1 files changed, 100 insertions, 0 deletions
diff --git a/helpcontent2/help3xsl/a11y-toggle.js b/helpcontent2/help3xsl/a11y-toggle.js
new file mode 100644
index 000000000..821a8e027
--- /dev/null
+++ b/helpcontent2/help3xsl/a11y-toggle.js
@@ -0,0 +1,100 @@
+/*
+MIT License
+
+Copyright (c) 2016 Edenspiekermann
+
+*/
+
+(function () {
+  'use strict';
+
+  var internalId = 0;
+  var togglesMap = {};
+  var targetsMap = {};
+
+  function $ (selector, context) {
+    return Array.prototype.slice.call(
+      (context || document).querySelectorAll(selector)
+    );
+  }
+
+  function getClosestToggle (element) {
+    if (element.closest) {
+      return element.closest('[data-a11y-toggle]');
+    }
+
+    while (element) {
+      if (element.nodeType === 1 && element.hasAttribute('data-a11y-toggle')) {
+        return element;
+      }
+
+      element = element.parentNode;
+    }
+
+    return null;
+  }
+
+  function handleToggle (toggle) {
+    var target = toggle && targetsMap[toggle.getAttribute('aria-controls')];
+
+    if (!target) {
+      return false;
+    }
+
+    var toggles = togglesMap['#' + target.id];
+    var isExpanded = target.getAttribute('aria-hidden') === 'false';
+
+    target.setAttribute('aria-hidden', isExpanded);
+    toggles.forEach(function (toggle) {
+      toggle.setAttribute('aria-expanded', !isExpanded);
+    });
+  }
+
+  var initA11yToggle = function (context) {
+    togglesMap = $('[data-a11y-toggle]', context).reduce(function (acc, toggle) {
+      var selector = '#' + toggle.getAttribute('data-a11y-toggle');
+      acc[selector] = acc[selector] || [];
+      acc[selector].push(toggle);
+      return acc;
+    }, togglesMap);
+
+    var targets = Object.keys(togglesMap);
+    targets.length && $(targets).forEach(function (target) {
+      var toggles = togglesMap['#' + target.id];
+      var isExpanded = target.hasAttribute('data-a11y-toggle-open');
+      var labelledby = [];
+
+      toggles.forEach(function (toggle) {
+        toggle.id || toggle.setAttribute('id', 'a11y-toggle-' + internalId++);
+        toggle.setAttribute('aria-controls', target.id);
+        toggle.setAttribute('aria-expanded', isExpanded);
+        labelledby.push(toggle.id);
+      });
+
+      target.setAttribute('aria-hidden', !isExpanded);
+      target.hasAttribute('aria-labelledby') || target.setAttribute('aria-labelledby', labelledby.join(' '));
+
+      targetsMap[target.id] = target;
+    });
+  };
+
+  document.addEventListener('DOMContentLoaded', function () {
+    initA11yToggle();
+  });
+
+  document.addEventListener('click', function (event) {
+    var toggle = getClosestToggle(event.target);
+    handleToggle(toggle);
+  });
+
+  document.addEventListener('keyup', function (event) {
+    if (event.which === 13 || event.which === 32) {
+      var toggle = getClosestToggle(event.target);
+      if (toggle && toggle.getAttribute('role') === 'button') {
+        handleToggle(toggle);
+      }
+    }
+  });
+
+  window && (window.a11yToggle = initA11yToggle);
+})();