doc/_templates/searchbox.html

{#
  Override the default searchbox from RTD theme to provide the ability to select a search method
  (ex. built-in search, Google Custom Search, ...)
#}
{%- if ('singlehtml' not in builder) %}
<div class="search-container" role="search">
  <form id="rtd-search-form" class="wy-form" action="{{ pathto('search') }}" method="get">
    <input type="search" name="q" placeholder="{{ _('Search docs') }}"
           aria-label="{{ _('Search docs') }}" />
    {%- if google_searchengine_id is defined %}
    <span id="search-se-settings-icon" class="fa fa-gear" role="button" tabindex="0"
          title="Search settings" aria-label="Search settings"
          aria-haspopup="true" aria-controls="search-se-menu" aria-expanded="false"
          onclick="toggleSearchEngineSettingsMenu()">
    </span>
    <div id="search-se-menu" role="menu" aria-labelledby="search-se-settings-icon">
      <ul>
        <li id="search-se-menuitem-sphinx" role="menuitemradio" tabindex="-1"
            aria-label="Built-in search" onclick="switchSearchEngine('sphinx')">
          Built-in search <span class="fa fa-check">
        </li>
        <li id="search-se-menuitem-google" role="menuitemradio" tabindex="-1"
            aria-label="Google search" onclick="switchSearchEngine('google')">
          Google search <span class="fa fa-check">
        </li>
    </div>
    {%- endif %}
    <input type="hidden" name="check_keywords" value="yes" />
    <input type="hidden" name="area" value="default" />
  </form>
</div>
{%- if google_searchengine_id is defined %}
<script>
(function () {
  var form = document.getElementById("rtd-search-form");
  var searchMenu = document.getElementById("search-se-menu");
  var isBrowsingLatest = window.location.pathname.startsWith("/latest");
  var preferenceKey = "search-se-" + (isBrowsingLatest ? "latest" : "default");
  var query = new URLSearchParams(window.location.search).get("q");

  if (query !== null) {
    form.q.value = query;
    form.q.focus();
  }

  // Load the saved search preference. Defaults to Google when browsing "/latest" documentation,
  // built-in Sphinx search otherwise.
  var engine = localStorage.getItem(preferenceKey);
  if (engine === null) {
    engine = isBrowsingLatest ? "google" : "sphinx";
  }
  setActiveSearchEngine(engine);

  setSearchEngineSettingsMenuVisibility = function (visible) {
    searchMenu.style.display = visible ? "block" : "none";
    document
      .getElementById("search-se-settings-icon")
      .setAttribute("aria-expanded", visible ? "true" : "false");
  };

  window.toggleSearchEngineSettingsMenu = function () {
    isVisible = searchMenu.style.display === "block";
    setSearchEngineSettingsMenuVisibility(!isVisible);
  };

  function setActiveSearchEngine(engine) {
    if(engine === "sphinx") {
      form.action = "{{ pathto('search') }}";
      form.q.placeholder = "Search docs (built-in search)";
    } else {
      form.action = "{{ pathto('gsearch') }}";
      form.q.placeholder = "Search docs (powered by Google)";
    }

    var selectedElement = document.getElementById("search-se-menuitem-" + engine);
    var otherElement = document.getElementById(
      "search-se-menuitem-" + (engine === "sphinx" ? "google" : "sphinx")
    );

    selectedElement.classList.add("selected");
    selectedElement.setAttribute("aria-checked", "true");
    otherElement.classList.remove("selected");
    otherElement.setAttribute("aria-checked", "false");
  }

  window.switchSearchEngine = function (engine) {
    setActiveSearchEngine(engine);
    localStorage.setItem(preferenceKey, engine);
    setSearchEngineSettingsMenuVisibility(false);
    form.q.focus();
    if (form.q.value !== "") {
      form.submit();
    }
  };

  // Close the dropdown if the user clicks outside of it
  window.onclick = function (event) {
    if (!event.target.matches("#search-se-settings-icon")) {
      if (searchMenu.style.display === "block") {
        setSearchEngineSettingsMenuVisibility(false);
      }
    }
  };

  document.addEventListener("keydown", function (event) {
    if(searchMenu.style.display === "none") return;

    let menuItems = document.querySelectorAll('[role="menuitemradio"]');
    let currentIndex = Array.from(menuItems).findIndex((item) => item === document.activeElement);

    if (event.key === "ArrowDown" || event.key === "ArrowUp") {
      let nextIndex = event.key === "ArrowDown" ? currentIndex + 1 : currentIndex - 1;

      if (nextIndex >= menuItems.length) nextIndex = 0;
      if (nextIndex < 0) nextIndex = menuItems.length - 1;

      menuItems[nextIndex].focus();
      event.preventDefault();
    } else if (event.key === "Enter") {
      let activeItem = document.activeElement;
      if (activeItem && activeItem.getAttribute("role") === "menuitemradio") {
        activeItem.click();
        event.preventDefault();
      }
    }
  });
})();
</script>
{%- endif %}
{%- endif %}