Issue 4925 - Create accordion component for Help Center

static/js/main.js

 (function(){
   document.addEventListener("DOMContentLoaded", function()
   {
 
     // Change html class name from "no-js" to "js"
     document.documentElement.className = "js";
 
     // Toggle Navbar Collapse
     function toggleNavbarCollapse()
     {
       var navbarCollapseEls = this.parentElement.getElementsByClassName("navbar-collapse");
       for (var i = 0; i < navbarCollapseEls.length; i++)
       {
         navbarCollapseEls[i]
           .classList.toggle("open")
       }
     }
 
     var toggleNavbarCollapseEls = document.getElementsByClassName("toggle-navbar-collapse");
     for (var i = 0; i < toggleNavbarCollapseEls.length; i++)
     {
       toggleNavbarCollapseEls[i]
         .addEventListener("click", toggleNavbarCollapse, false);
     }
 
+    // Accordion menu
+
+    function setupAccordionMenu(accordionEl)
+    {
+      var accordionButtons = accordionEl.getElementsByClassName('accordion-toggle-button');
+      for ( var i = 0; i < accordionButtons.length; i++ ) {
+        accordionButtons[i].addEventListener("click", toggleAccordionSection, false);
+        if ( i !== 0 ) {
+          accordionButtons[i].setAttribute("aria-expanded", "false");
+          accordionButtons[i].setAttribute("aria-disabled", "false");
+          document
+            .getElementById( accordionButtons[i].getAttribute("aria-controls") )
+            .setAttribute("hidden", "true");

[ire, 2017/09/18 10:08:11]

See https://issues.adblockplus.org/ticket/5703 regarding use of the hidden
attribute

[juliandoucette, 2017/09/18 12:53:31]

Acknowledged.

+        }
+      }
+    }
+    
+    function toggleAccordionSection()
+    {
+      // Hide currently expanded section
+      var accordion = this.parentElement.parentElement;
+      var expandedButton = accordion.querySelector("button[aria-expanded='true']");
+      expandedButton.setAttribute("aria-expanded", "false");
+      expandedButton.setAttribute("aria-disabled", "false");
+      document
+        .getElementById( expandedButton.getAttribute("aria-controls") )
+        .setAttribute("hidden", "true");
+
+      // Expand new section
+      this.setAttribute("aria-expanded", "true");
+      this.setAttribute("aria-disabled", "true");
+      document
+        .getElementById( this.getAttribute("aria-controls") )
+        .removeAttribute("hidden");
+    }
+
+    var accordionMenus = document.getElementsByClassName('accordion');
+    for (var i = 0; i < accordionMenus.length; i++)
+    {
+      setupAccordionMenu( accordionMenus[i] );
+    }

[ire, 2017/09/18 10:08:11]

This will be refactored in https://issues.adblockplus.org/ticket/5652

[juliandoucette, 2017/09/18 12:53:31]

Acknowledged.

+
   }, false);
 }());