text: // Copyright (c) Microsoft. All rights reserved. Licensed under the MIT license. See LICENSE file in the project root for full license information.
  $(function () {
    var active = 'active';
    var expanded = 'in';
    var collapsed = 'collapsed';
    var filtered = 'filtered';
    var show = 'show';
    var hide = 'hide';
    var util = new utility();
  
    highlight();
    enableSearch();
  
    renderTables();
    renderAlerts();
    renderLinks();
    renderNavbar();
    renderSidebar();
    renderAffix();
    renderFooter();
    renderLogo();
  
    window.refresh = function (article) {
      // Update markup result
      if (typeof article == 'undefined' || typeof article.content == 'undefined')
        console.error("Null Argument");
      $("article.content").html(article.content);
  
      highlight();
      renderTables();
      renderAlerts();
      renderAffix();
    }
  
    // Styling for tables in conceptual documents using Bootstrap.
    // See http://getbootstrap.com/css/#tables
    function renderTables() {
      $('table').addClass('table table-bordered table-striped table-condensed');
    }
  
    // Styling for alerts.
    function renderAlerts() {
      $('.NOTE, .TIP').addClass('alert alert-info');
      $('.WARNING').addClass('alert alert-warning');
      $('.IMPORTANT, .CAUTION').addClass('alert alert-danger');
    }
  
    // Anchorjs 3.2.2 fails when title content contains '<' and '>'.
    // TODO: enable this when anchorjs fixes this issue
    // Enable anchors for headings.
    // (function () {
    //   anchors.options = {
    //     placement: 'left',
    //     visible: 'touch'
    //   };
    //   anchors.add('article h2, article h3, article h4, article h5, article h6');
    // })();
  
    // Open links to different host in a new window.
    function renderLinks() {
      if ($("meta[property='docfx:newtab']").attr("content") === "true") {
        $(document.links).filter(function () {
          return this.hostname !== window.location.hostname;
        }).attr('target', '_blank');
      }
    }
  
    // Enable highlight.js
    function highlight() {
      $('pre code').each(function (i, block) {
        hljs.highlightBlock(block);
      });
      $('pre code[highlight-lines]').each(function (i, block) {
        if (block.innerHTML === "") return;
        var lines = block.innerHTML.split('\n');
  
        queryString = block.getAttribute('highlight-lines');
        if (!queryString) return;
  
        var ranges = queryString.split(',');
        for (var j = 0, range; range = ranges[j++];) {
          var found = range.match(/^(\d+)\-(\d+)?$/);
          if (found) {
            // consider region as `{startlinenumber}-{endlinenumber}`, in which {endlinenumber} is optional
            var start = +found[1];
            var end = +found[2];
            if (isNaN(end) || end > lines.length) {
              end = lines.length;
            }
          } else {
            // consider region as a sigine line number
            if (isNaN(range)) continue;
            var start = +range;
            var end = start;
          }
          if (start <= 0 || end <= 0 || start > end || start > lines.length) {
            // skip current region if invalid
            continue;
          }
          lines[start - 1] = '<span class="line-highlight">' + lines[start - 1];
          lines[end - 1] = lines[end - 1] + '</span>';
        }
  
        block.innerHTML = lines.join('\n');
      });
    }
  
    // Support full-text-search
    function enableSearch() {
      var query;
      var relHref = $("meta[property='docfx\\:rel']").attr("content");
      if (typeof relHref === 'undefined') {
        return;
      }
      try {
        var worker = new Worker(relHref + 'styles/search-worker.js');
        if (!worker && !window.worker) {
          localSearch();
        } else {
          webWorkerSearch();
        }
  
        renderSearchBox();
        highlightKeywords();
        addSearchEvent();
      } catch (e) {
        console.error(e);
      }
  
      //Adjust the position of search box in navbar
      function renderSearchBox() {
        autoCollapse();
        $(window).on('resize', autoCollapse);
        $(document).on('click', '.navbar-collapse.in', function (e) {
          if ($(e.target).is('a')) {
            $(this).collapse('hide');
          }
        });
  
        function autoCollapse() {
          var navbar = $('#autocollapse');
          if (navbar.height() === null) {
            setTimeout(autoCollapse, 300);
          }
          navbar.removeClass(collapsed);
          if (navbar.height() > 60) {
            navbar.addClass(collapsed);
          }
        }
      }
  
      // Search factory
      function localSearch() {
        console.log("using local search");
        var lunrIndex = lunr(function () {
          this.ref('href');
          this.field('title', { boost: 50 });
          this.field('keywords', { boost: 20 });
        });
        lunr.tokenizer.seperator = /[\s\-\.]+/;
        var searchData = {};
        var searchDataRequest = new XMLHttpRequest();
  
        var indexPath = relHref + "index.json";
        if (indexPath) {
          searchDataRequest.open('GET', indexPath);
          searchDataRequest.onload = function () {
            if (this.status != 200) {
              return;
            }
            searchData = JSON.parse(this.responseText);
            for (var prop in searchData) {
              if (searchData.hasOwnProperty(prop)){
                lunrIndex.add(searchData[prop]);
              }
            }
          }
          searchDataRequest.send();
        }
  
        $("body").bind("queryReady", function () {
          var hits = lunrIndex.search(query);
          var results = [];
          hits.forEach(function (hit) {
            var item = searchData[hit.ref];
            results.push({ 'href': item.href, 'title': item.title, 'keywords': item.keywords });
          });
          handleSearchResults(results);
        });
      }
  
      function webWorkerSearch() {
        console.log("using Web Worker");
        var indexReady = $.Deferred();
  
        worker.onmessage = function (oEvent) {
          switch (oEvent.data.e) {
            case 'index-ready':
              indexReady.resolve();
              break;
            case 'query-ready':
              var hits = oEvent.data.d;
              handleSearchResults(hits);
              break;
          }
        }
  
        indexReady.promise().done(function () {
          $("body").bind("queryReady", function () {
            worker.postMessage({ q: query });
          });
        });
      }
  
      // Highlight the searching keywords
      function highlightKeywords() {
        var q = url('?q');
        if (q !== null) {
          var keywords = q.split("%20");
          keywords.forEach(function (keyword) {
            if (keyword !== "") {
              $('.data-searchable *').mark(keyword);
              $('article *').mark(keyword);
            }
          });
        }
      }
  
      function addSearchEvent() {
        $('body').bind("searchEvent", function () {
          $('#search-query').keypress(function (e) {
            return e.which !== 13;
          });
  
          $('#search-query').keyup(function () {
            query = $(this).val();
            if (query.length < 3) {
              flipContents("show");
            } else {
              flipContents("hide");
              $("body").trigger("queryReady");
              $('#search-results>.search-list').text('Search Results for "' + query + '"');
            }
          }).off("keydown");
        });
      }
  
      function flipContents(action) {
        if (action === "show") {
          $('.hide-when-search').show();
          $('#search-results').hide();
        } else {
          $('.hide-when-search').hide();
          $('#search-results').show();
        }
      }
  
      function relativeUrlToAbsoluteUrl(currentUrl, relativeUrl) {
        var currentItems = currentUrl.split(/\/+/);
        var relativeItems = relativeUrl.split(/\/+/);
        var depth = currentItems.length - 1;
        var items = [];
        for (var i = 0; i < relativeItems.length; i++) {
          if (relativeItems[i] === '..') {
            depth--;
          } else if (relativeItems[i] !== '.') {
            items.push(relativeItems[i]);
          }
        }
        return currentItems.slice(0, depth).concat(items).join('/');
      }
  
      function extractContentBrief(content) {
        var briefOffset = 512;
        var words = query.split(/\s+/g);
        var queryIndex = content.indexOf(words[0]);
        var briefContent;
        if (queryIndex > briefOffset) {
          return "..." + content.slice(queryIndex - briefOffset, queryIndex + briefOffset) + "...";
        } else if (queryIndex <= briefOffset) {
          return content.slice(0, queryIndex + briefOffset) + "...";
        }
      }
  
      function handleSearchResults(hits) {
        var numPerPage = 10;
        $('#pagination').empty();
        $('#pagination').removeData("twbs-pagination");
        if (hits.length === 0) {
          $('#search-results>.sr-items').html('<p>No results found</p>');
        } else {
          $('#pagination').twbsPagination({
            totalPages: Math.ceil(hits.length / numPerPage),
            visiblePages: 5,
            onPageClick: function (event, page) {
              var start = (page - 1) * numPerPage;
              var curHits = hits.slice(start, start + numPerPage);
              $('#search-results>.sr-items').empty().append(
                curHits.map(function (hit) {
                  var currentUrl = window.location.href;
                  var itemRawHref = relativeUrlToAbsoluteUrl(currentUrl, relHref + hit.href);
                  var itemHref = relHref + hit.href + "?q=" + query;
                  var itemTitle = hit.title;
                  var itemBrief = extractContentBrief(hit.keywords);
  
                  var itemNode = $('<div>').attr('class', 'sr-item');
                  var itemTitleNode = $('<div>').attr('class', 'item-title').append($('<a>').attr('href', itemHref).attr("target", "_blank").text(itemTitle));
                  var itemHrefNode = $('<div>').attr('class', 'item-href').text(itemRawHref);
                  var itemBriefNode = $('<div>').attr('class', 'item-brief').text(itemBrief);
                  itemNode.append(itemTitleNode).append(itemHrefNode).append(itemBriefNode);
                  return itemNode;
                })
              );
              query.split(/\s+/).forEach(function (word) {
                if (word !== '') {
                  $('#search-results>.sr-items *').mark(word);
                }
              });
            }
          });
        }
      }
    };
  
    // Update href in navbar
    function renderNavbar() {
      var navbar = $('#navbar ul')[0];
      if (typeof (navbar) === 'undefined') {
        loadNavbar();
      } else {
        $('#navbar ul a.active').parents('li').addClass(active);
        renderBreadcrumb();
      }
  
      function loadNavbar() {
        var navbarPath = $("meta[property='docfx\\:navrel']").attr("content");
        if (!navbarPath) {
          return;
        }
        navbarPath = navbarPath.replace(/\\/g, '/');
        var tocPath = $("meta[property='docfx\\:tocrel']").attr("content") || '';
        if (tocPath) tocPath = tocPath.replace(/\\/g, '/');
        $.get(navbarPath, function (data) {
          $(data).find("#toc>ul").appendTo("#navbar");
          if ($('#search-results').length !== 0) {
            $('#search').show();
            $('body').trigger("searchEvent");
          }
          var index = navbarPath.lastIndexOf('/');
          var navrel = '';
          if (index > -1) {
            navrel = navbarPath.substr(0, index + 1);
          }
          $('#navbar>ul').addClass('navbar-nav');
          var currentAbsPath = util.getAbsolutePath(window.location.pathname);
          // set active item
          $('#navbar').find('a[href]').each(function (i, e) {
            var href = $(e).attr("href");
            if (util.isRelativePath(href)) {
              href = navrel + href;
              $(e).attr("href", href);
  
              // TODO: currently only support one level navbar
              var isActive = false;
              var originalHref = e.name;
              if (originalHref) {
                originalHref = navrel + originalHref;
                if (util.getDirectory(util.getAbsolutePath(originalHref)) === util.getDirectory(util.getAbsolutePath(tocPath))) {
                  isActive = true;
                }
              } else {
                if (util.getAbsolutePath(href) === currentAbsPath) {
                  isActive = true;
                }
              }
              if (isActive) {
                $(e).addClass(active);
              }
            }
          });
          renderNavbar();
        });
      }
    }
  
    function renderSidebar() {
      var sidetoc = $('#sidetoggle .sidetoc')[0];
      if (typeof (sidetoc) === 'undefined') {
        loadToc();
      } else {
        registerTocEvents();
        if ($('footer').is(':visible')) {
          $('.sidetoc').addClass('shiftup');
        }
  
        // Scroll to active item
        var top = 0;
        $('#toc a.active').parents('li').each(function (i, e) {
          $(e).addClass(active).addClass(expanded);
          $(e).children('a').addClass(active);
          top += $(e).position().top;
        })
        $('.sidetoc').scrollTop(top - 50);
  
        if ($('footer').is(':visible')) {
          $('.sidetoc').addClass('shiftup');
        }
  
        renderBreadcrumb();
      }
  
      function registerTocEvents() {
        $('.toc .nav > li > .expand-stub').click(function (e) {
          $(e.target).parent().toggleClass(expanded);
        });
        $('.toc .nav > li > .expand-stub + a:not([href])').click(function (e) {
          $(e.target).parent().toggleClass(expanded);
        });
        $('#toc_filter_input').on('input', function (e) {
          var val = this.value;
          if (val === '') {
            // Clear 'filtered' class
            $('#toc li').removeClass(filtered).removeClass(hide);
            return;
          }
  
          // Get leaf nodes
          $('#toc li>a').filter(function (i, e) {
            return $(e).siblings().length === 0
          }).each(function (i, anchor) {
            var text = $(anchor).attr('title');
            var parent = $(anchor).parent();
            var parentNodes = parent.parents('ul>li');
            for (var i = 0; i < parentNodes.length; i++) {
              var parentText = $(parentNodes[i]).children('a').attr('title');
              if (parentText) text = parentText + '.' + text;
            };
            if (filterNavItem(text, val)) {
              parent.addClass(show);
              parent.removeClass(hide);
            } else {
              parent.addClass(hide);
              parent.removeClass(show);
            }
          });
          $('#toc li>a').filter(function (i, e) {
            return $(e).siblings().length > 0
          }).each(function (i, anchor) {
            var parent = $(anchor).parent();
            if (parent.find('li.show').length > 0) {
              parent.addClass(show);
              parent.addClass(filtered);
              parent.removeClass(hide);
            } else {
              parent.addClass(hide);
              parent.removeClass(show);
              parent.removeClass(filtered);
            }
          })
  
          function filterNavItem(name, text) {
            if (!text) return true;
            if (name.toLowerCase().indexOf(text.toLowerCase()) > -1) return true;
            return false;
          }
        });
      }
  
      function loadToc() {
        var tocPath = $("meta[property='docfx\\:tocrel']").attr("content");
        if (!tocPath) {
          return;
        }
        tocPath = tocPath.replace(/\\/g, '/');
        $('#sidetoc').load(tocPath + " #sidetoggle > div", function () {
          var index = tocPath.lastIndexOf('/');
          var tocrel = '';
          if (index > -1) {
            tocrel = tocPath.substr(0, index + 1);
          }
          var currentHref = util.getAbsolutePath(window.location.pathname);
          $('#sidetoc').find('a[href]').each(function (i, e) {
            var href = $(e).attr("href");
            if (util.isRelativePath(href)) {
              href = tocrel + href;
              $(e).attr("href", href);
            }
  
            if (util.getAbsolutePath(e.href) === currentHref) {
              $(e).addClass(active);
            }
  
            $(e).text(function (index, text) {
              return util.breakText(text);
            })
          });
  
          renderSidebar();
        });
      }
    }
  
    function renderBreadcrumb() {
      var breadcrumb = [];
      $('#navbar a.active').each(function (i, e) {
        breadcrumb.push({
          href: e.href,
          name: e.innerHTML
        });
      })
      $('#toc a.active').each(function (i, e) {
        breadcrumb.push({
          href: e.href,
          name: e.innerHTML
        });
      })
  
      var html = util.formList(breadcrumb, 'breadcrumb');
      $('#breadcrumb').html(html);
    }
  
    //Setup Affix
    function renderAffix() {
      var hierarchy = getHierarchy();
      if (hierarchy.length > 0) {
        var html = '<h5 class="title">In This Article</h5>'
        html += util.formList(hierarchy, ['nav', 'bs-docs-sidenav']);
        $("#affix").empty().append(html);
        if ($('footer').is(':visible')) {
          $(".sideaffix").css("bottom", "70px");
        }
        $('#affix').on('activate.bs.scrollspy', function (e) {
          if (e.target) {
            if ($(e.target).find('li.active').length > 0) {
              return;
            }
            var top = $(e.target).position().top;
            $(e.target).parents('li').each(function (i, e) {
              top += $(e).position().top;
            });
            var container = $('#affix > ul');
            var height = container.height();
            container.scrollTop(container.scrollTop() + top - height / 2);
          }
        })
      }
  
      function getHierarchy() {
        // supported headers are h1, h2, h3, and h4
        // The topest header is ignored
        var selector = ".article article";
        var affixSelector = "#affix";
        var headers = ['h4', 'h3', 'h2', 'h1'];
        var hierarchy = [];
        var toppestIndex = -1;
        var startIndex = -1;
        // 1. get header hierarchy
        for (var i = headers.length - 1; i >= 0; i--) {
          var header = $(selector + " " + headers[i]);
          var length = header.length;
  
          // If contains no header in current selector, find the next one
          if (length === 0) continue;
  
          // If the toppest header contains only one item, e.g. title, ignore
          if (length === 1 && hierarchy.length === 0 && toppestIndex < 0) {
            toppestIndex = i;
            continue;
          }
  
          // Get second level children
          var nextLevelSelector = i > 0 ? headers[i - 1] : null;
          var prevSelector;
          for (var j = length - 1; j >= 0; j--) {
            var e = header[j];
            var id = e.id;
            if (!id) continue; // For affix, id is a must-have
            var item = {
              name: htmlEncode($(e).text()),
              href: "#" + id,
              items: []
            };
            if (nextLevelSelector) {
              var selector = '#' + cssEscape(id) + "~" + nextLevelSelector;
              var currentSelector = selector;
              if (prevSelector) currentSelector += ":not(" + prevSelector + ")";
              $(header[j]).siblings(currentSelector).each(function (index, e) {
                if (e.id) {
                  item.items.push({
                    name: htmlEncode($(e).text()), // innerText decodes text while innerHTML not
                    href: "#" + e.id
                  })
                }
              })
              prevSelector = selector;
            }
            hierarchy.push(item);
          }
          break;
        };
        hierarchy.reverse();
        return hierarchy;
      }
  
      function htmlEncode(str) {
        if (!str) return str;
        return str
          .replace(/&/g, '&amp;')
          .replace(/"/g, '&quot;')
          .replace(/'/g, '&#39;')
          .replace(/</g, '&lt;')
          .replace(/>/g, '&gt;');
      }
  
      function htmlDecode(value) {
        if (!str) return str;
        return value
          .replace(/&quot;/g, '"')
          .replace(/&#39;/g, "'")
          .replace(/&lt;/g, '<')
          .replace(/&gt;/g, '>')
          .replace(/&amp;/g, '&');
      }
  
      function cssEscape(str) {
        // see: http://stackoverflow.com/questions/2786538/need-to-escape-a-special-character-in-a-jquery-selector-string#answer-2837646
        if (!str) return str;
        return str
          .replace(/[!"#$%&'()*+,.\/:;<=>?@[\\\]^`{|}~]/g, "\\$&");
      }
    }
  
    // Show footer
    function renderFooter() {
      initFooter();
      $(window).on("scroll", showFooterCore);
  
      function initFooter() {
        if (needFooter()) {
          shiftUpBottomCss();
          $("footer").show();
        } else {
          resetBottomCss();
          $("footer").hide();
        }
      }
  
      function showFooterCore() {
        if (needFooter()) {
          shiftUpBottomCss();
          $("footer").fadeIn();
        } else {
          resetBottomCss();
          $("footer").fadeOut();
        }
      }
  
      function needFooter() {
        var scrollHeight = $(document).height();
        var scrollPosition = $(window).height() + $(window).scrollTop();
        return (scrollHeight - scrollPosition) < 1;
      }
  
      function resetBottomCss() {
        $(".sidetoc").removeClass("shiftup");
        $(".sideaffix").removeClass("shiftup");
      }
  
      function shiftUpBottomCss() {
        $(".sidetoc").addClass("shiftup");
        $(".sideaffix").addClass("shiftup");
      }
    }
  
    function renderLogo() {
      // For LOGO SVG
      // Replace SVG with inline SVG
      // http://stackoverflow.com/questions/11978995/how-to-change-color-of-svg-image-using-css-jquery-svg-image-replacement
      jQuery('img.svg').each(function () {
        var $img = jQuery(this);
        var imgID = $img.attr('id');
        var imgClass = $img.attr('class');
        var imgURL = $img.attr('src');
  
        jQuery.get(imgURL, function (data) {
          // Get the SVG tag, ignore the rest
          var $svg = jQuery(data).find('svg');
  
          // Add replaced image's ID to the new SVG
          if (typeof imgID !== 'undefined') {
            $svg = $svg.attr('id', imgID);
          }
          // Add replaced image's classes to the new SVG
          if (typeof imgClass !== 'undefined') {
            $svg = $svg.attr('class', imgClass + ' replaced-svg');
          }
  
          // Remove any invalid XML tags as per http://validator.w3.org
          $svg = $svg.removeAttr('xmlns:a');
  
          // Replace image with new SVG
          $img.replaceWith($svg);
  
        }, 'xml');
      });
    }
  
    function utility() {
      this.getAbsolutePath = getAbsolutePath;
      this.isRelativePath = isRelativePath;
      this.isAbsolutePath = isAbsolutePath;
      this.getDirectory = getDirectory;
      this.formList = formList;
      this.breakText = breakText;
  
      function getAbsolutePath(href) {
        // Use anchor to normalize href
        var anchor = $('<a href="' + href + '"></a>')[0];
        // Ignore protocal, remove search and query
        return anchor.host + anchor.pathname;
      }
  
      function isRelativePath(href) {
        return !isAbsolutePath(href);
      }
  
      function isAbsolutePath(href) {
        return (/^(?:[a-z]+:)?\/\//i).test(href);
      }
  
      function getDirectory(href) {
        if (!href) return '';
        var index = href.lastIndexOf('/');
        if (index == -1) return '';
        if (index > -1) {
          return href.substr(0, index);
        }
      }
  
  
      function formList(item, classes) {
        var level = 1;
        var model = {
          items: item
        };
        var cls = [].concat(classes).join(" ");
        return getList(model, cls);
  
        function getList(model, cls) {
          if (!model || !model.items) return null;
          var l = model.items.length;
          if (l === 0) return null;
          var html = '<ul class="level' + level + ' ' + (cls || '') + '">';
          level++;
          for (var i = 0; i < l; i++) {
            var item = model.items[i];
            var href = item.href;
            var name = item.name;
            if (!name) continue;
            html += href ? '<li><a href="' + href + '">' + name + '</a>' : '<li>' + name;
            html += getList(item, cls) || '';
            html += '</li>';
          }
          html += '</ul>';
          return html;
        }
      }
  
      function breakText(text) {
        if (!text) return text;
        return text.replace(/([a-z])([A-Z])|(\.)(\w)/g, '$1$3\u200B$2$4')
      }
    }
  })
  