var app = angular.module('plunker', []);
app.controller('MainCtrl', function($scope) {
$scope.name = 'World';
});
<!DOCTYPE html>
<html ng-app="plunker">
<head>
<meta charset="utf-8" />
<title>AngularJS Plunker</title>
<script>
document.write('<base href="' + document.location + '" />');
</script>
<link rel="stylesheet" href="style.css" />
<script data-require="angular.js@1.5.x" src="https://code.angularjs.org/1.5.8/angular.js" data-semver="1.5.8"></script>
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl">
<div>
<form name="formDemo" class="form-horizontal" novalidate>
<div class="form-group" ng-class="[{'has-error':formDemo.$submitted && formDemo.formName.$invalid}]">
<label for="formName" class="control-label">Name</label>
<input type="text" class="form-control col-sm-10" name="formName" id="formName" required>
<!--<input type="text" class="form-control col-sm-10" ng-model="name" name="formName" id="formName" required>-->
</div>
<div class="form-group">
<label for="formAge">Age</label>
<input type="number" class="form-control" name="formAge" id="formAge" required>
<!--<input type="number" class="form-control" ng-model="age" name="formAge" id="formAge" required>-->
</div>
<div class="form-group">
<input type="submit" ng-click="Submit()" class="form-control btn btn-primary">
</div>
</form>
</div>
<div ng-class="[{'text-danger':formDemo.$invalid}]">
<h4>Form Details</h4> Form Valid : {{formDemo.$valid}}
<br> Form Invalid: {{formDemo.$invalid}}
<br> Form Dirty: {{formDemo.$dirty}}
<br> Form Submitted: {{formDemo.$submitted}}
<br> Name Invalid: {{formDemo.formName.$invalid}}
</div>
</body>
</html>
/* Put your css in here */