function CkCtrl($scope) {
  // Load initial data, doesn't matter where this comes from. Could be a service
  $scope.editorData = '<h1>This is the initial data.</h1>';
  
  var editor = CKEDITOR.instances.editor;
  
  // When data changes inside the CKEditor instance, update the scope variable
  editor.on('instanceReady', function (e) {
    this.document.on("keyup", function () {
      $scope.$apply(function () {
        $scope.editorData = editor.getData();
      });
    });
  });
}