homepage: use self written typeahead implementation

Use a self written typeahead inmplemenation which gets rid of the
jQuery requirement. This saves upgrading issues and reduces the amount
of data to be loaded for the homepage by half.

3 files changed, 137 insertions, 36 deletions

diff --git a/sitestatic/archweb.css b/sitestatic/archweb.css
index 209561f9..f4b791ac 100644
--- a/sitestatic/archweb.css
+++ b/sitestatic/archweb.css
@@ -541,7 +541,7 @@ h3 span.arrow {
         padding: 0.15em 0.1em;
         margin: 0;
         min-width: 10em;
-        font-size: 0.812em;
+        font-size: 1em;
         text-align: left;
         list-style: none;
         background-color: #f6f9fc;
@@ -552,6 +552,7 @@ h3 span.arrow {
             color: #000;
         }
 
+        .pkgsearch-typeahead li:hover a,
         .pkgsearch-typeahead li.active a {
             color: #07b;
         }
diff --git a/sitestatic/homepage.js b/sitestatic/homepage.js
index d0dc3444..b46cf0b4 100644
--- a/sitestatic/homepage.js
+++ b/sitestatic/homepage.js
@@ -1,26 +1,135 @@
-!function(e){"use strict";var t=function(t,n){this.$element=e(t),this.options=e.extend({},e.fn.typeahead.defaults,n),this.matcher=this.options.matcher||this.matcher,this.sorter=this.options.sorter||this.sorter,this.highlighter=this.options.highlighter||this.highlighter,this.updater=this.options.updater||this.updater,this.$menu=e(this.options.menu).appendTo("body"),this.source=this.options.source,this.shown=!1,this.listen()};t.prototype={constructor:t,select:function(){var e=this.$menu.find(".active").attr("data-value");return e&&this.$element.val(this.updater(e)).change(),this.hide()},updater:function(e){return e},show:function(){var t=e.extend({},this.$element.offset(),{height:this.$element[0].offsetHeight});return this.$menu.css({top:t.top+t.height,left:t.left}),this.$menu.show(),this.shown=!0,this},hide:function(){return this.$menu.hide(),this.shown=!1,this},lookup:function(t){var n;return this.query=this.$element.val(),!this.query||this.query.length<this.options.minLength?this.shown?this.hide():this:(n=e.isFunction(this.source)?this.source(this.query,e.proxy(this.process,this)):this.source,n?this.process(n):this)},process:function(t){var n=this;return t=e.grep(t,function(e){return n.matcher(e)}),t=this.sorter(t),t.length?this.render(t.slice(0,this.options.items)).show():this.shown?this.hide():this},matcher:function(e){return~e.toLowerCase().indexOf(this.query.toLowerCase())},sorter:function(e){var t=[],n=[],r=[],i;while(i=e.shift())i.toLowerCase().indexOf(this.query.toLowerCase())?~i.indexOf(this.query)?n.push(i):r.push(i):t.push(i);return t.concat(n,r)},highlighter:function(e){var t=this.query.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g,"\\$&");return e.replace(new RegExp("("+t+")","ig"),function(e,t){return"<strong>"+t+"</strong>"})},render:function(t){var n=this;return t=e(t).map(function(t,r){return t=e(n.options.item).attr("data-value",r),t.find("a").html(n.highlighter(r)),t[0]}),this.$menu.html(t),this},next:function(t){var n=this.$menu.find(".active").removeClass("active"),r=n.next();r.length||(r=e(this.$menu.find("li")[0])),r.addClass("active")},prev:function(e){var t=this.$menu.find(".active").removeClass("active"),n=t.prev();n.length||(n=this.$menu.find("li").last()),n.addClass("active")},listen:function(){this.$element.on("blur",e.proxy(this.blur,this)).on("keypress",e.proxy(this.keypress,this)).on("keyup",e.proxy(this.keyup,this)),(e.browser.chrome||e.browser.webkit||e.browser.msie)&&this.$element.on("keydown",e.proxy(this.keydown,this)),this.$menu.on("click",e.proxy(this.click,this)).on("mouseenter","li",e.proxy(this.mouseenter,this))},move:function(e){if(!this.shown)return;switch(e.keyCode){case 9:case 13:case 27:e.preventDefault();break;case 38:e.preventDefault(),this.prev();break;case 40:e.preventDefault(),this.next()}e.stopPropagation()},keydown:function(t){this.suppressKeyPressRepeat=!~e.inArray(t.keyCode,[40,38,9,13,27]),this.move(t)},keypress:function(e){if(this.suppressKeyPressRepeat)return;this.move(e)},keyup:function(e){switch(e.keyCode){case 40:case 38:break;case 9:case 13:if(!this.shown)return;this.select();break;case 27:if(!this.shown)return;this.hide();break;default:this.lookup()}e.stopPropagation(),e.preventDefault()},blur:function(e){var t=this;setTimeout(function(){t.hide()},150)},click:function(e){e.stopPropagation(),e.preventDefault(),this.select()},mouseenter:function(t){this.$menu.find(".active").removeClass("active"),e(t.currentTarget).addClass("active")}},e.fn.typeahead=function(n){return this.each(function(){var r=e(this),i=r.data("typeahead"),s=typeof n=="object"&&n;i||r.data("typeahead",i=new t(this,s)),typeof n=="string"&&i[n]()})},e.fn.typeahead.defaults={source:[],items:8,menu:'<ul class="typeahead dropdown-menu"></ul>',item:'<li><a href="#"></a></li>',minLength:1},e.fn.typeahead.Constructor=t,e(function(){e("body").on("focus.typeahead.data-api",'[data-provide="typeahead"]',function(t){var n=e(this);if(n.data("typeahead"))return;t.preventDefault(),n.typeahead(n.data())})})}(window.jQuery);
-
-function setupTypeahead() {
-    $('#pkgsearch-field').typeahead({
-        source: function(query, callback) {
-            $.getJSON('/opensearch/packages/suggest', {q: query}, function(data) {
-                callback(data[1]);
-            });
-        },
-        matcher: function(item) { return true; },
-        sorter: function(items) { return items; },
-        menu: '<ul class="pkgsearch-typeahead"></ul>',
-        items: 10,
-        updater: function(item) {
-            $('#pkgsearch-field').val(item);
-            $('#pkgsearch-form').submit();
-            return item;
+"use strict";
+
+(function() {
+  const input = document.getElementById('pkgsearch-field');
+  const form = document.getElementById('pkgsearch-form');
+  var list;
+
+  function resetResults() {
+    if (!list) return;
+    list.style.display = "none";
+    list.innerHTML = "";
+  }
+
+  function getCompleteList() {
+    if (!list) {
+      list = document.createElement("UL");
+      list.setAttribute("class", "pkgsearch-typeahead"); // remove
+      form.appendChild(list);
+      setListLocation();
+    }
+    return list;
+  }
+
+  function onListClick(e) {
+      let target = e.target;
+      while (!target.getAttribute('data-value')) {
+        target = target.parentNode;
+      }
+      input.value = target.getAttribute('data-value');
+      form.submit();
+  }
+
+  function setListLocation() {
+    if (!list) return;
+    const rects = input.getClientRects()[0];
+    list.style.top = (rects.y + rects.height) + "px";
+    list.style.left = rects.x + "px";
+  }
+
+  function loadData(data) {
+    const letter = data[0];
+    const pkgs = data[1].slice(0, 10); // Show maximum of 10 results
+
+    resetResults();
+
+    if (pkgs.length === 0) {
+      return;
+    }
+
+    const ul = getCompleteList();
+    ul.style.display = "block";
+    const fragment = document.createDocumentFragment();
+
+    for (let i = 0; i < pkgs.length; i++) {
+      const item = document.createElement("li");
+      const text = pkgs[i].replace(letter, '<b>' + letter + '</b>');
+      item.innerHTML = '<a href="#">' + text + '</a>';
+      item.setAttribute('data-value', pkgs[i]);
+      fragment.appendChild(item);
+    }
+
+    ul.appendChild(fragment);
+    ul.addEventListener('click', onListClick);
+  }
+
+  function fetchData(letter) {
+    fetch('/opensearch/packages/suggest?q=' + letter).then(function(response) {
+      return response.json();
+    }).then(function(data) {
+      loadData(data);
+    });
+  }
+
+  function onInputClick() {
+    if (input.value === "") {
+      resetResults();
+      return;
+    }
+    fetchData(input.value);
+  }
+
+  function onKeyDown(e) {
+    if (!list) return;
+
+    const elem = document.querySelector(".pkgsearch-typeahead li.active");
+    switch(e.keyCode) {
+      case 13: // enter
+        if (elem) {
+          input.value = elem.getAttribute('data-value');
+          form.submit();
+        } else {
+          form.submit();
         }
-    }).attr('autocomplete', 'off');
-    $('#pkgsearch-field').keyup(function(e) {
-        if (e.keyCode === 13 &&
-                $('ul.pkgsearch-typeahead li.active').size() === 0) {
-            $('#pkgsearch-form').submit();
+        e.preventDefault();
+        break;
+      case 38: // up
+        if (elem && elem.previousElementSibling) {
+          elem.className = "";
+          elem.previousElementSibling.className = "active";
         }
-    });
-}
+        e.preventDefault();
+        break;
+      case 40: // down
+        if (elem && elem.nextElementSibling) {
+          elem.className = "";
+          elem.nextElementSibling.className = "active";
+        } else if (!elem && list.childElementCount !== 0) {
+          list.children[0].className = "active";
+        }
+        e.preventDefault();
+        break;
+    }
+  }
+
+  // debounce https://davidwalsh.name/javascript-debounce-function
+  function debounce(func, wait, immediate) {
+    var timeout;
+    return function() {
+      var context = this, args = arguments;
+      var later = function() {
+        timeout = null;
+        if (!immediate) func.apply(context, args);
+      };
+      var callNow = immediate && !timeout;
+      clearTimeout(timeout);
+      timeout = setTimeout(later, wait);
+      if (callNow) func.apply(context, args);
+    };
+  }
+
+  input.addEventListener("input", onInputClick);
+  input.addEventListener("keydown", onKeyDown);
+  window.addEventListener('resize', debounce(setListLocation, 150));
+  document.addEventListener("click", resetResults);
+}());
diff --git a/templates/public/index.html b/templates/public/index.html
index 6b160884..e5cefe3b 100644
--- a/templates/public/index.html
+++ b/templates/public/index.html
@@ -5,6 +5,7 @@
 {% block head %}
 <link rel="alternate" type="application/rss+xml" title="Arch Linux News Updates" href="/feeds/news/" />
 <link rel="alternate" type="application/rss+xml" title="Arch Linux Package Updates" href="/feeds/packages/" />
+<script type="text/javascript" src="{% static "homepage.js" %}" defer></script>
 {% endblock %}
 
 {% block content_left %}
@@ -79,7 +80,7 @@
     <form id="pkgsearch-form" method="get" action="/packages/">
         <fieldset>
             <label for="pkgsearch-field">Package Search:</label>
-            <input id="pkgsearch-field" type="text" name="q" size="18" maxlength="200" />
+            <input id="pkgsearch-field" type="text" name="q" size="18" maxlength="200" autocomplete="off" />
         </fieldset>
     </form>
 </div>
@@ -203,13 +204,3 @@
 </div>
 {% endcache %}
 {% endblock %}
-
-{% block script_block %}
-
-{% load cdn %}{% jquery %}
-<script type="text/javascript">
-$(document).ready(function() {
-    $.ajax({ url: "{% static "homepage.js" %}", cache: true, dataType: "script", success: function() { setupTypeahead(); } });
-});
-</script>
-{% endblock %}