Wijmo 5 - Merging rows

HTML

<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<script src="http://cdn.wijmo.com/5.20143.24/controls/wijmo.min.js"></script>
<link rel="stylesheet" href="http://cdn.wijmo.com/5.20143.24/styles/wijmo.min.css">
<script src="http://cdn.wijmo.com/5.20143.24/controls/wijmo.grid.min.js"></script>
<script src="http://cdn.wijmo.com/5.20143.24/controls/wijmo.chart.min.js"></script>
<script src="http://cdn.wijmo.com/5.20143.24/interop/angular/wijmo.angular.min.js"></script>
<!-- mark this as an Angular application and give it a controller -->
<div ng-app="app" ng-controller="appCtrl">
    
<h1>Merging Rows</h1>

    <wj-flex-grid items-source="data" initialized="init(s,e)">
    </wj-flex-grid>
</div>

JavaScript

// define app, include Wijmo 5 directives
var app = angular.module('app', ['wj']);

// controller
app.controller('appCtrl', function ($scope) {

    // create some random data
    var countries = 'US,Germany,UK,Japan,Italy,Greece'.split(','),
        data = [];
    for (var i = 0; i < 100; i++) {
        data.push({
            country: countries[i % countries.length],
            country2: countries[i % 3],
            downloads: Math.round(Math.random() * 20000),
            sales: Math.random() * 10000,
            expenses: Math.random() * 5000
        });
    }

    // expose data as a CollectionView to get events
    $scope.data = new wijmo.collections.CollectionView(data);
    
    // merge cells across rows
    $scope.init = function(s, e) {
        s.allowMerging = wijmo.grid.AllowMerging.Cells;
        mergeRows(s);
        s.collectionView.collectionChanged.addHandler(function () {
            mergeRows(s);
        });
    }
    function mergeRows(flex) {
        for (var i = 0; i < flex.rows.length; i++) {
            flex.rows[i].allowMerging = true;
        }
    }
});