index.html

<!doctype html>
<html lang="en" ng-app="far_login">
<head>
  <meta charset="utf-8">
  <title>Angular test</title>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.0/angular.min.js"></script>

</head>
<body>
<div ng-controller="far_formcontrol">
  <form name = "sform" novalidate="true">
<table border="0">
    <tr>
        <td>
            First name:
        </td>
        <td>
            <input type="text" name="fname" ng-model="fname" placeholder="First Name" required="true" ng-pattern="/^[A-Za-z]*$/">
        </td>
        <td ng-show="sform.fname.$invalid && !sform.fname.$pristine"  class="help-block">wrong name </td>
    </tr>

    <tr>
        <td>
            Last Name:
        </td>
        <td>
            <input type="text" ng-model="lname" placeholder="last Name" required="true" ng-pattern="/^[A-Za-z]*$/">
        </td>
        <td ng-show= "sform.lname.$invalid && !sform.lname.$pristine"  class="help-block">wrong Last name </td>
    </tr>
    <tr>
        <td>
            Email:
        </td>
        <td>
            <input type="email" ng-model="email" placeholder="email" required="true">
        </td>
        <td ng-show="sform.email.$invalid && !sform.email.$pristine"  class="help-block">wrong Email </td>
    </tr>
    <tr>
        <td>
            <button type="submit" ng-disabled="sform.$invalid" ng-click = "submitForm()">Submit</button>
        </td>
    </tr>
</table>
</form>
</div>
<script src="far_app.js"></script>
</body>

</html>