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[AngularJS] Using Services in Angular Directives

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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/

[AngularJS] Using Services in Angular Directives

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