conditional show extensions

app/assets/javascripts/app/frontend/controllers/editor.js

@@ -63,7 +63,7 @@ angular.module('app.frontend')
       }
     }
   })
-  .controller('EditorCtrl', function ($sce, $timeout, apiController, markdownRenderer, $rootScope) {
+  .controller('EditorCtrl', function ($sce, $timeout, apiController, markdownRenderer, $rootScope, extensionManager) {
 
     this.setNote = function(note, oldNote) {
       this.editorMode = 'edit';
@@ -81,6 +81,10 @@ angular.module('app.frontend')
       }
     }
 
+    this.hasAvailableExtensions = function() {
+      return extensionManager.extensionsInContextOfItem(this.note).length > 0;
+    }
+
     this.onPreviewDoubleClick = function() {
       this.editorMode = 'edit';
       this.focusEditor(100);

app/assets/javascripts/app/frontend/controllers/header.js

@@ -50,8 +50,11 @@ angular.module('app.frontend')
         extensionManager.addExtension(this.newExtensionData.url, function(response){
           if(!response) {
             alert("Unable to register this extension. Make sure the link is valid and try again.");
+          } else {
+            this.newExtensionData.url = "";
+            this.showNewExtensionForm = false;
           }
-        })
+        }.bind(this))
       }
     }