public function actionIndex()
{
$this->layout = "login";
$model = new LoginForm();
$model->setScenario('Existing');
// collect user input data
if (isset($_POST['LoginForm'])) {
$model->attributes = $_POST['LoginForm'];
// validate user input and redirect to the previous page if valid
if ($model->validate() && $model->loginadmin()) {
$this->redirect($this->createAbsoluteUrl("/admin/default"));
} else {
$model->addError('password', Yii::t('global', 'Invalid username or password.'));
}
}
// display the login form
$this->render('index', array('model' => $model));
}