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.

Angular vs React Tutorial Video

AngularJS Validation 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.


e.g.

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

Output
o18
If you remove the name of id from the text box it shows following output:
o19

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