Show progressbar while loading lunr and data

assets/_utils.scss

@@ -46,6 +46,15 @@
   display: none;
 }
 
+@mixin spin($duration) {
+  animation: spin $duration ease infinite;
+  @keyframes spin {
+    100% {
+      transform: rotate(360deg);
+    }
+  }
+}
+
 @mixin fixed {
   position: fixed;
   top: 0;

assets/book.scss

@@ -138,12 +138,15 @@ ul.pagination {
 }
 
 .book-search {
-  #book-search-input {
+  position: relative;
+  margin: $padding-16 0;
+
+  input {
     border: 0;
     border-bottom: $padding-1 solid $body-font-color;
     outline: none;
 
-    padding: $padding-4 $padding-4 $padding-4 $padding-16 + $padding-4;
+    padding: $padding-4 $padding-16 + $padding-4;
     width: 100%;
 
     background: url("svg/search.svg") left center no-repeat;
@@ -153,9 +156,28 @@ ul.pagination {
     &:focus {
       opacity: 1;
     }
+
+    &:required + .book-search-spinner {
+      display: block;
+    }
   }
 
-  #book-search-results li:last-child {
+  .book-search-spinner {
+    position: absolute;
+    right: 0;
+    top: $padding-4;
+
+    width: $padding-16;
+    height: $padding-16;
+
+    border: $padding-1 solid transparent;
+    border-top-color: $body-font-color;
+    border-radius: 50%;
+
+    @include spin(1s)
+  }
+
+  li:last-child {
     margin-bottom: $padding-16 * 2;
   }
 }

assets/search.js

@@ -3,19 +3,20 @@
 (function() {
   const input = document.querySelector("#book-search-input");
   const results = document.querySelector("#book-search-results");
-  const dummy = document.querySelector("#book-search-dummy");
 
   input.addEventListener("focus", init);
   input.addEventListener("keyup", search);
 
   function init() {
-    loadScript("{{ "lunr.min.js" | relURL }}")
+    input.removeEventListener("focus", init); //init once
+    input.required = true;
+
+    loadScript("{{ "lunr.min.js" | relURL }}");
     loadScript("{{ $searchData.RelPermalink }}", function() {
       input.readOnly = false;
+      input.required = false;
       search();
     });
-
-    input.removeEventListener("focus", init);
   }
 
   function search() {
@@ -23,18 +24,18 @@
       results.removeChild(results.firstChild);
     }
 
-    if (!input.value || !window.bookSearch) {
-      return
+    if (!input.value) {
+      return;
     }
 
     const terms = lunr.tokenizer(input.value);
     const searchHits = window.bookSearch.idx.query(function(query) {
       query.term(terms, {
-        boost: 100,
+        boost: 100
       });
       query.term(terms, {
         boost: 10,
-        wildcard: lunr.Query.wildcard.LEADING | lunr.Query.wildcard.TRAILING,
+        wildcard: lunr.Query.wildcard.LEADING | lunr.Query.wildcard.TRAILING
       });
       query.term(terms, {
         editDistance: 2
@@ -43,8 +44,8 @@
 
     searchHits.slice(0, 10).forEach(function(hit) {
       const page = window.bookSearch.pages[hit.ref];
-      const li = dummy.querySelector("li").cloneNode(true),
-            a = li.querySelector("a");
+      const li = document.createElement("li"),
+            a = li.appendChild(document.createElement("a"));
 
       a.href = page.href;
       a.textContent = page.title;