Tag list: use awesomplete for tag auto completion

tpl/default/css/shaarli.css

@@ -1098,6 +1098,10 @@ form[name="linkform"].page-form {
     color: #7f7f7f;
 }
 
+#taglist .rename-tag-form {
+    display: none;
+}
+
 #taglist .delete-tag {
     color: #ac2925;
     display: none;

tpl/default/js/shaarli.js

@@ -418,6 +418,9 @@ window.onload = function () {
      *
      * TODO: support error code in the backend for AJAX requests
      */
+    var existingTags = document.querySelector('input[name="taglist"]').value.split(' ');
+    var awesomepletes = [];
+
     // Display/Hide rename form
     var renameTagButtons = document.querySelectorAll('.rename-tag');
     [].forEach.call(renameTagButtons, function(rename) {
@@ -425,7 +428,12 @@ window.onload = function () {
             event.preventDefault();
             var block = findParent(event.target, 'div', {'class': 'tag-list-item'});
             var form = block.querySelector('.rename-tag-form');
-            form.style.display = form.style.display == 'none' ? 'block' : 'none';
+            if (form.style.display == 'none' || form.style.display == '') {
+                form.style.display = 'block';
+            } else {
+                form.style.display = 'none';
+            }
+            block.querySelector('input').focus();
         });
     });
 
@@ -454,10 +462,18 @@ window.onload = function () {
                     block.setAttribute('data-tag', totag);
                     input.setAttribute('name', totag);
                     input.setAttribute('value', totag);
-                    input.parentNode.style.display = 'none';
+                    findParent(input, 'div', {'class': 'rename-tag-form'}).style.display = 'none';
                     block.querySelector('a.tag-link').innerHTML = htmlEntities(totag);
                     block.querySelector('a.tag-link').setAttribute('href', '?searchtags='+ encodeURIComponent(totag));
                     block.querySelector('a.rename-tag').setAttribute('href', '?do=changetag&fromtag='+ encodeURIComponent(totag));
+
+                    // Refresh awesomplete values
+                    for (var key in existingTags) {
+                        if (existingTags[key] == fromtag) {
+                            existingTags[key] = totag;
+                        }
+                    }
+                    awesomepletes = updateAwesompleteList('.rename-tag-input', existingTags, awesomepletes);
                 }
             };
             xhr.send('renametag=1&fromtag='+ encodeURIComponent(fromtag) +'&totag='+ encodeURIComponent(totag) +'&token='+ token);
@@ -468,6 +484,7 @@ window.onload = function () {
     // Validate input with enter key
     var renameTagInputs = document.querySelectorAll('.rename-tag-input');
     [].forEach.call(renameTagInputs, function(rename) {
+
         rename.addEventListener('keypress', function(event) {
             if (event.keyCode === 13) { // enter
                 findParent(event.target, 'div', {'class': 'tag-list-item'}).querySelector('.validate-rename-tag').click();
@@ -497,8 +514,19 @@ window.onload = function () {
             }
         });
     });
+
+    updateAwesompleteList('.rename-tag-input', document.querySelector('input[name="taglist"]').value.split(' '), awesomepletes);
 };
 
+/**
+ * Find a parent element according to its tag and its attributes
+ *
+ * @param element    Element where to start the search
+ * @param tagName    Expected parent tag name
+ * @param attributes Associative array of expected attributes (name=>value).
+ *
+ * @returns Found element or null.
+ */
 function findParent(element, tagName, attributes)
 {
     while (element) {
@@ -522,6 +550,9 @@ function findParent(element, tagName, attributes)
     return null;
 }
 
+/**
+ * Ajax request to refresh the CSRF token.
+ */
 function refreshToken()
 {
     var xhr = new XMLHttpRequest();
@@ -533,6 +564,33 @@ function refreshToken()
     xhr.send();
 }
 
+/**
+ * Update awesomplete list of tag for all elements matching the given selector
+ *
+ * @param selector  CSS selector
+ * @param tags      Array of tags
+ * @param instances List of existing awesomplete instances
+ */
+function updateAwesompleteList(selector, tags, instances)
+{
+    // First load: create Awesomplete instances
+    if (instances.length == 0) {
+        var elements = document.querySelectorAll(selector);
+        [].forEach.call(elements, function (element) {
+            instances.push(new Awesomplete(
+                element,
+                {'list': tags}
+            ));
+        });
+    } else {
+        // Update awesomplete tag list
+        for (var key in instances) {
+            instances[key].list = tags;
+        }
+    }
+    return instances;
+}
+
 /**
  * html_entities in JS
  *

tpl/default/tag.list.html

@@ -57,7 +57,7 @@ <h2 class="window-title">{'Tag list'|t} - {$countTags} {'tags'|t}</h2>
             {/loop}
           </div>
           {if="isLoggedIn()===true"}
-            <div class="rename-tag-form pure-u-1" style="display:none;">
+            <div class="rename-tag-form pure-u-1">
               <input type="text" name="{$key}" value="{$key}" class="rename-tag-input" />
               <a href="#" class="validate-rename-tag"><i class="fa fa-check"></i></a>
             </div>
@@ -74,6 +74,10 @@ <h2 class="window-title">{'Tag list'|t} - {$countTags} {'tags'|t}</h2>
   </div>
 </div>
 
+{if="isLoggedIn()===true"}
+  <input type="hidden" name="taglist" value="{loop="$tags"}{$key} {/loop}"
+{/if}
+
 {include="tag.sort"}
 
 {include="page.footer"}