angularjs checkbox onchange not working in form .$pristine

Issue

I have a form in angular and having some input boxes, checkbox and a submit button.Initially Submit button is Disabled. If I change any element from that form then the submit button become enable. I am making use of angularjs feature .$pristine and $invalid for that. It is working fine for input boxes but not working for checkbox change. Am I doing anything wrong? kindly guide me. See the fiddle :FIDDLE

Solution

You need to add an ng-model for checkbox

<input type="checkbox" ng-model="val" required />

Working Demo:http://jsfiddle.net/7qAqe/12/

"An input control that has the ngModel directive holds an instance of NgModelController. Such a control instance can be published as a property of the form instance using the name attribute on the input control. The name attribute specifies the name of the property on the form instance."
- Forms Documentation

Answered By - Vivz