docs/dev/r/extra.js

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// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

(function () {
  // Load the rmarkdown tabset script
  var script = document.createElement("script");
  script.type = "text/javascript";
  script.async = true;
  script.src =
    "https://cdn.jsdelivr.net/gh/rstudio/rmarkdown@47d837d3d9cd5e8e212b05767454f058db7d2789/inst/rmd/h/navigation-1.1/tabsets.js";
  script.integrity = "sha256-Rs54TE1FCN1uLM4f7VQEMiRTl1Ia7TiQLkMruItwV+Q=";
  script.crossOrigin = "anonymous";

  // Run the processing as the onload callback
  script.onload = () => {
    // Monkey patch the .html method to use the .text method
    $(document).ready(function () {
      (function ($) {
        $.fn.html = function (content) {
          return this.text();
        };
      })(jQuery);

      window.buildTabsets("toc");
    });

    $(document).ready(function () {
      $(".tabset-dropdown > .nav-tabs > li").click(function () {
        $(this).parent().toggleClass("nav-tabs-open");
      });
    });

    $(document).ready(function () {
      /**
       * The tabset creation above sometimes relies on empty headers to stop the
       * tabbing. Though they shouldn't be included in the TOC in the first place,
       * this will remove empty headers from the TOC after it's created.
       */

      // find all the empty <a> elements and remove them (and their parents)
      var empty_a = $("#toc").find("a").filter(":empty");
      empty_a.parent().remove();

      // now find any empty <ul>s and remove them too
      var empty_ul = $("#toc").find("ul").filter(":empty");
      empty_ul.remove();
    });

  };

  document.head.appendChild(script);
})();