How to create a login page with validation using angular js?

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In this blog, we illustrate how to create a login page with some validation using angular js.

To validate a login form data we can use the following to trace the error:

1. $dirty:- It is used to check whether the value has been changed or not.
2. $invalid:- It is used to check whether the input value is invalid or not.
3. $error:- It is used to obtain the error.

A sample program Illustrate how to create a how to create a login page with some validation using angular js.

<html>
     <head>
              <title> Login Page for User</title>
             <script src="~/Scripts/angular.js"></script>
     </head>
   <body>
          <h2>LoginPage</h2>
        <br />
<div ng-app="mainApp" ng-controller = "studentController">
    <form name="studentForm">
        <label>UserName:</label>
        <input type="text" ng-model="firstName" name = "firstName" ng-minlength="6" ng-maxlength="10" required >
            <span style="color:red" ng-show="studentForm.firstName.$error.minlength">Username is too short.</span>
        <span style="color:red" ng-show="studentForm.firstName.$error.maxlength">Username is too long.</span>
        <br />
        <br />
        <br />
        <label>Password:</label>
        <input type="password" ng-model="password" name="password" minlength="6" required>
        <span style="color:red" ng-show="studentForm.password.$error.minlength">Username is too short.</span>
        <br />
        <br />
        <br />
        <label>Email Id: </label>
        <input type="email" ng-model="email" name="email" required>
        <span style="color:red" ng-show="studentForm.email.$touched && studentForm.email.$invalid">Email Id is not valid.</span>
        <br />
        <br />
        <br />
        <button ng-disabled="studentForm.firstname.$dirty && studentForm.firstname.$invalid || studentForm.password.$dirty && studentForm.password.$invalid " ng-click="submit()">Submit</button>
        <button ng-click="reset()" ng-disabled="studentForm.firstname.$invalid">Reset</button>
    </form>
</div>

<script>
    var mainApp = angular.module("mainApp", []);
         mainApp.controller('studentController', function($scope) {
            $scope.reset = function(){
                $scope.firstName = "",
                $scope.password = "",
                $scope.email = ""
            }
            $scope.reset();
         });
</script>
 </body>
</html>

Output:
1. When all the input fields are empty.