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app/assets/javascripts/app/app.js

@@ -2,7 +2,9 @@
 
 var SN = SN || {};
 
-angular.module('app', [])
+angular.module('app', [
+  'ngSanitize'
+])
 
 function getParameterByName(name, url) {
   name = name.replace(/[\[\]]/g, "\\$&");

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

@@ -391,6 +391,12 @@ angular.module('app')
       this.changesMade({dontUpdateClientModified});
     }
 
+    this.toggleNotePreview = function() {
+      this.note.content.hidePreview = !this.note.content.hidePreview;
+      var dontUpdateClientModified = true;
+      this.changesMade({dontUpdateClientModified});
+    }
+
     this.toggleArchiveNote = function() {
       this.note.setAppDataItem("archived", !this.note.archived);
       this.changesMade({bypassDebouncer: true});