Ui-Grid AngularJs Selected rows to send them to back-end

var app = angular.module('app', ['ngTouch', 'ui.grid', 'ui.grid.selection']);

app.controller('MainCtrl', ['$scope', '$http', '$log', '$timeout', 'uiGridConstants', function ($scope, $http, $log, $timeout, uiGridConstants) {
  $scope.gridOptions = { 
    enableRowSelection: true,
    enableSelectAll: true,
    selectionRowHeaderWidth: 35,
    rowHeight: 35,
    showGridFooter:true
  };

  $scope.gridOptions.columnDefs = [
    { name: 'id' },
    { name: 'name'},
    { name: 'age', displayName: 'Age (not focusable)', allowCellFocus : false },
    { name: 'address.city' }
  ];

  $scope.gridOptions.multiSelect = true;
  
  $scope.getSelectedRows = function() {
    $scope.mySelectedRows = $scope.gridApi.selection.getSelectedRows();
  };

  $http.get('https://cdn.rawgit.com/angular-ui/ui-grid.info/gh-pages/data/500_complex.json')
    .success(function(data) {
      $scope.gridOptions.data = data;
      $scope.mySelectedRows = $scope.gridApi.selection.getSelectedRows();
      $timeout(function() {
        if($scope.gridApi.selection.selectRow){
          $scope.gridApi.selection.selectRow($scope.gridOptions.data[0]);
        }
      });
    });

    $scope.info = {};

    $scope.toggleMultiSelect = function() {
      $scope.gridApi.selection.setMultiSelect(!$scope.gridApi.grid.options.multiSelect);
    };

    $scope.toggleRow1 = function() {
      $scope.gridApi.selection.toggleRowSelection($scope.gridOptions.data[0]);
    };
    
    $scope.gridOptions.onRegisterApi = function(gridApi){
      //set gridApi on scope
      $scope.gridApi = gridApi;
      
      
    };
}]);

.grid {
  width: 100%;
  height: 400px;
}

<!doctype html>
<html ng-app="app">
  <head>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.26/angular.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.26/angular-touch.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.26/angular-animate.js"></script>
    <script src="http://ui-grid.info/docs/grunt-scripts/csv.js"></script>
    <script src="http://ui-grid.info/docs/grunt-scripts/pdfmake.js"></script>
    <script src="http://ui-grid.info/docs/grunt-scripts/vfs_fonts.js"></script>
    <script src="http://ui-grid.info/release/ui-grid-unstable.js"></script>
    <link rel="stylesheet" href="http://ui-grid.info/release/ui-grid-unstable.css" type="text/css">
    <link rel="stylesheet" href="main.css" type="text/css">
  </head>
  <body>

<div ng-controller="MainCtrl">
  <button type="button" class="btn btn-success" ng-click="getSelectedRows()">Get Selected Rows</button>
  <strong>SelectedRowCount:</strong> <span ng-bind="mySelectedRows.length"></span>
  <br/>

  <div ui-grid="gridOptions" ui-grid-selection class="grid"></div>
<pre>{{mySelectedRows}}</pre>
</div>

    <script src="app.js"></script>
  </body>
</html>