Angularjs 爱奥尼亚-需要电子邮件/密码

我有身份验证我的登录时，错误的电子邮件格式，电子邮件或密码，它将显示一个弹出错误。然而，若并没有在电子邮件和密码中输入任何内容，它将卡在加载页面上。有人有办法吗

login.html

<ion-view title="Login" hide-nav-bar="true" hide-back-button="true" id="page6">    
<ion-content padding="true" style="background: url(img/fOM24l77SrSIyzBwqvMz_login.jpg) no-repeat center;background-size:cover;" class="manual-ios-statusbar-padding">

<div class="spacer" style="width: 300px; height: 82px;"></div>
<h4 style="color: #FFFFFF;" align="center">Login with your NYP SIT account</h4>

    <form name="loginForm" class="list " id="login-form1">
            <ion-list class=" " id="login-list2">

                <div class="app-icon"></div>

                <label class="item item-input item-floating-label">
                    <span class="input-label" style="color: #9F9F9F;">Email</span>
                    <input ng-model="user.email" style="color: white;" type="email" placeholder="Email">
                </label>
                <label class="item item-input item-floating-label">
                    <span class="input-label" style="color: #9F9F9F;" >Password</span>
                    <input ng-model="user.password" style="color: white;" type="password" placeholder="Password">
                </label>

            </ion-list>

            <div style="height: 40px;" class="spacer"></div>
            <button ng-click="loginEmail(loginForm,user)" class=" button button-assertive  button-block  icon-left ion-ios-email-outline "  id="signup-button3">LOGIN WITH EMAIL</button>
        </form>

  </ion-content>
</ion-view>

---

})

我认为最好检查字段是否为空。如果字段为空，则可以显示错误消息

$scope.loginEmail = function(formName, cred) {

    if (formName && cred) { //checking for null
        if (formName.$valid) { // Check if the form data is valid or not

            sharedUtils.showLoading(); //starts the loading popup

            //Email Login via Firebase
            firebase.auth().signInWithEmailAndPassword(cred.email, cred.password).then(function(result) {

                    $ionicHistory.nextViewOptions({
                        historyRoot: true //1
                    });
                    $rootScope.extras = true; //2
                    sharedUtils.hideLoading(); //3
                    $state.go('tabs.home', {}, {
                        location: "replace"
                    }); //4

                },
                function(error) {
                    sharedUtils.hideLoading();
                    sharedUtils.showAlert("ERROR!", "Authentication Error");
                }
            );

        } else {
            sharedUtils.showAlert("ERROR!", "Enter in email format");
        }
    } else {
        sharedUtils.showAlert("ERROR!", "Fields cannot be empty");
    }


};

$scope.loginEmail = function(formName, cred) {

    if (formName && cred) { //checking for null
        if (formName.$valid) { // Check if the form data is valid or not

            sharedUtils.showLoading(); //starts the loading popup

            //Email Login via Firebase
            firebase.auth().signInWithEmailAndPassword(cred.email, cred.password).then(function(result) {

                    $ionicHistory.nextViewOptions({
                        historyRoot: true //1
                    });
                    $rootScope.extras = true; //2
                    sharedUtils.hideLoading(); //3
                    $state.go('tabs.home', {}, {
                        location: "replace"
                    }); //4

                },
                function(error) {
                    sharedUtils.hideLoading();
                    sharedUtils.showAlert("ERROR!", "Authentication Error");
                }
            );

        } else {
            sharedUtils.showAlert("ERROR!", "Enter in email format");
        }
    } else {
        sharedUtils.showAlert("ERROR!", "Fields cannot be empty");
    }


};