<button class="button button-dark" ng-click="showAlert()">Sample Alert</button>

.controller('PopupCtrl', function($scope, $timeout, $q, $ionicPopup) {
    $scope.showAlert = function() {
        var alertPopup = $ionicPopup.alert({
            title: 'Don't eat that!',
            template: 'It might taste good'
        });
        alertPopup.then(function(res) {
           console.log('Thank you for not eating my delicious ice cream cone');
        });
    };
})

Error: $ionicPopup is not defined
$scope.showAlert@http://localhost:8100/js/controllers.js:20:13
$parseFunctionCall@http://localhost:8100/lib/ionic/js/ionic.bundle.js:21044:15
@http://localhost:8100/lib/ionic/js/ionic.bundle.js:53458:9
$RootScopeProvider/this.$get</Scope.prototype.$eval@http://localhost:8100/lib/ionic/js/ionic.bundle.js:23100:16
$RootScopeProvider/this.$get</Scope.prototype.$apply@http://localhost:8100/lib/ionic/js/ionic.bundle.js:23199:18
@http://localhost:8100/lib/ionic/js/ionic.bundle.js:53457:7
createEventHandler/eventHandler@http://localhost:8100/lib/ionic/js/ionic.bundle.js:11713:9
triggerMouseEvent@http://localhost:8100/lib/ionic/js/ionic.bundle.js:2863:3
tapClick@http://localhost:8100/lib/ionic/js/ionic.bundle.js:2852:3
tapMouseUp@http://localhost:8100/lib/ionic/js/ionic.bundle.js:2925:5


return logFn.apply(console, args);

<link href="css/ionic.app.css" rel="stylesheet">
<script src="lib/ionic/js/ionic.bundle.js"></script>
<script src="cordova.js"></script>

.controller('PopupCtrl', popupCtrl);

popupCtrl.$inject = ['$scope', '$timeout', '$q', '$ionicPopup'];

var popupCtrl = function($scope, $timeout, $q, $ionicPopup) {
    $scope.showAlert = function() {
        var alertPopup = $ionicPopup.alert({
            title: 'Don't eat that!',
            template: 'It might taste good'
        });
        alertPopup.then(function(res) {
           console.log('Thank you for not eating my delicious ice cream cone');
        });
    };
}

.controller('PopupCtrl', ['$scope', '$timeout', '$q', '$ionicPopup', function($scope, $timeout, $q, $ionicPopup) {
    $scope.showAlert = function() {
        var alertPopup = $ionicPopup.alert({
            title: 'Don't eat that!',
            template: 'It might taste good'
        });
        alertPopup.then(function(res) {
           console.log('Thank you for not eating my delicious ice cream cone');
        });
    };
}])

angular.module('surveyApp', ['ionic'])