Dynamically add directives in AngularJS

For a walkthrough see http://blog.fourtonfish.com/post/74055065673/dynamically-add-directives-in-angularjs-no-jquery

HTML

<section ng-app="myApp" ng-controller="MainCtrl">
    <addbuttonsbutton></addbuttonsbutton>
    <div id="space-for-buttons"></div>
</section>

CSS

section {
    padding: 2em;
}
button {
    padding:0.3em;
    margin: 0.3em;
}

JavaScript

var myApp = angular.module('myApp', []);

function MainCtrl($scope) {
    $scope.count = 0;
}

myApp.directive("addbuttonsbutton", function () {
    return {
        restrict: "E",
        template: "<button addbuttons>Click to add buttons</button>"
    }
});

//Directive for adding buttons on click that show an alert on click
myApp.directive("addbuttons", function ($compile) {
    return function (scope, element, attrs) {
        element.bind("click", function () {
            scope.count++;
            angular.element(document.getElementById('space-for-buttons'))
                .append($compile("<alert alert='count'></alert>")(scope));
        });
    };
});

//Directive for showing an alert on click
myApp.directive("alert", function () {
    return {
        template: "<div><button class='btn btn-default'>Show alert # {{count}}</button></div>",
        scope: {
            a: '@alert'
        },
        replace:true,        
        link: function (scope, element, attrs) {
            element.bind("click", function () {
                console.log(scope.a);
                alert("This is alert #" + scope.a);
            });
        }
    };
});