app/views/login.html
<form class="form-signin" role="form">
<div ng-if="message" class="alert-warning">
{{message}}
</div>
<input type="text" class="form-control" placeholder="username" ng-model="user.username" required autofocus>
<input type="password" class="form-control" placeholder="Password" ng-model="user.password" required>
<button class="btn btn-lg btn-primary btn-block" ng-click="login(user.username, user.password)">login</button>
</form>