
| }) | ||
|
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||
| // Toggle subnav if sibling link is clicked by keyboard return key: | ||
| subNavSiblingLink.addEventListener('click', (e) => { | ||
| subNavPopover.togglePopover() | ||
| e.preventDefault() // disable link from going to its URL when clicked | ||
| expandedState() | ||
| }) | ||
|
|
||
| // Hide subnav when keyboard focus leaves its popover control: | ||
| subNav.addEventListener('focusout', (e) => { | ||
| if (!e.currentTarget.contains(e.relatedTarget)) { | ||
| subNavPopover.hidePopover() | ||
| expandedState() | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| headerNavMediaQuery.addEventListener('change', headerNavToggles) | ||
| headerNavToggles(headerNavMediaQuery) | ||
| } | ||
| } | ||
|
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||
| headerNavMediaQuery.addEventListener('change', headerNavToggles) | ||
| headerNavToggles(headerNavMediaQuery) |