Issue 5692 - Create Browser Selector with Browser Detection Component for help.eyeo.com

static/js/main.js

-(function(){
+(function()
+{
   document.addEventListener("DOMContentLoaded", function()
   {
 
+    /**************************************************************************
+     * General
+     **************************************************************************/
+
     // Change html class name from "no-js" to "js"
     document.documentElement.className = "js";
 
-    // Toggle Navbar Collapse
+    /**************************************************************************
+     * Navbar
+     **************************************************************************/
+
     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);
     }
 
-    // Custom Select
-    function onClickCustomSelect()
-    {
-      var options = this.nextElementSibling;
-      if (options.getAttribute("aria-hidden") == "true")
-      {
-        options.removeAttribute("aria-hidden");
-        this.setAttribute("aria-expanded", "true");
+    /**************************************************************************
+     * CustomSelect
+     **************************************************************************/
+
+    function CustomSelect(select)
+    {
+      this.select = select;
+      this.close();
+      this.select
+          .addEventListener("click", this._onClick.bind(this), false);
+      this.select
+          .addEventListener("focusout", this._onFocusOut.bind(this), false);
+    }
+
+    CustomSelect.prototype._onFocusOut = function()
+    {
+      // setTimeout to allow document.activeElement 
+      // to move to newly focused element
+      setTimeout(function()
+      {
+        var newFocus = document.activeElement;
+        
+        if (newFocus
+              .classList.contains("custom-select-selected") ||
+            newFocus
+              .classList.contains("custom-select-option") ||
+            newFocus
+              .parentElement
+              .classList.contains("custom-select-option"))
+        {
+          return;
+        }
+
+        this.close();
+        
+      }.bind(this), 1);
+    }
+
+    CustomSelect.prototype._onClick = function(event)
+    {
+      if (event.target.classList.contains("custom-select-selected"))
+      {
+        var options = this.select.querySelector(".custom-select-options");
+        if (options.getAttribute("aria-hidden") == "true")
+        {
+          this.open();
+        }
+        else
+        {
+          this.close();
+        }
+      }
+    }
+
+    CustomSelect.prototype.open = function()
+    {
+      this.select
+        .querySelector(".custom-select-selected")
+        .setAttribute("aria-expanded", "true");
+
+      this.select
+        .querySelector(".custom-select-options")
+        .removeAttribute("aria-hidden");
+    }
+
+    CustomSelect.prototype.close = function()
+    {
+      this.select
+        .querySelector(".custom-select-selected")
+        .setAttribute("aria-expanded", "false");
+
+    this.select
+        .querySelector(".custom-select-options")
+        .setAttribute("aria-hidden", "true");
+    }
+    
+    new CustomSelect(document.getElementById("language-select"));
+
+    /**************************************************************************
+     * Accordion
+     **************************************************************************/
+
+    function Accordion(accordion)
+    {
+      this.accordion = accordion;
+      
+      var accordionButtons = this.accordion.getElementsByClassName('accordion-toggle-button');
+      for (var i = 0; i < accordionButtons.length; i++)
+      {
+        // Close all sections except the first
+        if (i !== 0)
+        {
+          accordionButtons[i].setAttribute("aria-expanded", "false");
+          document
+            .getElementById( accordionButtons[i].getAttribute("aria-controls") )
+            .setAttribute("hidden", "true");
+        }
+      }
+
+      this.accordion
+        .addEventListener("click", this._onClick.bind(this), false);
+      this.accordion
+        .addEventListener("keydown", this._onKeyDown.bind(this), false);
+    }
+
+    Accordion.prototype.toggleSection = function(clickedButton)
+    {
+      // Hide currently expanded section
+      var expandedButton = this.accordion.querySelector("button[aria-expanded='true']");
+      if (expandedButton)
+      {
+        expandedButton.setAttribute("aria-expanded", "false");
+        document
+          .getElementById( expandedButton.getAttribute("aria-controls") )
+          .setAttribute("hidden", "true");
+      }
+
+      // If currently expanded section is clicked
+      if (expandedButton === clickedButton) return;
+
+      // Expand new section
+      clickedButton.setAttribute("aria-expanded", "true");
+      document
+        .getElementById( clickedButton.getAttribute("aria-controls") )
+        .removeAttribute("hidden");
+    }
+
+    Accordion.prototype.focusNextSection = function()
+    {
+      var currentFocus = document.activeElement;
+      var nextheading = currentFocus.parentElement.nextElementSibling.nextElementSibling;
+
+      if (nextheading)
+      {
+        nextheading // .accordion-heading
+          .firstElementChild // .accordion-toggle-button
+          .focus();
       }
       else
       {
-        options.setAttribute("aria-hidden", "true");
-        this.setAttribute("aria-expanded", "false");
-      }
-    }
-
-    var customSelectEls = document.getElementsByClassName('custom-select-selected');
-    for (var i = 0; i < customSelectEls.length; i++)
-    {
-      customSelectEls[i]
-        .addEventListener("click", onClickCustomSelect, false);
-      customSelectEls[i]
-        .nextElementSibling
-        .setAttribute("aria-hidden", "true");
-    }
-
-    // Browser Select
+        this.accordion
+          .firstElementChild // .accordion-heading
+          .firstElementChild // .accordion-toggle-button
+          .focus();
+      }
+    }
+
+    Accordion.prototype.focusPrevSection = function()
+    {
+      var currentFocus = document.activeElement;
+      var prevAccordionBody = currentFocus.parentElement.previousElementSibling;
+
+      if (prevAccordionBody)
+      {
+        prevAccordionBody // .accordion-body
+          .previousElementSibling // .accordion-heading
+          .firstElementChild // .accordion-toggle-button
+          .focus();
+      }
+      else
+      {
+        this.accordion
+          .lastElementChild // .accordion-body
+          .previousElementSibling // .accordion-heading
+          .firstElementChild // .accordion-toggle-button
+          .focus();
+      }
+    }
+
+    Accordion.prototype._onKeyDown = function(event)
+    {
+      if (!event.target.classList.contains("accordion-toggle-button")) return;
+
+      if (event.key == "ArrowUp" || event.keyCode == 38)
+      {
+        this.focusPrevSection();
+      }
+      else if (event.key == "ArrowDown" || event.keyCode == 40)
+      {
+        this.focusNextSection();
+      }
+    }
+
+    Accordion.prototype._onClick = function(event)
+    {
+      if (!event.target.classList.contains("accordion-toggle-button")) return;
+      
+      this.toggleSection(event.target);
+    }
+
+    var productTopicsAccordion = document.getElementById('product-topics-accordion');
+    if (productTopicsAccordion)
+    {
+      new Accordion(productTopicsAccordion);
+    }
+
+    /**************************************************************************
+     * BrowserSelect
+     **************************************************************************/
+
     function BrowserSelect(select)
     {
-      this.browserSelect = select;
-      
-      this.DEFAULT_BROWSER = "chrome";

[ire, 2017/09/29 12:09:18]

This is an arbitrary decision. We can change this based on browser usage
statistics and make this whatever is our most commonly used browser.

+      this.select = select;
+      CustomSelect.apply(this, [this.select]);
+      
       this.BROWSER_STORAGE_KEY = "BROWSER";
       this.BROWSER_AUTODETECTED_STORAGE_KEY = "BROWSER_AUTODETECTED";
-      
-      this.browserSelect
+      this.SUPPORTED_BROWSERS = ["chrome", "opera", "samsungBrowser", 
+                                 "yandexbrowser", "maxthon", "msie", 
+                                 "msedge", "firefox", "ios", "safari"];
+      this.DEFAULT_BROWSER = "chrome";
+      
+      this.select
         .addEventListener("click", this._onClickOrKeyDown.bind(this), false);
       
-      this.browserSelect
+      this.select
         .addEventListener("keydown", this._onClickOrKeyDown.bind(this), false);
 
       var storedBrowser = localStorage.getItem(this.BROWSER_STORAGE_KEY);
-      if (storedBrowser)
-      {
-        this.selectOption(storedBrowser);
-      }
-      else
-      {
-        this.detectBrowser();
-      }
-    }
+      if (storedBrowser) this.selectOption(storedBrowser);
+      else this.detectBrowser();
+    }
+
+    BrowserSelect.prototype = Object.create(CustomSelect.prototype);
+    BrowserSelect.prototype.constructor = BrowserSelect;
 
     BrowserSelect.prototype.detectBrowser = function()
     {
-      localStorage.setItem(this.BROWSER_AUTODETECTED_STORAGE_KEY, "true");
-
-      var browser;
-      if (bowser.chrome) browser = "chrome";

[ire, 2017/09/29 12:09:18]

I decided to go with bowser unless we have some other preferred way of detecting
browser

-      else if (bowser.opera) browser = "opera";
-      else if (bowser.coast) browser = "opera";
-      else if (bowser.samsungBrowser) browser = "samsung";
-      else if (bowser.yandexbrowser) browser = "yandex";
-      else if (bowser.maxthon) browser = "maxthon";
-      else if (bowser.msie) browser = "ie";
-      else if (bowser.msedge) browser = "edge";
-      else if (bowser.firefox) browser = "firefox";
-      else if (bowser.ios) browser = "ios";
-      else if (bowser.safari) browser = "safari";
-      else
-      {
-        localStorage.removeItem(this.BROWSER_AUTODETECTED_STORAGE_KEY);
-        browser = this.DEFAULT_BROWSER;
-      }
-
-      this.selectOption(browser);  
-    }
+      for (var i = 0; i < this.SUPPORTED_BROWSERS.length; i++)
+      {
+        var supportedBrowser = this.SUPPORTED_BROWSERS[i];
+        if (bowser[supportedBrowser])
+        {
+          localStorage.setItem(this.BROWSER_AUTODETECTED_STORAGE_KEY, "true");
+          return this.selectOption(supportedBrowser);
+        }
+      }
+
+      this.selectOption(this.DEFAULT_BROWSER);  
+    };
 
     BrowserSelect.prototype.selectOption = function(browser)
     {
-      // Save value to Local Storage
       localStorage.setItem(this.BROWSER_STORAGE_KEY, browser);
 
       // Change body class
-      document.body.className = "ua-"+browser;
+      var bodyClassList = Array.prototype.slice.call(document.body.classList);
+      for (var i = 0; i < bodyClassList.length; i++)
+      {
+        if (bodyClassList[i].indexOf('ua-') > -1)
+        {
+          document.body.classList.remove(bodyClassList[i]);
+        }
+      }
+      document.body.classList.add("ua-" + browser);
+
+      // Check selected option
+      var selectedItem = this.select
+                             .querySelector("[data-value='" + browser + "']");
+      selectedItem.setAttribute("aria-checked", "true");
 
       // Set selected option
-      var selectedOption = document.createElement('li');
-      selectedOption.innerHTML = this
-                                  .browserSelect
-                                  .querySelector("[data-value='"+browser+"']")
-                                  .innerHTML;
+      var selectedOption = selectedItem.innerHTML;
 
       if (localStorage.getItem(this.BROWSER_AUTODETECTED_STORAGE_KEY))
       {
-        selectedOption.innerHTML += "<span class='muted'>(autodetected)</span>";
-      }
-
-      this.browserSelect
-        .querySelector('.custom-select-selected')
-        .innerHTML = selectedOption.innerHTML;
-    }
+        var autodetected = document
+                              .getElementById('browser-select-autodetected')
+                              .innerHTML;
+        selectedOption += "<span class='muted'>(" + autodetected + ")</span>";
+      }
+
+      this.select
+          .querySelector(".custom-select-selected")
+          .innerHTML = selectedOption;
+    };
 
     BrowserSelect.prototype._onClickOrKeyDown = function(event)
     {
-      if (!event.target.classList.contains('custom-select-option')) return;
+      if (!event.target.classList.contains("custom-select-option")) return;
 
       var IS_ENTER_KEY = event.key == "Enter" || event.keyCode == 13;
       if (event.keyCode && !IS_ENTER_KEY) return;
 
       localStorage.removeItem(this.BROWSER_AUTODETECTED_STORAGE_KEY);
 
-      this.selectOption(event.target.getAttribute('data-value'));
-
-      // Close Select

[ire, 2017/09/29 12:09:17]

I think I should refactor the way the custom select was created so I can call a
"close" function instead of having to do it manually here.

I will create a separate issue for that then refactor this when that is done.

[ire, 2017/10/11 17:21:45]

Done.

-      document
-        .querySelector('#browser-select .custom-select-selected')
-        .setAttribute("aria-expanded", "false");
-  
-      document
-        .querySelector('#browser-select .custom-select-options')
-        .setAttribute("aria-hidden", "true");
-    }
-
-    var browserSelect = document.getElementById('browser-select');
+      // Uncheck previously checked option
+      this.select
+          .querySelector("[aria-checked='true']")
+          .setAttribute("aria-checked", "false");
+
+      this.selectOption(event.target.getAttribute("data-value"));
+
+      this.close();
+    };
+
+    var browserSelect = document.getElementById("browser-select");
     if (browserSelect)
     {
-      new BrowserSelect(document.getElementById('browser-select'));
+      new BrowserSelect(browserSelect);
     }
 
   }, false);
 }());