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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,165 +1,126 @@ | ||
| (function () { | ||
| function Accordion(element) { | ||
| let thisAccordion = this; | ||
|
|
||
| // Get the accordions, and if the accordion group is multiselectable. | ||
| this.accordions = element.getElementsByClassName("accordion__heading"); | ||
| this.multiSelectible = element.getAttribute('aria-multiselectable') === 'true' || false; | ||
|
|
||
| // For each of the accordions... | ||
| for (let i = 0; i < this.accordions.length; i++) { | ||
|
|
||
| // Get the accordion item's components. | ||
| let itemComponents = this.accordionItemComponents(this.accordions[i]); | ||
|
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| // Check if the accordion is currently expanded at moment of click. | ||
| let expanded = this.isAccordionOpen(itemComponents.btn); | ||
|
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| // If it is, un-hide its corresponding panel. | ||
| itemComponents.panel.hidden = !expanded; | ||
|
|
||
| // When the accordion's button is clicked... | ||
| itemComponents.btn.onclick = () => { | ||
|
|
||
| // Toggle the corresponding accordion. | ||
| this.toggleAccordion(this.accordions[i]); | ||
| } | ||
| } | ||
|
|
||
| // Add a listener that listens for when the URL is changed. | ||
| window.addEventListener('popstate', function (event) { | ||
|
|
||
| // Activate an accordion based upon the hash parameters in the URL. | ||
| thisAccordion.activateAccordionByHash(); | ||
| /** | ||
| * A class for controlling accordion behavior. | ||
| */ | ||
| class Accordion { | ||
| constructor(element) { | ||
|
|
||
| // Loop through each accordion item and add a listener for when the accordion is toggled. | ||
| const accordionItems = element.querySelectorAll('details'); | ||
| Array.prototype.forEach.call(accordionItems, (item) => { | ||
| // Add a listener for when the details element is toggled. | ||
| item.addEventListener('toggle', (event) => { | ||
| this.toggleAccordionItem(item, event.newState === 'open'); | ||
| }); | ||
|
|
||
| // Add a listener for when the summary element is clicked. | ||
| const summary = item.querySelector('summary'); | ||
| summary.addEventListener('click', (event) => { | ||
| this.accordionItemClick(item); | ||
| }); | ||
| }); | ||
|
|
||
| // Activate any accordion that is defined in the hash parameter if there is one. | ||
| this.activateAccordionByHash(); | ||
| } | ||
|
|
||
| // Gets the item components for 'accordion'. | ||
| // Returns an object that contains 'btn' and 'panel' elements. | ||
| Accordion.prototype.accordionItemComponents = function (accordion) { | ||
| let btn = accordion.querySelector('button'); | ||
| let panel = accordion.nextElementSibling; | ||
|
|
||
| return { | ||
| 'btn': btn, | ||
| 'panel': panel | ||
| } | ||
| } | ||
|
|
||
| // Define whether 'accordion' is open with 'isOpen'. | ||
| Accordion.prototype.accordionOpen = function (accordion, isOpen) { | ||
| // Get the accordion item's components. | ||
| let itemComponents = this.accordionItemComponents(accordion); | ||
|
|
||
| // Set the relevant attributes for 'accordion' based on 'isOpen'. | ||
| itemComponents.btn.setAttribute('aria-expanded', isOpen); | ||
| itemComponents.btn.setAttribute('aria-selected', isOpen); | ||
| itemComponents.panel.hidden = !isOpen; | ||
| /** | ||
| * Handles the click event for an accordion summary element. | ||
| * | ||
| * @param accordionItem | ||
| * The details element of an accordion item. | ||
| */ | ||
| accordionItemClick(accordionItem) { | ||
|
|
||
| // Adds a bespoke data attribute to the accordion item | ||
| // so that we can determine if it was clicked. This is | ||
| // necessary because the 'click' event if fired before | ||
| // the 'toggle' event and we don't know if the accordion | ||
| // item is being opened or closed yet. | ||
| accordionItem.setAttribute('data-accordion-clicked', true); | ||
| } | ||
|
|
||
| // Activate an 'accordion'. | ||
| Accordion.prototype.activateAccordion = function (accordion) { | ||
|
|
||
| // Checks if multiple accordions can be open at once. If not, closes other accordions. | ||
| if (!this.multiSelectible) { | ||
| this.collapseAllAccordions(); | ||
| /** | ||
| * Handles the toggle event of an accordion details element. | ||
| * | ||
| * @param accordionItem | ||
| * The details element of an accordion item. | ||
| * @param isOpening | ||
| * A boolean value indicating the new toggle state. | ||
| */ | ||
| toggleAccordionItem(accordionItem, isOpening) { | ||
|
|
||
| // Set the relevant attributes for 'accordion' based on 'open'. | ||
| accordionItem.setAttribute('aria-expanded', isOpening); | ||
| accordionItem.setAttribute('aria-selected', isOpening); | ||
|
|
||
| // Check if the accordion was clicked. | ||
| const clicked = accordionItem.getAttribute('data-accordion-clicked'); | ||
| if (clicked) { | ||
| accordionItem.removeAttribute('data-accordion-clicked'); | ||
|
|
||
| // If the accordion is not open (but will be)... | ||
| if (isOpening) { | ||
| // Define historyString here to be used later. | ||
| const historyString = '#' + accordionItem.id; | ||
|
|
||
| // Change window location to add URL params | ||
| if (window.history && history.pushState && historyString !== '#') { | ||
| // NOTE: doesn't take into account existing params | ||
| history.replaceState("", "", historyString); | ||
| } | ||
| } | ||
| // Else if the accordion is closed... | ||
| else { | ||
| // Empty the history string. | ||
| history.replaceState("", "", null); | ||
| } | ||
| } | ||
|
|
||
| // Open the accordion. | ||
| this.accordionOpen(accordion, true); | ||
| } | ||
|
|
||
| // Activate any accordion that is defined in the hash parameter if there is one. | ||
| Accordion.prototype.activateAccordionByHash = function () { | ||
| /** | ||
| * Opens an accordion based on the hash in the URL. | ||
| */ | ||
| static focusAccordionItemByHash() { | ||
|
|
||
| // Get the hash parameter. | ||
| let hash = window.location.hash.substr(1); | ||
| const hash = window.location.hash.substr(1); | ||
|
|
||
| // If the hash parameter is not empty... | ||
| if (hash !== '') { | ||
|
|
||
| // Get the accordion to focus. | ||
| let accordionToFocus = document.getElementById(hash); | ||
| const hashedAccordionItem = document.getElementById(hash); | ||
|
|
||
| // If the defined hash parameter finds an element... | ||
| if (accordionToFocus !== null) { | ||
|
|
||
| // Get the accordion wrapper of the hash parameter and this accordion wrapper to compare later. | ||
| let accordionToFocusAccordionWrapper = accordionToFocus.parentElement | ||
| let accordionWrapper = this.accordions[0].parentElement; | ||
|
|
||
| // If the accordion wrapper defined by the hash and this accordion wrapper are the same... | ||
| if (accordionToFocusAccordionWrapper === accordionWrapper) { | ||
|
|
||
| // Activate the accordion defined in the hash parameters. | ||
| this.activateAccordion(accordionToFocus); | ||
| if (hashedAccordionItem !== null) { | ||
| // If the summary element is present... | ||
| const summary = hashedAccordionItem.querySelector('summary'); | ||
| if (summary) { | ||
| // Trigger click event for summary. | ||
| summary.click(); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Initializes the accordion on each of the specified selectors. | ||
| * | ||
| * @param selector | ||
| */ | ||
| function applyAccordion(selector) { | ||
| const items = document.querySelectorAll(selector); | ||
|
|
||
| Array.prototype.forEach.call(items, (item) => { | ||
| new Accordion(item); | ||
| }); | ||
|
|
||
| // Add a listener that listens for when the URL is changed. | ||
| window.addEventListener('popstate', (event) => { | ||
| // Activate an accordion based upon the hash parameters in the URL. | ||
| Accordion.focusAccordionItemByHash(); | ||
| }); | ||
|
|
||
| // Collapse all accordions in this accordion group. | ||
| Accordion.prototype.collapseAllAccordions = function () { | ||
|
|
||
| // For each accordion... | ||
| for (let i = 0; i < this.accordions.length; i++) { | ||
|
|
||
| // Close it. | ||
| this.accordionOpen(this.accordions[i], false); | ||
| } | ||
| } | ||
|
|
||
| // Check if an accordion is open by inspecting the aria attribute of the 'btn' controlling it. | ||
| // Returns a boolean. | ||
| Accordion.prototype.isAccordionOpen = function (btn) { | ||
| return btn.getAttribute('aria-expanded') === 'true' || false; | ||
| } | ||
|
|
||
| // Toggle a specific 'accordion' open or closed. | ||
| Accordion.prototype.toggleAccordion = function (accordion) { | ||
| // Get the accordion's button element. | ||
| let btn = accordion.querySelector('button'); | ||
|
|
||
| // Check if the accordion is currently expanded at moment of click. | ||
| let expanded = this.isAccordionOpen(btn); | ||
|
|
||
| // Checks if multiple accordions can be open at once. If not, closes other accordions. | ||
| if (!this.multiSelectible && !expanded) { | ||
| this.collapseAllAccordions(); | ||
| } | ||
|
|
||
| // Toggle the accordion. | ||
| this.accordionOpen(accordion, !expanded) | ||
|
|
||
| // If the accordion is not open (but will be)... | ||
| if (!expanded) { | ||
|
|
||
| // Define historyString here to be used later. | ||
| let historyString = '#' + btn.parentElement.id; | ||
|
|
||
| // Change window location to add URL params | ||
| if (window.history && history.pushState && historyString !== '#') { | ||
| // NOTE: doesn't take into account existing params | ||
| history.replaceState("", "", historyString); | ||
| } | ||
| } | ||
|
|
||
| // Else if the accordion is closed... | ||
| else { | ||
|
|
||
| // Empty the history string. | ||
| history.replaceState("", "", " "); | ||
| } | ||
| } | ||
|
|
||
| // Instantiate accordions on the page. | ||
| const accordions = document.getElementsByClassName("accordion"); | ||
| // Activate any accordion that is defined in the hash parameter if there is one. | ||
| Accordion.focusAccordionItemByHash(); | ||
| } | ||
|
|
||
| for (let i = 0; i < accordions.length; i++) { | ||
| let accordion = new Accordion(accordions[i]); | ||
| } | ||
| }()); | ||
| export { applyAccordion } | ||
|
|
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