AngularJS Form Validation and Submit - angularjs

Question

Codepen link: http://codepen.io/anon/pen/mVyPaw
Need to create an angular app (w/ 1 controller) that validates that this form has all three fields filled out & Submit button can only be enabled if the form is valid. Don't need to use the preprocessors.
<div class="container" ng-app="myApp" ng-controller="formCtrl">
<h1><span><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/15309/angular-logo.svg" alt="Angular.js Logo" /></span> Angular.js - Web Form</h1>
<form role="form" name="form" id="contact-form">
<div class="form-group">
<label for="FirstName">First name</label>
<input type="text" class="form-control" name="FirstName" id="FirstName" placeholder="enter first name" ng-model="firstName">
</div>
<div class="form-group">
<label for="LastName">Last Name</label>
<input type="text" class="form-control" name="LastName" id="LastName" placeholder="enter last name" ng-model="lastName">
</div>
<div class="form-group">
<label for="EmailAddress">Email address</label>
<input type="email" class="form-control" id="EmailAddress" name="EmailAddress" placeholder="enter email" ng-model="emailAddress" ng-model-options="{ updateOn: 'blur' }">
</div>
<div class="checkbox">
<label>
<input type="checkbox" required> Check me out
</label>
</div>
<button type="submit" class="btn btn-default" ng-model="submitButton">Submit</button>
</form>
</div>

Answer 1

Actually it's module inject problem. ng-app="myApp" ng-controller="formCtrl" Where is your myApp module code.
try like this.
<div class="container" ng-app>
<h1><span><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/15309/angular-logo.svg" alt="Angular.js Logo" /></span> Angular.js - Web Form</h1>
<form role="form" name="form" id="contact-form" novalidate>
<div class="form-group">
<label for="FirstName">First name</label>
<input type="text" class="form-control" name="FirstName" id="FirstName" placeholder="enter first name" ng-model="firstName" required>
</div>
<div class="form-group">
<label for="LastName">Last Name</label>
<input type="text" class="form-control" name="LastName" id="LastName" placeholder="enter last name" ng-model="lastName" required>
</div>
<div class="form-group">
<label for="EmailAddress">Email address</label>
<input type="email" class="form-control" id="EmailAddress" name="EmailAddress" placeholder="enter email" ng-model="emailAddress" ng-model-options="{ updateOn: 'blur' }" required>
</div>
<div class="checkbox">
<label>
<input type="checkbox" required> Check me out
</label>
</div>
<button type="submit" class="btn btn-default" ng-disabled="form.$invalid">Submit</button>
</form>
</div>

Answer 2

Add required validation
<div class="container" ng-app="myApp" ng-controller="formCtrl">
<h1><span><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/15309/angular-logo.svg" alt="Angular.js Logo" /></span> Angular.js - Web Form</h1>
<form role="form" name="myForm" id="contact-form">
<div class="form-group">
<label for="FirstName">First name</label>
<input type="text" class="form-control" name="FirstName" id="FirstName" placeholder="enter first name" ng-model="firstName" required>
</div>
<div class="form-group">
<label for="LastName">Last Name</label>
<input type="text" class="form-control" name="LastName" id="LastName" placeholder="enter last name" ng-model="lastName" required >
</div>
<div class="form-group">
<label for="EmailAddress">Email address</label>
<input type="email" class="form-control" id="EmailAddress" name="EmailAddress" placeholder="enter email" ng-model="emailAddress" ng-model-options="{ updateOn: 'blur' }" required>
</div>
<div class="checkbox">
<label>
<input type="checkbox" required> Check me out
</label>
</div>
<button type="submit" class="btn btn-default" ng-model="submitButton" data-ng-disabled="myForm.$invalid" >Submit</button>
</form>
</div>
Here is your edited CodePen