Angular-UI Bootstrap提供了许多组件，从流行的的Bootstrap项目移植到Angular 指令（显著的减少了代码量）。如果你计划在Angular应用中使用Bootstrap组件，我建议细心检查。话虽如此，直接使用Bootstrap，应该也是可以工作的。

Angular controller可以共享service的代码。警报就是把service代码共享到controller的很好用例之一。

Angular-UI Bootstrap文档提供了下面的例子：

view

<div ng-controller="AlertDemoCtrl">
 <alert ng-repeat="alert in alerts" type="alert.type" close="closeAlert($index)">{{alert.msg}}</alert>
 <button class='btn' ng-click="addAlert()">Add Alert</button>
</div>

controller

function AlertDemoCtrl($scope) {
 $scope.alerts = [
 { type: 'error', msg: 'Oh snap! Change a few things up and try submitting again.' }, 
 { type: 'success', msg: 'Well done! You successfully read this important alert message.' }
 ];
 $scope.addAlert = function() {
 $scope.alerts.push({msg: "Another alert!"});
 };
 $scope.closeAlert = function(index) {
 $scope.alerts.splice(index, 1);
 };
}

鉴于我们要在app中的不同的控制器中创建警报，并且跨控制器的代码不好引用，我们将要把它移到service中。

alertService

'use strict';
/* services.js */
// don't forget to declare this service module as a dependency in your main app constructor!
var appServices = angular.module('appApp.services', []);
appServices.factory('alertService', function($rootScope) {
 var alertService = {};
 // create an array of alerts available globally
 $rootScope.alerts = [];
 alertService.add = function(type, msg) {
 $rootScope.alerts.push({'type': type, 'msg': msg});
 };
 alertService.closeAlert = function(index) {
 $rootScope.alerts.splice(index, 1);
 };
 return alertService;
 });

view

<div>
 <alert ng-repeat="alert in alerts" type="alert.type" close="closeAlert($index)">{{ alert.msg }}</alert>
</div>

最后，我们需要将alertService’s中的closeAlert()方法绑定到$globalScope。

controller

function RootCtrl($rootScope, $location, alertService) {
 $rootScope.changeView = function(view) {
 $location.path(view);
 }
 // root binding for alertService
 $rootScope.closeAlert = alertService.closeAlert; 
}
RootCtrl.$inject = ['$scope', '$location', 'alertService'];

我不完全赞同这种全局绑定，我希望的是直接从警报指令中的close data属性中调用service方法，我不清楚为什么不这样来实现。

现在创建一个警报只需要从你的任何一个控制器中调用alertService.add()方法。

function ArbitraryCtrl($scope, alertService) {
 alertService.add("warning", "This is a warning.");
 alertService.add("error", "This is an error!");
}