javascript - Clear data in kendo ui grid -


hello read article use kendoui grid angularjs directive , create sample project
use directive grid :

<div kendo-grid="kendo.cargrid" k-options="maingridoptions"></div>

my problem when click set new data button , grid showing data , next click clear data button , grid clear data , next click again set new data button grid doesn't show data

whats wrong it? did forgot?

<!doctype html>  <html>  <head>    <meta charset="utf-8">    <title>untitled</title>      <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.2.621/styles/kendo.common.min.css">    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.2.621/styles/kendo.rtl.min.css">    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.2.621/styles/kendo.default.min.css">    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.2.621/styles/kendo.mobile.all.min.css">      <script src="https://code.jquery.com/jquery-1.12.3.min.js"></script>    <script src="https://kendo.cdn.telerik.com/2017.2.621/js/angular.min.js"></script>    <script src="https://kendo.cdn.telerik.com/2017.2.621/js/jszip.min.js"></script>    <script src="https://kendo.cdn.telerik.com/2017.2.621/js/kendo.all.min.js"></script></head>  <body>         <div id="example" ng-app="kendodemos">        <div ng-controller="myctrl">          <button ng-click="newdata()">set new data </button>          <button ng-click="cleardata()">clear data </button>                      <div kendo-grid="kendo.cargrid" k-options="maingridoptions"></div>                 </div>      </div>      <script>        angular.module("kendodemos", [ "kendo.directives" ])          .controller("myctrl", function($scope){          $scope.onchange = function(selected,data,dataiteam,angulardataitem) {            console.log("selected: "+ selected.selected,data,dataiteam,angulardataitem);            console.log("data: ", data);            console.log("dataiteam: ", dataiteam);            console.log("angulardataitem: ", angulardataitem);                              }          $scope.cleardata=function(){          	var grid = $scope.kendo.cargrid;              var datasource = grid.datasource;              //alert(datasource);              datasource.data([]);//clear out old data          };          $scope.newdata=function(){          	 $scope.maingridoptions = {            datasource: {              type: "odata",              transport: {                read: "https://demos.telerik.com/kendo-ui/service/northwind.svc/employees"              },              pagesize: 5,              serverpaging: true,              serversorting: true            },            selectable:true,            columns: [{              field: "firstname",              title: "first name",              width: "120px"            },{              field: "lastname",              title: "last name",              width: "120px"            }]          };          };                 })      </script>  </body>  </html>


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