Disable jQuery Button with AngularJS and Form Validation - jquery-ui

Question

I would like to disable my jQuery button based on form validation. According to the docs this is fairly easy with regular buttons using syntax such as:
<button ng-click="save(user)" ng-disabled="form.$invalid">Save</button>
However, when changing to a jQuery UI button this no longer works. I assume that Angular has no real binding between jQuery UI and AngularJS and thus would require a directive to do the following:
$("button" ).button( "option", "disabled" );
Is that the case or are there other alternatives? A jsFiddle of what I'm trying to do is here: http://jsfiddle.net/blakewell/vbMnN/.
My code looks like this:
View
<div ng-app ng-controller="MyCtrl">
<form name="form" novalidate class="my-form">
Name: <input type="text" ng-model="user.name" required /><br/>
Email: <input type="text" ng-model="user.email" required/><br/>
<button ng-click="save(user)" ng-disabled="form.$invalid">Save</button>
</form>
</div>
Controller
function MyCtrl($scope) {
$scope.save = function (user) {
console.log(user.name);
};
$scope.user = {};
};
$(function () {
$("button").button();
});

Answer 1

Well the thing is with angular, you're supposed to be making directives to apply your JQuery plugins.
So here you could to this:
//NOTE: directives default to be attribute based.
app.directive('jqButton', {
link: function(scope, elem, attr) {
//set up your button.
elem.button();
//watch whatever is passed into the jq-button-disabled attribute
// and use that value to toggle the disabled status.
scope.$watch(attr.jqButtonDisabled, function(value) {
$("button" ).button( "option", "disabled", value );
});
}
});
and then in markup
<button jq-button jq-button-disabled="myForm.$invalid" ng-click="doWhatever()">My Button</button>

Answer 2

This worked for me:
app.directive('jqButton', function() {
return function(scope, element, attrs) {
element.button();
scope.$watch(attrs.jqButtonDisabled, function(value) {
element.button("option", "disabled", value);
});
};
});
With this markup:
<input type="button" value="Button" jq-button jq-button-disabled="myForm.$invalid" />