What is AngularJS Validation?

Forms and controls in AngularJS give validation services and inform users of invalid input. AngularJS provides us different information about a form or its inputs and are applied to a form and inputs.
To track error following terms are used:

  • $dirty− states that value has been altered.
  • $error− states the exact error.
  • $invalid− states that value entered is invalid.

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<!DOCTYPE html>
<script src= "http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
<h1>Example of Validation</h1>
<form ng-app="myApp" ng-controller="validateCtrl"
name="intellipaatForm" novalidate>
<input type="text" name="username" ng-model="username" required>
<span style="color:red" ng-show="intellipaatForm.username.$dirty && intellipaatForm.username.$invalid">
<span ng-show="intellipaatForm.username.$error.required">Username is required.</span>
<input type="email" name="email" ng-model="email" required>
<span style="color:red" ng-show="intellipaatForm.email.$dirty && intellipaatForm.email.$invalid">
<span ng-show="intellipaatForm.email.$error.required">Email is required.</span>
<span ng-show="intellipaatForm.email.$error.email">Invalid email address.</span>
<input type="submit"
ng-disabled="intellipaatForm.username.$dirty && intellipaatForm.username.$invalid ||
intellipaatForm.email.$dirty && intellipaatForm.email.$invalid">
var app = angular.module('myApp', []);
app.controller('validateCtrl', function($scope) {
$scope.username = 'abc';
$scope.email = '[email protected]';


If you remove the name of the id from the text box it shows the following output:

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