Directives have dependencies too, and you can use dependency injection to provide services for your directives to use.

Bad: If you want to use <alert> in another controller or page, you have to modify the AlertService. This might break things.

<!DOCTYPE html>

<html>

<head>

    <title>Egghead.io Tutorials</title>

    <link rel="shortcut icon" href="favicon.ico">

    <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="stylesheet">

    <script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.3/angular.js"></script>

    <script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.2.11/angular-ui-router.js"></script>

    <script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.12.0/ui-bootstrap.js"></script>

    <script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.12.0/ui-bootstrap-tpls.js"></script>

    <script src="app.js"></script>

</head>

<body ng-app="app" ng-controller="MainCtrl as main">

    <alert type="{{main.AlertService.alertType}}" ng-if="main.AlertService.isShowAlert">{{main.AlertService.alertMessage}}</alert>

    <button ng-click="main.showAlert();">Something Failed</button>

</body>

</html>
angular.module("app", ["ui.bootstrap"])

    .controller('MainCtrl', function MainCtrl(AlertService) {

        var mainCtrl = this;

        mainCtrl.AlertService = AlertService;

    })

    .service('AlertService', function AlertService() {

        var AlertService = {};

        AlertService.false = true;

        AlertService.showAlert = function() {

            AlertService.alertType="success";

            AlertService.alertMessage = "There is a message";

            AlertService.isShowAlert = true;

        }

        return AlertService;

    });

Good: Using Directive injected by the service. Then the <alert> is no longer bind with the controller anymore.

<!DOCTYPE html>

<html>

<head>

    <title>Egghead.io Tutorials</title>

    <link rel="shortcut icon" href="favicon.ico">

    <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="stylesheet">

    <script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.3/angular.js"></script>

    <script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.2.11/angular-ui-router.js"></script>

    <script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.12.0/ui-bootstrap.js"></script>

    <script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.12.0/ui-bootstrap-tpls.js"></script>

    <script src="app.js"></script>

</head>

<body ng-app="app" ng-controller="MainCtrl as main">

    <alert-message></alert-message>

    <!--<alert type="{{main.AlertService.alertType}}" ng-if="main.AlertService.isShowAlert">{{main.AlertService.alertMessage}}</alert>-->

    <button ng-click="main.showAlert();">Something Failed</button>

</body>

</html>
angular.module("app", ["ui.bootstrap"])

    .service('AlertService', function AlertService() {

        var AlertService = {};

        AlertService.false = true;

        AlertService.showAlert = function() {

            AlertService.alertType="success";

            AlertService.alertMessage = "There is a message";

            AlertService.isShowAlert = true;

        }

        return AlertService;

    })

    .directive('alertMessage', function() {

        return {

            bindToController: true,

            controller: 'AlertCtrl',

            controllerAs: 'alertCtrl',

            template: '<alert type="{{alertCtrl.AlertService.alertType}}" ng-if="alertCtrl.AlertService.isShowAlert">{{alertCtrl.AlertService.alertMessage}}</alert>'

        }

    })

    .controller('AlertCtrl', function(AlertService) {

        var alertCtrl = this;

        alertCtrl.AlertService = AlertService;

    })

    .controller('MainCtrl', function(AlertService) {

        var main = this;

        main.AlertService = AlertService;

        main.showAlert = function() {

            main.AlertService.isShowAlert = true;

            main.AlertService.alertType="danger";

            main.AlertService.alertMessage = "Something wrong happened";

        }

    });

anuglar-ui-bootstrap:

http://angular-ui.github.io/bootstrap/

bindToController:

http://flipjs.io/2014/09/09/isolate-scope-controller-as/

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