javascript - Knockout JS Json get -

i newbie @ knockout.js , have question. found code here. function returns {"id":"1", "name":"cardio", "image":"aslas", "header":"kardio", "message":"message\r\n"} not working. can me?

         <ul class="folders" data-bind="foreach: folders">     <li data-bind="text: $data,                css: { selected: $data == $root.chosenfolderid() },                click: $root.gotofolder"></li> </ul> <div class="mails" data-bind="with: chosenfolderdata">     <p><label>from</label>: <span data-bind="text: name"></span></p> </div>  <script>     function webmailviewmodel() {         // data         var self = this;          self.folders = ['cardio', 'classic', 'mass', 'abs']          ;         self.chosenfolderid = ko.observable();         self.chosenfolderdata = ko.observable();         self.chosenmaildata = ko.observable();         // behaviours         self.gotofolder = function(folder) {             self.chosenfolderid(folder);             self.chosenmaildata(null);             $.get(ajax_url+'dieticians/video/'+folder,null, self.chosenfolderdata);         };         self.gotofolder('inbox');      };      ko.applybindings(new webmailviewmodel()); </script> 

is looking for?: http://jsfiddle.net/58tkrbd9/3/

<ul class="folders" data-bind="foreach: folders">         <li data-bind="text: $data,                    css: { selected: $data == $root.chosenfolderid() },                    click: $root.gotofolder"></li>     </ul>     <br>     <div class="mails" data-bind="with: chosenfolderdata">         <p><label>from</label>: <span data-bind="text: name"></span></p>     </div>     <script type="text/javascript">         function webmailviewmodel() {             var self = this;              self.folders = ko.observablearray(['cardio', 'classic', 'mass', 'abs']);             self.chosenfolderid = ko.observable();             self.chosenfolderdata = ko.observable();             self.chosenmaildata = ko.observable();             // behaviours             self.gotofolder = function(folder) {                 console.log(folder);                 self.chosenfolderid(folder);                 self.chosenmaildata(null);                 //apply ajax call , fill 'chosenfolderdata'                  self.chosenfolderdata({"id":"1", "name":"cardio", "image":"aslas", "header":"kardio", "message":"message\r\n"});               };             self.gotofolder('inbox');         };          ko.applybindings(new webmailviewmodel());     </script>