AngularJS Example
by sunnycpp
HTML
<div ng-app="">
<form name="myForm" ng-controller="Ctrl" ng-submit="submit()">
userType: <input name="input" ng-model="userType" required>
<span class="error" ng-show="myForm.input.$error.required">Required!</span><br>
<tt>userType = {{userType}}</tt><br>
<tt>myForm.input.$valid = {{myForm.input.$valid}}</tt><br>
<tt>myForm.input.$error = {{myForm.input.$error}}</tt><br>
<tt>myForm.$valid = {{myForm.$valid}}</tt><br>
<tt>myForm.$error.required = {{!!myForm.$error.required}}</tt><br>
</form>
</div>
CSS
</style> <!-- Ugly Hack due to jsFiddle issue: http://goo.gl/BUfGZ -->
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js"></script>
<script src="http://underscorejs.org/underscore-min.js"></script>
<style>
.ng-invalid { border: 1px solid red; }
JavaScript
function Ctrl($scope,$window) {
$scope.userType = 'guest';
$scope.submit = _.bind(alert,$window, "onSubmit");
}