Делегирование событий в AngularJS. Попытка разобраться

html
<ul bn-delegate="li a | selectFriend( friend )">
 
        <li ng-repeat="friend in friends">
 
            <!-- Delegate target. -->
            <a href="#">{{ friend.name }}</a>
            <!-- Delegate target. -->
 
        </li>
 
    </ul>

//js
                    element.on(
                        "click.bnDelegate",
                        selector,
                        function( event ) {
 
                            // Prevent the default behavior - this is
                            // not a "real" link.
                            event.preventDefault();
 
                            // Find the scope most local to the target
                            // of the click event.
                            var localScope = $( event.target ).scope();
 
                            // Invoke the expression in the local scope
                            // context to make sure we adhere to the
                            // proper scope chain prototypal inheritance.
                            localScope.$apply(
                                function() {
 
                                    expressionHandler( localScope );
 
                                }
                            );
 
                        }
                    );