AngularJS Form Validation - Disable Submit / Confirm Password Custom Directive

Creates a "UserValidation" module with validation directive to make sure passwords match. http://thomporter.com

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-combined.min.css">
<div ng-app="myapp">
   <form name="myForm">
   <label for="email">Use</label>
   <input type="number" id="useQty" name="useQty" ng-model="formData.useQty" required/>
     <label for="email">Min
     
     </label>
       <span ng-show="!myForm.username.$error.required && (myForm.username.$error.minlength || myForm.username.$error.maxlength) && myForm.username.$dirty">Username ust be between 5 and 20 characters.</span>
       <br />
       
     
   <input type="number" id="minQty" name="useQty" min="formData.useQty" ng-model="formData.minQty" required/>
     <label for="email">Max</label>
   <input type="number" id="useQty" name="useQty" max="formData.useQty" ng-model="formData.minQty" required/>
   
   <label for="email">Email</label>
   <input type="email" id="email" name="email" ng-model="formData.email" required/>
   <span ng-show="myForm.email.$error.required && myForm.email.$dirty">required</span>
   <span ng-show="!myForm.email.$error.required && myForm.email.$error.email && myForm.email.$dirty">invalid email</span>
       <br />
   <label for="email">Name</label>
   <input type="text" id="name" name="name" ng-model="formData.name" required/>
   <span ng-show="myForm.name.$error.required && myForm.name.$dirty">required</span>
       <br />
       <label for="username">Username</label>
       <input type="text" id="username" name="username" ng-model="formData.username" ng-minlength="5" ng-maxlength="20" ng-pattern="/^[A-z][A-z0-9]*$/" required  />
   <span ng-show="myForm.username.$error.required && myForm.username.$dirty">required</span>
   <span ng-show="!myForm.username.$error.minLength && !myForm.username.$error.maxLength && myForm.username.$error.pattern && myForm.username.$dirty">Must start with a letter, and contain letters &amp; numbers only.</span>
   <span ng-show="!myForm.username.$error.required &&...

JavaScript

var app = angular.module('myapp', ['UserValidation']);

angular.module('UserValidation', []).directive('validPasswordC', function () {
    return {
        require: 'ngModel',
        link: function (scope, elm, attrs, ctrl) {
            ctrl.$parsers.unshift(function (viewValue, $scope) {
                var noMatch = viewValue != scope.myForm.password.$viewValue
                ctrl.$setValidity('noMatch', !noMatch)
            })
        }
    }
})