kendo ui form update cancel button -

i trying simple kendo ui form 'save' , 'cancel' buttons. using kendo.observable bind data form. functionality trying achieve is, if 'save' button clicked, form data saved. else, if 'cancel' clicked form come read-only mode previous data present. this, first saving model data in 'originalvalue' property on click of update button. if 'cancel' clicked, 'fields' model data restored 'originalvalue'. issue , 'originalvalue' not contain original value. gets updated when user editing during 'save'. question - how retain original model data can refreshed on cancel? please find below code. appreciate help, thanks.

<script type="text/javascript">     var viewmodel = kendo.observable ({          updated: false,         originalvalue: {},          update: function(e) {             var original = this.get("fields");             this.set("originalvalue", original);             this.set("updated", true);         },          save: function(e) {              e.preventdefault();              if (validator.validate()) {                     // make ajax call save data                     this.set("updated", false);              }           },          cancel: function(e) {             var original = this.get("originalvalue");             validator.destroy();             this.set("fields", original);             this.set("updated", false);          },          fields: {}     });      viewmodel.set("fields", formarray);          kendo.bind($("#outerform"), viewmodel);      // prepare validator     var validator = $("#outerform").kendovalidator().data("kendovalidator"); 

i had make exact thing on form developing. using datasource object data had use cancelchange().

the thing did there: 1. made datasource schema:

 ... schema: { model: {id: "id"}} ... 

2. got object editing mapped id:

clientdatasource.cancelchanges(clientdatasource.get(this.get("contactid"))); 

where contactid created in setdata function have passed id:

 this.set("contactid", contactid); 

as may have notices , understood, have problem here arent using datasource rather data fields? problem here originalvalue inside observable object , referenced variable original , has observable properties. should have variable originalvalue defined outside observable object:

var originalvalue;  var viewmodel = kendo.observable ({ ... 

and should send formarray variable have defaults load before observable object loaded such as:

originalvalue =   formarray;   viewmodel.set("fields", formarray);   

so when need cancel should have:

cancel: function(e) {             var original = originalvalue;             validator.destroy();             this.set("fields", original);             this.set("updated", false);          },  

i havent tested should provide guidance on how solve problem.