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/** |
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* WPSubsAccordion — expand/collapse sections. |
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* |
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* Markup: |
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* <div class="wpsubs-accordion" data-multi="1"> |
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* <div class="wpsubs-accordion__item"> |
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* <button class="wpsubs-accordion__header" aria-controls="a1" aria-expanded="false">Title</button> |
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* <div class="wpsubs-accordion__panel" id="a1" hidden>…</div> |
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* </div> |
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* </div> |
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* |
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* data-multi (truthy) allows multiple panels open at once; default is |
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* single-open (opening one collapses the others). A header with |
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* aria-expanded="true" starts open. |
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* |
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* Events fired on the root element (bubbles): |
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* wpsubs:accordion:toggle — { id, open } |
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*/ |
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(function () { |
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"use strict"; |
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|
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/** |
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* @param {HTMLElement} el Root .wpsubs-accordion element. |
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*/ |
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function WPSubsAccordion(el) { |
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this.el = el; |
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this.multi = !!el.dataset.multi; |
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this.headers = Array.prototype.slice.call(el.querySelectorAll(".wpsubs-accordion__header")); |
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this._bind(); |
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|
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// Sync initial panel visibility to each header's aria-expanded. |
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var self = this; |
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this.headers.forEach(function (header) { |
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var panel = self._panel(header); |
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if (panel) panel.hidden = header.getAttribute("aria-expanded") !== "true"; |
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}); |
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} |
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|
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WPSubsAccordion.prototype._panel = function (header) { |
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if (!header) return null; |
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var id = header.getAttribute("aria-controls"); |
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return id ? this.el.querySelector("#" + id) : null; |
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}; |
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|
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/** |
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* Open or close one section. |
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* |
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* @param {HTMLElement} header Section header button. |
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* @param {boolean} open Desired state. |
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*/ |
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WPSubsAccordion.prototype.set = function (header, open) { |
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var panel = this._panel(header); |
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header.setAttribute("aria-expanded", open ? "true" : "false"); |
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if (panel) panel.hidden = !open; |
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|
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// Single-open mode: collapse every other section when opening this one. |
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if (open && !this.multi) { |
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var self = this; |
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this.headers.forEach(function (other) { |
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if (other !== header) self.set(other, false); |
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}); |
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} |
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|
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this.el.dispatchEvent( |
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new CustomEvent("wpsubs:accordion:toggle", { |
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bubbles: true, |
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detail: { id: header.getAttribute("aria-controls") || "", open: open }, |
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}), |
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); |
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}; |
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|
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WPSubsAccordion.prototype._bind = function () { |
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var self = this; |
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this.headers.forEach(function (header) { |
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header.addEventListener("click", function (e) { |
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e.preventDefault(); |
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self.set(header, header.getAttribute("aria-expanded") !== "true"); |
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}); |
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}); |
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}; |
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|
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/** |
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* Initialise all un-initialised .wpsubs-accordion elements under root. |
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* |
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* @param {Document|HTMLElement} [root] |
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*/ |
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function init(root) { |
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(root || document).querySelectorAll(".wpsubs-accordion:not([data-accordion-init])").forEach(function (el) { |
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el.setAttribute("data-accordion-init", "1"); |
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new WPSubsAccordion(el); |
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}); |
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} |
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|
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if (document.readyState === "loading") { |
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document.addEventListener("DOMContentLoaded", function () { |
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init(); |
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}); |
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} else { |
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init(); |
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} |
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|
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// Public API |
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window.WPSubsAccordion = { init: init }; |
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})(); |
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|
