Angular & unload (with issue)

by Julien Roche

HTML

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.9/angular.js"></script>
<body>
  <h1>Unload event management</h1>
  <my-directive></my-directive>
</body>

CSS

my-directive {
  background-color: yellow;
  border: 1px solid black;
  color: black;
  display: inline-block;
  height: 35px;
  line-height: 35px;
  text-align: center;
  width: 300px;
}

JavaScript

window.onbeforeunload = function(event) {
    console.log('Before unload global');
    return 'Date will be lost: are you sure?';
}

angular
	.module('myApp', [])
  .directive('myDirective', function () {
  	return {
    	'restrict': 'E',
      'template': '<button ng-click="vm.reload()">Reload page</button>',
      'scope': { },
      'controller': function () {
      	this.reload = function () {
        	location.reload();
        };
      },
      'controllerAs': 'vm',
      'bindToController': true,
      'link': function ($scope) {
        function beforeUnloadListener() {
          window.removeEventListener('beforeunload', beforeUnloadListener, false);
					console.log('Before unload from directive');
        }

        window.addEventListener('beforeunload', beforeUnloadListener, false);

        $scope.$on('$destroy', function () {
          window.removeEventListener('beforeunload', beforeUnloadListener, false);
        });
      }
    };
  });
  
  angular.bootstrap(document.body, ['myApp']);