Create algolia-search-scripts.html: size optimization

mmistakes/minimal-mistakes#3691

_includes/search/algolia-search-scripts.html

@@ -0,0 +1,82 @@
+<script>
+// Including InstantSearch.js library and styling
+const loadSearch = function() {
+  const loadCSS = function(src) {
+    var link = document.createElement('link');
+    link.rel = 'stylesheet';
+    link.type = 'text/css';
+    link.href = src;
+    link.media = 'all';
+    document.head.appendChild(link);
+  };
+
+  var script = document.createElement('script');
+  script.setAttribute("type", "text/javascript");
+  script.setAttribute("src", "https://cdn.jsdelivr.net/npm/instantsearch.js@2.3.3/dist/instantsearch.min.js");
+  script.addEventListener("load", function() {
+    // Instantiating InstantSearch.js with Algolia credentials
+    const search = instantsearch({
+      appId: '{{ site.algolia.application_id }}',
+      apiKey: '{{ site.algolia.search_only_api_key }}',
+      indexName: '{{ site.algolia.index_name }}',
+      searchParameters: {
+        restrictSearchableAttributes: ['title', 'content']
+      }
+    });
+
+    const hitTemplate = function(hit) {
+      const url = hit.url;
+      const hightlight = hit._highlightResult;
+      const title = hightlight.title && hightlight.title.value  || "";
+      const content = hightlight.html && hightlight.html.value  || "";
+
+      return `
+        <div class="list__item">
+          <article class="archive__item" itemscope itemtype="https://schema.org/CreativeWork">
+            <h2 class="archive__item-title" itemprop="headline"><a href="{{ site.baseurl }}${url}">${title}</a></h2>
+            <div class="archive__item-excerpt" itemprop="description">${content}</div>
+          </article>
+        </div>
+      `;
+    }
+
+    // Adding searchbar and results widgets
+    search.addWidget(
+      instantsearch.widgets.searchBox({
+        container: '.search-searchbar',
+        {% unless site.algolia.powered_by == false %}poweredBy: true,{% endunless %}
+        placeholder: '{{ site.data.ui-text[site.locale].search_placeholder_text | default: "Enter your search term..." }}'
+      })
+    );
+    search.addWidget(
+      instantsearch.widgets.hits({
+        container: '.search-hits',
+        templates: {
+          item: hitTemplate,
+          empty: '{{ site.data.ui-text[site.locale].search_algolia_no_results | default: "No results" }}',
+        }
+      })
+    );
+
+    if (!search.started) {
+      search.start();
+    }
+  });
+  document.body.appendChild(script);
+
+  loadCSS("https://cdn.jsdelivr.net/npm/instantsearch.js@2.3.3/dist/instantsearch.min.css");
+  loadCSS("https://cdn.jsdelivr.net/npm/instantsearch.js@2.3.3/dist/instantsearch-theme-algolia.min.css");
+};
+
+// Starting the search only when toggle is clicked
+$(document).ready(function() {
+  var scriptLoaded = false;
+
+  $(".search__toggle").on("click", function() {
+    if (!scriptLoaded) {
+      loadSearch();
+      scriptLoaded = true;
+    }
+  });
+});
+</script>