AngularJS Table Sorting

<!DOCTYPE html>
<html>

<head>
  <script data-require="jquery@2.0.3" data-semver="2.0.3" src="http://code.jquery.com/jquery-2.0.3.min.js"></script>
  <link data-require="bootstrap-css@3.1.1" data-semver="3.1.1" rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" />
  <script data-require="bootstrap@3.1.1" data-semver="3.1.1" src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
  <script data-require="angular.js@1.2.14" data-semver="1.2.14" src="http://code.angularjs.org/1.2.14/angular.js"></script>
  <link rel="stylesheet" href="style.css" />
  <script src="script.js"></script>
</head>

<body ng-app="tablePlunker" style="margin: 10px;">
  <h4>Hello Plunker!</h4>
  <div ng-controller="GridController">

    <table class="table table-hover table-responsive table-striped">
      <thead>
        <tr>
          <th ng-class="selectedCls('id')" ng-click="changeSorting('id')">
            Id <i class="glyphicon glyphicon-sort-by-alphabet-alt" ng-show="sort.descending"></i>
            <i class="glyphicon glyphicon-sort-by-alphabet" ng-show="!sort.descending"></i>
          </th>
          <th ng-class="selectedCls('date')" ng-click="changeSorting('date')">Date 
            <i class="glyphicon glyphicon-sort-by-alphabet-alt" ng-show="sort.descending"></i>
            <i class="glyphicon glyphicon-sort-by-alphabet" ng-show="!sort.descending"></i>
          </th>
        </tr>
      </thead>
      <tbody>
        <tr ng-repeat="item in data | orderBy:sort.column:sort.descending">
          <!-- .$orderBy(sort.column, sort.descending) -->
          <td>{{item.id}}</td>
          <td>{{item.date}}</td>
        </tr>
      </tbody>
    </table>
  </div>
</body>

</html>

var app = angular.module('tablePlunker', []).
controller('GridController', function($scope) {
  $scope.data = [{
        id: "e593fbe0-e5bb-40ac-9df9-b6dc2c86fbce",
        date: "Mar 24, 2014 2:41:49 PM"
    }, {
        id: "test-v13",
        date: "Mar 26, 2014 4:26:03 PM"
    }, {
        id: "atfd",
        date: "Mar 25, 2014 11:34:39 AM"
    }];
    
    $scope.sort = {
        column: '',
        descending: false
    };    
    
    $scope.changeSorting = function(column) {

        var sort = $scope.sort;

        if (sort.column == column) {
            sort.descending = !sort.descending;
        } else {
            sort.column = column;
            sort.descending = false;
        }
    };
        
    $scope.selectedCls = function(column) {
        return column == scope.sort.column && 'sort-' + scope.sort.descending;
    };
});

/* Styles go here */
.sort-true {
     background:no-repeat right center url(data:image/gif;base64,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%3D%3D);
}
.sort-false {
    background:no-repeat right center url(data:image/gif;base64,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%3D%3D);
}