script.js

document.addEventListener('DOMContentLoaded', function() {
  // Key map
  var ENTER = 13;
  var ESCAPE = 27;
  var SPACE = 32;
  var UP = 38;
  var DOWN = 40;
  var TAB = 9;

  function closest (element, selector) {
    if (Element.prototype.closest) {
      return element.closest(selector);
    }
    do {
      if (Element.prototype.matches && element.matches(selector)
        || Element.prototype.msMatchesSelector && element.msMatchesSelector(selector)
        || Element.prototype.webkitMatchesSelector && element.webkitMatchesSelector(selector)) {
        return element;
      }
      element = element.parentElement || element.parentNode;
    } while (element !== null && element.nodeType === 1);
    return null;
  }

  // social share popups
  Array.prototype.forEach.call(document.querySelectorAll('.share a'), function(anchor) {
    anchor.addEventListener('click', function(e) {
      e.preventDefault();
      window.open(this.href, '', 'height = 500, width = 500');
    });
  });

  // In some cases we should preserve focus after page reload
  function saveFocus() {
    var activeElementId = document.activeElement.getAttribute("id");
    sessionStorage.setItem('returnFocusTo', '#' + activeElementId);
  }
  var returnFocusTo = sessionStorage.getItem('returnFocusTo');
  if (returnFocusTo) {
    sessionStorage.removeItem('returnFocusTo');
    var returnFocusToEl = document.querySelector(returnFocusTo);
    returnFocusToEl && returnFocusToEl.focus && returnFocusToEl.focus();
  }

  // show form controls when the textarea receives focus or backbutton is used and value exists
  var commentContainerTextarea = document.querySelector('.comment-container textarea'),
    commentContainerFormControls = document.querySelector('.comment-form-controls, .comment-ccs');

  if (commentContainerTextarea) {
    commentContainerTextarea.addEventListener('focus', function focusCommentContainerTextarea() {
      commentContainerFormControls.style.display = 'block';
      commentContainerTextarea.removeEventListener('focus', focusCommentContainerTextarea);
    });

    if (commentContainerTextarea.value !== '') {
      commentContainerFormControls.style.display = 'block';
    }
  }

  // Expand Request comment form when Add to conversation is clicked
  var showRequestCommentContainerTrigger = document.querySelector('.request-container .comment-container .comment-show-container'),
    requestCommentFields = document.querySelectorAll('.request-container .comment-container .comment-fields'),
    requestCommentSubmit = document.querySelector('.request-container .comment-container .request-submit-comment');

  if (showRequestCommentContainerTrigger) {
    showRequestCommentContainerTrigger.addEventListener('click', function() {
      showRequestCommentContainerTrigger.style.display = 'none';
      Array.prototype.forEach.call(requestCommentFields, function(e) { e.style.display = 'block'; });
      requestCommentSubmit.style.display = 'inline-block';

      if (commentContainerTextarea) {
        commentContainerTextarea.focus();
      }
    });
  }

  // Mark as solved button
  var requestMarkAsSolvedButton = document.querySelector('.request-container .mark-as-solved:not([data-disabled])'),
    requestMarkAsSolvedCheckbox = document.querySelector('.request-container .comment-container input[type=checkbox]'),
    requestCommentSubmitButton = document.querySelector('.request-container .comment-container input[type=submit]');

  if (requestMarkAsSolvedButton) {
    requestMarkAsSolvedButton.addEventListener('click', function() {
      requestMarkAsSolvedCheckbox.setAttribute('checked', true);
      requestCommentSubmitButton.disabled = true;
      this.setAttribute('data-disabled', true);
      // Element.closest is not supported in IE11
      closest(this, 'form').submit();
    });
  }

  // Change Mark as solved text according to whether comment is filled
  var requestCommentTextarea = document.querySelector('.request-container .comment-container textarea');

  if (requestCommentTextarea) {
    requestCommentTextarea.addEventListener('input', function() {
      if (requestCommentTextarea.value === '') {
        if (requestMarkAsSolvedButton) {
          requestMarkAsSolvedButton.innerText = requestMarkAsSolvedButton.getAttribute('data-solve-translation');
        }
        requestCommentSubmitButton.disabled = true;
      } else {
        if (requestMarkAsSolvedButton) {
          requestMarkAsSolvedButton.innerText = requestMarkAsSolvedButton.getAttribute('data-solve-and-submit-translation');
        }
        requestCommentSubmitButton.disabled = false;
      }
    });
  }

  // Disable submit button if textarea is empty
  if (requestCommentTextarea && requestCommentTextarea.value === '') {
    requestCommentSubmitButton.disabled = true;
  }

  // Submit requests filter form on status or organization change in the request list page
  Array.prototype.forEach.call(document.querySelectorAll('#request-status-select, #request-organization-select'), function(el) {
    el.addEventListener('change', function(e) {
      e.stopPropagation();
      saveFocus();
      closest(this, 'form').submit();
    });
  });

  // Submit requests filter form on search in the request list page
  var quickSearch = document.querySelector('#quick-search');
  quickSearch && quickSearch.addEventListener('keyup', function(e) {
    if (e.keyCode === ENTER) {
      e.stopPropagation();
      saveFocus();
      closest(this, 'form').submit();
    }
  });

  function toggleNavigation(toggle, menu) {
    var isExpanded = menu.getAttribute('aria-expanded') === 'true';
    menu.setAttribute('aria-expanded', !isExpanded);
    toggle.setAttribute('aria-expanded', !isExpanded);
  }

  function closeNavigation(toggle, menu) {
    menu.setAttribute('aria-expanded', false);
    toggle.setAttribute('aria-expanded', false);
    toggle.focus();
  }

  var burgerMenu = document.querySelector('.header .menu-button');
  var userMenu = document.querySelector('#user-nav');

  burgerMenu.addEventListener('click', function(e) {
    e.stopPropagation();
    toggleNavigation(this, userMenu);
  });


  userMenu.addEventListener('keyup', function(e) {
    if (e.keyCode === ESCAPE) {
      e.stopPropagation();
      closeNavigation(burgerMenu, this);
    }
  });

  if (userMenu.children.length === 0) {
    burgerMenu.style.display = 'none';
  }

  // Toggles expanded aria to collapsible elements
  var collapsible = document.querySelectorAll('.collapsible-nav, .collapsible-sidebar');

  Array.prototype.forEach.call(collapsible, function(el) {
    var toggle = el.querySelector('.collapsible-nav-toggle, .collapsible-sidebar-toggle');

    el.addEventListener('click', function(e) {
      toggleNavigation(toggle, this);
    });

    el.addEventListener('keyup', function(e) {
      if (e.keyCode === ESCAPE) {
        closeNavigation(toggle, this);
      }
    });
  });

  // Submit organization form in the request page
  var requestOrganisationSelect = document.querySelector('#request-organization select');

  if (requestOrganisationSelect) {
    requestOrganisationSelect.addEventListener('change', function() {
      closest(this, 'form').submit();
    });
  }

  // If a section has more than 6 subsections, we collapse the list, and show a trigger to display them all
  var seeAllTrigger = document.querySelector("#see-all-sections-trigger");
  var subsectionsList = document.querySelector(".section-list");

  if (subsectionsList && subsectionsList.children.length > 6) {
    seeAllTrigger.setAttribute("aria-hidden", false);

    seeAllTrigger.addEventListener("click", function(e) {
      subsectionsList.classList.remove("section-list--collapsed");
      seeAllTrigger.parentNode.removeChild(seeAllTrigger);
    });
  }

  // If multibrand search has more than 5 help centers or categories collapse the list
  var multibrandFilterLists = document.querySelectorAll(".multibrand-filter-list");
  Array.prototype.forEach.call(multibrandFilterLists, function(filter) {
    if (filter.children.length > 6) {
      // Display the show more button
      var trigger = filter.querySelector(".see-all-filters");
      trigger.setAttribute("aria-hidden", false);

      // Add event handler for click
      trigger.addEventListener("click", function(e) {
        e.stopPropagation();
        trigger.parentNode.removeChild(trigger);
        filter.classList.remove("multibrand-filter-list--collapsed")
      })
    }
  });

  // If there are any error notifications below an input field, focus that field
  var notificationElm = document.querySelector(".notification-error");
  if (
    notificationElm &&
    notificationElm.previousElementSibling &&
    typeof notificationElm.previousElementSibling.focus === "function"
  ) {
    notificationElm.previousElementSibling.focus();
  }

  // Dropdowns
  
  function Dropdown(toggle, menu) {
    this.toggle = toggle;
    this.menu = menu;

    this.menuPlacement = {
      top: menu.classList.contains("dropdown-menu-top"),
      end: menu.classList.contains("dropdown-menu-end")
    };

    this.toggle.addEventListener("click", this.clickHandler.bind(this));
    this.toggle.addEventListener("keydown", this.toggleKeyHandler.bind(this));
    this.menu.addEventListener("keydown", this.menuKeyHandler.bind(this));
  };

  Dropdown.prototype = {

    get isExpanded() {
      return this.menu.getAttribute("aria-expanded") === "true";
    },

    get menuItems() {
      return Array.prototype.slice.call(this.menu.querySelectorAll("[role='menuitem']"));
    },

    dismiss: function() {
      if (!this.isExpanded) return;

      this.menu.setAttribute("aria-expanded", false);
      this.menu.classList.remove("dropdown-menu-end", "dropdown-menu-top");
    },

    open: function() {
      if (this.isExpanded) return;

      this.menu.setAttribute("aria-expanded", true);
      this.handleOverflow();
    },

    handleOverflow: function() {
      var rect = this.menu.getBoundingClientRect();

      var overflow = {
        right: rect.left < 0 || rect.left + rect.width > window.innerWidth,
        bottom: rect.top < 0 || rect.top + rect.height > window.innerHeight
      };

      if (overflow.right || this.menuPlacement.end) {
        this.menu.classList.add("dropdown-menu-end");
      }

      if (overflow.bottom || this.menuPlacement.top) {
        this.menu.classList.add("dropdown-menu-top");
      }

      if (this.menu.getBoundingClientRect().top < 0) {
        this.menu.classList.remove("dropdown-menu-top")
      }
    },

    focusNextMenuItem: function(currentItem) {
      if (!this.menuItems.length) return;

      var currentIndex = this.menuItems.indexOf(currentItem);
      var nextIndex = currentIndex === this.menuItems.length - 1 || currentIndex < 0 ? 0 : currentIndex + 1;

      this.menuItems[nextIndex].focus();
    },

    focusPreviousMenuItem: function(currentItem) {
      if (!this.menuItems.length) return;

      var currentIndex = this.menuItems.indexOf(currentItem);
      var previousIndex = currentIndex <= 0 ? this.menuItems.length - 1 : currentIndex - 1;

      this.menuItems[previousIndex].focus();
    },

    clickHandler: function() {
      if (this.isExpanded) {
        this.dismiss();
      } else {
        this.open();
      }
    },

    toggleKeyHandler: function(e) {
      switch (e.keyCode) {
        case ENTER:
        case SPACE:
        case DOWN:
          e.preventDefault();
          this.open();
          this.focusNextMenuItem();
          break;
        case UP:
          e.preventDefault();
          this.open();
          this.focusPreviousMenuItem();
          break;
        case ESCAPE:
          this.dismiss();
          this.toggle.focus();
          break;
      }
    },

    menuKeyHandler: function(e) {
      var firstItem = this.menuItems[0];
      var lastItem = this.menuItems[this.menuItems.length - 1];
      var currentElement = e.target;

      switch (e.keyCode) {
        case ESCAPE:
          this.dismiss();
          this.toggle.focus();
          break;
        case DOWN:
          e.preventDefault();
          this.focusNextMenuItem(currentElement);
          break;
        case UP:
          e.preventDefault();
          this.focusPreviousMenuItem(currentElement);
          break;
        case TAB:
          if (e.shiftKey) {
            if (currentElement === firstItem) {
              this.dismiss();
            } else {
              e.preventDefault();
              this.focusPreviousMenuItem(currentElement);
            }
          } else if (currentElement === lastItem) {
            this.dismiss();
          } else {
            e.preventDefault();
            this.focusNextMenuItem(currentElement);
          }
          break;
        case ENTER:
        case SPACE:
          e.preventDefault();
          currentElement.click();
          break;
      }
    }
  }

  var dropdowns = [];
  var dropdownToggles = Array.prototype.slice.call(document.querySelectorAll(".dropdown-toggle"));

  dropdownToggles.forEach(function(toggle) {
    var menu = toggle.nextElementSibling;
    if (menu && menu.classList.contains("dropdown-menu")) {
      dropdowns.push(new Dropdown(toggle, menu));
    }
  });

  document.addEventListener("click", function(evt) {
    dropdowns.forEach(function(dropdown) {
      if (!dropdown.toggle.contains(evt.target)) {
        dropdown.dismiss();
      }
    });
  });
});