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<!DOCTYPE html>
<html>
    <head>
      <meta charset="utf-8">
      <title>JS Bin</title>
    </head>
    
    <body
        ng:app="app"
        ng:init="messages = [
            'message 1',
            'message 2',
            'message 3',
            'message 4',
            'message 5'
        ]"
    >
        <stats></stats>
        
        <h3>Without ng:repeat</h3>
        <p>Use the toggle  below on and off multiple times and pay attention to the number of active scopes and watches being used.</p>
        <toggle>
            <li>{{ messages[0] }}</li>
            <li>{{ messages[1] }}</li>
            <li>{{ messages[2] }}</li>
            <li>{{ messages[3] }}</li>
            <li>{{ messages[4] }}</li>
        </toggle>
​
        <h3>With ng:repeat</h3>
        <p>Now, do the same with the following toggle. This one uses more scopes and watches as it uses ng:repeat.</p>
        <p>Next, uncomment the jquery script tag in the html and try that again... There is a memory leak as it looks like the scopes and watches are not being destroyed, not sure why it happens only with jquery being loaded though...</p>
        <toggle>
            <li ng:repeat="message in messages">{{ message }}</li>
        </toggle>
        
        
        <h1>Bug summary</h1>
        <p>So the bug seems to be only present in the case where an ng:repeat list of elements is being transcluded inside something else, <em>AND</em> jquery is used instead of jqlite.</p>
​
<!--        <script src="https://code.jquery.com/jquery-2.1.1.min.js"></script> -->
<!--        <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.2 -->4/angular.min.js"></script>
  <script src="https://code.angularjs.org/snapshot/angular.js"></script>
    </body>
    
</html>
 
h3 {
    margin: 0;
    margin-bottom: 0.5em;
}
​
.toggle {
    padding: 0.5em;
    margin-bottom: 2em;
    border: 1px solid grey;
}
​
.stats {
    border: 1px solid red;
    margin-bottom: 2em;
    padding: 0.5em;
}
 
angular
    .module('app', [])
        .directive('stats', statsDirective)
        .directive('toggle', toggleDirective);
​
​
​
function toggleDirective() {
    return {
        restrict: 'E',
        replace: true,
        transclude: true,
        scope: {},
        template: '<section class="toggle"><button ng:click="t = !t">toggle</button><div ng:if="t"><div ng:transclude></div></div></section>'
    };
}
​
​
​
​
​
​
​
​
​
​
function statsDirective($rootScope) {
    return {
        restrict: 'E',
        template: '<div class="stats"><h3>Stats</h3><ul"><li>Scopes: {{ getScopeCount() }}</li><li>Watches: {{ getWatchCount() }}</ul></div>',
        replace: true,
        scope: {},
        link: function(scope, elem, attrs) {
            
            scope.getScopeCount = function() {
                return _getAllScopes().length;
            };
​
            scope.getWatchCount = function() {
                return _getAllScopes().reduce(function(watchCount, scope) {
                    if (!scope.$$watchers) { return watchCount; }
                    return watchCount + scope.$$watchers.length;
                }, 0);
            };
​
​
            function _getAllScopes() {
                return [
                    $rootScope
                ].concat(
                    _getChildScopes($rootScope)
                ).filter(function(childScope) {
                    return (childScope !== scope);
                });
​
                function _getChildScopes(scope) {
                    var children = [];
                    if (!scope.$$childHead) { return children; }
                    var childScope = scope.$$childHead;
                    do {
                        children.push(childScope);
                        children = children.concat(_getChildScopes(childScope));
                    } while ((childScope = childScope.$$nextSibling));
                    return children;
                }
            }
        }
    };
}
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